Hi everyone,

Error Codes and Solutions

OL nt: Motor overload
- V/f is incorrect.
- The motor is constrained.
- Continuous running at low speeds.
- The motor is being operated in the overload area.

    Solutions:
- Check the V/f pattern setting.
- Check the load equipment.
- Adjust ULFULF according to the motor's overload handling characteristics at low speeds.

OCr: Dynamic braking resistor overcurrent trip
- The dynamic braking circuit transistor is faulty.

    Solutions:
- Repair is required.

OLr: Dynamic braking resistor overload trip
- The motor decelerated suddenly.
- The DC injection current is too high.

    Solutions:
- Increase the deceleration time dECdEC.
- Decrease the DC injection current dCIdCI and DC injection time dCtdCt.

OH: Overheat
- The cooling fan is not working.
- The fan ventilation inlet is blocked.
- Another heat-generating device is located nearby.
- The thermistor in the unit is dislocated.

    Solutions:
- Check the cooling fan.
- Check the inverter installation space.
- Do not place heat-generating devices near the inverter.
- Check the main circuit PCB CN6.

EFU: DC fuse cut
- The DC fuse is cut.

    Solutions:
- Replacement of the fuse is required.

E: Emergency stop
- The motor was stopped during automatic run or remote operation with the panel.

    Solutions:
- Reset.

EEP 1: EEPROM fault
- An error occurred during writing of data to the EEPROM.

    Solutions:
- Cycle power to the unit OFF/ON. If the error persists, repair is required.

EEP 1: EEPROM fault
- An error occurred during writing of data to the EEPROM.

    Solutions:
- Cycle power to the unit OFF/ON. If the error persists, repair is required.

EEP 2: Initial read fault
- Fault in the internal data.

    Solutions:
- Repair is required.

Err 2: RAM fault
- Fault in the microcontroller RAM.

    Solutions:
- Repair is required.

Err 3: ROM fault
- Fault in the microcontroller ROM.

    Solutions:
- Repair is required.

Err 4: CPU fault
- Fault in the microcontroller CPU.

    Solutions:
- Repair is required.

Err 5: Communication interruption error
- A fault occurred during communication operation.

    Solutions:
- Check the communication device and wiring, etc.

Err 6: Gate array fault
- Fault in the main gate array.

    Solutions:
- Repair is required.

Err 7: Output current detection device fault
- Fault in the output current detection device.

    Solutions:
- Repair is required.

Err 8: Option PCB fault
- Fault in an option PCB.

    Solutions:
- Check the option PCB connections, etc.

Err 9: Optional ROM drop-off error
- Optional ROM is not mounted correctly. (Only for the software version 120)

    Solutions:
- Remount the optional ROM, then enter 3 on F−4F−4 of Pr.FPr.F to clear the data.

*UC: Low current run condition trip
- The output current dropped to the low current detection level while running.

    Solutions:
- Check that it is adjusted to the detection level suitable for the system LCTLCT, ULCULC. If the setting has no abnormality, repair is required.

+ Toshiba VF-A5 User Manual  >>

+ VF-A5 Fault codes 1 >>

+ VF-A5 Fault codes 2 >>

+ VF-A5 Fault codes 3 >>

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+ Used VFD Models

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