GE Power Management
MM2 Motor Manager 2
9-21
9 STARTER TYPES
9.7 AUTOTRANSFORMER OPEN TRANSITION STARTER
9
S3 PROCESS\PROGRAMMABLE INPUTS\INTERLOCK INPUT 10:
AUTOTRANS 2S CONTACT
S4 CONTROL\AUX 1 RELAY CONFIG\AUX RELAY 1 FUNCTION:
AUTOTRANSFORMER 2S
The
CONTACTOR SEQUENCE
setpoint appears when
STARTER TYPE
is selected as
AUTOTRANS OPN
TRANS
. The
1S-2S
value closes the 1S contactor ahead of the 2S contactor as per some manufac-
turer’s wiring practices. The
2S-1S
value closes the 2S contactor ahead of the 1S contactor, another
common wiring practice.
The
CHANGE OVER TIME
setpoint appears when
STARTER TYPE
is selected as
AUTOTRANS OPN TRANS
.
This represents the time delay from the closure of Contactor A until the opening of Contactor A.
The
STARTS PER HOUR
setpoint appears only when
STARTER TYPE
is selected as
AUTOTRANS OPN
TRANS
. This setpoint limits the number of starts per hour to prevent overheating of the autotrans-
former windings.
9.7.2 MM2 SEQUENCES
START (
CONTACTOR SEQUENCE
set to
1S-2S
) sequence:
1. Start command received by the MM2 (serial, switch input or faceplate).
2. Close and maintain Contactor A output relay – close 1S contactor.
3. Wait 20 ms, close and maintain Aux. 1 output relay – power is applied to the autotransformer.
4. Wait for the time set in the
CHANGE OVER TIME
setpoint.
5. Open Contactor A and Aux. output relays.
6. Wait 20 ms.
7. Close and maintain Contactor B output relay.
START (
CONTACTOR SEQUENCE
set to
2S-1S
) sequence:
1. Start command received by the MM2 (serial, switch input or faceplate).
2. Close and maintain Aux. 1 output relay – power is applied to the autotransformer.
3. Wait 20 ms, close and maintain Contactor A output relay – close the 1S contactor.
4. Wait for the time set in the CHANGE OVER TIME setpoint.
5. Open Contactor A and Aux. output relays.
6. Wait 20 ms.
7. Close and maintain Contactor B output relay.
STOP/TRIP sequence:
1. Stop command received by the MM2 or a trip occurs.
2. Open Contactor B output relay.
If feedback is not received from the 1S, 2S or R contacts to the Contactor A, B or auxiliary relay Sta-
tus N.O. inputs within one second of closing Contactors A, B or the auxiliary relay, an OPEN CON-
TROL CIRCUIT alarm will occur. This will cause Contactors A, B and the auxiliary relay to open.
If feedback remains at any of the Status N.O. inputs for more than one second after opening the its
respective relay, a WELDED CONTACTOR alarm will occur.
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