Duty/Standby Starter; Description; Mm2 Sequences - GE MOTOR MANAGER 2 Instruction Manual

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9 STARTER TYPES

9.12 DUTY/STANDBY STARTER

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

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.

GE Power Management

MM2 Motor Manager 2

9.12 DUTY/STANDBY STARTER

9-35

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