Toshiba G7 manual 179

Fault Screen Display		Possible Causes
Overheat	•	Cooling fan inoperative.
	• Ventilation openings are obstructed.
	• Internal thermistor is disconnected.
Over Speed	•	Result of a motor speed that is greater than the commanded speed when using an
		encoder for speed control.
	• Improper encoder connection or setup information.
	•	Defective encoder.
Overtorque	•	A torque requirement by the load in excess of the setting of F616 or F617 for a
		time longer than the setting of F618.
	• The ASD is improperly matched to the application.
	• The load is obstructed.
Overvoltage During Acceleration	•	Motor running during restart.

Note:	The event that caused the Trip(s) must be corrected or must decrease to less than the threshold
	value required to cause the trip to allow for a Reset to be recognized. In the event of multiple
	active trips, the trip displayed will remain until all faults are corrected and all trips are cleared.
Overvoltage During Deceleration		•	Deceleration time is too short.
		• DBR value is too high.
		• DBR required (DBR setup required).
		• Stall protection is disabled.
		• 3-phase input voltage is out of specification.
		•	Input reactance required.
Overvoltage During Run		•	Load fluctuations.
		• 3-Phase input voltage out of specification.
PG Type/Connection Error		•	ASD is configured to receive a signal from a shaft-mounted encoder and no signal
			is being received while running.
		• Disconnection at the Encoder circuit.
		• Motor is stopped and is generating torque via torque limit control.
		• ASD is not configured properly.
Phantom Fault		•	In a multiple ASD configuration a faulted ASD signals the remaining ASDs that a
			fault has occurred and shuts down the non-faulted ASDs.
Position Deviation Error		•	Operating in the Position Control mode and the resulting position exceeds the
			limits of the F631 setting.
RAM Fault		•	Internal RAM malfunction.
ROM Fault		•	Internal ROM malfunction.
Sink/Source Setting Error		•	Improperly positioned Sink/Source jumper on the control board or on an option
			device.
		• Sink/Source configuration of an option device is incorrect.
Torque Proving Fault		•	Lift-First Pulse Count (F743) adjustment required.

G7 ASD Operation Manual 179