Toshiba S11 Drives

Toshiba S11 Drives Fault Codes:

Fault Code and MeaningCause and Remedy
OC1 / OC1P
(0001 / 0025)

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.

  • A special motor (e.g. motor with small impedance) is used.




Remedy:


  • 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.
OC2 / OC2P
(0002 / 0026)

Overcurrent during deceleration
Cause:


  • The deceleration time (dEC) is too short.




Remedy:


  • Increase the deceleration time (dEC).

  • Set the carrier frequency control mode selection parameter F316 to 1 or 3.
OC3 / OC3P
(0003 / 0027)

Overcurrent during constant speed operation
Cause:


  • The load fluctuates abruptly.

  • The load is in an abnormal condition.




Remedy:


  • Reduce the load fluctuation.

  • Check the load (operated machine).

  • Set the carrier frequency control mode selection parameter F316 to 1 or 3.
OC1P / OC2P / OC3P
(0025 / 0026 / 0027)

Ground fault trip / Arm overcurrent at start-up
Cause:


  • A current leaked from an output cable or the motor to ground.

  • A main circuit element is defective.




Remedy:


  • Check cables, connectors, and so on for ground faults.

  • Make a service call.
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.

  • A 11 or 15 kW model was started, although a current is leaked from an output cable or the motor to ground.




Remedy:


  • Check the cables and wires for defective insulation.

  • When using a 11 or 15 kW model, check cables and connectors for ground faults.
OCR
(0005)

Arm overcurrent at start-up
Cause:


  • A main circuit element is defective.




Remedy:


  • Make a service call.
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.

  • Enable F608 (input phase failure detection).

  • 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.




Remedy:


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

  • Enable F605 (Output phase failure detection).
OP1
(000A)

Overvoltage during acceleration
Cause:


  • The input voltage fluctuates abnormally.

  • A restart signal is input to the rotating motor after a momentary stop.




Remedy:


  • Insert a suitable input reactor.

  • Use F301 (auto-restart) and F302 (ride-through control).
OP2
(000B)

Overvoltage during deceleration
Cause:


  • The deceleration time (dEC) is too short.

  • F304 (dynamic braking resistor) is off.

  • F305 (overvoltage limit operation) is off.

  • The input voltage fluctuates abnormally.




Remedy:


  • Increase the deceleration time (dEC).

  • Install a dynamic braking resistor.

  • Enable F304 and F305.

  • Insert a suitable input reactor.
OP3
(000C)

Overvoltage during constant-speed operation
Cause:


  • The input voltage fluctuates abnormally.

  • The motor is in a regenerative state because the load causes the motor to run at a frequency higher than the inverter.




Remedy:


  • Insert a suitable input reactor.

  • Install a dynamic braking resistor.
OL1
(000D)

Inverter overload
Cause:


  • The acceleration time (ACC) is too short.

  • The DC braking amount is too large.

  • The V/F setting is improper.

  • The load is too large.




Remedy:


  • Increase the acceleration time.

  • Reduce DC braking amount (F251) and time (F252).

  • Check V/F parameter setting.

  • Use an inverter with a larger rating.
OL2
(000E)

Motor overload
Cause:


  • 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.




Remedy:


  • Check the V/F parameter setting.

  • Check the load (operated machine).

  • Adjust OLM to the overload the motor can withstand.
OLr
(000F)

Dynamic braking resistor overload trip
Cause:


  • The deceleration time is too short.

  • Dynamic braking is too large.




Remedy:


  • Increase the deceleration time (dEC).

  • Increase the capacity of dynamic braking resistor and adjust PBR capacity parameter F308.
Ot
(0020)

Over-torque trip
Cause:


  • Over-torque reaches a detection level during operation.




Remedy:


  • Enable F615 (over-torque trip selection).

  • Check system error.
OH
(0010)

Overheat
Cause:


  • 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.




Remedy:


  • Restart after cooling down.

  • Replace fan if not rotating.

  • Secure sufficient space around the inverter.

  • Make a service call.
OH2
(002E)

External thermal trip
Cause:


  • An external thermal trip is input.




Remedy:


  • Check the external thermal input.
E
(0011)

Emergency stop
Cause:


  • During automatic/remote operation, a stop command is entered from the operation panel.




Remedy:


  • Reset the inverter.
EEP1
(0012)

EEPROM fault 1
Cause:


  • A data writing error occurs.




Remedy:


  • Turn off the inverter, then turn it again. If error persists, make a service call.
EEP2
(0013)

EEPROM fault 2
Cause:


  • Power supply is cut off during tyP operation and data writing is aborted.




Remedy:


  • Turn power off temporarily and turn back on, then try tyP operation again.
EEP3
(0014)

EEPROM fault 3
Cause:


  • A data reading error occurred.




Remedy:


  • Turn off the inverter, then turn it again. If error persists, make a service call.
Err2
(0015)

Main unit RAM fault
Cause:

  • The control RAM is defective.



Remedy:

  • Make a service call.
Err3
(0016)

Main unit ROM fault
Cause:

  • The control ROM is defective.



Remedy:

  • Make a service call.
Err4
(0017)

CPU fault 1
Cause:

  • The control CPU is defective.



Remedy:

  • Make a service call.
Err5
(0018)

Remote control error
Cause:

  • An error arises during remote operation.



Remedy:

  • Check the remote control device, cables, etc.
Err7
(001A)

Current detector fault
Cause:

  • The current detector is defective.



Remedy:

  • Make a service call.
Err8
(001B)

Optional circuit board format error
Cause:

  • An optional circuit board in a different format is installed.



Remedy:


  • Check circuit board connection and reset power.

  • Replace the circuit board with a correctly formatted one.
UC
(001D)

Low-current operation Trip
Cause:

  • The output current decreased to a low-current detection level.



Remedy:


  • Enable F610 (low-current detection).

  • Check detection level setting (F611, F612).
UP1
(001E)

Undervoltage trip (main circuit)
Cause:

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



Remedy:


  • Check the input voltage.

  • Enable F627 (undervoltage trip selection).

  • Enable F302 and F301 for momentary stops.
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.
Etn1
(0054)

Auto-tuning error
Cause:


  • Check motor parameter F401 to F494.

  • Motor capacity is 2 classes or less than the inverter.

  • Output cable is too thin.

  • Motor is rotating.




Remedy:

  • Check connections and motor parameters.
EtyP
(0029)

Inverter type error
Cause:

  • Circuit board is changed.



Remedy:

  • Make a service call.
E-18
(0032)

Break in analog signal cable
Cause:

  • The signal input via VIA is below the analog signal detection level set with F633.



Remedy:

  • Check cables for breaks. Check F633 setting.
E-19
(0033)

CPU communications error
Cause:

  • A communications error occurs between control CPUs.



Remedy:

  • Make a service call.
E-20
(0034)

Excessive torque boosted
Cause:


  • The torque boost parameter F402 is set too high.

  • The motor has too small impedance.




Remedy:

  • Decrease the setting of F402.
E-21
(0035)

CPU fault 2
Cause:

  • The control CPU is defective.



Remedy:

  • Make a service call.
SOUt
(002F)

Step-out (For PM motor only)
Cause:


  • The motor shaft is locked.

  • One output phase is open.

  • An impact load is applied.




Remedy:


  • Unlock the motor shaft.

  • Check interconnect cables.
OFF

ST terminal OFF
Cause:

  • The ST-CC circuit is opened.



Remedy:

  • Close the ST-CC circuit.
MOFF

Undervoltage in main circuit
Cause:

  • The supply voltage between R, S and T is under voltage.



Remedy:

  • Measure the main circuit supply voltage.
rtry

Retry in process
Cause:


  • The inverter is in the process of retry.

  • A momentary stop occurred.




Remedy:

  • The inverter is normal if it restarts automatically.
Err1

Frequency point setting error alarm
Cause:

  • The frequency setting signals at points 1 and 2 are set too close to each other.



Remedy:

  • Set the frequency setting signals at points 1 and 2 apart from each other.
CLr

Clear command acceptable
Cause:

  • This message is displayed when pressing the STOP key while an error code is displayed.



Remedy:

  • Press the STOP key again to clear the trip.
EOFF

Emergency stop command acceptable
Cause:

  • The operation panel is used to stop operation in automatic or remote control mode.



Remedy:

  • Press the STOP key for an emergency stop. Press any other key to cancel.
HI / LO

Setting error alarm
Cause:

  • An error is found in a setting when data is reading or writing.



Remedy:

  • Check whether the setting is made correctly.
db

DC braking
Cause:

  • DC braking in process.



Remedy:

  • The message goes off in several tens of seconds if no problem occurs.
dbon

Shaft fixing control
Cause:

  • Motor shaft fixing control is in process.



Remedy:

  • Normal if message disappears when stop command is entered.
E1 / E2 / E3

Flowing out of excess number of digits
Cause:

  • The number of digits such as frequencies is more than 4.



Remedy:

  • Lower the frequency free unit magnification F702.
StOP

Momentary power failure slowdown stop
Cause:

  • The slowdown stop prohibition function set with F302 is activated.



Remedy:

  • To restart operation, reset the inverter or input an operation signal again.
LStP

Auto-stop (continuous low-limit frequency)
Cause:

  • The automatic stop function selected with F256 was activated.



Remedy:

  • Deactivate the automatic stop function or increase frequency command.
Init

Parameters in the process of initialization
Cause:

  • Parameters are being initialized to default values.



Remedy:

  • Normal if the message disappears after a while.
E-17

Operation panel key fault
Cause:


  • The RUN or STOP key is held down for more than 20 seconds.

  • The RUN or STOP key is faulty.




Remedy:

  • Check the operation panel.
Atn1

Auto-tuning
Cause:

  • Auto-tuning in process.



Remedy:

  • Normal if the message disappears after a few seconds.