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CewePrometer
User Manual
Ver. 1.0
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Contents
Introduct ion ........................................................................................................................5
About this user manual.................................................................................................5Contacting us................................................................................................................5
Product description ...........................................................................................................6
Sealing of CewePrometer-W........................................................................................9
Sealing of CewePrometer-R.......................................................................................10
Connections................................................................................................................10
Mechanical design......................................................................................................13
Function modules .......................................................................................................16
Measuring principles ..................................................................................................17
Configuration, reading and maintenance ......................................................................18
Connecting to CewePrometer.....................................................................................19
Basic configuration.....................................................................................................20
Overview of functions ................................................................................................22
Changing configuration..............................................................................................24
Working with configurations......................................................................................25
Reading.......................................................................................................................25
Information about the meter .......................................................................................26Versions and version conflicts ...................................................................................27
Updating firmware .....................................................................................................27
Language ....................................................................................................................28
Resetting registers and logs ........................................................................................28
Funct ions..........................................................................................................................29
Meter clock.................................................................................................................29
Energy registers ..........................................................................................................30
Instant values..............................................................................................................31Digital inputs and outputs...........................................................................................33
Display sequences ......................................................................................................36
Communications and security ....................................................................................37
Loggers.......................................................................................................................39
Alarms ........................................................................................................................41
Event log.....................................................................................................................43
Maximum demand......................................................................................................44
Historical registers......................................................................................................45
Time of use.................................................................................................................46
Transformer compensation.........................................................................................48
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Contents
Power quality..............................................................................................................50
Miscellaneous.............................................................................................................52
Using the display .............................................................................................................53
Voltage order display layout ......................................................................................53
Navigating in display sequences ................................................................................54
Display layouts with active choices ...........................................................................54
Using the display for communication diagnostics .....................................................56
Appendix A Display Layouts .......................................................................................57
Appendix B - Events ........................................................................................................61
Appendix C Serial Communicat ion Port RS232/422 ..................................................63
Appendix D - Module block d iagram ..............................................................................65
Appendix E Frequently Asked Questions...................................................................66
Appendix F Calculation Princip les ..............................................................................67
Appendix G Material Declarat ion.................................................................................72
Appendix H Connect ion Data ......................................................................................73
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Introduction
IntroductionThank you for choosing the CewePrometer.
The CewesPrometer is a multi-functional, electronic, electricity energy meter. It provides very high
accuracy in measuring electrical energy and also in measuring instantaneous quantities such as
current, voltage, power, frequency etc. CewePrometers extensive configurable functional features
together with the high accuracy enable application areas more numerous than for traditional electric
meters. Besides having well-designed traditional features such as meter registers, data logging and
tariff capability, there are also extensive functions for monitoring alarm conditions, harmonics,
measuring sags and swells and other power quality quantities.
About this user manualThis user manual describes the CewePrometers functions and provides the information needed to
configure and use the meter. The manual covers all versions of the CewePrometer-R (rack-
mounted) and CewePrometer-W (wall-mounted). Some of the described functional properties can
be missing in certain meter versions. The CewePrometer is complemented with CeweConfig, a PC
program for configuring, manual reading and maintenance.
Contacting us
For more information and technical support, please contact Cewe Instrument.
Internet www.ceweinstrument.se
E-mail technical support [email protected]
E-mail order and product information [email protected]
Telephone +46 (0)155 77500
Address Cewe Instrument AB
Box 1006
SE-611 29 Nykping
Sweden
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Product description
Product description
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Figure 1 CewePrometer-W
53 4
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2 8 11
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Figure 2 CewePrometer-R
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Product description
1 Display
2 Optical communication portThe optical port communicates in accordance with IEC62056-21/IEC1107.
3 Alarm LED
The alarm LED flashes when an alarm state has occurred. For alarms, such as
for high or low voltage, phase balance or similar external errors, the LED stops
flashing when the alarm state has passed. If the meter has had an internal error,
the alarm must be acknowledged and manually reset.
4 Calibration LED for active energy
The LED is the source of the energy signal for accuracy testing of active energy.
The light pulses have a 50% pulse width and a frequency proportional to the
measured active power. A constant that specifies the total number of pulses perkWh can be configured. The same constant applies to active and reactive energy.
5 Auxiliary power LED
When the CewePrometer is receiving auxiliary power, the green LED turns on to
indicate that the meter's power supply is working.
6 Sealing points for terminal coverThe terminal cover can be sealed with lead seals (or comparable seals) and
sealing wire through the sealing points.
7 Terminal cover
8 Sealing points for front panel windowThe front panel exterior window can be sealed with lead seals (or comparable
seals) and sealing wire through the sealing points. The seal prevents access to
the fourth button (sealed button) and the optional backup battery for the real-
time clock.
9 Meter cover
10 Front panel window
The front panel window has hooks for attaching the meter label. In addition, the
window is provided with a pocket for inserting an extra label. The extra label
can be used when transformer ratios are changed.
11 Calibration LED for reactive energy
The LED is the source of the energy signal for accuracy testing of reactive
energy. The light pulses have a 50% pulse width and a frequency proportional to
the measured reactive power. A constant that specifies the total number of pulses
per kvarh can be configured. The same constant applies to active and reactive
energy.
12 Sealed button
The button is hidden under the front panel window and provides access to a fifth
configurable display sequence. Holding down the button for about two seconds
opens a system menu.
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Product description
13 Step backward
The button is used to step backward to a previous display layout in the selected
display sequence, or to step downwards in a menu.
14 Menu/Apply
The Menu/Apply button is used to open the menu where one of four
configurable display sequences can be chosen. The button confirms choices
made or initiates other activities depending on the current display layout.
15 Step forward
The button is used to step forward to the following display layout in the selected
display sequence, or to step upwards in a menu.
16 Sealing points for rack mounting
The rack mounting bracket for the CewePrometer-R can be sealed with lead
seals (or comparable seals) and sealing wire through the sealing points.
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Product description
Sealing of CewePrometer-W
See Figure 1 CewePrometer-Wfor location of the sealing points. The front panel window can besealed with lead seals (or comparable seals) and sealing wire through the sealing points. The seal
prevents access to the fourth sealed button and the optional backup battery for the real-time clock.
Battery cover
Sealed button
Figure 3 Under the front panel window is a fourth button and backup battery for the real-time clock.
The terminal cover can be sealed with lead seals (or comparable seals) and sealing wire through the
sealing points.
The meter cover can be sealed with lead seals (or comparable seals) and sealing wire through the
two sealing points under the terminal cover.
Sealing point
Figure 4 The meter cover can be sealed at the sealing rings on both sides under the terminal cover.
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Product description
Sealing of CewePrometer-R
See Figure 2 CewePrometer-Rfor location of sealing points. The enclosure permits the meter to be
sealed at three points. The top and bottom covers are normally each sealed with a lead seal and with
sealing wire through a sealing screw and a fixed hole on the cover at the rear of the meter. The
exterior window on the meter front can be sealed on a sealing point with a lead seal and sealing
wire. In this way, the meter can be sealed so that it cannot be opened without breaking all the seals.
One of the buttons on the front is protected from access behind the sealed exterior window.
Sealed button
Battery
Under the front panel window is a fourth button and backup battery for the real-time clock.
Connections
Connections to the CewePrometer-W are made on the meter terminal under the terminal cover.
Connections to the CewePrometer-R are made on the rear panel of the meter subrack. The
connections are: measuring voltages, measuring currents, relay outputs, optically isolated digitalinputs, separate auxiliary power and connections to communication modules, if any.
Digital outputs Digital inputs
Output #1 Input #4
Separate aux. power
(Uaux
)
I'L1
UL1
IL1
N
Output #8 Input #1
I'L2
UL2
IL2
I'L3
UL3
IL3
Connections for CewePrometer-W
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Product description
Connections for CewePrometer-R
Digital I/O variants6 outputs, 4 inputs
OUT1 C0, C5 IN1 C4, C9
OUT2 C1, C6 IN2 C3, C8
OUT3 C2, C7 IN3 D4, D9
OUT4 D0, D5 IN4 D3, D8
OUT5 D1, D6
OUT6 D2, D7
10 outputs, 2 inputs
OUT1 C0, C5 IN1 C4, C9
OUT2 C1, C6 IN2 C3, C8
OUT3 C2, C7
OUT4 D0, D5OUT5 D1, D6
OUT6 D2, D7
OUT7 D3, D8
OUT8 D4, D9
OUT9 B7, B8
OUT10 B4, B9
ConnectionsUL1 B1 IL1 A01
UL2 B2 I'L1 A1
UL3 B3 IL2 A02
N B0 I'L2 A2
IL3 A03
Uaux1 B5 I'L3 A3
Uaux2 B6
Current, voltage and auxiliary power connections
for CewePrometer-R.
12 outputs, 0 inputs
OUT1 C0, C5
OUT2 C1, C6
OUT3 C2, C7
OUT4 D0, D5
OUT5 D1, D6
OUT6 D2, D7
OUT7 D3, D8
OUT8 D4, D9
OUT9 B7, B8
OUT10 B4, B9
OUT11 C3, C8
OUT12 C4, C9
Connector for CewePrometer-R
A standardised Entrelec Essailec plug-in connector is used, of the same type as for other meters
according to standard DIN 43862. The cable connection is made in the subrack. The meter is
connected via the contact pins after insertion. The connector has a short-circuit protection featurefor electrical circuits, permitting the meter to be withdrawn and inserted into the subrack during
operation.
Auxi liary power
The CewePrometer is supplied with separate auxiliary power. Auxiliary power can be supplied both
with alternating current and polarity-independent direct current within a specified range. There are
two versions that have either a high or a low auxiliary voltage range.
Digital outputs
The CewePrometer's outputs are solid-state MOS-FET bipolar semiconductor relays, with normally
open contact function. Internal current limit protects the relay from being damaged by excessively
high current.
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Product description
Digital inputs
The optically isolated digital inputs consist of opto couplers, where the LED is powered from an
external voltage signal through series resistance to limit the current. This means that an externalvoltage must be connected between the passive pulse and level transmitter and the opto coupler's
LED, or the transmitter must deliver an active voltage signal to send pulses that are detected by the
optical input. The optically isolated inputs are unaffected by reverse polarity. Both DC and 50/60
Hz AC can be used.
Serial communication ports
The CewePrometer is always equipped with one optical port and is available in versions with or
without additional communication ports. A meter can be equipped with up to two extra ports, either
with the RS232 or RS422 interface.
Communications through the infrared IEC62056-21/IEC1107 optical port are transferredvia an optical read/write adapter, an optical head. The optical head is positioned and
secured over the optical port by a magnet on the head and a steel plate around the opening
of the optical port.
The RS232 standard communication port is used to connect communication equipment
(computers, modems) through a serial cable with a standard D-sub, 9-pin connector.
The RS422 serial communication port is intended to be used to connect the CewePrometer
to a network for multi-drop communications. The CewePrometer is connected to the
communication equipment (RS422 converter) with two twisted-pair wires connected to a
5-pole connector.
For information on pin configuration, see Appendix C Serial Communication Port RS232/422
(pg. 63).
Communication port #2 Communication port #1
Numbering of the communication ports from right to left on the CewePrometer-W.
Communication port #1
Communication port #2
Numbering of the communication ports on the CewePrometer-R
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Product description
Mechanical design
Alternative
mounting
Dimensions for CewePrometer-W.
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Product description
Dimensions for CewePrometer-R.
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Product description
Dimensions for CewePrometer-R subrack.
The subrack is also available in alternative connector versions that will fit other brands of meters
with the same type of connector. Contact Cewe Instrument for more information.
Enclosure and protective earth
CewePrometer-W
The enclosure consists of a meter base, meter cover, terminal cover and a plastic exterior window.
The meter is not connected with protective earth. There is also an optional 19 inch rack/panel
mounting kit available for to CewPrometer-W to be mounted side by side.
CewePrometer-R
Enclosure fits for installation of two meters in a 19" subrack in compliance with DIN438862. The
enclosure consists of a box made of surface-finished steel sheet and a front with a plastic window.The meter is designed for protective earthing through the 19" subrack.
Isolation and personal safety
The electronic circuits are isolated from all connections to the supply mains with transformers.
Digital I/O connections are isolated with opto couplers and solid state relays. The communication
ports are also isolated but for a lower voltage.
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Product description
Function modules
Modulisation
The CewePrometer is made up of function modules. Modulisation is primarily used to make it easy
to produce different versions with the same basic design, and to enable development of new
modules for the basic design to add or replace functions. Modulisation is not primarily intended for
being able to switch plug-in modules in the field the meter must be opened and the seals broken to
switch modules.
Modules
The CewePrometer consists of the following basic modules, which are necessary for a functioning
meter in its simplest version:
Measurement module
Power module
Display and register module
Moreover, the meter is normally equipped with the following modules for additional functionality:
Digital I/O module
Communication module
There is also space for additional function modules for expansion of function properties to meet
future market needs.
For more information, see Appendix D - Module block diagram(pg. 65).
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Product description
Measuring princip les
The measuring circuit in CewePrometer consists of current and voltage transformers that providesignals to six parallel AD converters (analogue to digital converters) that are synchronised by a
common clock signal. The digital signals are thereafter processed by a DSP. Using voltage
transformers makes the electronics in the meter galvanically isolated from the measurement voltage,
which provides good personal safety and protection for connected equipment, such as modems.
Calculation flow
All values are calculated in the CewePrometer based on calibrated current and voltage values.
Current and voltage amplitudes and phase angles are fully compensated in regards to accuracy,
harmonics, frequency and temperature. Adjustments for accuracy are made throughout the dynamic
range for both voltage and current. Based on these individually compensated current and voltage
signals, power, energy, power factor and all other quantities that the CewePrometer can present, aresubsequently calculated. This means that accuracy for instant values is good and that active and
reactive power are correctly calculated, including harmonic power. For more information on
calculation principles and the formulas used, see Appendix F Calculation Principles(pg. 67).
3-element meter
On the 3-element CewePrometer, phase voltages and neutral wires are connected to the meter. The
voltages measured are phase voltages. Power and energy are calculated from three phase voltages
and three currents. Harmonic measurement, alarm monitoring and transformer corrections are made
on phase voltages. The phase to phase voltage is calculated from the phase voltages.
2-element meter
On the 2-element CewePrometer, the neutral conductor is not connected to the meter and the three
voltages are internally D-connected. The voltages measured are subsequently phase to phase
voltages. Power and energy are calculated based on two phase to phase voltages (U12 and U23) and
two currents (I1 and I3) according to the 2-watt meter method. The 2-element meter is primarily
used for D-connected systems (3-wire). Harmonic measurement, alarm monitoring and transformer
corrections are made on phase to phase voltages.
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Configuration, reading and maintenance
Configuration, reading and maintenance
CeweConfig is a PC program that makes all CewePrometer functions available. With CeweConfig,you can:
ConfigureConfiguring means that parameters affecting meter function can be set. Examples of
parameters that can be configured are: transformer ratios, logging interval and limits for
alarms.
Reading
Examples of information that can be read are: registers, logged values, alarms and
harmonics. The information can be printed out or saved to a file.
MaintenanceExamples of maintenance tasks are: resetting the event log and updating the firmware in the
meter.
ToolbarMenu
Configuration formStatus barStructure tree
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Configuration, reading and maintenance
Connecting to CewePrometer
To be able to configure or read values in the CewePrometer, CeweConfig must be connected andhave authorisation to access the meter. The meter has five different authorisation levels that can be
configured with passwords. See the section Communications and security(pg. 37). With the meter's
factory settings, no password is configured, and subsequently no password is necessary when you
connect.
To communicate with a meter, the PC must be physically connected to the CewePrometer in one of
the following ways:
PC Optical head Meter
PC Crossed serial cable (null modem) Meter
PC Straight serial cable RS422 converter Daisy chained meters
PC Modem Modem Meter
How to connect to the meter
1. Connect to Meter
Choose Connect to Meterfrom the Filemenu or by clicking the toolbar button.
2. Communication channel
Click the Settingstab and choose either Optical Port, Serial Portor Modem. If the serial port or a
modem is used, the baud rate must be selected. For meters with factory settings, the baud rate is
9600. When the optical port is used, CeweConfig adapts itself to the baud rate the meter is
configured for, making selection of the baud rate unnecessary.
Note: The selectable communication ports can be changed by changing the XML file Settings.xml
that is in CeweConfig's installation directory.
3. Modem
If a modem connection is used, a modem must be chosen. The modems available are those installed
in Windows. Click the Commontab and enter the telephone number to be called.
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Configuration, reading and maintenance
4. Password
Click the Commontab. A password is entered if one is configured in the meter. With the meter's
factory settings, no password is configured, and subsequently no password is necessary when you
connect.
5. Serial number
Serial number is only required if a special meter is to be addressed when several meters are
connected together with RS422.
6. Trace to file
Under the Settingstab, a box can be checked to activate tracing to a file. A file named
SerialTrace.log is then created in CeweConfig's installation directory. All communications between
CeweConfig and the meter are presented in the file. The function can be used to analyse
communication problems.
7. Click the Connectbutton.
Problems w ith connecting
If the meter cannot be connected, an error message is displayed. Depending on the reason, the
message can suggest corrective actions, such as changing the port or port baud rate.
Tip: When communication problems occur, the trace feature on the meter's display can be used to
see if that which has been sent has been registered by the meter. See the section Using the display
for communication diagnostics(pg. 56).
Basic configuration
Some basic settings may be required before the CewePrometer will be able to measure and operate
correctly in a system.
Note: Settings are only necessary if they have not been made at the factory prior to delivery.
Meters supplied without backup batteries retain the time setting for a maximum of three days. For
time-dependent functions such as logging and event logging to work, the clock may need to be
adjusted.
To change the configuration for a meter, you must be connected to it. Click the Configuration
folder in the structure tree to the left in CeweConfig to display the various functions that can be
configured. For more information see the section Changing configuration(pg. 24).
Tip: You can save a configuration from a meter to a file. A summary of the configuration can also
be printed out. You can also create a configuration without being connected to a meter. For more
information, see Working with configurations(pg. 25).
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Configuration, reading and maintenance
Meter clock:To configure the meter clock, choose the node Meter Configuration -
Clockin the structure tree. Find out how the meter clock works and how it can be
configured in the section Meter clock(pg. 29).
Transformer ratios: For the meter to measure accurately, the ratios must be correct. To
configure the transformer ratio in CeweConfig, choose the node Meter Configuration
Measuringin the structure tree. Click the Generaltab in the window that opens. Fill in
the primary and secondary values for current and voltage.
Note: The values you choose as primary and secondary values will be considered as the
nominal values. These nominal values are used by several functions in the meter: alarms,
voltage monitoring and transformer compensation.
Presentation format for energy registers: To configure the presentation format for
energy registers, choose the node Meter Configuration Measuringin the structure
tree. Choose the prefix and number of decimals for energy registers. Based on the nominal
values, a capacity is calculated for how long the meter can measure without registersresetting. Read about energy registers in the section Energy registers(pg. 30).
Pulse constants for pulse outputs (Digital I/O): To configure pulse constants for pulse
outputsin CeweConfig, choose the node Meter Configuration Digital I/Oin the
structure tree. Find out how Digital I/Oworks and how it can be configured in the section
Digital inputs and outputs(pg. 33).
Display sequences: To configure display sequences in CeweConfig, choose the node
Meter Configuration Display sequencesin the structure tree. Find out how display
sequences work and how they can be configured in the section Display sequences(pg. 36).
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Configuration, reading and maintenance
Overview of funct ions
The following is a brief overview of the functions available in CewePrometer. All functions in the
meter can be both configured and read in CeweConfig. In many cases, CeweConfig can also export
data to a file or print out data.
Function Configuration location inCeweConfig
Section in handbook describingthe function.
Communication speed
Set the baud rate for the meter'soptical or serial port.
Meter Configuration Communication
Communications and security(pg.37)
Passwords
Regulate access to data in 5levels with passwords orhardware strap.
Meter Configuration Communication
Communications and security(pg.37)
Data loggingLog energy or instant values.
Meter Configuration Loggers Loggers(pg. 39)
Alarms
Activate alarms for events suchas voltage unbalance. Determinehow alarms will be presented.
Meter Configuration Alarm Alarms(pg. 41)
Maximum demand
Determine values that are to bestored as maximum averagevalues.
Meter Configuration Maximum Demand
Maximum demand(pg. 44)
Historical registers
Choose how a historical periodwill be finished.
Meter Configuration Historical Registers
Historical registers(pg. 45)
Time of use
Determine how rates shift overthe course of a day and whichregisters will be divided by rates.
Meter Configuration Time ofuse
Time of use(pg. 46)
Transformer compensation
Compensate errors and losses forinstrument and powertransformers.
Meter Configuration Measuring, TransformerCompensation tab
Transformer compensation(pg.48)
Power quality
Activate monitoring of voltagesags, swells and interrupts.
Meter Configuration Measuring, Power Quality tab
Power quality(pg. 50)
Language on display
Choose between severalavailable languages for thedisplay.
Meter Configuration Misc. Miscellaneous(pg. 52)
Information texts
Enter information texts that canbe read on the display and viacommunications.
Meter Configuration Misc. Miscellaneous(pg. 52)
Calibration LED
Set a pulse constant for thecalibration LED. This is used totest meter accuracy.
Meter Configuration Measuring, General tab
Product description(pg. 6)
Accumulate incoming pulses
Configure registers to accumulatepulses representing a selectablequantity.
Meter Configuration DigitalI/O, Inputs tab
Digital inputs and outputs(pg. 33)
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Configuration, reading and maintenance
Indicate alarms via pulseoutput
Choose a pulse output to be
activated in case of alarms.
Meter Configuration DigitalI/O, Outputs tab
Digital inputs and outputs(pg. 33)
Synchronise clock viaincoming pulse
Set an interval that the clock shallbe synchronised to uponincoming pulses.
Meter Configuration Clock
Meter Configuration DigitalI/O, Inputs tab
Meter clock(pg. 29)
Digital inputs and outputs(pg. 33)
Adjusting the clock for daylightsaving time
Set date and time for daylightsaving time.
Meter Configuration Clock Meter clock(pg. 29)
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Configuration, reading and maintenance
Changing configuration
To open a configuration form, click the folder Configurationin the structure tree and then click
one of the nodes: Display Sequences, Measuring, Clock, etc. Configuration changes can be made
in all configuration form. In the lower right corner, there is an Applybutton. If a meter is connected
and you click Apply, changes to the configuration will be immediately transferred to the meter. If
the changes affects registers or measurement, a warning dialog will be displayed. You can choose
not to send a portion of the configuration by clearing checkboxes in the dialog.
Warning dialog that sometimes is displayed when configurations are sent to the meter.
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Configuration, reading and maintenance
Working with configurations
In CeweConfig, you can work with configurations as a collection of CewePrometer's settings andsave them in a file. On CeweConfig's Filemenu, are the commands Save configuration, Open
configuration and New configuration. A configuration can either be for a 2- or 3-element meter.
You cannot transfer a 2-element configuration to a 3-element meter or vice versa. Transformer
corrections or passwords are not saved in configuration files. On the Filemenu, there is a command
for creating a configuration summary. Below is a list of how you can use CeweConfig's functions to
work with configurations.
Creating a configuration file without being connected to a meter
Choose New configuration when CeweConfig is not connected to create a configuration
file offline. The configuration file can be either of the 2- or 3-element type. Make all settings
that are to be included in the configuration file and save the file. The file's configuration canlater be transferred to a meter.
Saving a meter's configuration to a fileChoose Save configuration when CeweConfig is connected to a meter to save the meter's
configuration to a file. The configuration file can later be used as a backup or be transferred
to another meter.
Transferring a configuration file to a meter
Choose Open configuration when CeweConfig is connected to a meter to transfer a
configuration file to the meter. The changes in configuration cause a warning dialog box to
open. The configuration file can either be created without being connected to a meter, or be
saved from a meter; see the points above.
Printing out a summary of a meter's configuration
Choose View configuration Configuration summary when CeweConfig is connected to
a meter to create a summary of the meter's entire configuration. Now choose Print.
Printing out a summary of a configuration file
Open a configuration file and choose View Configuration summary to create a summary
of the configuration that is in the file. Now choose Print.
Note: ChoosingNew configurationor Open configurationwhen CeweConfig is connected to a
meter opens a warning dialog box with the message that the configuration in the meter will be
written over if you continue.
Reading
If you are connected to a CewePrometer with an authorisation level between 1 and 5, several
alternatives will be available in the structure tree under the node Reading. For the alternatives
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Configuration, reading and maintenance
Instant Valuesand Time, displayed values are constantly updated. The others are only updated
when the window is opened or when the Updatebutton is clicked. Read values can be printed out
and often also saved to files, this can be done by with buttons Printand Save.
Information about the meter
Information about the connected meter can be obtained by choosing View Information about the
meter.Some of the information displayed is the same as what appears on the meter plate.
Additionally, there is information on when the meter was manufactured and when the most recent
configuration change was made.
Under the Modules heading, the firmware currently used in the meter is listed. See the section
Updating firmware(pg. 27).
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Configuration, reading and maintenance
Versions and version conflicts
The latest version of CeweConfig can be used with all firmware versions of CewePrometer-R/W.The version number for CeweConfig is displayed on the application's title bar or under Abouton
the Helpmenu. The version number for the meter's firmware can be viewed under View
information about the meteron the Viewmenu.
CewePrometer and CeweConfig have three-digit version numbers according to the format main
version.sub-version.build number. As long as the main version and sub-version are the same,
CeweConfig and the meter are compatible. If the meter is of a newer version than CeweConfig and
the main version and/or sub-version are different, CeweConfig will display a message that
connection is not possible. CeweConfig must be updated.
Updating firmwareCewePrometer is designed with a number of modules that each have their own processors and their
own firmware. The module firmware is distributed in a package file (.pkg) which is transferred to
the meter using CeweConfig. Newly developed and improved functions can thus be added in a
meter that lacked these functions when delivered.
Note: Be sure to update CeweConfig to the latest version before updating the meter. There is
otherwise the risk that CeweConfig will no longer be version-compliant after firmware updating.
On the Toolsmenu, there is an Update firmwarecommand when the meter is connected with
authorisation level 4 or higher.Begin by choosing the file that contains the update. The file name
and version number will then be displayed, and sometimes a message. Click the Advancedbutton
to view CeweConfig's version number by module for both the file and the meter. Additionally, you
can force modules to be updated even if the file has the same version number. Click Updateto
begin updating.
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Configuration, reading and maintenance
During the time the update is being installed, the meter stops measuring and registering energy.
Depending on the size of the file to be transferred and the baud rate, the time for updating can vary
from a few minutes to a half hour at the highest baud rate. If possible, connect at the highest baud
rate (19200 bps) to speed updating. After updating, the meter is restarted to complete installation of
the meter's new firmware.
Updating can be performed via a modem but this should be avoided since reliability for this method
of communication is too low. An interrupted update can leave a meter with incomplete firmware
that cannot measure at all. If an update via a modem has failed, the next update must be made via
RS232/422 or the optical head.
Language
CeweConfig can be set to different languages. The available languages can be seen under
Languageon the Viewmenu.
Resetting registers and logs
CewePrometer's various registers and log data can be reset with CeweConfig if a meter is connected
and you are connected with a sufficiently high authorisation level. You will find a number of
choices under Reseton the Toolsmenu. Some options may be marked in grey if your authorisation
level is not high enough. To reset energy registers, authorisation level 5 is required, and level 3 for
other options. A warning dialog box opens before resetting.
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Functions
Functions
Meter clock
The CewePrometer has an integrated real-time clock for time-dependent functions. Information
about time adjustment and daylight saving time status is recorded with tags on the logged values;
see Loggers(pg.39). Time adjustments are also noted as an event in the event log; see Appendix B -
Events(pg. 61).
Instantaneous adjustment
The meters date and time can be set to an absolute point in time. Instantaneous adjustment of the
meters time can influence logged values. To avoid this, the meter's log memory is reset when doing
instantaneous adjustment. For this reason, instantaneous adjustment of the meter clock is primarily
intended for use at initial configuration of the meter.
Sliding adjustment
The meters time can be adjusted successively. Instead of the meter adjusting the clock
instantaneously, the total adjustment is spread out over a longer period. A speed of adjustment can
be chosen in the 140% range. With 40%-adjustment, the clock is adjusted 24 seconds for each
minute until the total adjustment has been made.
Daylight savings time
CewePrometer offers the alternative of letting the meter clock follow daylight savings time. At a
specified date, the meter clock is adjusted forward, and at another, adjusted backward.
Example: On 28 March the clock is to be adjusted forward, from 02:00 to 03:00. The adjustment
back to standard time is to occur on 31 October at 3:00 (daylight savings time) when the clock is to
be set back to 02:00. The following is set in the meters: Begin March, 28, 02:00. End October, 31,
03:00 and the standard time is to be adjusted by 60 minutes.
External synchronisation
The meter time can be adjusted by a pulse on one of the meters digital inputs. When a pulse is
registred, the clock is adjusted to the closest multiple of a specified synchronisation interval. If the
synchronisation interval is, for example, one hour and the time is 13:29, a pulse will adjust the clock
to 13:00. If the time had instead been 13:31, the clock would have been adjusted to 14:00.
Available synchronisation intervals are:
10, 15, 20 and 30 minutes
1 hour
Times 12:00 and 00:00
Time 00:00
Besides specifying that the meter clock will synchronise via external pulses, a digital input must
also be configured for clock synchronisation; see the section Digital inputs and outputs(pg. 33).
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Functions
Energy registers
Energy registers in the CewePrometer are electronic counters that accumulate energy. Prefixes andnumber of decimals are configured which apply to all energy registers. Energy registers have a
width of nine digits, regardless of the total number of decimals and the prefix configured. When an
energy register has reached its maximum figure (for example, 999999.999 kWh), it resets to zero.
Fewer decimals and larger prefixes give the energy registers space for more energy without
resetting. Read more about how energy is calculated and defined by quadrants in Appendix F
Calculation Principles(pg. 67).
Overview
The table shows the energy registers available in the meter.
Energy type Energy directi on Total values Per phase values Total numberActive energy Import, export Yes Yes (3-element
meter only)8
Reactive energy Import, export,quadrants I-IV,capacitive, inductive
Yes No 8
Apparent energy Import, export Yes No 2
III
III IV
Active power import(+)
Active power export(-)
Reactive powerexport (-)
Reactive power
import (+)
SQ
P
Capacitive
Inductive
Quadrants Phase angle Current relative to voltage
I 0 to 90 Lagging
II 90 to 180 Lagging
III -180 to -90 Leading
IV -180 to 0 Leading
Storage in non-volatile memory
All registers are saved in non-volatile memory once per second. Loss of auxiliary voltage therefore
results in no more than one second of lost historical energy measurement data. For optimal
safekeeping, all registers are saved in three alternating memory areas.
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Functions
Instant values
Besides energy, the CewePrometer can also measure instant values. Instant values are constantlychanging values such as current, voltage, power and harmonics. The formulas and definitions used
to calculate the values are presented in Appendix F Calculation Principles(pg. 67).
Overview
This table provides an overview of the instant values that can be read on the meter. Readings can be
viewed with CeweConfig, on the display and with other software that has implemented
CewePrometers communication protocol. Most instant values can be logged as average values; for
more information, see section Loggers(pg. 39).
Instant value Available on 3-element
meter
Availab le on 2-element
meterFrequency Yes Yes
Power factor total Yes Yes
Power factor per phase Yes No
Active power total Yes Yes
Active power per phase Yes No
Reactive power total Yes Yes
Reactive power per phase Yes No
Apparent power total Yes Yes
Apparent power per phase Yes No
Phase to phase voltage L12, L23, L31 Yes (calculated)1
Yes
Phase voltage Yes No
THD voltage Yes (phase volt.) Yes (phase to phase volt.)2
Amplitude voltage harmonics (231)4
Yes (phase volt.) Yes (phase to phase volt.)2
Phase symmetry voltage Yes (phase volt.) Yes (phase to phase volt.)
Current Yes (L1, L2, L3) Yes (L1, L3)3
THD current Yes (L1, L2, L3) Yes (L1, L3)
Amplitude current harmonics (231)4
Yes (L1, L2, L3) Yes (L1, L3)
Phase symmetry current Yes Yes4
Phase angle total Yes Yes
Phase angle per phase Yes No
Update frequency
The update frequency for instant values is proportional to the frequency of the measuring voltage.With a 50 Hz measuring voltage, updating occurs 12.5 times per second, and at 60 Hz, 15 times per
second. Instant values can be read up to twice per second via the serial port when it is set to 19200
baud.
1Calculated from the voltages fundamental vectors.2The harmonics for voltage on the 2-element meter are to be seen from the standpoint of the voltages being D-
connected internally.3Current L2 is calculated internally in the 2-element meter for monitoring.
4The value can be read in CeweConfig and via the communication protocol but cannot currently be presented on the
display (meter firmware 1.2.0).
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Accuracy
The table shows typical accuracy for a CewePrometer with accuracy class 0.2 for a selection ofinstant values.
Instant value Range Accuracy better than:
Voltage amplitude Umin - Umax 0.1% of reading
Current amplitude 5 % of Imax - Imax 0.1 % of reading
Current amplitude 15% of Imax 0.05 % of Imax
Frequency 4763 Hz 0.02 % of reading
Power 1 % of Imax - Imax Corresponds to meters classaccording to energy measurementstandard
Power factor At PF=0.5 and current 5% of Imax- Imax
0.1 % of reading
Harmonics measurement
Harmonics numbers 2 to 31 are measured for all currents and voltages. At a fundamental frequency
of 50 Hz, the second harmonic is 100 Hz, the third harmonic is 150 Hz, etc. Both the harmonics
amplitude and phase angle are measured and included in the calculation of power and energy, and
can be read via the meters communication protocols. In CeweConfig, harmonic amplitudes are
presented with a diagram.
THD
THD stands for Total Harmonics Distortion and is a measurement of the amount of harmonics
present in a signal. Voltages and currents THD can be read via CeweConfig and on the display.
Harmonics on 2-element meter
The harmonics measurements of voltage on the 2-element meters should be seen from the
standpoint of the voltages being D-connected internally in the meter. The harmonics measured are
the vector sums of the phases harmonics.
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Functions
Digital inputs and outputs
The CewePrometer has several inputs and outputs that can be configured to perform various tasks.Both inputs and outputs are protected against overvoltages by varistors. They also have an isolated
interface between the electronics and the surroundings to ensure personal safety. For electrical data
on the meters inputs and outputs, see Appendix H Connection Data(pg. 73).
Inputs
The inputs can be configured as follows:
Not used
The input is not used.
Finish historical period
An incoming pulse will result in the present period ending and registers being copied tohistorical registers. For a pulse to finish historical period, it is also necessary that the
historical registers be configured to allow this. For more information, see the section
Historical registers(pg. 45).
Pulse input
To register pulses from pulse-producing units, such as energy meters or water meters, pulse
inputs are used. Incoming pulses are accumulated in registers called external registers. There
is an external register connected to each input on the meter. For external registers, a factor is
configured by which the number of incoming pulses is multiplied. Prefixes and the number
of decimals can also be configured for the registers. Moreover, the registers can be
configured with descriptive texts.
Time synchronisation
When incoming pulses are received, the meters clock is synchronised at a specific interval
For available synchronisation intervals and more detailed information on time
synchronisation, see the section Meter clock(pg. 29).
Registration of pulses
The meter registers pulses on positive or negative flanks, depending on if the input is set to inverted
or not. A pulse must be at least 16 ms long to be guaranteed of being detected by the meter. The
maximum pulse width that the meter can handle is 60 s. By setting limits for maximum and
minimum pulse lengths, the meter can be limited as to what it detects as a valid pulse. Pulses withlengths beyond the established limits are ignored. The occurrence of to long or to short pulses can
also be configured to be recorded in the event log.
Pulse
length
GND
VCC
Pulse length
(inverted input)
The figure shows pulse lengths when an input is inverted or non-inverted, respectively.
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Functions
Outputs
The outputs can be configured as follows:
Not usedThe output is not used.
Pulse output
The output is used to pulse an energy type that the meter is measuring. A pulse constant is
specified for the output as pulses/unit, primary or secondary, and the pulse length is
specified for all pulse outputs. The shortest possible pulse length is 40 ms. Pulses are not
allowed not come too often, and because of this, there is a relationship between the pulse
length and the specified pulse constant that maximises the pulse frequency to 1000/(pulse
length(ms) * 2).
Pulse Gap
Maximum pulse frequency at outputs limited so that the gap is at least as long as the pulse
length.
Remote control
With this function, the output can be made active or inactive by sending commands to themeter via the IEC62056-21/IEC1107 protocol. This functions could be used control
anything that can be controlled with a digital relay output.
Alarm outputWhen an output is set to functions as an alarm output, one or more of the user-defined
alarms can be chosen to indicate at the output. When an alarm occurs, the output switches to
active, and when the alarm state ceases, the output returns to inactive. In the section Alarms
(pg. 41), user-defined alarms are described and how they can be configured.
In contrast to the other selectable functions for outputs, alarm outputs can be inverted. Note
that outputs are inverted via firmware. If the meter loses its auxiliary power, the relay willopen, regardless of it is inverted or not.
End of MD period (maximum demand period)
At the end of a set MD period, the output will go active for one second before returning to
the inactive state. See the section Maximum demand(pg. 44).
Output states
An active output means a closed relay when the output is not inverted. When the output is inverted,
the active relay is open. Only when the output is used as an alarm output can it be inverted. The
CewePrometer outputs are of the solid-state type and when the meter is turned off, they are open.
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Functions
Meter variants
Meter No of inputs No of outputs
CewePrometer-R 4 6CewePrometer-R 2 10
CewePrometer-R 0 12
CewePrometer-R 0 0
CewePrometer-W 4 8
CewePrometer-W 0 0
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Functions
Display sequences
The following is a description of the function properties of CewePrometers display sequences. Thesection Using the display(pg. 53) describes how to navigate in the display sequences via the
meters buttons, and Appendix A Display Layouts(pg. 57) lists all of the CewePrometers
available display layouts.
Menu for choosing one of the four display sequences. The names of the sequences can be configured.
The CewePrometer is equipped with a graphic display that can show the information available inthe meter. To organise the information, there can be up to five display sequences with a maximum
of 40 selectable display layouts in each. Each display sequence can be given a name that will be
presented on the display.
Display sequence five is only accessible via the sealed button under the front panel window. The
front panel window can be sealed to provide additional security. For this reason, it is appropriate
that display layouts with sensitive information and sensitive functions be placed in display sequence
five.
Automatic disp lay cycl ing
Automatic display cycling means that the display layouts in one or more display sequences areautomatically cycled by the meter. If, for example, display sequences 1 and 3 are configured for
automatic display layout cycling, the meter will first cycle the display layouts in sequence 1 from
the first to last layout, and then continue with sequence 3. After the last layout in sequence 3,
cycling restarts with the first layout in sequence 1. The display layouts cycle with a configurable
delay of 1 to 30 seconds. If a user manually navigates in the display sequences via the meter's
buttons, cycling automatically stops and continues again after one minute.
Passwords and security
The display sequences can be configured to be password protected to limit access for various users.
When a user chooses a password-protected display sequence via the meters buttons, a password
entry field is displayed. Only a correctly entered password gives access to the display sequence andto the display layouts that are included in it. A password can be up to six characters long and
include the characters A-Z, 0-9 and :;=?@. Passwords are not case-sensitive.
Note: If a password-protected display sequence is configured for automatic display layout cycling,
password protection is deactivated.
Automatic return to f irst display layout
One minute after a user has stopped navigating in the display sequences, the CewePrometer returns
to the first display layout in display sequence 1 if automatic display layout cycling is not activated
for any display sequence.
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Functions
Communications and security
All CewePrometers are equipped with an optical port for communication. The meter can beoptionally equipped with one or two additional communication ports with RS232 or RS422
interfaces. The communication protocol used is IEC62056-21, or as the older version of the
standard is called, IEC1107. For more information on how the protocol is implemented, see the
document CewePrometer IEC1107/IEC62056-21 meter reading.
Communication speed
The meters optical port always starts with a baud rate of 300 bps, regardless of what is configured,
before shifting over to the specified communication speed. This means that software (for example,
CeweConfig) that communicates with the meter via the optical port does not need to know the
speed that the meters optical port is set to. The optional ports designated as communication ports
#1 and #2 differ in this respect. They start at the specified baud rate from the beginning, whichmeans that connected software must be aware of the speed to be able to communicate.
Communication port #1 can be set at a speed of between 300 bps and 19200 bps, and
communication port #2 can be set at a speed of between 1200 and 19200 bps. The optical port can
be set at a speed of between 300 and 9600 bps.
Modem initiation
If a modem is connected to one of the optional ports, a modem initiation string can be configured
that the meter sends via the serial port. The initiation string can be used to set the correct
communication settings for the modem and can consist of AT-Commands. The meter sends the
initiation string when the meter is turned on and thereafter every tenth minute. During ongoingcommunications, the meter waits to send the initiation string until communications has stopped.
Security
The meter has five authorisation levels that can limit access to the meter during communication via
any of the meters communication ports. Authorisation levels 1 and 2 are password-protected.
Authorisation levels 3 to 5 may be protected by passwords or by a circuit board jumper.
Authorisation levels
1 Provides access to reading.
2 Provides access to everything in level 1 plus
access to set the clock and finish historicalperiods (also resets maximum demand
values).
3 Provides access to everything in level 2 plus
access to configure the meter.
4 Provides access to everything in level 3 plus
access to transfer new firmware to the meter.
5 Provides access to everything in level 4 plus
access to calibrate the meter and reset
registers.
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Limitation of total access attempts
The meter limits the total number of access attempts to six when incorrect passwords are entered.
At the seventh attempt, the meter blocks access whether the password is correct or not. The block isin effect until the next hour shift. After that, new password attempts may be made.
Passwords
A password consists of up to 12 case insensitive alfa-numerical characters. The authorisation check
may be deactivated for a level by deleting the password. When connecting to the meter, access is
granted to the highest level that is lacking password regardless of the password given by the user.
Access restriction via circuit board jumper
Inside the CewePrometer, there is space for a circuit board jumper that provides access to
authorisation level 5 when fitted. If the meter is connected with authorisation at level 5, the functionof the jumper can be modified. Security can be heightened by requiring the jumper even for lower
authorisation levels down to level 3. Security can also be relaxed by making authorisation level 5
accessible via a password. Cewe Instrument can provide a technical fact sheet, tfcr0004, that
describes the procedure for opening the meter and fitting the jumper.
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Functions
Loggers
The CewePrometer has two identical, parallel and individually configurable loggers. That which isdescribed in this section applies both to logger 1 and logger 2.
Overview
A logger in a CewePrometer can log average values for instant quantities, energy registers and
external registers. Some quantities can be logged both by phase and as total values for all three
phases, others only as total values. The table provides an overview of quantities that can be logged.
Certain instant values in the table are not available in 2-element meters and thus cannot be logged;
see the section Instant values(pg. 31).
Quantity By phase Total
Active energy import Yes YesActive energy export Yes Yes
Reactive energy import No Yes
Reactive energy export No Yes
Reactive energy inductive No Yes
Reactive energy capacitive No Yes
Reactive energy QI No Yes
Reactive energy QII No Yes
Reactive energy QIII No Yes
Reactive energy QIV No Yes
Apparent energy import No Yes
Apparent energy export No Yes
Phase voltage Yes Yes
Phase to phase voltage Yes Yes
Current Yes Yes
Active power Yes Yes
Reactive power Yes Yes
Apparent power Yes Yes
Frequency Not applicable Yes
Phase angle Yes Yes
Power factor Yes Yes
THD voltage Yes Yes
THD current Yes Yes
External registers 18 Not applicable Yes
Energy is logged as register values, i.e. at each logging occasion the current registers values is
logged. Based on these register values, the reading software can present the energy as register
values, periodic energy or as average power. CeweConfig provides all three alternatives.
Logging interval and total channels
A logger can store data in 1 to 10 channels. Common for all channels in a logger is that that the
logging interval that can be configured from one minute up to one hour. A loggers capacity is
dependent on number of channels and logging interval. When the logger is full, the oldest values
will be written over. The table shows the capacity in number of days before the oldest value is
written over.
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Capacity in days
Number of l ogging channels
Logging interval
(min) 1 2 3 4 5 6 7 8 9 101 21 14 10 8.6 7.2 6.2 5.4 4.8 4.3 3.9
2 43 28 21 17 14 12 10 9.6 8.6 7.9
5 108 72 54 43 36 31 27 24 21 19
10 217 144 108 86 72 62 54 48 43 39
15 326 217 163 130 108 93 81 72 65 59
30 652 434 326 260 217 186 163 144 130 118
60 1304 869 652 521 434 372 326 289 260 237
Storage of logged values
Logged values are saved with time stamps, tariff information and flags that indicate events that haveoccurred during the logging interval.
The time stamp indicates the end-time. If the logging interval is configured to one hour, a
value with the time stamp 15:00 refers to the period 14:00 to 15:00.
Tariff information indicates active rates for energy and power during the past interval.
To indicate events or states during an interval, a logged value can be stored with one or
more flags.
Event or state Name of flag Explanation
Time adjusted T During the past interval, the meter clock has been adjusted either instantaneous or a slidingadjustment is in progress.
Disturbed D The past interval is incomplete. For example, an interval shortened by the meter beingwithout auxiliary power or if the logging memory has been reset. The first value after thelogging memory having been configured will thus always be indicated with "Faulty value(the logging memory is reset in conjunction with reconfiguration).
Alarm A In conjunction with user-defined alarms being configured, it may be specified that an alarmwill also be indicated with logged values. When a user-defined alarm has triggered duringthe past interval, this is indicated with the flag Alarm.
Parameter changed P The CewePrometers configuration, calibration or initiation has changed. Which of thesethree the flag refers to can be seen in the event log.
Incorrect energydirection
R The CewePrometer can be configured for a normal energy direction, import or export. If themeters energy direction deviates from this, this is indicated with the flag Incorrect energydirection.
Daylight savingstime
S Daylight saving time has been in effect during the past interval.
Voltage
loss/missing
V During the past interval all measuring voltages have been lost or missing.
Invalid value C To be able to guarantee that a logged value is correct, it is logged with a control sum. If thecheck sum is incorrect when the value is read, this is indicated with Invalid value. This is arare event, but could occur if the meter is subjected to powerful, external electromagneticinterference.
For several of the flags, additional information can be viewed in the event log. A more exact
time for events is specified in the log.
Note: When power is calculated from logged energy values, the resulting values will be somewhat
more precise than when power is logged directly. This is because power is logged as an average
value of instant values. The instant values are read twice per second, while energy is accumulated
continuously.
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Alarms
The CewePrometer is equipped with alarms to be able to indicate when measured quantities areover or under a configurable limit value. The meter enters the alarm state when the limit value is
reached. An alarm is generated only after the alarm state has continued for a configurable time
(delay). Alarms are configurable by the user and are therefore called user-defined alarms. For the
CewePrometer 1.2.0 or earlier, the maximum delay is 64 seconds.
Note: There are alarms and events that cannot be configured, but instead, are always active.
Examples of such alarms are indication that the clock has been changed or that an auxiliary power
loss has occurred. For more information, see the sectionEvent log(pg. 43).
Overview
For most user-defined alarms, the limit value is specified as a percentage of the nominal value,which is the configured, nominal primary value (current, voltage or power). For 3-element meters,
the limit value corresponds to phase voltage, and for 2-element meters, phase to phase voltage. The
following table provides an overview of available alarms.
Alarm Alarm state appl ies when Comm ents
Low voltage The average value of the voltages is beneath thenominal voltage limit value.
High voltage The average value of the voltages is above thenominal voltage limit value.
Low power factor The power factor for the 3-phase system isbeneath the limit value.
Voltage unbalance A voltage deviates percentage-wise from theaverage value of all voltages more than the limitvalue.
Current unbalance A current deviates percentage-wise from theaverage value of all currents more than the limitvalue.
Low active power The 3-phase systems total power is beneath thenominal power limit value.
High active power The 3-phase systems total power is above thenominal power limit value.
High THD voltage The average value of THD for all voltage phasesexceeds the limit value.
High THD current The average value of THD for all current phasesexceeds the limit value.
High harmonic voltage An overtone (2nd to 31st) relative to the basic
tone on same voltage phase exceeds the limitvalue.
The event log identifies the
phase and harmonic no.
High harmonic current An overtone (2nd to 31st) relative to the basictone on same current phase exceeds the limitvalue.
The event log identifies thephase and harmonic no.
Reverse energy direction The phase angle for a phase deviates by morethan 90 degrees from another phase.
The event log identifies thephase with the deviating energydirection. This alarm is notavailable on 2-element meters.
Voltage phase missing One or more voltage phases is missing The event log identifies themissing phase or phases.
Internal error See the section Event log(pg. 43).
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Indication
Alarms are always stored in the event log. Alarms can also be configured to indicate in one or moreof the following ways:
Alarm LED on meter front
Changed digital output level
Indication of a logged value with a flag
The alarm LED stops flashing and the digital output returns to inactive low after the alarm state
passes.
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Event log
The CewePrometer has a number of defined events and alarms that are stored in the meters eventlog when they occur. The event log can contain a maximum of 40 events. Thereafter, the oldest will
be removed to make room for the new. The meter has a counter for the total number of events that
have occurred since the latest reset.
An event is represented by a time stamp and a code that indicates what has occurred. See Appendix
B - Events(pg. 61) for a complete list of all events. For certain events, data is also stored for the
events, for example, which phase the event concerns.
Events are divided into three categories:
User-defined alarmsThe meter has a number of alarms that when they occur, generate an event in the event log.
The alarms each have an individual configuration that determines the conditions for when an
alarm is to be activated. See the section Alarms(pg. 41).
Meter events
The meter is also equipped with a number of alarms that are not configurable by the user,
so-called meter events. These have set conditions and are stored only in the event log.
Examples of meter events are auxiliary power loss and clock resetting. A complete list of
meter events is in Appendix B - Events(pg. 61).
Internal errors
The contents of the internal data structures, such as configuration and energy registers, arechecked by the meter. If an error is detected in one of the data structures, it is designated as
an internal error. If an internal error is indicated, the event log should be checked for related
information, and suitable actions should be taken. Internal errors are listed in Appendix B -
Events(pg. 61).
Display of events
The event log can be viewed on the meters display if the display layout Eventsis configured to be
included in one of the meters display sequences. Only the time stamp and event code are shown on
the display. A more detailed description of the meter's events can be viewed in CeweConfig, which
converts the code into plain text and displays any related data. Via CeweConfig, the event log can
also be printed out or saved to a file.
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Functions
Historical registers
Historical registers are used by the CewePrometer to store current register values at defined pointsso as to be able to read them later. Stored in historical registers are all maximum demand values,
external registers, TOU registers and energy registers, with the exception of energy registers by
phase. The historical registers are time stamped to indicate when storage occurred. The
CewePrometer can store up to 14 historical registers.
Date and time
Energy registers Maximum demandvalues
Time of use registers External registers
Historical register includes a number of stored registers, and dates/times when they were stored.
Finish historical periods
By finishing a historical period, the current registers values are stored in historical registers and the
maximum demand values are reset. When a period is finished, an event is stored in the meters
event log. Periods can be finished in various ways:
Via meter button The period is finished when the meters Menu/Apply button
is held down for more than two seconds when the display
layout Finish periodis active.
This requires both that the historical registers are configured
to permit finish via the meter button and that a display
layout for this is entered in a display sequence.
Via CeweConfig The period is finished when a command is given from
CeweConfig or third-party software.
At the end of the
month
The period is finished when the meter clock reaches the end
of the month.
Via digital input. The period ends when a pulse is received at a digital inputon the meter.
This requires both that the historical registers are configured
to permit ending via a digital input and that an input is
configured for this purpose.
Note: The display layoutFinish periodwill only work if the meter is configured to permit ending a
period via a button.
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Functions
Time of use
Time of use is a function that enables energy to be divided up into various registers depending onthe rate that applied when the energy was measured. In the CewePrometer, tariff structures can be
stored that switch rates at predetermined times according to a configurable pattern. A tariff structure
consists of seasons, day types and special days. The maximum number of rates is eight.
Day types specify how rates change during a 24-hour day.
Seasons specify the day types that apply during the days of the week, Monday to Sunday.
Special days specify the day type that applies on a certain date.
Tariff structures
In the CewePrometer, there are two separate tariff structures. Both tariff structures have a set of daytypes, seasons and special days. By setting a starting date for a tariff structure, it can be configured
before it goes into force.
Day type
In the CewePrometer, there are 16 day types (AP). A day type specifies witch rate, from a
maximum of eight, should apply when during the day. 16 changing points per day may be specified.
A day type can be connected to a day of the week in a season or to a special day.
Season
A season refers to a period. During this period, the season defines the day types that will apply
during the days of the week. In the CewePrometer, there are 16 seasons per tariff structure. The
seasons are arranged in a sequence where one season replaces the previous at a predetermined date.
Special days
Days that change rates according to a pattern that is not covered by linking day types to seasons
(such as holidays) are called special days. A special day specifies the day type that applies on a
certain date. Special days can be configured to apply every year on the same date or for a single
year. In the CewePrometer, up to 30 special days per tariff structure can be configured.
TOU registers
An energy register or external register that is chosen to be divided into the rates is a TOU register.There are eight TOU registers and each TOU register has separate registers for eight rates.
Maximum demand values and tariffs
Maximum demand values are stored together with information on which rate applied when
registered. For one and the same day, there can be separate day types for energy and maximum
demand values.
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Functions
Example:The conditions are Monday to Saturday, rate 2 applies from 7:00 in the morning until
17:00 in the afternoon. For the rest of the day, rate 1 applies. On Sundays, rate 1 applies around
the clock. During the summer months, 1June to 31 August, rate 1 applies around the clock. On
Christmas Eve, 24 December, rate 1 applies around the clock. For maximum demand values, rate 3
always applies. It is active energy import that is divided in to different rates.
Day types
Three day types must be configured. Day type A to apply to energy during the autumn, winter and
spring. Day type B to apply during the summer months, and day type C for maximum demand
values throughout the year.
Day type A Day type B Day type C00:00 Rate 1 00:00 Rate 1 00:00 Rate 3
07:00 Rate 2
17:00 Rate 1
Seasons
Two seasons must be configured. The first season will apply during the summer period and the
second the rest of the year. The season that applies from 1 September will also apply from 1
January to 31 May.
06-01 Energy A A A A A A B
MD C C C C C C C
09-01 Energy B B B B B B B
MD C C C C C C C
Special day
For rate 1 to apply all of Christmas Eve, a special day must be configured. Because no year is
specified, the special day will apply every year.
12-24 Energy C
MD C
TOU register
A TOU register is configured to accumulate active energy in several registers for the different
rates.
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Functions
Transformer compensation
Transformer compensation is a function for compensating for measurement errors in instrumenttransformers and for losses in power transformers. The function enables the CewePrometer to
present measurement values for which errors and losses have been compensated. The formulas used
in the meter are presented in Appendix F Calculation Principles(pg. 67).
Overview
The tables present an overview of the transformer compensations in CewePrometer.
Instrument transformer compensations
Name Value to entered
Amplitude error as percentVoltage error L1, L2, L3
Phase angle in minutesAmplitude error as percentCurrent error L1, L2, L3
Phase angle in minutes
Power transformer compensations
Name Value to entered
Active loss as percent of nominal powerCopper losses, Total values
Reactive loss as percent of nominal power
Active loss as percent of nominal powerIron losses, Total values
Reactive loss as percent of nominal power
Instrument transformer compensations
To compensate for errors in instrument transformers, their amplitude error in percent and phase
angle error in minutes are configured in the meter. One minute is equal to the angle 1 /60. The
errors can be specified separately for all voltages and currents. When instrument transformer
compensations are used, current and voltage are affected, as well as all quantities that arise from
these: power, energy, etc.
2-element meter
When voltage errors are compensated on a 2-element meter, this is done on phase to phase voltages
L12, L23 and L31 instead of on phase voltages. Only L12 and L23 are included in the calculation of
power and energy. Compensation of L31 has no significance in this respect. In compensation of
current errors for 2-element meters, only L1 and L3 can be compensated for because they are theonly currents measured.
Power transformer losses
Power transformer losses consist of copper and iron losses. They are expressed as percentages of
nominal power. One value is specified for active loss and one for reactive. When compensation of
losses is configured, power, energy, power factor, etc. are affected but not current and voltage.
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Functions
Calculating loss values
Based on the nominal total power and the measured loss value in watts, a loss value can be
calculated as a percentage of nominal power. It is the loss value that is configured in the meter.
Nominal power is calculated with configured nominal current and voltage.
Nominal power: 3= nomnomnom voltageLineCurrentPower
Loss value: 100/ = nomPowerLossvalueLoss
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Functions
Power quality
Power quality encompasses voltage monitoring and harmonics measurement. Harmonicsmeasurement is described in the section Instant values(pg. 31).
Voltage monitoring
Voltage monitoring monitors three states: swells (overvoltage), sags (undervoltage) and interrupts.
Monitoring is activated by configuring the limit values for sags and swells, and is deactivated by
setting the limits to zero. The limits are expressed as percentages of configured nominal voltage.
Example: For an upper limit of 110% and a lower limit of 90%, and the configured nominal
primary voltage of 10 kV, the limits attained are 9 kV and 11 kV primary.
For 3-element meters, the average value for phase voltage is monitored, and for 2-element meters,the average value for phase to phase voltage is monitored.
Sags and swells
Sags and swells shorter than one second are registered by accumulating registers. If the state lasts
longer than one second, it is instead registered in the event log with a time stamp and duration. The
accumulating counters and the event log can be read in CeweConfig.
Interrupts
When the average value for voltage falls to under 10% of the configured nominal voltage, this is
registered as an interrupt in the event log with a time stamp and duration. Duration for an interruptof less than three seconds, and down to 10 ms, is presented as "< 3 s".
State Duration Registered in Duration presented as
Sags and swells 160 ms51 s Accumulating counter Duration not specified
Sags and swells > 1s Event log Duration of state
Interrupt 10 ms6 3 s Event log < 3 s
Interrupt > 3 s Event log Duration of state
5Applies to basic frequency 50 Hz. Corresponding time at 60 Hz is 130 ms.
6Applies to basic frequency 50 Hz. Corresponding time at 60 Hz is 8.3 ms.
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Functions
Hysteresis
Hysteresis means that the limit for a state and the limit for when it is restored are different. This to
avoid several states being registered when the voltage level varies around a limit. The hysteresislimit is always midway between the low or high limit and nominal voltage.
110%
105%
100%
95%
90%
Limit for swells
Nominal voltage
Hysteresis limit
Limit for sags
Hysteresis limit
11 kV
10 kV
9 kV
9,5 kV
10,5 kV
Limit for interrupt
Duration sag
Duration
interrupt
10%1 kV
PercentPrimary vol tage (example)
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Using the display
Using the display
This section describes how the CewePrometers display can be used to read measurement valuesand also to control certain functions in the meter. The display layouts are arranged in display
sequences. For details on display sequences, see Display sequences(pg. 36). A complete listing of
display layouts is presented in Appendix A Display Layouts(pg. 57).
Quadrant indicator
In most display layouts, a quadrant indicator is shown in the lower-right corner. The quadrant
indicator shows the quadrant in which energy is currently being measured. See Appendix F
Calculation Principles(pg. 67) for a definition of quadrants.
Quantity
Measurement value
Unit
Phase
Quadrant indicator Display layout
Quadrant I
Quadrant II
Quadrant III
Quadrant IV
Voltage order display layout
When the CewePrometer starts, the display layout Voltage Orderis always shown for about 15
seconds. The display layout shows the order of the connected measurement voltages. If the voltage
order is correct, the current direction is indicated with a + or a -. If not all voltages are connected,
Phase missing is shown on the display. The current direction is indicated with a + if the currents
phase angle is following its voltage with a maximum deviation of 90; if it is not, a - is displayed.
Correct voltage order and current direction.
Reversed current direction on phase 1.
Reversed voltage order (no current direction shown).
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Using the display
Navigating in display sequences
Use the buttons on the front of the CewePrometer to step through the display sequences. For moreinformation, see the Product description(pg. 6) section for button placement.
Step forwardStep to next layout in the display sequence or moves upward in a menu.
Menu/Apply
The Menu/Apply button is used to open the menu where one of four configurable display sequences
can be chosen. The button is used to confirm choices or initiate other activities depending on the