GE MM3 Instruction Manual page 46

4.3 S2 PROTECTION
UNDERCURRENT TRIP
MESSAGE
DELAY: 10 s
STALLED ROTOR TRIP
MESSAGE
LEVEL: 4.50 xFLC
STALLED ROTOR TRIP
MESSAGE
DELAY: 3.0 s
4
4-16
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.
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 MM3 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.
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 MM3
will trip after the time specified by this setpoint.
MM3 Motor Manager 3
4 SETPOINTS
GE Power Management