B-2 MM2 Motor Manager 2
GE Power Management
B.1 MM2 FAQ APPENDIX B
B
After connecting the MM2 through an interface device to a PLC network, communica-
tions to the MM2 cannot be established. What is the problem?
Verify the following:
1. if master communicating with Modbus® RTU protocol
2. wiring between interface device and MM2
3. MM2 communications address
4. master polling address
5. MM2 baud rate
6. master baud rate
7. MM2 parity setpoint
8. master parity settings
If the problem persists, call GE Power Management for technical support.
Can the MM2 interface with an external analog device?
Yes. The MM2 has a single analog input that can be used to monitor an external transducer.
Alarm and trip setpoints can be configured to warn the user or shut down the motor.
Can the MM2 be used on medium voltage motors?
No. The MM2 was designed specifically for the low voltage market (600 V or less). The pro-
tection features offered in the MM2 are typically not advanced enough for larger, more
expensive motors. The power measuring will only accommodate 600 V systems.
Can the control transformer in the MCC be used for the VT input on the MM2 as well
as for control voltage?
Yes, provided that control transformer secondary voltage is 110 V or 120 V, which corre-
sponds to the VT SECONDARY VOLTAGE setpoint.
Can the START keys on the faceplate of the MM2 be disabled?
Yes. One of the programmable switch inputs can be configured to REMOTE PERMISSIVE
and a jumper placed from Switch Common to permanently energize that switch input. This
will allow starts from the switch inputs of the MM2 only, when in the MANUAL mode.
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