Toshiba G7 manual Fault Screen Display Possible Causes

Fault Screen Display			Possible Causes
Motor Overload		•	V/f setting needs to be adjusted.
		•	Motor is locked.
		• Continuous operation at low speed.
		• Load requirement exceeds ability of the motor.
		• Startup frequency setting adjustment required.
No Fault		•	No active faults.
Option Fault		•	Optional device malfunction.
		• Improper system settings (at ASD or optional device).
		• Loose or improper connection.
Output Current Protection Fault		•	Output current is not within specified limits.
		• Loose or improper ASD-to-motor connection.
Output Phase Loss		•	3-phase output from the ASD is low or missing.
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.
Overcurrent During Acceleration		•	V/f setting needs to be adjusted.
		• Restart from a momentary power outage.
		• The ASD is starting into a rotating motor.
		• ASD/Motor not properly matched.
		•	Phase-to-phase short (U, V, or W).
		• Accel time too short.
		• Voltage Boost setting is too high.
		•	Motor/machine jammed.
		• Mechanical brake engaged while the ASD is running.
		• ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or less
			during acceleration. On ASDs that are greater than 100 HP, this fault occurs when
			the ASD current exceeds 320% of the rated FLA during acceleration.
Overcurrent During Deceleration		•	Phase-to-phase short (U, V, or W).
		• Deceleration time is too short.
		•	Motor/machine jammed.
		• Mechanical brake engaged while the ASD is running.
		• ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or less
			during deceleration. On ASDs that are greater than 100 HP, it occurs when the
			ASD current exceeds 320% of the rated FLA during deceleration.
Overcurrent During Run		•	Load fluctuations.
		• ASD is operating at an elevated temperature.
		• ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or less
			during a fixed-speed run or if during a fixed-speed run the ASD overheats. On
			ASDs that are greater than 100 HP, it occurs when the ASD current exceeds 320%
			of the rated FLA on a fixed-speed run.

178 G7 ASD Operation Manual