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Causes and corrective actions
Operation panel
E.LF
indication
Name
Output phase loss
If one of the three phases (U, V, W) on the inverter's output side (load side) is lost during inverter operation (except
Description
during DC injection brake operation and when output frequency is under 1Hz), inverter stops the output. Whether the
protective function is used or not is set with Pr. 251 Output phase loss protection selection.
Check the wiring. (Check that the motor is normal.)
Check point
Check that the capacity of the motor used is not smaller than that of the inverter.
Wire the cables properly.
Corrective action
Check the Pr. 251 Output phase loss protection selection setting.
Operation panel
E.OHT
indication
Name
External thermal relay operation
If the external thermal relay provided for motor overheat protection or the internally mounted temperature relay in the
motor, etc. switches on (contacts open), the inverter output is stopped.
Description
Functions when "7" (OH signal) is set to any of Pr. 178 to Pr. 184 (input terminal function selection).
This protective function does not function in the initial status (OH signal is not assigned).
Check for motor overheating.
Check point
Check that the value of 7 (OH signal) is set correctly in any of Pr. 178 to Pr. 184 (input terminal function selection).
Reduce the load and frequency of operation.
Corrective action
Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
Operation panel
E.OP1
indication
Name
Communication option fault
Description
Stops the inverter output when a communication line fault occurs in the communication option.
1. Check for a wrong option function setting and operation.
2. Check that the plug-in option unit is plugged into the connector securely.
Check point
3. Check for a break in the communication cable.
4. Check that the terminating resistor is fitted properly.
1. Check the option function setting, etc.
2. Connect the plug-in option securely.
Corrective action
3. Check the connection of communication cable.
4. Connect the terminating resistor correctly.
Operation panel
E. 1
indication
Name
Option fault
Stops the inverter output if a contact fault or the like of the connector between the inverter and communication option
Description
occurs.
Appears when the switch for the manufacturer setting of the plug-in option is changed.
1. Check that the plug-in option unit is plugged into the connector securely.
Check point
2. Check for excess electrical noises around the inverter.
3. Check the switch position for the manufacturer setting of the plug-in option.
1. Connect the plug-in option securely.
2. Take measures against noises if there are devices producing excess electrical noises around the inverter.
If the problem still persists after taking the above measure, please contact your sales representative.
Corrective action
3. Return the switch position for the manufacturer setting of the plug-in option to the initial status. (
instruction manual of each option)
Operation panel
E.PE
indication
Name
Parameter storage device fault (control circuit board)
Description
Stops the inverter output if fault occurred in the parameter stored. (EEPROM fault)
Check point
Check for too many number of parameter write times.
Please contact your sales representative.
Corrective action
When performing parameter write frequently for communication purposes, set "1" in Pr. 342 to enable RAM write. Note
that powering OFF returns the inverter to the status before RAM write.
104
FR-PU04
E.LF
FR-PU07
FR-PU04
OH Fault
FR-PU07
FR-PU04
Option slot alarm 1
FR-PU07
FR-PU04
Fault 1
FR-PU07
FR-PU04
Corrupt Memry
FR-PU07
Refer to the

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