TCX 840 - Fire Alarm...

Controlling Tomorrow’s World

TCX 840

30-3001-493 Version D

Installation GuideTCX 840 Family

www.PDF-Zoo.com

www.PDF-Zoo.com

TCX 840 Family Installation Guide i

Version D

Reproduction or distribution forbidden.Copyright 1997 by Andover Controls.

Subject to change without notice.

Order No. 30-3001-493

Copyright 1997Andover Controls Corporation300 Brickstone SquareAndover, Massachusetts 01810 USAAll Rights Reserved.

Published by the Engineering Department at Andover Controls Corporation.

IMPORTANT NOTICE

This product is subject to change without notice. This document does not constitute any warranty, express or implied. Andover Controls Corporation reserves the right to alter ca-pabilities, performance, and presentation of this product at any time.

www.PDF-Zoo.com

ii Andover Controls Corporation

NoteThis equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions in this manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

NoteThis digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.

AvisLe présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des Communications du Canada.

www.PDF-Zoo.com

TCX 840 Family Installation Guide iii

Contents

TCX 840, 843, 845, 846 Terminal Control Units

TCX 840 Series Characteristics ....................................................................2 What You Received ......................................................................................2

Parts Included with the TCX 840 Series ..................................................2 Mechanical Installation .................................................................................3 Chassis Road Map .........................................................................................4 Power Connection .........................................................................................5

Battery Connection & Replacement ........................................................5 24 VAC Connection .................................................................................6 Building Ground Requirements ...............................................................7 Inspecting the Ground ..............................................................................7 Lightning Protection ................................................................................7

Infinet Network Connection ..........................................................................8 Input Connections .........................................................................................9

Universal Inputs .......................................................................................9 Input Wiring .............................................................................................9 Wiring Concerns ....................................................................................10 Thermistor Inputs ...................................................................................10 Voltage Inputs ........................................................................................13 Digital/Counter Inputs ...........................................................................13

Air Flow Sensor Connection .......................................................................14 Output Connections .....................................................................................15

Output Wiring .........................................................................................15Switching Loads with Triacs ...................................................................15Wiring Concerns .....................................................................................15

www.PDF-Zoo.com

iv Andover Controls Corporation

Form A Outputs ......................................................................................16 Form K Tri-state Outputs .......................................................................16 Analog Outputs ......................................................................................17

Operation .....................................................................................................18 Service Tool ...........................................................................................18

Pre-Operation Checks .......................................................................18 Initial Power-Up ................................................................................18

Troubleshooting ..........................................................................................20 CPU LED Is Not Blinking ................................................................20 Unit Appears Functional But Is Not Responding To CX Controller ...........................................................................................21 One Input or Output Appears to Be Dysfunctional ...........................21

Sample Applications ...................................................................................22

www.PDF-Zoo.com

TCX 840 Family Installati on Guide 1

TCX 840, 843, 845, 846Terminal Control Units

This manual describes the installation and care of the TCX 840 family of terminal con-trol units.

The Infinity TCX 840 family of intelligent, programmable stand-alone controllers offers versatility in Direct Digital Control of package units, VAV boxes and other terminal unit applications. The TCX 840 series (TCX 840, TCX 843, TCX 845 and TCX 846) fea-tures several combinations of universal inputs, an on-board pressure transducer, Form A, Tri-state and analog outputs for flexible control configurations.

Choose the TCX 840 model with the I/O configuration that meets your specific needs. The basic two-output TCX 840 model provides low-cost cooling-only VAV control. The TCX 843, with two additional outputs, is perfect for VAV applications requiring reheat control. With separate outputs for fan and staged heating and cooling control plus additional analog outputs for economizer control, the TCX 845 and TCX 846, as full-feature models, provide the perfect solution for packaged unit control.

Metal oxide varistors and optocouplers provide 2500V isolation on each triac-based output on all TCX 840 models to ensure noise-free operation and virtually eliminate the need to install MOVs in the field.

The Infinet’s true peer-to-peer communications protocol provides the Infinity TCX 840 series with the ability to instantly communicate with an Infinity network controller such as the CX 9200, as well as the entire network of Andover Infinet field controllers. Up to 254 TCX 840 series controllers can be networked to one CX series network controller.

www.PDF-Zoo.com

2 Andover Controls Corporation

TCX 840 Series Characteristics

The TCX 840 Series consists of four models that have varying characteristics. The following table lists the features included per model:

Model Outputs Inputs Airflow Sensor

TCX 840 2 Form A 2 Universal 1 (0-1” W.C.)or 1 Form K Tri-state

TCX 843 5 Form A 2 Universal 1 (0-1” W.C.)or 2 Form K Tri-state

TCX 845 5 Form A 4 Universal Noneor 2 Form K Tri-state2 Analog (0-10V)

TCX 846 5 Form A 4 Universal 1 (0-1” W.C.)or 2 Form K Tri-state2 Analog (0-10V)

What You Received

After unpacking the unit, take care to not damage the packaging material—you must reuse it if you ship the product back for repair.

Parts Included with the TCX 840 SeriesTCX 84X Controller5-micron Ramay Filter (not included with TCX 845)Hardware Reference Manual (this document)

www.PDF-Zoo.com


Mechanical Installation

Attach the TCX 840 Series chassis using standard No. 6 screws through the pre-drilled holes in the four corners of the base plate as shown below:

Important!

The Controller must be encased in a UL listed cabinet to keep its Open Class rat-ing. Never drill holes in the chassis or the PC board. A metal shaving could easilyshort circuit the electronics.

The diagram illustrates the overall dimensions of the Controller package and the location of each of the four corner screw holes.

7.13” (181.1 mm)

5.75” ( 146.1 mm)

8.50” (215.9 mm)

6.50” (165.1 mm)

MountingHoles

www.PDF-Zoo.com


Chassis Road MapThe following diagram indicates the locations of each of the main connection points and includes indicator and battery locations:

Airflow Sensor

UniversalInputs

Analog Outputs

24VAC Power

Digital Outputs

Infinet Connection

External BatteryService PortCPU LEDRestart button

www.PDF-Zoo.com

Power Connections


Power ConnectionThe TCX 840 Series controllers are operated via an external 24 Volt AC source. An internal power converter creates the necessary DC voltages to supply the microprocessor circuitry.

Should the AC source be interrupted during operation, backup power for the internal controller state memory is provided by a coin-style 3 Volt Lithium battery. This battery can maintain backup status for typically 3-years.

Battery Connection & Replacement

During shipment, an insulating plastic tab is inserted under the clip on the battery to prevent it from draining prior to installation. To activate the battery, remove this tab.

Should it become necessary to replace the battery, the printed circuit board must be removed from the chassis. This is accomplished by removing six Phillips-head screws from the rear of the chassis. The battery is placed in a coin-style holder. The battery used in the TCX840 Series is a type CR 1225, 38 mAhr 3.0 V primary Lithium battery. See Warnings on next page.

In applications where more backup time is necessary, an external battery of larger capacity may be connected to the controller. The external 3 - 3.6 volt Lithium battery connection con-sists of a keyed Berg-type connector. The three-pin header is located at the bottom of the chassis as illustrated below.

CPU

EXT

BAT

SERV

PORT

Battery is locatedunder here.

CPU

EXT

BAT

SERV

PORT

+ -External3 Volt LithiumBattery

Connect the battery here.

www.PDF-Zoo.com

Power Connections


24 VAC ConnectionThe TCX 840 Series is powered by an external 24 VAC source. This power supply is con-nected via three terminals located at the upper right area of the chassis. The unit should receive power from its own independent, 24 VAC +10% /– 15%, 50 or 60 Hz, 10 VA, unswitched circuit.

The 24 VAC connection consists of both terminals from the secondary of a power-line to 24 VAC transformer and a common ground line. Connection to the Controller is through push-on quick-disconnect type connectors.

WarningsMake sure that 24 VAC is not connected to the power cable while you are wiringthe controller, or you could receive an electrical shock that is life-threatening.

There is danger of explosion if the Lithium battery is incorrectly replaced.

Replace the battery with the same or equivalent type recommended in the text on the previous page. Dispose of used batteries according to manufacturer’s instructions.

24V HOT

24V NEU

OUT6

RET

OUT7

RET

Black

White

HOT

NEUTRAL

GND

AC POWER24 VAC, 10 VA

Black

White

GND X1

X2

AC LinePower

Optional 39V Varistorfor extremely noisy environments

24 VAC Step-DownTransformer

www.PDF-Zoo.com

Power Connections


Building Ground RequirementsBe sure that all equipment from Andover Controls is grounded to true Earth ground. True Earth ground protects the equipment from transients and other power surges in the area. We cannot guarantee that the controller system will operate as documented without a properly grounded installation.

An example of a sub-standard ground is a galvanized steel cold water pipe. As the pipe cor-rodes, it does not act as a true ground. The corrosion acts as an insulator, raising the potential of the pipe with respect to the ground.

When lightning strikes in the area of the installation, it drastically changes the potential of the Earth. Since properly grounded Andover Controls units respond to changes in potential more rapidly than poorly grounded electrical systems, a poorly grounded building tries to reach ground through the Andover Controls system. The surge of current can destroy electronic components on the controller board. Surges of much lower potential than lightning also impact the reliability of the equipment.

Inspecting the GroundBe sure to have your grounds inspected before you begin the installation process to be sure your municipality follows the National Electrical Code. Many municipalities do not follow the code and often have substandard electrical grounds.

Check your ground as follows:

Inspect the building power distribution panel for Earth-ground termination. If the ground termi-nation is any of the following, it is not adequate and must be corrected:

• Does not exist.

• Is connected to a corroded or galvanized pipe.

• Is connected using a small gauge wire (less than 14 AWG).

Be sure your Andover Controls cabinet is connected to the ground with a copper conductor that terminates at the distribution panel.

Lightning ProtectionAlthough metal oxide varistors are built into the board to protect against power line transients, this protection is not sufficient to protect against lightning. Lightning arresters are required at each point where Infinet cables enter or exit a building. The following lightning arrester is rec-ommended:Andover Controls # 01-2100-299, Two pair gas tube lightning arrester

www.PDF-Zoo.com

Infinet Connections


Infinet Network ConnectionThe TCX 840 Series controllers include an interface to the Andover Controls proprietary Infi-net network. Connection to the Infinet allows multiple controllers to communicate and be con-trolled by a larger “host” controller.

Connection to the Infinet requires access to an Infinet network cable. This cable consists of two wires and a shield. A screw-type terminal block Infinet connector is provided at the bottom of the chassis.

To wire the Controller to the Infinet, follow the steps below:

1. Trim the outer jacket of the Infinet cable to reveal the internal wires.

2. Strip the insulation from the white* wire and loosen the screw labeled ‘+’

3. Insert the stripped end of the white* wire into the ’+’ receptacle of the terminal block. Tighten the screw.

4. Strip the insulation from the black* wire and loosen the screw labeled ‘-’

5. Insert the stripped end of the black* wire into the ’-’ receptacle of the terminal block. Tighten the screw.

6. Insert the shield wire into the ‘SHIELD’ receptacle of the terminal block. Tighten the screw.

* Wire colors are included for clarity. The colors of your cable may vary. However, make sure that all Infinet con-nections are consistent on their connections.

CPU

EXT

BAT

SERV

PORT

Connect the InfinetHere.

SHLD

BlackWhite

White Shield

INFINETINFINET

+ - SHIELD

www.PDF-Zoo.com

Input Connections


Input ConnectionsThe TCX 840 Series controllers include varied amounts of inputs. The chart below outlines the input types available per family model.

Model Input Types

TCX 840 2 Universal Inputs




Universal InputsThe TCX 840 Series includes Andover Controls Universal Inputs that are unique in that they are software configurable to handle any one of a number of input types:

ThermistorVoltageDigital/Counter

Input WiringThe actual input terminations are located in the upper left of the chassis. Connection is via a 0.250” (6.35 mm) male spade lug.

The inputs are labeled IN1, IN2, IN3, and so forth. Each pair of inputs is followed by a connec-tion labeled RET for the input signal return, resulting in a sequence of IN1, RET, IN2, RET, and so on. For any given input, you should use the return terminal after that input—the next return terminal goes with the next input, and so on.

IN1

RET

IN2

RET

IN3

RET

IN4

RET

IN1

RET

IN2

RET

IN3

RET

IN4

RET

UNIVERSAL INPUTS

Connect Inputs Here

www.PDF-Zoo.com

Input Connections


Wiring ConcernsDo not remotely ground any part of the sensor wiring. Remote grounds connected to the TCX 840 return terminal could make the controller operate incorrectly or damage the equipment. The signal return is not true earth ground. It is an electronic reference point necessary to inter-pret the sensor properly.

It is recommended that you run input wiring in a conduit separate from AC power or output wir-ing and avoid long wiring runs.

For reliable input operation, follow these input wiring guidelines:

Never lay wires across the surface of the printed circuit board.

Wires should never be within 1 in. or 25 mm of any component on the printed circuit board.

Use shielded input wire.

Terminate the shield of the input wires at one end of the run only—preferably at the end where your controller is located.

Be careful when stripping wire not to drop small pieces of wire inside the cabinet.

Don’t run your input wiring in the same conduit with AC power.

Don’t run your input wiring in the same conduit with your output wiring.

CautionDo not externally ground any input connected to the Controller. This may damage the unit. Signal return terminals are not connected to Earth Ground.

Thermistor Inputs

The TCX 840 Series inputs may be configured to sense temperature by connecting a resistive thermistor to any one of the input terminals. The following is a schematic representation of the connection:

One lead connects to the numbered input terminal, the other to a return terminal.

CautionNever apply a voltage to a thermistor—doing so alters the thermistor’s accuracy and reliability. In fact, it’s a good idea to replace any thermistor that has had any sort of voltage applied to it.

IN1 (Input point 1)

RET (return)

Thermistor

www.PDF-Zoo.com

Input Connections

TCX 840 Family Installation Gui de 11

Special Factors for Thermistors

To keep thermistor errors minimal, limit the length of wire runs to the maximum for the gauge wire you select.

The following three tables indicate the maximum length runs for wires of various gauges to keep errors within certain temperature limits when using thermistor elements.

Wire Gauges a nd Co rrespondi ng Maximum Runs for Sensi ng Temperatures Up to 70 °F (21°C)

Wire Gauges and Corr espon ding Maximum Runs f or Sensing Temperatures Up t o 100 °F (38°C)

Gauge 1/2° F (.28° C) Error 1/4° F (.14° C) Error 1/10° F (.06° C) Error

#142.5 mm2

26,700 ft8150 m

13,300 ft4000 m

5,300 ft1600 m

#161.5 mm2

16,700 ft5120 m

8,300 ft2500 m

3,300 ft1000 m

#181.0 mm2

10,500 ft3200 m

5,200 ft1600 m

2,100 ft640 m

#200.5 mm2

6,600 ft2000 m

3,300 ft1000 m

1,300 ft400 m

#220.35 mm2

4,100 ft1250 m

2,000 ft600 m

800 ft250 m


#142.5 mm2

12,600 ft3800 m

6,300 ft1900 m

2,500 ft760 m

#161.5 mm2

7,900 ft2400 m

3,900 ft1200 m

1,500 ft450 m

#181.0 mm2

5,000 ft1500 m

2,500 ft760 m

1,000 ft300 m

#200.5 mm2

3,100 ft950 m

1,500 ft450 m

600 ft180 m

#220.35 mm2

1,900 ft580 m

900 ft275 m

300 ft90 m

www.PDF-Zoo.com

Input Connections


Wire Gauges and Corr espond ing Maximum Runs f or Sensi ng Temperatures Up t o 150 °F (65°C)

Thermistor Input Specifications

Range –30 to 230 °F(–34 to 110 °C)

Accu racy (Using an Andover Controls Thermistor)

+/– 1 °F over a 10 °F to 150 °F range+/– 0.55 °C over a –23.3 to 65.5 °C range


#142.5 mm2

4,100 ft1250 m

2,000 ft600 m

800 ft240 m

#161.5 mm2

2,600 ft800 m

1,300 ft400 m

500 ft150 m

#181.0 mm2

1,600 ft500 m

800 ft240 m

300 ft90 m

#200.5 mm2

1,000 ft300 m

500 ft150 m

200 ft60 m

#220.35 mm2

600 ft180 m

300 ft90 m

100 ft30 m

www.PDF-Zoo.com

Input Connections


Voltage Inputs

The TCX 840 Series inputs may be configured to sense voltage by connecting the input termi-nals to a voltage source. The following is a schematic representation of the connection:


Voltage Input Specifications

Voltage Range 0 to 5.115 V

Reso lution 0.005 V

Accu racy +/–0.015 V

Inpu t Impedance 10KΩ referenced to 5.120 V

Filtering Corner Frequency at 15 Hz, –20 db/decade

Calibration Permanent (factory)

Digital/Counter Inputs

The TCX 840 Series inputs may be configured to sense a contact closure by connecting the input terminals to a digital or counter input source. The following is a schematic representation of the connection:


Digital/Counter Input Specifications

Inpu t Type Contact Closure

Maximum Pulse Frequency 4 Hz at a duty cycle of 50%

Pulse Width 125 ms minimum

IN1 (Input point 1)

RET (return)

V

+

-

IN1 (Input point 1)

RET (return)

www.PDF-Zoo.com

Air Flow Sensor Connections


Air Flow Sensor ConnectionSome TCX 840 Series controllers include an airflow sensor. The chart below indicates the models that include this capability.

Models with Air Flow Sensors

TCX 840 TCX 843 TCX 846

The air flow sensor is located at the top of the Controller chassis:

The following steps explain the connection of the air flow sensor:

1 Remove both of the rubber connection protectors from the air flow sensor.

2. Using a small piece of 1/4” (6.35 mm) O.D. tubing, attach the ‘OUT’ side of a 5 micron filter to the P1 connection of the sensor.

3. Connect a 1/4” O.D. tube from the other end of the filter (the side marked ‘IN’) to the ‘HI’ opening on a VAV box.

4. Connect a 1/4” O.D. tube from the P2 connector of the air flow sensor to the ‘LO’ opening on a VAV box.

Note: Keep tubing to a maximum of 15 inches (380.99 mm) in length.

Air Flow Input Specifications

Range 0 to 1” WC (0-249 Pa)

Reso lution 0.005” WC (1.25 Pa) @ 73 °F (23 °C) @ Standard Air Conditions

Accu racy +/– 0.05” WC (12.5 Pa) @ 73 °F (23 °C) @ Standard Air Conditions

AIRFLOW INPUT

OUT (LOW) IN (HIGH)

Side marked‘IN’ Here

Filter

www.PDF-Zoo.com

Output Connections


Output ConnectionsThe TCX 840 Series controllers include varied amounts of Triac and Analog outputs. The chart below outlines the output types available per family model.

Model Triac Output Types

TCX 840 2 Form A or 1 Form K Tri-state

TCX 843 5 Form A or 2 Form K Tri-state

TCX 845 5 Form A or 2 Form K Tri-state, 2 Analog

TCX 846 5 Form A or 2 Form K Tri-state, 2 Analog

Output WiringThe actual output terminations are located along the right side of the chassis. Connection is via a 0.250” (6.35 mm) male spade lug.

Switching Loads with TriacsAlthough the Triac-based outputs provided with this unit appear as relay contacts in the sche-matics provided, they are actually solid-state switches that have limitations on the loads they can switch.

AC vs. DCThe first limitation is that they cannot be used with DC loads. A Triac switches AC only.

Minimum Load CurrentThe second limitation involves the minimum load current. In order for the Triac to switch it must d etect at least 30 m a of cu rren t from the load . If your load is less than 30 ma you can induce the required load by connecting a resistor across the load (not directly at the Triac!). Check the current draw specification on your field device, and if it does not meet this minimum, add a resistor in parallel with the device being driven sized to achieve the minimum loading. Use the following formulas to determine resistance and wattage:

Resistance (ohms) = Voltage Power (Watts) = (Voltage) 2

Current Resistance

OUT5

OUT4

OUT3

OUT2

DIGITAL OUTPUTS24VAC, 1A MAX

OUT1

OUT5

OUT4

OUT3

OUT2

OUT1

www.PDF-Zoo.com

Output Connections


Form A Outputs

Each member of the TCX 840 Series includes several Triac-based Form A outputs. The fol-lowing is a schematic representation of the connection:

When the output is activated, the connection between the ‘C’ and ‘NO’ terminals becomes a virtual short circuit. Using the Form A connection you can control anything that would normally be controlled (within specifications) via a switch or relay contact closure.

Form K Tri-state Outputs

Two Form A outputs can be connected to provide one Form K Tri-state output. OUT1 and OUT2 or OUT3 and OUT4 can be configured as tristate outputs.

The following is a schematic representation and the actual wiring of the connection:

Note that all tristate outputs fail in the OFF state if there is no power. They are forced to the OFF position for 2 minutes upon reset or powerup before being program controlled.

Form A and Form K Output Specifications

Current 1 A @ 24VAC Resolutio n 0.1 sec for PWM

C

NO

C

+ON

–ON

OUT 2

OUT 1+ON

C

–ON

www.PDF-Zoo.com

Output Connections


Analog Outputs

Some TCX 840 Series controllers include analog output capability. The chart below indicates the models that include this capability.

Models with Analog Outputs

TCX 845 TCX 846

The analog output connections are located at the top right of the Controller chassis. The fol-lowing is a schematic representation and the actual wiring of the connection:

Analog Output Specifications

Range 0 to 10.00 V

Reso lution 0.05 V

Accu racy +/– 0.10 V

Current 5 mA maximum

OUT6

RET(return) –

+

RL >= 2K

24V HOT

24V NEU

OUT6

RET

OUT7

RET

HOT

NEUTRAL

GNDGND

Analog Outputs0-10V, 5mA MAX

OUT6

RET

OUT7

RET

Load

www.PDF-Zoo.com

Operation


OperationThe TCX 840 Series controllers are designed to be programmed by an external source. Their program is set up via a CX 9XXX controller over the Infinet network. Therefore, programmers should refer to the CX Programmer’s Guide for specific information regarding operation.

I/O Point Assignments

The TCX 840 Series can be programmed using the following point assignments:

Function Input Point Assignment Electrical TypeTCX 840 TCX 843 TCX 845 TCX 846

Universal Input 1 1 1 1 1 * see note 1Universal Input 2 2 2 2 2 * see note 1Universal Input 3 3 3 * see note 1Universal Input 4 – – 4 4 * see note 1

Airflow Sensor Input 7 7 – 7 Voltage

Function Output Point Assignment Electrical TypeTCX 840 TCX 843 TCX 845 TCX 846

Output 1 1 1 1 1 Digital, Tri-StateOutput 2 2 2 2 2 DigitalOutput 3 3 3 3 Digital, Tri-StateOutput 4 4 4 4 DigitalOutput 5 5 5 5 Digital

* Note 1: valid E-Types are VoltageACC_TEMP_DEGFACC_TEMP_DEGCDigitalCounter

Service ToolAccess is provided to the controller via the Andover Controls lap-top service tool. A special port is provided at the bottom of the chassis where a service tool adapter cable may be wired. This adapter cable converts the separate wires connected to the TCX unit into the standard RJ11 connector used by the service tool.

Connection of the service port adapter cable is through a 4-pin Berg-type connector.

Pre-Operation Checks1 Make sure the internal battery is present or the external battery is connected.

2. Make sure the 24VAC power is wired properly. Check to be sure all three wires have been connected.

www.PDF-Zoo.com

Operation


3. Make sure the controller has a true earth ground.

4. Make sure you have used the proper cables and wires at correct lengths.

5. Make sure the Infinet cable has been properly wired.

6. Make sure the Infinet cable shields are properly connected.

Initial Power-Up1 Enable the AC power source (or close the power connection). The controller starts auto-

matically. The following occurs (also occurs when you press the RESET button):

2. If the controller has been off, outputs remain off. If you have pressed RESET, outputs turn off.

3. The CPU light flashes every quarter second. There is a distinguishable off time.

4. If the CPU light flashes very fast (no distinguishable off time), the CPU has failed an inter-nal test. In this case, recheck your connections and contact your Andover Controls repre-sentative.

www.PDF-Zoo.com

Troubleshooting


Troubleshooting

With any electronic device it is possible that the unit may enter a confused or non-operational state depending upon unexpected outside stimulus. The following is a guide to follow should you decide the unit is not functioning properly:

CPU LED Is Not BlinkingIf the CPU LED is not blinking then the unit is not operating. This could be due to the loss of pri-mary AC power or other internal disfunction.

• Check that 24VAC is available and connected properly to the power terminals.This can be done using a multimeter reading the voltage across the 24V HOT and 24V NEU terminals.

• If power appears to be OK, remove power and all other connections from the unit. Un-mount the unit from its rack. Turn the unit over and remove the six Phillips screws that hold the printed circuit board in-place. Remove the power fuse and check it for continuity with an Ohm meter. If the fuse is blown, replace it with a similar 2 Amp picofuse (it resides in a socket). After replace-ment, take care that the board is refastened to the chassis properly before re-mounting the chassis to the rack or other enclosure.

24V HOT

24V NEU

OUT6

RET

OUT7

RET

GND

2 Amp, 125Vpicofuse

www.PDF-Zoo.com

Troubleshooting


Unit Appears Functional But Is Not Responding To CX ControllerIf the CPU LED is blinking normally chances are that the unit is operational. However, in that the TCX 84X is a programmable unit, it is possible that there is a programming problem. Try attaching an Andover Controls Lap-Top Service Tool to determine the source of the problem.

One Input or Output Appears to Be DysfunctionalIf the CPU LED is operating and other inputs/outputs are operating properly there could be two reasons for the failure:

• The Input or Output has been damaged. In this case contact an Andover Controls representa-tive for assistance.

• If this is the first time using the controller, perhaps the program controlling the input/output is not correct. Re-check your program.

www.PDF-Zoo.com

Sample Applications


Sample Applications

The following two illustrations detail the connections to a simple VAV Box.

The first application is a cooling-only scenario. It shows the connections for the Air Flow sensor and the creation of a tri-state output to control the VAV Box. External varistors are shown in appro-priate locations.

COM

OPEN

CLOSE

AIR

FLOW

HI

LO

V A V Box

OUT1

OUT2

IN

P1

P2 Air Flow

HOT

NEUTRAL

GND

X2

X1

TCX 840 TCX 843 TCX 846

Ramay Filter (Note Direction)

0.250 " tubing

AC Mains

This connection: see Note Optional

39V Varistors*

Optional 39V Varistors*

24V Step-Down Transformer

See Note

Note: If the installation requires the secondary of the 24V transformer to be grounded,always connect the “neutral” to ground and only ground it at the transformer.

* These varistors would be added only in very noisy environments.

The GND terminal on the TCX 840 is internally connected to the NEUTRAL connection.

www.PDF-Zoo.com

Sample Applications


The second application shows a VAV Box with re-heating capability. Another output controls the relay that activates the heating unit

* These varistors would be added only in very noisy environments.

COM

OPEN

CLOSE

HI

LO

V

A

V Box

OUT1

OUT2

IN

P1

P2 Air Flow

HOT

NEUTRAL

GND

X2

X1

TCX 840 TCX 843 TCX 846

Ramay Filter (Note Direction)

0.250 " tubing

AC Mains

This connection: see Note Optional

39V Varistors*

Optional 39V Varistors*

24V Step-Down Transformer

Electric Reheat

AIR

FLOW

COM

Stage 1

Relay

OUT3

Optional 39V Varistor*

(Across Relay Coil)

See Note

Note: If the installation requires the secondary of the 24V transformer to be grounded,always connect the “neutral” to ground and only ground it at the transformer.The GND terminal on the TCX 840 is internally connected to the NEUTRAL connection.

www.PDF-Zoo.com


www.PDF-Zoo.com

TCX 840 Family Installation Guide Index-1

Numerics

24 VAC Connection 6

A

AC Connection 6air filter 14Air Flow Input Specifications 14Air Flow Sensor Connection 14Analog Output Specifications 17Analog Outputs 17

B

battery capacity 5Battery Connection 5Battery Replacement 5Building Ground Requirements 7

C

chassis removal 20Chassis Road Map 4circuit requirements for power 6contact closure sensing 13Counter Inputs 13CPU LED 20

D

Digital/Counter Input Specifications 13Digital/Counter Inputs 13

E

Earth Ground 7enclosure

UL requirements 3external battery 5external power connection 6

F

family characteristics 2Form A Outputs 16Form K Tri-state Outputs 16fuse 20

GGround Inspection 7Ground Requirement 7

IIN1 9Infinet

lightning arrester for 7Initial Power-Up 19Input Wiring 9Input, air flow 14input/output chart 2Inputs 9Inputs, Thermistor 10Inputs, Voltage 13Inspecting the Ground 7installation, mechanical 3introduction 1

Llap-top service tool 18lightning

protection against 7lightning arrester

for Infinet 7Lightning Protection 7line transients

protection against 7Lithium battery 5

Mmain components 4male spade lug 15measuring air flow 14Mechanical Installation 3minimum Triac load current 15mounting 3

NNetwork Connection 8

OOperation 18

www.PDF-Zoo.com

Index-2 Andover Controls Corporation

Output Connections 15Output Wiring 15Output Wiring Concerns 15Output, Form A 16Output, Form K 16Output, Tri-State 16

PParts Included 2physical layout 4picofuse 20Power Connection 5Power-Up 19protection

against lightning 7against line transients 7

Protection, Lightning 7

R

Ramay air filter 14remove chassis 20resistive thermistor 10RET 9

SSample Applications 22screw holes

locations for mounting 3sense temperature 10sensors

thermistor 11Service Tool 18shipping inventory 2spade lug 15Special Factors for Thermistors 11

TTCX 840 Series Characteristics 2temperature connection 10Thermistor Input Specifications 12Thermistor Inputs 10Thermistor Wire Gauges 11thermistors

reducing errors 11

transformer connection 6Tri-state output 16Triac, switching loads 15Troubleshooting 20

UUnderwriter Laboratoriesenclosure requirements 3Universal Inputs 9

VVoltage Input Specifications 13Voltage Inputs 13

WWhat You Received 2Wiring Concerns 10Wiring, Inputs 9

www.PDF-Zoo.com

www.PDF-Zoo.com

30-3001-493 Version D

www.PDF-Zoo.com

TCX 840 - Fire Alarm...

Documents

Transcript of TCX 840 - Fire Alarm...