Mm2 Sequences - GE MOTOR MANAGER 2 Instruction Manual

9.4 SLIP RING STARTER
START sequence:
1. The start command is received by the MM2 (serial, switch input, or faceplate).
2. Close and maintain Contactor A relay – the motor is now starting with the secondary resistors in
circuit.
3. Wait STAGE ONE SHORTING TIME delay.
4. Close and maintain Contactor B relay – the motor is now running with the secondary resistors
shorted out.
STOP/TRIP sequence:
1. Stop command received by the MM2 or a trip occurs.
2. Open Contactor A and B output relays.
When the power to the MM2 is interrupted, all output relays on the MM2 will de-energize causing
them to open and stop the motor. The MM2 can only be wired for fail-safe operation.
If feedback is not received from the S or R contacts to the Contactor A or B Status N.O. inputs within
one second of closing Contactor A or B output relays, an OPEN CONTROL CIRCUIT alarm will
occur. This will cause Contactor A and B output relays to open. If feedback remains at the Contactor
A or B Status N.O. input more than one second after opening the Contactor A or B output relays, a
WELDED CONTACTOR alarm will occur.
9
9-12 MM2 Motor Manager 2
9 STARTER TYPES

9.4.2 MM2 SEQUENCES

GE Power Management