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4-18 MM2 Motor Manager 2

GE Power Management

4.3 S2 PROTECTION 4 SETPOINTS

UNDERCURRENT ALARM

LEVEL: OFF %FLC

Range: 10 to 100% FLC or OFF; Step: 1% FLC

This feature functions the same as the Undercurrent Trip feature but

produces an alarm indication instead of a trip.

UNDERCURRENT ALARM

DELAY: 10 s

Range: 1 to 60 seconds; Step: 1 second

Enter the delay for activation of the Undercurrent Alarm.

UNDERCURRENT TRIP:

LEVEL: OFF %FLC

Range: 10 to 100% FLC or OFF; Step: 1% FLC

For applications such as pumps an Undercurrent Trip can be selected.

If the current remains below this value while the motor is running for the

time specified in the UNDERCURRENT TRIP DELAY, the MM2 will trip. Set

this value to OFF if no Undercurrent Trip is required.

UNDERCURRENT TRIP

DELAY: 10 s

Range: 1 to 60 seconds; Step: 1 second

Set the UNDERCURRENT TRIP DELAY long enough to prevent nuisance

trips from momentary current dips when the Undercurrent Trip feature is

used.

STALLED ROTOR TRIP

LEVEL: 4.50 xFLC

Range: 1.15 to 4.50 x FLC or OFF; Step: 0.05 x FLC

Mechanical equipment such as pumps or fans can be quickly damaged

if it jams, resulting in a locked rotor stall. Even though the motor may be

able to withstand the locked rotor for a longer time, it may be desirable

to trip the motor quickly as soon as the stall condition occurs. The MM2

will trip when the running current exceeds this value after the Stalled

Rotor Time. Set this value to OFF if stall protection of driven equipment

is not required since the thermal overload protection will protect the

motor. This feature is defeated during the inrush of motor starting.

STALLED ROTOR TRIP

DELAY: 3.0 s

Range: 0.5 to 5.0 seconds; Step: 0.5 seconds

If the STALLED ROTOR TRIP LEVEL is set to a value other than OFF, the

MM2 will trip after the time specified by this setpoint.

GE MOTOR MANAGER 2 User Manual

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