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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 by the maintained PLC contact. When the PLC contact opens, the motor
stops.
To program the MM3 for three-wire hand / two-wire auto control, set:
S3 PROCESS\PROGRAMMABLE INPUTS\INTERLOCK INPUT 1: TWO WIRE CONTROL
S3 PROCESS\STOP CONFIGURATION\FACEPLATE STOP: LATCHED
The INTERLOCK INPUT 1 setpoint was chosen to match the wiring diagram provided. Any of the avail-
able Interlocks 1 through 10 could be programmed for TWO WIRE CONTROL.
NOTE
HAND:
•
In the hand position, the motor is available to start.
•
When the START button is pressed, the motor will run.
•
When the STOP button is pressed, the motor will stop.
•
Pressing the
STOP
key causes a latched trip. The motor cannot be restarted until
OFF:
•
In the off position, the motor will stop.
AUTO:
•
In the auto position, the motor is available to start.
•
When the PLC contact closes the motor runs.
•
When the PLC contact opens the motor stops.
•
When the faceplate stop key is pressed, it causes a latched trip. The motor cannot be restarted until reset
is pressed.
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.
In the auto position the STOP push button at the motor will not STOP the motor.
In the case of a faceplate stop trip, the start signal to terminal 12 should be removed if restarting is not desired.
When the reset key is pressed on the MM3, the motor will be restarted based on terminal 12.
GE Power Management
10.2 HAND/OFF/AUTO CONFIGURATION
MM3 Motor Manager 3
10.2.3 3-WIRE HAND / 2-WIRE AUTO
10.2.4 CONTROL OPERATION
RESET
is pressed.
10
10-5
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