GE MM3, Instruction Manual, Page: 202 / 230

9–4 MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
CONTROL WIRE APPLICATIONS CHAPTER 9: APPLICATIONS
9.1.3 HOA Three-
wire Hand /
Two-wire Auto
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 Motor Manager 3 for three-wire hand / two-wire auto control, set:
S3 PROCESS Ö PROGRAMMABLE INPUTS Ö INTERLOCK INPUT 1 : “TWO WIRE CONTROL”
S3 PROCESS
ÖØ
STOP CONFIGURATION
ÖØ
FACEPLATE STOP : “LATCHED”
The
INTERLOCK INPUT 1
setpoint was chosen to match the wiring diagram provided. Any of
the available Interlocks 1 through 10 could be programmed for two-wire control.
HAND operation:
• 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
RESET is pressed.
OFF operation:
• In the off position, the motor will stop.
AUTO operation:
• 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 Motor Manager 3 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 output relay, an
OPEN CONTROL CIRCUIT alarm will occur. This will
cause Contactor A output relay to open.
In the auto position the STOP button at the motor will not STOP the motor.
NOTE