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10 CONTROL WIRE APPLICATIONS
This control scheme is used when it is desirable to operate the starter manually and automatically. In the Hand
position, the starter coil is energized via the START button and de-energized via the STOP button. In the auto
position, the starter is energized automatically when the PLC1 contact is pulsed closed. When the PLC2 con-
tact is pulsed open, the motor stops.
To program the MM3 for three-wire hand / two-wire auto control, set the MM3 to the default settings.
HAND:
•
In the hand position, the motor is available to start.
•
When the START button is pressed, the motor runs.
•
When the STOP button is pressed, the motor stops.
OFF:
•
In the off position, the motor will stop.
AUTO:
•
In the auto position, the motor is available to start.
•
When the PLC contact is pulsed closed, the motor runs.
•
When the PLC contact is pulsed open, the motor stops.
•
When the STOP button is pressed, the motor stops.
Terminal 11 (Stop input) must be closed to allow a start. The MM3 display will read "Motor Status Unavailable"
when the stop input is open.
If feedback is not received by the Contactor A Status N.O. input within one second of closing Contactor A out-
put relay, an OPEN CONTROL CIRCUIT alarm will occur. This will cause Contactor A output relay to open.
GE Power Management
10.2 HAND/OFF/AUTO CONFIGURATION
MM3 Motor Manager 3
10.2.5 3 WIRE HAND / 3 WIRE AUTO
10.2.6 CONTROL OPERATION
10
10-7
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