GE Power Management
MM2 Motor Manager 2 9-35
9 STARTER TYPES 9.12 DUTY/STANDBY STARTER
9
9.12 DUTY/STANDBY STARTER 9.12.1 DESCRIPTION
This starter type is a full voltage starter and allows a single MM2 to control two identical motors. This
starter type has two modes, manual and automatic. In manual mode a switch input determines which
of the two motors is available for operation. In automatic mode the MM2 selects which motor should
run based on the number of starts performed. An even number of starts will start motor A and an odd
number will start motor B.
To program the MM2 for duty/standby starter, set:
S1 CONFIGURATION\STARTER\STARTER TYPE: DUTY/STANDBY
S3 PROCESS\PROGRAMMABLE INPUTS\INTERLOCK INPUT 1: DUTY SELECT MAN/AUTO
S3 PROCESS\PROGRAMMABLE INPUTS\INTERLOCK INPUT 2: MOTOR SELECTOR A/B
9.12.2 MM2 SEQUENCES
START (manual) sequence:
1. Duty Select MAN/AUTO open.
2. Motor Selector A/B open.
3. Start A command received by the MM2.
4. Close Contactor A relay – Motor A is now running.
5. Stop command.
6. Motor Selector A/B closed.
7. Start A command received by the MM2.
8. Close Contactor B relay – Motor B is now running.
START (auto) sequence:
1. Duty Select MAN/AUTO closed.
2. Motor Selector A/B has no effect.
3. Start A command received by the MM2 (number of starts = 0, even).
4. Close Contactor A relay – Motor A is now running.
5. Stop command.
6. Start A command received by the MM2 (number of starts = 1, odd).
7. Close Contactor B relay – Motor B is now running.
STOP/TRIP sequence:
1. Stop command received by the MM2 or a trip occurs.
2. Open the active contactor A or B.
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