Toshiba NC3 Drives

Toshiba NC3 Drives Fault Codes:

Fault Code and MeaningCause and Remedy
E (0011)
Emergency stop
Cause:

During automatic operation or remote operation, an emergency stop command is entered from the operation panel or an external (terminal or communication).



Remedy:

  • Reset the inverter.

  • If the emergency stop signal is input, reset after releasing this signal.
E-13 (0045)
Over speed fault
Cause:

The input voltage fluctuates abnormally.
Over speed fault due to the overvoltage limit operation.



Remedy:

  • Check the input voltage.

  • Install an optional braking module.
E-18 (0032)
Break in analog signal cable
Cause:

The input signal from VI is equal to or less than the F633 setting.



Remedy:

  • Check the VI signal cable for breaks.

  • Check the input signal value or setting of F633.
E-19 (0033)
CPU communications error
Cause:

A communications error occurs between control CPUs.



Remedy:

  • Contact your Toshiba distributor.
E-20 (0034)
Excessive torque boosted
Cause:

The automatic torque boost parameter F402 setting is too high.
The motor has too small impedance.



Remedy:

  • Set a lower automatic torque boost parameter F402 setting.

  • Make an auto-tuning.
E-21 (0035)
CPU fault 2
Cause:

The control CPU is defective.



Remedy:

  • Contact your Toshiba distributor.
E-26 (003A)
CPU fault 3
Cause:

Internal CPU error.



Remedy:

  • Contact your Toshiba distributor.
EEP1 (0012)
EEPROM fault 1
Cause:

The EEPROM is writing error.



Remedy:

  • Turn off the inverter, then turn it on again.

  • If it does not recover from the error, contact your Toshiba distributor.
EEP2 (0013)
EEPROM fault 2
Cause:

TYP operation was aborted by power supply off etc.
The EEPROM is reading error.



Remedy:

  • Turn off the inverter, then turn it again, and then try TYP operation again.

  • If it does not recover from the error, contact your Toshiba distributor.
EEP3 (0014)
EEPROM fault 3
Cause:

The EEPROM is defective.



Remedy:

  • Contact your Toshiba distributor.
EF2 (0022)
Ground fault trip
Cause:

A ground fault occurs in the output cable or the motor.



Remedy:

  • Check the cable and the motor for ground faults.
EPH1 (0008)
Input phase failure
Cause:

A phase failure occurred in the input line of the main circuit.
The capacitor in the main circuit lacks capacitance.



Remedy:

  • Check the main circuit input line for phase failure.

  • Set input phase failure detection selection F608=0.

  • Check the capacitor in the main circuit for exhaustion.
EPH0 (0009)
Output phase failure
Cause:

A phase failure occurred in the output line of the main circuit.
The motor has too big impedance.



Remedy:

  • Check the main circuit output line, motor, etc. for phase failure.

  • Set output phase failure detection selection F605=0.
ERR2 (0015)
Main unit RAM fault
Cause:

The control RAM is defective.



Remedy:

  • Contact your Toshiba distributor.
ERR3 (0016)
Main unit ROM fault
Cause:

The control ROM is defective.



Remedy:

  • Contact your Toshiba distributor.
ERR4 (0017)
CPU fault 1
Cause:

The control CPU is defective.



Remedy:

  • Contact your Toshiba distributor.
ERR5 (0018)
Remote control error
Cause:

The communication with external devices was broken off.



Remedy:

  • Check the remote control device, cables, etc.
ETN (0028/0054/0055/0056)
Auto-tuning error
Cause:

The motor parameters (uL, uLu, F405, F415, F417) are not set correctly.
The motor capacity is 2 classes or less than the inverter.
Output cable is too thin.
Motor is not connected.
Motor is rotating.



Remedy:

  • Set the parameters correctly as per motor nameplate and retry auto-tuning.

  • Set parameter F416 to smaller 70% of present value and retry.

  • If output cable is thin or special load, set F400=1 when trip occurs.

  • Connect the motor.

  • Check secondary magnetic contactor.

  • Wait for motor to stop rotating before auto-tuning.
ETYP (0029)
Inverter type error
Cause:

It may be a breakdown failure.



Remedy:

  • Contact your Toshiba distributor.
OC1 (0001)
Overcurrent during acceleration
Cause:

The acceleration time ACC is too short.
The V/F setting is improper.
A restart signal is input to the rotating motor after a momentary stop.
Special motor (small impedance) is used.
Cable length to motor is long.



Remedy:

  • Increase the acceleration time ACC.

  • Check the V/F parameter.

  • Use F301 (auto-restart) and F302 (ride-through control).

  • In case of Pt=0, 1, decrease vb.

  • In case of Pt=2, 3, 4, set F415 (Motor rated current) and make an auto-tuning.

  • Install AC reactors on the output side.
OC2 (0002)
Overcurrent during deceleration
Cause:

The deceleration time dEC is too short.
The cable length to a motor is long.



Remedy:

  • Increase the deceleration time dEC.

  • Install AC reactors on the output side.
OC3 (0003)
Overcurrent during constant speed operation
Cause:

The load fluctuates abruptly.
The load is in an abnormal condition.
The cable length to a motor is long.



Remedy:

  • Reduce the load fluctuation.

  • Check the load (operated machine).

  • Install AC reactors on the output side.
OCA (0005)
Arm overcurrent at start-up
Cause:

A main circuit element is defective.



Remedy:

  • Contact your Toshiba distributor.
OCL (0004)
Overcurrent (load side at start-up)
Cause:

The insulation of the output main circuit or motor is defective.
The motor has too small impedance.



Remedy:

  • Check the secondary wiring and insulation state.

  • Set F613=2, 3.
OH (0010)
Overheat
Cause:

The cooling fan is life or fault.
The ambient temperature is high or low outside a specified ambient temperature.



Remedy:

  • The cooling fan requires replacement if it does not rotate. Contact distributor.

  • Operate at a specified ambient temperature.
OL1 (000D)
Inverter overload
Cause:

Acceleration time ACC too short.
DC braking amount too large.
V/F setting improper.
Restart signal input to rotating motor.
Load is too large.



Remedy:

  • Increase acceleration time ACC.

  • Reduce DC braking amount F251 and time F252.

  • Check V/F parameter setting.

  • Use F301 (auto-restart) and F302 (ride-through).

  • Use an inverter with a larger rating.

  • Reduce F300 (PWM carrier frequency) to 4kHz or less.
OL2 (000E)
Motor overload
Cause:

V/F setting improper.
Motor is locked up.
Low-speed operation performed continuously.
Excessive load applied.



Remedy:

  • Check V/F parameter setting.

  • Check the load (operated machine).

  • Adjust OLM to the overload the motor can withstand in low speed range.
OL3 (003E)
Main module overload
Cause:

Carrier frequency is high and load current increased at low speeds (mainly 15Hz or less).



Remedy:

  • Raise the operation frequency.

  • Reduce the load.

  • Reduce F300 (PWM carrier frequency).

  • Set F316=1 (Carrier frequency with automatic reduction).
OP1 (000A)
Overvoltage during acceleration
Cause:

Input voltage fluctuates abnormally (Power supply >200kVA, Capacitor open/close, Thyristor connected).
Restart signal input to rotating motor.



Remedy:

  • Insert a suitable input reactor.

  • Use F301 (auto-restart) and F302 (ride-through control).
OP2 (000B)
Overvoltage during deceleration
Cause:

Deceleration time dEC is too short (Regenerative energy too large).
Overvoltage limit operation F305 is disabled.
Input voltage fluctuates abnormally.



Remedy:

  • Increase deceleration time dEC.

  • Set overvoltage limit operation F305 to 0, 2, 3.

  • Insert a suitable input reactor.
OP3 (000C)
Overvoltage during constant-speed
Cause:

Input voltage fluctuates abnormally.
Motor is in regenerative state (load pushes motor faster than frequency).



Remedy:

  • Insert a suitable input reactor.

  • Install an optional brake module.
OT (0020)
Over-torque trip
Cause:

Over-torque reaches detection level during operation.



Remedy:

  • Enable F615 (over-torque trip selection).

  • Check system error.
UC (001D)
Low-current operation Trip
Cause:

Output current decreased to low-current detection level during operation.



Remedy:

  • Enable F610 (low-current detection).

  • Check suitable detection level (F609, F611, F612).

  • Contact distributor if setting is correct.
UP1 (001E)
Under voltage trip (main circuit)
Cause:

The input voltage (in the main circuit) is too low.



Remedy:

  • Check the input voltage.

  • Enable F627 (undervoltage trip selection).

  • Set F627=0 or 2, F302 and F301 for momentary power failure measures.
A-05
Output frequency upper limit
Cause:

Attempt made to operate at frequency higher than 10 times the base frequency.



Remedy:

  • Operate at a frequency within 10 times the base frequency.
A-17
Operation panel key alarm
Cause:

RUN or STOP key held down for >20 seconds.
Key is faulty.



Remedy:

  • Check the operation panel.
ATN
Auto-tuning
Cause:

Auto-tuning in process.



Remedy:

  • Normal if message disappears after a few seconds.
CLR
Clear command acceptable
Cause:

Displayed when pressing STOP key while an error code is displayed.



Remedy:

  • Press the STOP key again to clear the trip.
DB
DC braking
Cause:

DC braking in process.



Remedy:

  • Message goes off in several tens of seconds if no problem.
E1 / E2 / E3
Flowing out of excess number of digits
Cause:

Number of digits (e.g. frequencies) is more than 4.



Remedy:

  • Lower the frequency free unit magnification F702.
E-49
External power supply logic switching check
Cause:

Input terminal switched to sink logic of external power (+24V).



Remedy:

  • Remove connection of control terminals, reset or power cycle to switch logic.
E-50
Source logic switching check
Cause:

Input terminal switched to source logic.



Remedy:

  • Informational alarm.
E-51
Sink logic switching check
Cause:

Input terminal switched to sink logic.



Remedy:

  • Informational alarm.
EASY / STD
Switching display of Easy/Standard mode
Cause:

EASY key was pushed.



Remedy:

  • Indicates mode change.
EOFF
Emergency stop command acceptable
Cause:

Operation panel used to stop operation in auto/remote control mode.



Remedy:

  • Press STOP for emergency stop. Press any other key to cancel.
ERR1
Frequency point setting error
Cause:

Frequency setting signals at points 1 and 2 are too close.



Remedy:

  • Set points 1 and 2 apart from each other.
HEAD / END
Display of first/last data items
Cause:

First or last data item in group reached.



Remedy:

  • Press MODE key to exit data group.
HI / LO
Setting error alarm
Cause:

Error found in a setting when data is reading or writing.



Remedy:

  • Check whether the setting is made correctly.
INIT
Parameters in initialization
Cause:

Parameters are being initialized to default.



Remedy:

  • Normal if message disappears after a while.
LSTP
Auto-stop (continuous low limit)
Cause:

Automatic stop function (F256) activated.



Remedy:

  • Function cancelled when freq reference reaches LL+0.2Hz or command OFF.
MOFF
Undervoltage in main circuit
Cause:

Supply voltage between R, S, T is under voltage.
Shorting-bar between P0 and PA/+ removed (120V class).



Remedy:

  • Measure main circuit supply voltage.

  • Connect shorting-bar between P0 and PA/+.
NERR
No trip of past trip
Cause:

No new record of past trip.



Remedy:

  • Normal operation.
OFF
ST terminal OFF
Cause:

ST-CC circuit is opened.



Remedy:

  • Close the ST-CC circuit.
PASS / FAIL
Password verification
Cause:

Result of password input for F739.



Remedy:

  • PASS = correct, FAIL = incorrect.
RTRY
Retry in process
Cause:

Inverter in process of retry after momentary stop.



Remedy:

  • Inverter restarts automatically. Be careful.
SET
Input requirement of region setting
Cause:

Power supplied to inverter for the first time.



Remedy:

  • Set region setting using setting dial (set SET to 0, TYP to 13).
STOP
Deceleration stop during power failure
Cause:

Decel stop during power failure (F302) activated.



Remedy:

  • To restart, reset power or input operation signal again.
C
Overcurrent pre-alarm
Cause:

Current flows at or higher than stall prevention level.



Remedy:

  • Same as OC (overcurrent).
H
Overheat pre-alarm
Cause:

Overheat protection pre-alarm level reached.



Remedy:

  • Same as OH (overheat).
L
Overload pre-alarm
Cause:

Cumulative overload reaches 50% or more of trip value.



Remedy:

  • Same as OL (overload).
P
Overvoltage pre-alarm
Cause:

Voltage generated at or higher than stall prevention level.



Remedy:

  • Same as OP (overvoltage).
T
Communication pre-alarm
Cause:

Communication broken off at or higher than F803 setting.



Remedy:

  • Same as ERR5 (communication fault).