Restoring the inverter (VFD) from a trip
Do not reset the inverter when tripped because of a failure or error before eliminating the cause. Resetting the tripped inverter before eliminating the problem causes it to trip again.
The inverter can be restored from a trip by any of the following operations:
(1) By turning off the power (Keep the inverter off until the LED turns off.)
(2) By means of an external signal (Short circuit between RES and CC on terminal board → Open)
(3) By operation panel operation
(4) By inputting a trip clear signal from a remote input device
(Refer to the remote input device operating manual for details.)

To reset the inverter by operation panel operation, follow these steps.
1. Press the STOP key and make sure that Clr is displayed.
2. Pressing the STOP key again will reset the inverter if the cause of the trip has already been eliminated.


The motor runs in the wrong direction.
• Invert the phases of the output terminals U, V and W.
• Invert the forward/reverse run-signal terminals of the external input device.
• Change the setting of the parameter Fr in the case of panel operation.

The motor runs but its speed does not change normally.
• The load is too heavy. Reduce the load.
• The soft stall function is activated. Disable the soft stall function.
• The maximum frequency FH and the upper limit frequency UL are set too low.
Increase the maximum frequency FH and the upper limit frequency UL.
• The frequency setting signal is too low. Check the signal set value, circuit, cables, etc.
• Check the setting characteristics (point 1 and point 2 settings) of the frequency setting signal parameters.  
• If the motor runs at a low speed, check to see that the stall prevention function is activated because the torque boost amount is too large.
Adjust the torque boost amount (ub) and the acceleration time (ACC).

The motor does not accelerate or decelerate smoothly.
• The acceleration time (ACC) or the deceleration time (dEC) is set too short.
Increase the acceleration time (ACC) or the deceleration time (dEC).
A too large current flows into the motor.
• The load is too heavy. Reduce the load.
• If the motor runs at a low speed, check whether the torque boost amount is too large.
The motor runs at a higher or lower speed than the specified one.
• The motor has an improper voltage rating. Use a motor with a proper voltage rating.
• The motor terminal voltage is too low.
Check the setting of the base frequency voltage parameter (uLu) .
Replace the cable with a cable larger in diameter.
• The reduction gear ratio, etc., are not set properly. Adjust the reduction gear ratio, etc.
• The output frequency is not set correctly. Check the output frequency range.
• Adjust the base frequency.  

The motor speed fluctu-ates during operation.
• The load is too heavy or too light. Reduce the load fluctuation.
• The inverter or motor used does not have a rating large enough to drive the load.
Use an inverter or motor with a rating large enough.
• Check whether the frequency setting signal changes.
• If the V/F control selection parameter Pt is set at 3, check the vector control setting, operation conditions, etc.

Parameter settings cannot be changed.
Change the setting of the parameter F700 (prohibition of change of parameter setting) to 0 (permitted) if it is set at 1 (prohibited).
* For reasons of safety, some parameters cannot be reprogrammed while the inverter is running.

[Prealarm display]
C Overcurrent alarm Same as OC (overcurrent)
P Overvoltage alarm Same as OP (overvoltage)
L Overload alarm Same as OL1 and OL2 (overload)
H Overheat alarm Same as OH (overheat)

OC1 0001 (OC1P 0025)
Overcurrent during acceleration
Overcurrent flowing in element during acceleration
• The acceleration time ACC is too short.
• The V/F setting is improper.
• A restart signal is imput to the rotating motor after a momentary stop, etc.
• A special motor (e.g. motor with a small impedance) is used.
• Increase the acceleration time ACC.
• Check the V/F parameter.
• Use F301 (auto-restart) and F302 (ride-through control).
• Adjust the carrier frequency F300.
• Set the carrier frequency control mode selection parameter f316 to 1 or 3 (carrier frequency decreased automatically).
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OC2 0002 (OC2P 0026 )
Overcurrent during deceleration
Overcurrent flowing in element during decelearion
• The deceleration time dEC is too short.
• Increase the deceleration time dEC.
• Set the carrier frequency (pwm) control mode selection parameter f316 to 1 or 3 (carrier frequency decreased automatically).
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OC3 003 (OC3P 0027)
Overcurrent during constant speed operation
Overcurrent flowing in element during operation
• The load fluctuates abruptly.
• The load is in an abnormal condition.
• Reduce the load fluctuation.
• Check the load (operated machine).
• Set the carrier frequency control mode selection parameter f316 to 1 or 3 (carrier frequency decreased automatically).
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OC1P, OC2P, OC3P
Ground fault trip
Arm overcurrent at start-up (for 11 and 15 kW models only)
• A current leaked from an output cable or the motor to ground.
• A main circuit elements is defective.
• Check cables, connectors, and so on for ground faults.
• Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)..
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OCL 0004 Overcurrent
(An overcurrent on the load side at start-up)
• The insulation of the output main circuit or motor is defective.
• The motor has too small impedance.
• A 11 or 15 kW model was started, although a current is leaked from an output cable or the motor to ground.
• Check the cables and wires for defective insulation.
• When using a 11 or 15 kW model, check cables, connectors, and so on for ground faults.
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OCA 0005 Arm overcurrent at start-up
• A main circuit elements is defective.
• Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)..
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EPHI 0008 Input phase failure
• A phase failure occured in the input line of the main circuit.
• The capacitor in the main circuit lacks capacitance.
• Check the main circuit input line for phase failure.
• Enable F608 (input phase failure detection).
• Check the capacitor in the main circuit for exhaustion.
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EPHO 0009 Output phase failure
• A phase failure occurred in the output line of the main circuit.
• Check the main circuit output line, motor,etc. for phase failure.
• Enable F605 (Output phase failure detection).
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OP1 000A Overvoltage during acceleration
• The imput voltage fluctuates abnormally.
(1) The power supply has a capacity of 200kVA or more.
(2) A power factor improvement capacitor is opened or closed.
(3) A system using a thyrister is connected to the same power distribution line.
• A restart signal is input to the rotating motor after a momentary stop, etc.
• Insert a suitable input reactor.
• Use F301 (auto-restart) and F302 (ride-through control).
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OP2 000B Overvoltage during deceleration
• The deceleration time dEC is too short. (Regenerative energy is too large.)
• F304 (dynamic braking resistor) is off.
• F305 (overvoltage limit operation) is off.
• The input voltage fluctuates abnormally.
(1) The power supply has a capacity of 200kVA 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.
• Increase the deceleration time dEC.
• Install a dynamic braking resistor.
• Enable F304 (dynamic braking resistor).
• Enable F305 (overvoltage limit operation).
• Insert a suitable input reactor.
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OP3 000C Overvoltage during constant-speed operation
• The input voltage fluctuates abnormally.
(1) The power supply has a capacity of 200kVA or more.
(2) A power factor improvement capacitor is opened or closed.
(3) A system using a thyrister is connected to the same power distribution line.
• The motor is in a regenerative state because the load causes the motor to run at a frequency higher than the inverter output frequency.
• Insert a suitable input reactor.
• Install a dynamic braking resistor.
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OL1 000D Inverter overload
• The acceleration time ACC is too short.
• The DC braking amout is too large.
• The V/F setting is improper.
• A restart signal is input to the rotating motor after a momentary stop, etc.
• The load is too large.
• Increase the acceleration time ACC.
• Reduce the DC braking amount F251 and the DC braking time F252.
• Check the V/F parameter setting.
• Use F301 (auto-restart) and F302 (ride-through control).
• Use an inverter with a larger rating.
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OL2 000E Motor overload
• The V/F setting is improper.
• The motor is locked up.
• Low-speed operation is performed continuously.
• An excessive load is applied to the motor during operation.
• Check the V/F parameter setting.
• Check the load (operated machine).
• Adjust OLN to the overload that the motor can withstand during operation in a low speed range.
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OLr 000F Dynamic braking resistor overload trip
• The deceleration time is too short.
• Dynamic braking is too large.
• Increase the deceleration time dEC.
• Increase the capacity of dynamic braking resistor (wattage) and adjust PBR capacity parameter F308.
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Ot 0020 Over-torque trip
• Over-torque reaches to a detection level during operation.
• Enable F615 (over-torque trip selection).
• Check system error.
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OH 0010 Overheat
• The cooling fan does not rotate.
• The ambient temperature is too high.
• The vent is blocked up.
• A heat generating device is installed close to the inverter.
• The thermistor in the unit is broken.
• Restart the operation by resetting the inverter after it has cooled down enough.
• The fan requires replacement if it does not rotate during operation.
• Secure sufficient space around the inverter.
• Do not place any heat generating device near the inverter.
• Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)..
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OH2 002E External thermal trip
• An external thermal trip is input.
• Check the external thermal input.
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E 0011 Emergency stop
• During automatic operation or remote operation, a stop command is entered from the operation panel or a remote input device.
• Reset the inverter.
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EEP1 0012 EEPROM fault 1
• A data writing error occurs.
• Turn off the inverter, then turn it again. If it does not recover from the error, • Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)...
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EEP2 0013 EEPROM fault
• Power supply is cut off during tyP operation and data writing is aborted.
• Turn the power off temporarily and turn it back on, and then try tyP operation again.
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EEP3 0014 EEPROM fault 3
• A data reading error occurred.
• Turn off the inverter, then turn it again. If it does not recover from the error, • Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)...
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Err2 0015 Main unit RAM fault • The control RAM is defective. • Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)...
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Err3 0016 Main unit ROM fault • The control ROM is defective. • Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)...
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Err4 0017 CPU fault 1 • The control CPU is defective. • Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)...
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Err5 0018 Remote control error • An error arises during remote operation. • Check the remote control device, cables, etc.
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Err7 001A Current detector fault • The current detector is defective. • Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)...
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Err8 001B Optional circuit board format error
• An optional circuit board in a different format is installed.
• Check again to be sure that the circuit board is connected correctly, and then reset the power supply.
• Replace the circuit board with a correctly formatted one.
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UC 001D Low-current operation Trip
• The output current decreased to a lowcurrent detection level during operation.
• Enable F610 (low-current detection).
• Check the suitable detection level for the system (F611, F612).
• Make a service call if the setting is correct.
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UP1 001E Undervoltage trip (main circuit)
• The input voltage (in the main circuit) is too low.
• Check the input voltage.
• Enable F627 (undervoltage trip selection).
• To cope with a momentary stop due to undervoltage, enable F302 (ridethrough control) and F301 (autorestart).
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EF2 0022 Ground fault trip
• A ground fault occurs in the output cable or the motor.
• Check the cable and the motor for ground faults.
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Etn1 0054 Auto-tuning error
• Check the motor parameter F401 to F494.
• The motor with the capacity of 2 classes or less than the inverter is used.
• The output cable is too thin.
• The motor is rotating.
• The inverter is used for loads other than those of three-phase induction motors.
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EtyP 0029 Inverter type error
• Circuit board is changed. (Or main circuit/drive circuit board)
• Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)..
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E-18 0032 Brea in analog signal cable
• The analog signal input via VIA is below the analog sinal detectio level set with F633.
• Check the cables for breaks. And check the setting of input signal or setting value of F633.
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E-19 0033 CPU communications error
• A serial communications error occurs between control CPUs.
• Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)..
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E-20 0034 Excessive torque boosted
• The torque boost parameter F402 is set too high.
• The motor has too small impedance.
• Decrease the setting of the torque boost parameter F402.
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E-21 0035 CPU fault 2
• The control CPU is defective.
• Contact our TOSHIBA product representative (contact information available on the Toshiba cantact)..
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SOUT 002F Step-out (For PM motor only)
• The motor shaft is locked.
• One output phase is open.
• An impact load is applied.
• Unlock the motor shaft.
• Check the interconnect cables between the inverter and the pm motor.
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OFF ST terminal OFF
• The ST-CC circuit is opened.
• Close the ST-CC circuit.

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nOFF Undervoltage in main circuit
• The supply voltage between R, S and T is under voltage.
• Measure the main circuit supply voltage. If the voltage is at a normal level, the inverter requires repairing.
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rtrY Retry in process
• The inverter is n the process of retry.
• A momentary stop occurred.
• The inverter is normal if it restarts after several tens of senconds.
The inverter restarts automatically. Be careful of the machine because it may suddenly restart.

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Err1  Frequency point setting error alarm
• The frequency setting signals at points 1 and 2 are set too close to each other.
• Set the frequency setting signals at points 1 and 2 apart from each other.
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CLr Clear command acceptable
• This message is displayed when pressing the STOP key while an error code is displayed.
• Press the STOP key again to clear the trip.
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EOFF Emergency stop command acceptable
• The operation panel is used to stop the operation in automatic control or remote control mode.
• Press the STOP key for an emergency stop.
To cancel the emergency stop, press any other key.