Etn3 86 (0x0056) - Auto-Tuning Error 3
+ Causes:
- <vL: Base frequency 1> or <F417: Motor rated speed> settings do not match the motor rating.
- Power is not supplied.
+ Advice:
- Set <vL: Base frequency 1> and <F417: Motor rated speed> according to the motor rating.
- Ensure power is supplied.

    EtyP 41 (0x0029) - Inverter Type Error
+ Causes:
- Internal error exists.
- Printed circuit board was replaced.
+ Advice:
- Contact your Toshiba distributor for replacing the printed circuit board if needed.
- Set <tyP: Default setting> to "6: Initialize typeform."

    OC1 1 (0x0001) - Overcurrent (During Acceleration)
+ Causes:
- Short acceleration time.
- <Pt: V/f Pattern> does not match the machinery.
- Attempted to start a rotating motor after a momentary power failure.
- Attempted to run a special motor with low impedance.
- Attempted to run a low inductance motor like a high-speed motor.
- When <Pt> = "11", PG polarity is opposite.
- Short circuit detection issues at start.
- Possible grounding fault.
- Leakage current due to long motor cable.
+ Advice:
- Increase acceleration time using <ACC: Acceleration time 1>.
- Set <Pt: V/f Pattern> appropriately for the machinery.
- Configure <F301: Auto-restart> and <F302: Regenerative power ride-through> = "1" if necessary.
- Adjust <vb: Manual torque boost 1> and perform auto-tuning with <F400: Offline auto-tuning>.
- Check for grounding faults and refer to section [2.4.3] for leakage current measures.

    OC2 2 (0x0002) - Overcurrent (During Deceleration)
+ Causes:
- Short deceleration time.
- Attempted to run a low inductance motor.
- PG polarity is opposite when <Pt> = "11".
- Short circuit detection issues at start.
- Possible grounding fault.
- Leakage current due to long motor cable.
+ Advice:
- Increase deceleration time using <dEC: Deceleration time 1>.
- Consider a larger capacity inverter.
- Check for grounding faults and refer to section [2.4.3] for leakage current measures.

    OC3 3 (0x0003) - Overcurrent (During Constant Speed Running)
+ Causes:
- Rapid load changes.
- Machinery error (e.g., something got stuck).
- Attempted to run a low inductance motor.
- PG polarity is opposite when <Pt> = "11".
- Short circuit detection issues at start.
- Possible grounding fault.
- Leakage current due to long motor cable.
+ Advice:
- Suppress load fluctuations.
- Inspect the machinery for issues.
- Consider a larger capacity inverter.
- Check for grounding faults and refer to section [2.4.3] for leakage current measures.

    OCA1 5 (0x0005) - Overcurrent (U-Phase Arm)
+ Cause: Fault in IGBT in U-phase, indicating an internal inverter issue.
+ Advice: Contact your Toshiba distributor.

    OCA2 6 (0x0006) - Overcurrent (V-Phase Arm)
+ Cause: Fault in IGBT in V-phase, indicating an internal inverter issue.
+ Advice: Contact your Toshiba distributor.

    OCA3 7 (0x0007) - Overcurrent (W-Phase Arm)
+ Cause: Fault in IGBT in W-phase, indicating an internal inverter issue.
+ Advice: Contact your Toshiba distributor.

    OCL 4 (0x0004) - Overcurrent (Load Side at Startup)
+ Causes:
- Short circuit on the output side.
- Defective insulation in the motor and output side wiring.
- Low motor impedance.
+ Advice:
- Check the wiring on the output side for short circuits.
- Inspect the insulation on the output side.
- Set <F613: Short circuit detection at start> to "2" or "3".

    OCr 36 (0x0024) - Overcurrent (Braking Resistor)
+ Causes:
- Braking resistor or optional braking unit issues:
-     Not connected.
-     Disconnected connection.
-     Resistance value below minimum allowable level.
- Short circuit between [PB] and [PC/-].
- IGBT fault in the dynamic braking drive circuit control.
+ Advice:
- Ensure an adequate braking resistor or unit is connected. If unnecessary, set "Disabled" in <F304>.
- Check the braking resistor's impedance and wiring for problems.
- For internal inverter faults, contact your Toshiba distributor.

Note: This trip cannot be reset. To clear the trip, turn the power off and then back on.

    OH 16 (0x0010) - Overheat
+ Causes:
- Cooling fan malfunction.
- High ambient temperature.
- Blocked cooling fan vent.
- Nearby heating units.
+ Advice:
- Replace the cooling fan if it's not working during operation.
- Lower the ambient temperature and reset after the inverter cools down.
- Ensure the cooling fan vent is not blocked.
- Relocate other heating units away from the inverter.

    OH2 46 (0x002E) - External Thermal Trip
+ Cause: An external thermal trip signal was input.
+ Advice: Ensure the motor is not overloaded.