Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual page 300

Causes and corrective actions
Operation panel
E.OP1
indication
Name
Communication option fault
Description Stops the inverter output when a communication line fault occurs in the communication option.
Check for a wrong option function setting and operation.
Check that the plug-in option unit 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.
Connect the plug-in option securely.
Corrective action
Check the connection of communication cable.
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.
Check that the plug-in option unit is plugged into the connector securely.
Check point Check for excess electrical noises around the inverter.
Check the switch position for the manufacturer setting of the plug-in option.
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
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.
Operation Panel
E.PE2
Indication
Name Internal board fault
Description When a combination of control board and main circuit board is wrong, the inverter is tripped.
Check point —
Please contact your sales representative.
Corrective action
(For parts replacement, consult the nearest Mitsubishi FA Center.)
.....
Specifications differ according to the date assembled. Refer to page 338 to check the SERIAL number.
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
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 than permissible
Description
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 (use Pr. 502 Stop mode selection at communication error to change).
This function also 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 parameter unit (FR-PU04/FR-PU07) is connected properly.
Check point
Check the Pr. 75 setting.
Corrective action
Connect the parameter unit (FR-PU04/FR-PU07) securely.
300
FR-PU04
Option slot alarm 1
FR-PU07
FR-PU04
Fault 1
FR-PU07
FR-PU04
Corrupt Memry
FR-PU07
FR-PU04 Fault 14
FR-PU07 PR storage alarm
FR-PU04
PU Leave Out
FR-PU07
Refer to the