ACE-tronics G9 ASD Installation and Operation Manual 251
MS Relay Off/Soft Start
Alarm
MOFF Under-voltage condition at
the 3-phase AC input to the
ASD.
• Low 3-phase utility voltage.
Over-Current OC ASD output current greater
than
F601 setting.
• Defective IGBT (U, V, or W).
• ASD output to the motor is connected
incorrectly.
• ASD output phase-to-phase short.
• The ASD is starting into a spinning motor.
• Motor/machine jammed.
• Mechanical brake engaged while the ASD is
starting or while running.
• Accel/Decel time is too short.
• Voltage Boost setting is too high.
• Load fluctuations.
• ASD operating at an elevated temperature.
*Over-Heat OH ASD ambient temperature
excessive.
• ASD is operating at an elevated temperature.
• ASD is too close to heat-generating
equipment.
• Cooling fan vent is obstructed (see Mounting
the ASD on pg. 15).
• Cooling fan is inoperative.
• Internal thermistor is disconnected.
Over-Torque OT Torque requirement in excess
of the setting of
F616 or F617
for a time longer than the
setting of
F618.
• ASD is not correctly matched to the
application.
• F616 or F617 setting is too low.
• Obstructed load.
* Reset ignored if active.
LCD Screen
LED
Screen
Description Possible Causes
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