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Causes and corrective actions
5
PROTECTIVE FUNCTIONS
Operation Panel
Indication
E.OP1
FR-PU04
FR-PU07
Option 1 Fault
Name
Communication option fault
Description
Stops the inverter output when a communication line fault occurs in the communication option.
Check point
· Check for a wrong option function setting and operation.
· Check that the plug-in option is plugged into the connector securely.
· Check for a break in the communication cable.
· Check that the terminating resistor is fitted properly.
Corrective action
· Check the option function setting, etc.
· Connect the plug-in option securely.
· Check the connection of communication cable.
Operation Panel
Indication
E. 1
FR-PU04
FR-PU07
Fault 1
Name
Option fault
Description
Stops the inverter output if a contact fault or the like of the connector between the inverter and
communication option occurs.
Appears when the switch for the manufacturer setting of the plug-in option is changed.
Check point
· Check that the plug-in option is plugged into the connector securely.
· Check for excess electrical noises around the inverter.
Corrective action
· Connect the plug-in option securely.
· 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
or distributor.
· Return the switch position for the manufacturer setting of the plug-in option to the initial status. (Refer
to instruction manual of each option)
Operation Panel
Indication
E.PE
FR-PU04
FR-PU07
Corrupt Memry
Name
Parameter storage device fault (control circuit board)
Description Trips when a fault occurred in the parameter stored. (EEPROM failure)
Check point
Check for too many number of parameter write times.
Corrective action
Please contact your sales representative.
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.
Operation Panel
Indication
E.PE2
FR-PU04 Fault 14
FR-PU07 PR storage alarm
Name
Parameter storage device fault (main circuit board)
Description
Trips when a fault occurred in the parameter stored. (EEPROM failure)
Check point ——————
Corrective action
Please contact your sales representative.
Operation Panel
Indication
E.PUE
FR-PU04
FR-PU07
PU Leave Out
Name
PU disconnection
Description
· This function stops the inverter output if communication between the inverter and PU is suspended,
e.g. the operation panel and parameter unit is disconnected, when "2", "3", "16" or "17" was set in Pr.
75 Reset selection/disconnected PU detection/PU stop selection. This protective function is not available in
the initial setting (Pr. 75 = "14").
· This function stops the inverter output when communication errors occurred consecutively for more
than permissible number of retries when a value other than "9999" is set in Pr. 121 Number of PU
communication retries during the RS-485 communication with the PU connector.
· This function stops the inverter output if communication is broken for the period of time set in Pr. 122
PU communication check time interval during the RS-485 communication with the PU connector.
Check point
· Check that the FR-DU07 or parameter unit (FR-PU04/FR-PU07) is fitted tightly.
· Check the Pr. 75 setting.
Corrective action
Fit the FR-DU07 or parameter unit (FR-PU04/FR-PU07) securely.
Operation Panel
Indication
E.RET
FR-PU04
FR-PU07
Retry No Over
Name
Retry count excess
Description
If operation cannot be resumed properly within the number of retries set, this function trips the inverter.
This function is available only when Pr. 67 Number of retries at fault occurrence is set. When the initial
value (Pr. 67 = "0") is set, this protective function is not available.
Check point
Find the cause of fault occurrence.
Corrective action Eliminate the cause of the fault preceding this error indication.