Mitsubishi Electric FR-A720-0.4K Instruction Manual page 424

Operation Panel
E.OP3
Indication
Name
Communication option fault
Description
Stops the inverter output when a communication line error occurs in the communication option.
· Check for a wrong option function setting and operation.
· Check that the plug-in option is plugged into the connector securely.
Check point
· Check for a break in the communication cable.
· Check that the terminating resistor is fitted properly.
· Check the option function setting, etc.
Corrective action
· Connect the plug-in option securely.
· Check the connection of communication cable.
Operation Panel E. 1 to
Indication E. 3
Name
Option fault
Stops the inverter output if a contact fault, etc. of the connector between the inverter and plug-in option
Description
occurs or if a communication option is fitted to the connector 1 or 2.
Appears when the switch for the manufacturer setting of the plug-in option is changed.
· Check that the plug-in option is plugged into the connector securely.
(1 to 3 indicate the option connector numbers.)
Check point
· Check for excess electrical noises around the inverter.
· Check that the communication option is not fitted to the connector 1 or 2.
· 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
Corrective action
or distributor.
· Fit the communication option to the connector 3.
· 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
E.PE
Indication
Name Parameter storage device fault (control circuit board)
Description Stops the inverter output if fault occurred in the parameter stored. (EEPROM failure)
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.
Operation Panel
E.PE2
Indication
Name Parameter storage device fault (main circuit board)
Description Stops the inverter output if fault occurred in the parameter stored. (EEPROM failure)
Check point
——————
Corrective action
Please contact your sales representative.
Operation Panel
E.PUE
Indication
Name PU disconnection
· 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 function stops the inverter output when communication errors occurred consecutively for more
Description
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 within the period of time set in Pr.
122 PU communication check time interval during the RS-485 communication with the PU connector.
· Check that the FR-DU07 or parameter unit (FR-PU04/FR-PU07) is connected properly.
Check point
· Check the Pr. 75 setting.
Corrective action
Fit the FR-DU07 or parameter unit (FR-PU04/FR-PU07) securely.
Causes and corrective actions
FR-PU04
Option3 Fault
FR-PU07
to
FR-PU04
Fault 1 to Fault 3
FR-PU07
FR-PU04
Corrupt Memry
FR-PU07
FR-PU04 Fault 14
FR-PU07 PR storage alarm
FR-PU04
PU Leave Out
FR-PU07
5
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