9-18 MM2 Motor Manager 2
GE Power Management
9.6 INVERTER STARTER 9 STARTER TYPES
9
9.6.2 MM2 SEQUENCES
START sequence:
1. Start command is received by the MM2. (serial, switch input or faceplate).
2. Close and maintain Contactor A output relay. - provide power to the inverter
3. Wait for one second.
4. Close and maintain Contactor B output relay. - signal the inverter to start the motor.
5. Wait for the RAMP UP TIME for Contactor B Status N.O. to close.
STOP/TRIP sequence:
1. Stop command is received or a trip occurs. (serial, switch input or faceplate)
2. Open contactor B output relay.
3. Wait for the RAMP DOWN TIME for Contactor B Status N.O. to open.
4. 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 1 second
of closing Contactor A output relay, an OPEN CONTROL CIRCUIT alarm occurs. This causes the
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 inverter
within the RAMP UP TIME setpoint during a start, a DRIVE FAILED TO START alarm will be gener-
ated. 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 one second after opening the Con-
tactor A output relay, a WELDED CONTACTOR alarm will occur.
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