Toshiba VF-AS1 instruction manual Input voltage fluctuates abnormally

	!				E6581301!
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		Error	Description	Possible causes	Remedies
		code
				•Rapid acceleration is operated.	•Increase the acceleration time ￿￿￿.
				•The DC braking amount is too	•Reduce the DC braking amount ￿￿￿￿ and the
				large.	DC braking time ￿￿￿￿.
		￿￿￿￿	Inverter	•The V/f setting is improper.	•Check the V/f parameter setting.
			overload	•A restart signal is input to the	•Use ￿￿￿ (Auto-restart) and ￿￿￿ (Regenerative
				rotating motor after a momentary	power ride-though control).
				stop, etc.
				•The load is too large.	•Use an inverter with a larger rating.
				•The V/f parameter is improperly	•Check the V/f parameter setting.
				set.	•Check the load (operated machine).
				•The motor is locked up.	•Check the ￿￿￿ setting and adjust ￿￿￿￿
		￿￿￿￿	Motor overload	•Low-speed operation is performed	according to the sustainable overload in the motor
				continuously.	low-speed range.
				•An excessive load is applied to the	•Reduce the DC braking amount ￿￿￿￿ and the
				motor during operation.	DC braking time ￿￿￿￿.
			Dynamic	•Rapid deceleration is operated.	•Increase the deceleration time ￿￿￿.
				•Dynamic braking is too large.	•Increase the capacity of dynamic braking resistor
		￿￿￿￿	braking resistor
			overload		(wattage) and adjust PBR capacity parameter
					￿￿￿￿.
				•The input voltage fluctuates abnormally.	•Insert a suitable input reactor.
				(1)The power supply has a capacity
				of 500kVA or more.
				(2)A power factor improvement
			Overvoltage	capacitor is opened and closed.
		￿￿￿￿	during	(3)A system using a thyrister is
			acceleration	connected to the same power
				distribution line.
				•A restart signal is input to the	•Use ￿￿￿ (Auto-restart) and ￿￿￿ (Regenerative
				rotating motor after a momentary	power ride-though control).
				stop, etc.
				•The deceleration time ￿￿￿ is too	•Increase the deceleration time ￿￿￿.
				short (regenerative energy is too
				large).
				•The dynamic braking resistor has	•Install a dynamic braking resistor.
				a considerably large resistance.	•Decrease dynamic braking resistance. (Also reset
				•￿￿ (Dynamic braking resistor) is OFF.	the ￿￿￿.)
			Overvoltage	Overvoltage limit operation ￿￿￿￿	•Set dynamic braking mode parameter ￿￿
				is OFF.	properly.
		￿￿￿￿	during
				•The input voltage fluctuates abnormally.	•Set overvoltage limit operation ￿￿￿￿ properly.
			deceleration
				(1)The power supply has a capacity	•Insert a suitable input reactor.
				of 500kVA or more.
				(2)A power factor improvement
				capacitor is opened and closed.
				(3)A system using a thyrister is
				connected to the same power
				distribution line.
				•The input voltage fluctuates abnormally.	•Insert a suitable input reactor.
				(1)The power supply has a capacity
				of 500kVA or more.
				(2)A power factor improvement
				capacitor is opened and closed.
			Overvoltage	(3)Asystem using a thyrister is connected
		￿￿￿￿	during fixed	to the same power distribution line.
			speed operation	•The motor is in a regenerative	•Install a dynamic braking resistor.
				state because the load causes the
				motor to run at a frequency higher
				than the inverter output frequency.
				•The undervoltage detection level	•Check the undervoltage detection level ￿￿￿￿.
				￿￿￿￿ is too low.
				•Overtorque reaches to a detection	•Check system error.
				level during operation.
13		*￿￿	Overtorque	•Stall prevention operation was	•Check whether the motor is overloaded or the
				performed continuously for a	brake is engaged.
				length of time longer than that set
				with ￿￿￿￿.
				•The output current decreased to a	•Check the suitable detection level for the system
		*￿￿	Low current	low-current detection level during	(￿￿￿￿).
				operation.	•Contact your Toshiba distributor if the setting is correct.
				•The input voltage (in the main	•Check the input voltage.
				circuit) is too low.	•To cope with a momentary stop due to
		*￿￿￿	Voltage drop in	•Momentary power failure occurs	undervoltage, enable ￿￿￿ (Regenerative power
			main circuit	because undervoltage continues	ride-through control), ￿￿￿ (auto-restart control),
				longer than undervoltage detection	and ￿￿￿￿ (Undervoltage detection time).
				time ￿￿￿￿.

*Presence or absence of parameter trip can be selected. (Continued overleaf)

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