Post on 14-Nov-2014
description
Major Components of Motor Drive Controllers
- for -
IEEE-IAS - by -
James S. Nasby
Columbia Engineering
C.E. IEEE-IAS 2
Items to be Covered Power Path Components Line Voltage Components Critical Path Items
C.E. IEEE-IAS 3
Model ECA A-T-L(D-O-L)
I/S
C/B
“M” Contactor
Emergency (Manual) Operator
C.E. IEEE-IAS 4
Model MCP Part
Winding
Current Transformers
Surge Arrestor Fuses
Control Unit
Digital Recorder
Balance Beam Dual Actuator
Motor Contactors "M1" & "M2"
C.E. IEEE-IAS 5
Common Power Path Components I/S: Isolating Switch (Means) C/B: Circuit Breaker (Disconnect Means) Contactor(s)
Running Starting
Current Transformers (Rigidly Mounted -vs- Tie Wrapped to Power Wiring)
Internal Wiring NEC® Table 310.16 -vs- 310.17 Single Hole Lugs -Often up to "F" Frame (217 Amps = 250A /
1.15) Two Hole Lugs "J" (400 amp) Frame and up 90°C or 75°C or 90°C Columns?? U.L. 60°C up to 100 amp & 75 °C @ FLA F.M. 90°C @ 1.25 x FLA E.g.: U.L. Greater < 100A and F.M. >100A
Note: Table 310-17 is for Conductors in Free Air, Not Bundled.
C.E. IEEE-IAS 6
Model ECP Part
Winding
C.E. IEEE-IAS 7
Internal Wiring and Contactor Currents Main = 1.00 x FLA Part Winding = 65% (M1) Reduced = 65% of FLA
Primary Reactor (Start) Primary Resistor (Start) Autotransformer (Start) Soft Start/Stop (Start)
Wye (Wye-Delta) = 57.7% of FLA (M1 & M2) Wye-Delta (Closed) Transition Wiring = 33% W- Closed Transition = FLA/(6x1.414)=11.8%* Wye (Autotransformer) = 25% (Includes Xfmr Saturation Current)
Variable Speed Wiring Bypass. R1 & R2 Contactors = 100% of FLA Link Reactor = Calculate (may exceed 100%)
* Proprietary Information
C.E. IEEE-IAS 8
Other Power Path Components
Transfer Switch 115% FLA Starting Reactors: Rating in FLA or Hp
Primary Reactors Neutral Reactors (Above 4800 Vac)
Note: Starting Reactors support numerous 10 Second starting attempts. Starting Resistors Sizing: Rating in Amps and
Watts Note that these have a limited duty cycle. W- Transition Resistors Sizing: (ditto) Autotransformer: Rated in Hp
Three Coil Two Coil
Soft Starter H.P. Rated? Continuous or Intermittent Duty Rated?
C.E. IEEE-IAS 9
Primary Reactor Transfer Swich Unit Combination Unit (285 FLA)
C.E. IEEE-IAS 10
Other Power Path Components
Variable VFD Fuses (Must be Selectively Coordinated with F.P. Breaker)
Medium Voltage Controllers Motor Fuses ("R" Rated) CPT Primary Fuses ("E" Rated)
Optional Terminal Blocks (UL Listed for Required WIC Rating)
C.E. IEEE-IAS 11
VFD Fuses
C.E. IEEE-IAS 12
Model ECHA"R" Rated
Motor Fuses
C.E. IEEE-IAS 13
Model ECHA Aux. CPT Primary "E" Rated Fuses
C.E. IEEE-IAS 14
Running ContactorsMust Be Sized for Either Motor Horsepower, or sized for the Greater of Running (FLA) Amps -or- Starting Amps
One Main (Run) Contactor: Motor Hp A-T-L & Variable Speed (Hp Rated) Primary Reactor, Resistor, Softstart Autotransformer
Part Winding: M1 & M2 M1 = 65% (Starting) M2 = 50% or 65%
Wye-Delta (W-): M1 & M2 M1 & M2 = 58% (1/3½)
Note: All of these are used for Manual Mechanical Starting.
C.E. IEEE-IAS 15
Starting ContactorsMust Be Sized for the Greater of Running Amps -or- Starting Amps
A-T-L & Variable Speed (Hp Rated) Part Winding (See Running) Resistor/Reactor/Soft Start = 65% W-
Wye = 33% FLA & LRC Tansition = FLA/(6x1.414)=11.8%*
A.T. Wye = 25% (Includes Xfmr Saturation Current)
* Proprietary Information
C.E. IEEE-IAS 16
Line Voltage Components All Power Path Components Control Power Transformers (CPT's)
Critical Path (Two or Three) Auxiliary Stepdown Transformers
• Cabinet Heaters, Aux. Power, Etc. Surge Arresters Sensors or Modules (Phase Rotation, etc.) Shunt Trip Circuitry & Coil** Note: Not all controllers protect against failures of any of
the three phases. Some provide no motor or controller or conductor protection if either L1 or L2 are lost, particularly with Manual Operator or welded contactor.
C.E. IEEE-IAS 17
Surge Arresters Most are NOT fused (coordination needed along
with higher voltage withstand ability). Many Still Connected on Service Terminals (I/S
Line Side Terminals) Special Option needed for:
Corner Grounded Delta Corner Grounded Wye Ungrounded Systems (Common in process plants to
permit first ground fault without shutting down the process - resulting in a Corner Ground System.)
Only one Mfr. Has UL/FM Option
C.E. IEEE-IAS 18
EC-LC Line Voltage Chassis,S/A Fuse Cover, Shop Current Test Cables
C.E. IEEE-IAS 19
Controllers Rated in Excess of 600 VAlso Called "High" Voltage and "Medium" Voltage*
Isolating Switch Interlocked w/ Contactor -or- Load Break Rated (per UL-347)
Vacuum Contactor Low Chop Motor Type -or- High Chop C/B Type (Suppression Needed)
Fuse Size Rules Door Interlocking Stress Cone Space
"High" Voltage = Old NFPA-20 Designation
"Medium" = Enclosed Switchgear above Low Voltage (600 Vac )
C.E. IEEE-IAS 20
Model ECHAIncoming Bus Bars (Tin Plated)
Shown w/ Shop Current Test Connections
Isolating Switch Stabs
C.E. IEEE-IAS 21
Model ECHAIncoming Bus Bars Cover in Place
C.E. IEEE-IAS 22
Model ECHASwing-outBay PartiallyClosed
C.E. IEEE-IAS 23
Model ECHA Motor Contactor -and- "R" Rated Silver/Sand Motor Fuses
C.E. IEEE-IAS 24
Model ECHA Interlocking
C.E. IEEE-IAS 25
Model ECHAEmergencyMechanicalManualOperator
Quick Make - Quick Break mechanism matches normal electrical operating speeds.
C.E. IEEE-IAS 26
Model ECHA Motor Terminals
C.E. IEEE-IAS 27
Model ECHAIsolatingSwitch
QMB Quick-Make Quick-Break Isolating Switch Mechanism
Includes Four Way Door, Contactor and Handle Interlocking
C.E. IEEE-IAS 28
Fully CoordinatedNote: Contactor is a "Low Chop" type vacuum contactor specifically designed for Motor Applications.
No special cable studies, capacitors or surge arresters required.
Note all Front Top or Bottom Access. Some Mfr's require Rear Access.
C.E. IEEE-IAS 29
Critical Path Items Anything Needed for Automatic Operation Controls
Processor Hardware & Programing Other Electronic Components Relays, Wiring, Connectors, etc.
Timers Lockouts (When Not Wanted) Sensors (False C/B Trip or False Single Phase
Start Protection Circuitry or Phase Reversal Circuitry
Anything that Can Prevent Starting
C.E. IEEE-IAS 30
Door Interlocks
Door Hooks
Interlock Bars
C.E. IEEE-IAS 31
Questions?