PrF 59 (0x003B) - STO Circuit Fault
+ Causes:
- Different input levels between [STOA] and [STOB].
- Fault in the Safe Torque Off (STO) circuit.
+ Advice:
- Check the wiring and device connections at [STOA]/[STOB] terminals and ensure screws are tightened properly.
- If an internal inverter fault is suspected, contact your Toshiba distributor.

    SOUT 47 (0x002F) - PM Step-Out
+ Causes:
- Rapid load change.
- Sudden acceleration/deceleration.
- Motor shaft locked up.
- Output side phase failure.
+ Advice:
- Increase the acceleration/deceleration time using <ACC: Acceleration time 1> and <dEC: Deceleration time 1>.
- Check and release any lock on the motor.
- Inspect the wiring on the output side for issues.

    UC 29 (0x001D) - Undercurrent
+ Cause: Output current fell below the undercurrent detection level during operation.
+ Advice:
- Inspect the load for any changes or issues.
- Verify that the undercurrent detection settings are correct using <F610: Undercurrent trip>, <F611: Undercurrent detection level>, and <F612: Undercurrent detection time>.

    UP1 30 (0x001E) - Undervoltage (Power Circuit)
+ Cause: Input voltage to the power circuit dropped below acceptable levels.
+ Advice:
- Check the input voltage for stability and correct any issues.
- Ensure the undervoltage detection settings are correct using <F625: Undervoltage detection level> and <F627: Undervoltage trip>.
- To prevent trips during momentary power failures, set <F627> to "0: Disabled" and configure <F301: Auto-restart> and <F302: Regenerative power ride-through level> to "1".


Additional Trip Codes and Solutions

    Ut 60 (0x003C) - Undertorque
+ Cause: The load torque dropped to the undertorque level during operation.
+ Advice:
- Inspect the load side to ensure proper operation.
- Verify that the undertorque detection settings are correct using <F651: Undertorque trip>, <F652: Undertorque detection level during power running>, <F653: Undertorque detection level during regen>, and <F654: Undertorque detection time>.

    UtC3 73 (0x0049) - Undertorque/Undercurrent
+ Cause: The shock monitoring function detected undertorque or undercurrent.
+ Advice:
- Check the load for any irregularities.
- If no issues are found, ensure the shock monitoring function settings are correctly configured, using parameters from <F590: Shock monitoring> to <F598: Shock monitoring detection condition>.

Alarm Information and Solutions

    A-09 - Panel Disconnection Alarm
+ Cause: The cable connecting the inverter and panel was disconnected during operation with a command from the operation panel and extension panel.
+ Advice:
- Check the connection between the inverter and panel to ensure it is secure.

    A-17 - Key Failure Alarm
+ Causes:
- The [RUN] or [STOP/RESET] key on the operation panel was pressed and held for 20 seconds or more.
- The operation panel key has failed.
+ Advice:
- Inspect the operation panel. If the issue persists, contact your Toshiba distributor for assistance.

    A-18 - Analog Input Disconnection Alarm
+ Cause: The input level of terminal [II] dropped to the setting value or less of <F633: II analog input disconnection detection level>.
+ Advice:
- Ensure the signal line connected to terminal [II] is not disconnected.
- Verify that the <F633> setting is correct.

    A-29 - Control Power Supply Option Alarm
+ Causes:
- Control power supply voltage between [+SU] and [CC] is low.
- Incorrect setting of <F647: Control power option error detection>.
+ Advice:
- Check the control power supply voltage between [+SU] and [CC]; it should be 20Vdc or more.
- If the control power option is not used, set <F647> to "0".
+ Note: The "A-29" alarm automatically recovers when the control power supply voltage returns to normal.

    A-43 - Communication Alarm (Embedded Ethernet)
+ Cause: Condition very close to a communication timeout trip.
+ Advice:
- Perform the same measures as for communication timeout "E-43," such as checking Ethernet communication equipment and wiring.

    COFF - Control Power Option Alarm
+ Causes:
- Undervoltage on the control power supply input between [+SU] and [CC].
- Improper setting of <F647: Control power option failure detection>.
+ Advice:
- Ensure the control power supply input voltage between [+SU] and [CC] is 20 Vdc or more.
- If the control power supply option is not used, set <F647> to "0".
+ Note: When [COFF] occurs, turn the power OFF once, and reset.

    MOFF - Undervoltage Alarm
+ Cause: The input voltage to the power circuit declined.
+ Advice:
- Check the input voltage. If no problem is found, there may be an internal error. Contact your Toshiba distributor for further assistance.