9-38 MM2 Motor Manager 2
GE Power Management
9.13 SOFT STARTER 9 STARTER TYPES
9
9.13 SOFT STARTER 9.13.1 DESCRIPTION
When the RUN contact closes the soft starter ramps up the motor to the programmed speed. When
the RUN contact opens, the soft starter ramps down the motor to a stop.
To program the MM2 for soft starter, set:
S1 CONFIGURATION\STARTER\STARTER TYPE: SOFT STARTER
S1 CONFIGURATION\STARTER\RAMP UP TIME: 1 to 125 sec.
S1 CONFIGURATION\STARTER\RAMP DOWN TIME: 1 to 125 sec.
S3 PROCESS\PROGRAMMABLE INPUTS\INTERLOCK INPUT 10: BYPASS CONTACT (optional)
S4 CONTROL\AUX RELAY 1 CONFIG\AUX. RELAY 1 FUNCTION: SOFT STARTER BYPASS (optional)
The RAMP UP TIME and RAMP DOWN TIME setpoints appear when STARTER TYPE has been selected as
SOFT STARTER. See the MM2 sequence below for details on functionality.
9.13.2 MM2 SEQUENCE
START:
1. Start command received by the MM2 (serial, switch input or faceplate).
2. Close and maintain Contactor A output relay – provide power to the SOFT STARTER.
3. Wait for one second.
4. Close and maintain Contactor B output relay – signal the SOFT STARTER to start the motor.
5. Wait for the RAMP UP TIME for Contactor B Status N.O. to close.
6. Close Bypass contact AUX. relay (optional)
STOP/TRIP:
1. Stop command is received or a trip occurs (serial, switch input or faceplate).
2. Open contactor B output relay.
3. Open Bypass contact AUX. relay (optional).
4. Wait for the RAMP DOWN TIME for Contactor B Status N.O. to open.
5. When Contactor B Status N.O. reads open, open Contactor A output relay.
If feedback is not received from the 1M contact to the Contactor A Status N.O. input within one sec-
ond of closing Contactor A output relay, an OPEN CONTROL CIRCUIT alarm will occur. This will
cause Contactor A and B output relays to open.
If Contactor B Status N.O. does not receive feedback from the up to speed contact on the SOFT
STARTER within the RAMP UP TIME setpoint during a start, a DRIVE FAILED TO START alarm will
be generated. If Contactor B Status N.O. feedback remains at the MM2 after the RAMP DOWN TIME
has expired during a stop, a DRIVE FAILED TO STOP alarm will be generated.
If feedback remains at Contactor A Status N.O. input more than 1 second after opening the Contac-
tor A output relay, a WELDED CONTACTOR alarm occurs. If feedback remains at the Interlock con-
figured for BYPASS CONTACT more than one second after opening the Aux output relay, a
WELDED CONTACTOR alarm occurs. If feedback is not received from the BYPASS CONTACT
interlock input within one second of closing Aux output relay, an OPEN CONTROL CIRCUIT alarm
occurs. This will cause Contactor A and B output relays to open.
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