Toshiba AS1 Drives Fault Codes:
| Fault Code and Meaning | Cause and Remedy |
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| OC1, OC1P Overcurrent during acceleration | Cause: The acceleration time (acc) is too short; V/f setting is improper; Restart signal input to rotating motor; Special motor used; Manual torque boost (vb) is large. Remedy:
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| OC2, OC2P Overcurrent during deceleration | Cause: The deceleration time (dec) is too short. Remedy:
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| OC3, OC3P Overcurrent during fixed speed | Cause: The load fluctuates abruptly; The load is in an abnormal condition. Remedy:
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| OC1P, OC2P, OC3P (Note) Component Failure / Overheat | Cause: A main circuit element is defective; Overheat protection is activated. Remedy:
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| OCA1 U-phase arm short-circuit | Cause: A main circuit element is defective (U-phase). Remedy:
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| OCA2 V-phase arm short-circuit | Cause: A main circuit element is defective (V-phase). Remedy:
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| OCA3 W-phase arm short-circuit | Cause: A main circuit element is defective (W-phase). Remedy:
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| OCL Loaded side overcurrent at start time | Cause: Insulation of output main circuit or motor is defective; Motor has too small impedance; Drive circuit board damaged. Remedy:
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| OCr Dynamic braking element overcurrent (110kW or larger) | Cause: PB-PC/+ circuit is shorted; Resistor with resistance smaller than minimum allowable is connected; Parameter Pb set to 1 or 2 without connecting brake. Remedy:
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| OH Overheating | Cause: Cooling fan does not rotate; Ambient temperature too high; Vent blocked; Heat generating device nearby; Thermistor disconnected. Remedy:
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| OH2 Thermal trip stop command from external device | Cause: Input signal impressed at control input terminal PTG; Thermal trip command (input function 46 or 47) issued by external device. Remedy:
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| OL1 Inverter overload | Cause: Rapid acceleration; DC braking amount too large; V/f setting improper; Restart signal input to rotating motor; Load too large. Remedy:
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| OL2 Motor overload | Cause: V/f parameter improperly set; Motor is locked up; Low-speed operation performed continuously; Excessive load applied. Remedy:
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| OLr Dynamic braking resistor overload | Cause: Rapid deceleration is operated; Dynamic braking is too large. Remedy:
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| OP1 Overvoltage during acceleration | Cause: Input voltage fluctuates abnormally (Power supply > 500kVA, capacitor opened/closed, thyrister connected); Restart signal input to rotating motor. Remedy:
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| OP2 Overvoltage during deceleration | Cause: Deceleration time (dec) too short; Dynamic braking resistor has large resistance; Pb is OFF; Overvoltage limit F305 is OFF; Input voltage fluctuates. Remedy:
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| OP3 Overvoltage during fixed speed operation | Cause: Input voltage fluctuates abnormally; Motor is in regenerative state (load pushes motor). Remedy:
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| Ot Overtorque | Cause: Overtorque reaches detection level; Stall prevention performed longer than time set with F452. Remedy:
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| UC Low current operation | Cause: Output current decreased to low-current detection level during operation. Remedy:
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| UP1 Undervoltage (main circuit) | Cause: Input voltage too low; Momentary power failure occurs longer than detection time F628. Remedy:
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| E Emergency stop | Cause: Inverter stopped by panel during auto/remote; Stop command (terminal function 20 or 21) issued by external device. Remedy:
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| EEP1 EEPROM error | Cause: A data writing error occurs. Remedy:
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| EEP2 Initial read error | Cause: Some internal data is corrupted; Power was turned off while typ was being set. Remedy:
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| EEP3 Initial read error | Cause: Some internal data is corrupted. Remedy:
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| EF1, EF2 Ground fault | Cause: A current leaked from an output cable or the motor to ground. Remedy:
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| EPH0 Output phase failure | Cause: A phase failure occurred in the output line of the main circuit. Remedy:
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| EPH1 Input phase failure | Cause: A phase failure occurred in the input line of the main circuit. Remedy:
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| Err2 Main unit RAM fault | Cause: The control RAM is defective. Remedy:
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| Err3 Main unit ROM fault | Cause: The control ROM is defective. Remedy:
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| Err4 CPU fault | Cause: The control CPU is defective. Remedy:
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| Err5 Communication time-out error | Cause: Normal communication was not possible for the time set by F803. Remedy:
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| Err6 Gate array fault | Cause: Main gate array is defective. Remedy:
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| Err7 Output current detector error | Cause: The main output current detector is defective. Remedy:
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| Err8 Optional unit fault | Cause: An optional device has failed (such as a communication device). Remedy:
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| Etn Tuning error | Cause: Motor capacity connected is 2 notches or more smaller than inverter; Motor is not 3-phase inductive; Tuning performed while motor running. Remedy:
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| Etn1 Tuning detection error | Cause: Some parameters (F410-F413) not detected; Motor capacity too small; Motor not 3-phase inductive; No motor connected; Cables too long (>30m); Motor running. Remedy:
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| Etn2 Motor constant value error | Cause: Some detection values (F410-F413) beyond limits; Motor capacity too small; Motor not 3-phase inductive; Cables too long (>30m); Motor running. Remedy:
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| Etn3 Motor constant setting error | Cause: Some items indicated on the motor nameplate are not entered correctly. • Base frequency (uL) • Base frequency voltage 1 (uLu) • Motor rated capacity (F405) • Motor rated current (F406) • Motor rated speed (F407) Remedy:
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| Etyp Inverter type error | Cause: Is circuit board (or main circuit/drive circuit board) replaced? Remedy:
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| E-10 Analog input terminal overvoltage | Cause: Overrated voltage is applied to analog input. Remedy:
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| E-11 Sequence error | Cause: The signal from system is not inputted into input terminals. The input terminal function (130, 131) is not set up. A value other than 0.0 is specified for F630, although the brake answer function is not used. Remedy:
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| E-12 Encoder error | Cause: Disconnection of encoder circuit. The encoder is not connected correctly. Remedy:
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| E-13 Speed error (Over speed) | Cause: Encoder error (inverter error). Remedy:
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| E-17 Key failure alarm | Cause: The same key is input continuously more than 20 seconds. Remedy:
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| E-18 Terminal input error | Cause: Braking down of a wire for VI/II input signal. Terminal circuit board comes off and falls. P24 overcurrent. Remedy:
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| E-19 Abnormal CPU2 communication | Cause: An error arises during CPU2 communication. Remedy:
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| E-20 V/f control error | Cause: An internal control error occurs. Remedy:
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| E-21 CPU1 fault | Cause: A software error occurs in the control CPU. Remedy:
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| E-22 Abnormal logic input voltage | Cause: An abnormal voltage is applied to the control logic input terminal. Remedy:
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| E-23 Option 1 error | Cause: Expansion I/O card 1 is defective. Remedy:
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| E-24 Option 2 error | Cause: Expansion I/O card 2 is defective. Remedy:
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| E-25 Stop position retaining error | Cause: A deviation error occurs during stop position retaining control. The stop position adjustment range specified with F381 is too narrow. Creeping speed is too fast. Remedy:
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| E-26 CPU2 fault | Cause: Motor control CPU is defective. The drive circuit board in the inverter was damaged. Remedy:
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| E-29 Control power backup undervoltage error | Cause: The control voltage between +SU and CC terminals is too low. Control power is not supplied through +SU and CC terminals. The parameter F647 is not set correctly. Remedy:
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| SOut Step-out (for PM motors only) | Cause: The motor shaft is locked. One output phase is open. An impact load is applied. Remedy:
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| PrF Power removal error | Cause: Error of power removal signal. Remedy:
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| OFF ST signal OFF | Cause: ST terminal (terminal to which the ST function is assigned) is in open-circuit. Remedy:
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| PrA PWR signal OFF | Cause: PWR terminal is in open-circuit. Remedy:
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| COFF Control power backup undervoltage | Cause: The control voltage between +SU and CC terminals is too low. Control power is not supplied through +SU and CC terminals. The parameter F647 is not set correctly. Remedy:
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| MOFF Undervoltage in main circuit | Cause: The supply voltage between R, S and T is under voltage. Trouble of rush current restraint circuit or DC circuit fuse. Remedy:
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| rtry Retry | Cause: The inverter is in the process of retry. A momentary stop occurred. Remedy:
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| Err1 Point setting alarm | Cause: The frequency setting signals at points 1 and 2 are set too close to each other. Remedy:
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| CLr Clear enabling indication | Cause: This message is displayed when pressing the STOP key while an error code is displayed. Input terminal RES signal is ON during trip display. Remedy:
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| EOFF Emergency stop enabling indication | Cause: The operation panel is used to stop the operation in automatic control or remote control mode. Remedy:
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| HI / LO Setting error alarm | Cause: An error is found in a setting when data is reading or writing. (Error code and data displayed alternately). Remedy:
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| db DC braking | Cause: DC braking in process. Remedy:
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| dbOn Shaft fixing in control | Cause: Motor shaft fixing control is in process. Remedy:
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| E1 / E2 / E3 Panel indication overflow | Cause: The digit number of the item displayed (e.g., frequency) is in excess of the specified digit number. Remedy:
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| init Parameters in the process of initialization | Cause: Parameters are being initialized to default values. Remedy:
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| Atn In auto-tuning 1 | Cause: Auto-tuning 1 in process. Remedy:
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| LStp Auto-stop because of continuous operation at lower-limit | Cause: The automatic stop function of F256 is being performed. Remedy:
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| StOP Momentary power failure slowdown stop | Cause: The deceleration stop function of uuc (regenerative power ride-through control) is activated. Remedy:
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| HEAd / End Display of first/last data items | Cause: First and last data in the AuH group. Remedy:
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| tun During learning | Cause: Learning for brake sequence operation or light-load high-speed operation is currently in progress. Remedy:
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| tun1 Brake sequence learning error | Cause: Braking operation is not performed normally. The load is too heavy. There are some operation errors. Remedy:
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| tun2 Light-load high-speed learning operation error | Cause: There are some errors in the operation for learning for light-load high-speed operation. Remedy:
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| tun3 Light-load high-speed learning overload error | Cause: Learning operation for light-load high-speed operation is performed while the load is lifted. Motor constants (uL, uLv, F405 to F413) are not entered correctly. Remedy:
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| UndO Key operation permitted temporarily | Cause: This message appears if the ENTER key is pressed and held down for 5 seconds or more when key operation is prohibited by F737. Remedy:
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| C Overcurrent pre-alarm | Cause: Same as OC (Overcurrent). Remedy:
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| P Overvoltage pre-alarm / PBR operation level | Cause: Same as OP (Overvoltage). P blink while PBR is operating is not an error. Remedy:
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| L Overload pre-alarm | Cause: Same as OL1 and OL2 (Overload). Remedy:
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| H Overheat pre-alarm | Cause: Same as OH (Overheat). Remedy:
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| t Communication error | Cause: Various transmission errors occur when computer is linked up with inverter system. Various transmission errors occur in inverter to inverter communication (slave side). Time-out or trip in master side. Remedy:
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