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9.13 SOFT STARTER
9.13 SOFT STARTER
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 MM3 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 MM3 sequence below for details on functionality.
START:
1. Start command received by the MM3 (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 second of clos-
ing 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 Con-
tactor B Status N.O. feedback remains at the MM3 after the RAMP DOWN TIME has expired during a stop, a
DRIVE FAILED TO STOP alarm will be generated.
9
If feedback remains at Contactor A Status N.O. input more than 1 second after opening the Contactor A output
relay, a WELDED CONTACTOR alarm occurs. If feedback remains at the Interlock configured 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.
9-36
MM3 Motor Manager 3
9 STARTER TYPES
9.13.1 DESCRIPTION
9.13.2 MM3 SEQUENCE
GE Power Management
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