Toshiba G9 Installation And Operation Manual page 261

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LED
LCD Screen
Screen
MOFF
MS Relay Off/Soft Start
Alarm
OC
Over-Current
*Over-Heat OH
OT
Over-Torque
* Reset ignored if active.
ACE-tronics G9 ASD Installation and Operation Manual
Description
Under-voltage condition at
the 3-phase AC input to the
ASD.
ASD output current greater
than F601 setting.
ASD ambient temperature
excessive.
Torque requirement in excess
of the setting of F616 or F617
for a time longer than the
setting of F618.
Possible Causes
• Low 3-phase utility voltage.
• 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.
• ASD is operating at an elevated temperature.
• ASD is too close to heat-generating
equipment.
• Cooling fan vent is obstructed (see
the ASD on pg. 15).
• Cooling fan is inoperative.
• Internal thermistor is disconnected.
• ASD is not correctly matched to the
application.
• F616 or F617 setting is too low.
• Obstructed load.
Mounting
251