> Operation Panel Indication: E. RET FR-PU04 Retry No Over

+ Name: Retry count exceeded

- Description: If operation cannot be resumed properly within the number of retries set, this function stops the inverter output.

++ Check Point: Find the cause of alarm occurrence.

* Corrective Action: Eliminate the cause of the error preceding this error indication.

> Operation Panel Indication: E. CPU FR-PU04 CPU Fault

+ Name: CPU error

- Description: If the arithmetic operation of the built-in CPU does not end within a predetermined period, the inverter self-determines it as an alarm and stops the output.

* Corrective Action: Please contact your sales representative.

Major Faults

> Operation Panel Indication: E. 3 FR-PU04 Fault 3

+ Name: Option fault

- Description: Also stops the inverter output if the dedicated option used in the inverter results in a setting error or connection (connector) fault.

+ Check that the function setting and operation of the option are correct.
+ Check that the communication option is plugged into the connector securely.

* Corrective Action:
+ Connect the communication option securely.
+ Contact your sales representative.

> Operation Panel Indication: E. 6 FR-PU04 Fault 6

+ Name: CPU error

- Description: This function stops the inverter output if a communication error occurs in the built-in CPU.

* Corrective Action: Please contact your sales representative.

> Operation Panel Indication: E. 7 FR-PU04 Fault 7

+ Name: CPU error

- Description: This function stops the inverter output if a communication error occurs in the built-in CPU.

* Corrective Action: Please contact your sales representative.

> Operation Panel Indication: E. LF FR-PU04 E. LF

+ Name: Output phase failure protection

- Description: This function stops the inverter output if one of the three phases (U, V, W) on the inverter's output side (load side) results in an open phase.

+ Check the wiring (Check the motor for a fault.)
+ Check that the capacity of the used motor is not smaller than the inverter capacity.

* Corrective Action:
+ Wire the cables properly.
+ Check the setting of Pr. 251 "output phase failure protection selection".

Minor Fault

> Operation Panel Indication: FN FR-PU04 Fan Failure
+ Name: Fan fault
- Description: For the inverter which contains a cooling fan, FN appears on the operation panel when the cooling fan stops due to a fault or operates differently from the setting of Pr. 244 "cooling fan operation selection".
++ Check Point: Check the cooling fan for a fault.
* Corrective Action: Change the fan.


> Operation Panel Indication: OL FR-PU04 OL

+ Name: Stall prevention (overcurrent)

- Description:
+ During acceleration: If a current of more than 150% (Note 5) of the rated inverter current flows in the motor, this function stops the increase in frequency until the overload current reduces to prevent the inverter from resulting in overcurrent shut-off. When the overload current has reduced below 150%, this function increases the frequency again.
+ During constant-speed operation: If a current of more than 150% (Note 5) of the rated inverter current flows in the motor, this function lowers the frequency until the overload current reduces to prevent overcurrent shut-off. When the overload current has reduced below 150%, this function increases the frequency up to the set value.
+ During deceleration: If a current of more than 150% (Note 5) of the rated inverter current flows in the motor, this function stops the decrease in frequency until the overload current reduces to prevent the inverter from resulting in overcurrent shut-off. When the overload current has reduced below 150%, this function decreases the frequency again.

++ Check Point: Check the motor for use under overload.

* Corrective Action: The acceleration/deceleration time may change. Increase the stall prevention operation level with Pr. 22 "stall prevention operation level", or disable stall prevention with Pr. 156 "stall prevention operation selection".

    Note: The stall prevention operation current can be set as desired. It is factory-set to 150%.

> Operation Panel Indication: oL FR-PU04 oL

+ Name: Stall prevention (overvoltage)

- Description: During deceleration, if the regenerative energy of the motor increases too much to exceed the brake capability, this function stops the decrease in frequency to prevent overvoltage shut-off. As soon as the regenerative energy has reduced, deceleration resumes.

++ Check Point: Check for sudden speed reduction.

* Corrective Action: The deceleration time may change. Increase the deceleration time using Pr. 8 "deceleration time".


> Operation Panel Indication: PS FR-PU04 PS

+ Name: PU stop

- Description: A stop made by pressing the STOP RESET key of the PU has been set in Pr. 75 "PU stop selection".

++ Check Point: Check for a stop made by pressing the STOP RESET key of the operation panel during external operation.

* Corrective Action: Refer to page 102.

> Operation Panel Indication: Err.

- Description: This alarm appears if:
+ The RES signal is on;
+ You attempted to set any parameter value in the external operation mode;
+ You attempted to change the operation mode during operation;
+ You attempted to set any parameter value outside its setting range.
+ You attempted to set any parameter value during operation (while signal STF or STR is ON).
+ You attempted to set any parameter value while parameter write is being inhibited in Pr. 77 "parameter write inhibit selection".

* Corrective Action: Perform operation correctly.

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