Toshiba VF-S9 manual Problem Possible causes Remedies Overvoltage during

E6580757

(Continued)

Error code

Communication

No.

Problem

Possible causes

Remedies

		C	Overvoltage during	• The input voltage fluctuates abnormally.			•	Insert a suitable input reactor.
			constant-speed op-	(1) The power supply has a capacity of
			eration		200kVA or more.
				(2) A power factor improvement capacitor is
					opened or closed.
				(3) A system using a thyristor is connected
					to the same power distribution line.
				• The motor is in a regenerative state be-			•	Install a dynamic braking resistor.
					cause the load causes the motor to run at
					a frequency higher than the inverter out-
					put frequency.
		D	Inverter overload	•	The acceleration time	is too short.	•	Increase the acceleration time			.
				• The DC braking amount is too large.			•	Reduce the DC braking amount
				•	The V/F setting is improper.			and the DC braking time			.
				• A restart signal is input to the rotating			•	Check the V/F parameter setting.
					motor after a momentary stop, etc.		•	Use	(auto-restart) and
				• The load is too large.				(ride-through control).
							• Use an inverter with a larger rating.
		E	Motor overload	•	The V/F setting is improper.		•	Check the V/F parameter setting.
				• The motor is locked up.			•	Check the load (operated machine).
				• Low-speed operation is performed con-			•	Adjust	to the overload that the
					tinuously.			motor can withstand during operation in a
				• An excessive load is applied to the motor				low speed range.
					during operation.
	*	9	Output phase failure	• A phase failure occurred in the output line			•	Check the main circuit output line, motor,
					of the main circuit.			etc., for phase failure.
							•	Enable	(Output phase failure de-
								tection).
	*	8	Input phase failure	• A phase failure occurred in the input line			•	Check the main circuit input line for phase
					of the main circuit.			failure.
							•	Enable	(input phase failure detec-
								tion).
		2Eh	External thermal trip	• A thermal trip command is entered from			•	Check the external input device.
					an external input device.
	*	20h	Over-torque trip	• The load torque rises up to the over-			•	Enable	(Over - torque trip selection)
					torque detection level during operation		•	Check whether the system is in a normal
								condition.
		F	Dynamic braking re-	• The deceleration time is too short.			•	Increase the deceleration time			.
			sistor overload trip	• The dynamic braking amount is too large.			•	Use a dynamic resistor with a larger ca-
								pacity (W) and adjust		(PBR ca-
								pacity parameter) accordingly.
		10h	Overheat	• The cooling fan does not rotate.			•	Restart the operation by resetting the
				• The ambient temperature is too high.				inverter after it has cooled down enough.
				• The vent is blocked up.			•	The fan requires replacement if it does
				• A heat generating device is installed close				not rotate during operation.
					to the inverter.		•	Secure sufficient space around the
				• The thermistor in the unit is broken.				inverter.
							• Do not place any heat-generating device
								near the inverter.
							• Make a service call.
13
	*	1E	Undervoltage trip	• The input voltage (in the main circuit) is			•	Check the input voltage.
			(main circuit)		too low.		•	Enable	(undervoltage trip selec-
								tion).
							• To cope with a momentary stop due to
								undervoltage, enable		(ride-through
								control) and	(auto-restart).

*With a parameter, you can choose between trip-on and -off. (Continued overleaf)

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