Mm2 Sequences - GE MOTOR MANAGER 2 Instruction Manual

9.10 WYE-DELTA OPEN TRANSITION STARTER
START sequence:
1. Start command received by the MM2 (serial, switch input or faceplate).
2. Close Contactor A output relay – the motor is now in a wye configuration.
3. Close Aux. output relay 1M contact.
4. Maintain 1S contactor until CHANGE OVER CURRENT or CHANGE OVER TIME initiates a transition from
wye to delta. See CHANGE OVER CURRENT and CHANGE OVER TIME descriptions above for more
detail.
5. Open Contactor A output relay – change over delay 20 ms wye to delta.
6. Close and maintain Contactor B output relay – the motor is now in a delta configuration.
STOP/TRIP sequence:
1. Stop command received by the MM2 or a trip occurs.
2. Open contactor B output relay.
3. Open Aux. output relay 1M contact
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 Contactor A Status N.O. input within one second of closing Con-
tactor A relay, an OPEN CONTROL CIRCUIT alarm will occur. This will cause All starter output
relays to open. If feedback remains at the Contactor A Status N.O. input more than one second after
opening the Contactor A output relay, a WELDED CONTACTOR alarm will occur.
If feedback is not received from the Contactor B Status N.O. input within one second of closing Con-
tactor B relay, an OPEN CONTROL CIRCUIT alarm will occur. This will cause All starter output
relays to open. If feedback remains at the Contactor B Status N.O. input more than one second after
opening the Contactor B output relay, a WELDED CONTACTOR alarm will occur.
If feedback is not received from the Wye Delta 1M contact interlock input within one second of clos-
ing Contactor A relay, an OPEN CONTROL CIRCUIT alarm will occur. This will cause All starter out-
put relays to open. If feedback remains at the Wye Delta 1M contact interlock input more than one
second after opening the AUX. output relay, a WELDED CONTACTOR alarm will occur.
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9-30 MM2 Motor Manager 2
9 STARTER TYPES

9.10.2 MM2 SEQUENCES

GE Power Management