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Operation panel
indication
Name
Input phase loss
When Pr.872 Input phase loss protection selection is enabled ("1") and one of the three-phase power input
Description
is lost, the inverter output is shut off. This protective function is not available when Pr.872 is set to the initial value
(Pr.872 = "0"). (Refer to
Check point
Check for a break in the cable for the three-phase power supply input.
• Wire the cables properly.
Corrective action
• Repair a break portion in the cable.
Operation panel
E.OHT
indication
Name
External thermal relay operation
While "1" (NC contact) or "2" (NO contact) is set in Pr.876 OH input selection to enable the function, the inverter
output is shut off if output of the device such as a thermostat is input as the OH signal, and the OH signal turns
Description
ON (NO contact input) or turns OFF (NC contact input).
The OH signal function is assigned to the terminal OH in the initial status.
This protective function is not available when Pr.876 is set to the initial value (Pr.876 = "0"). (Refer to
• Check for overheating of the thermostat for overheat protection of peripheral devices.
Check point
• Check that the value "7" (OH signal) is set correctly to any of Pr.178, Pr.187 or Pr.189 (Input terminal function
selection).
• Reduce the load and operation duty.
Corrective action
• Even if the thermostat automatically returns to normal, the converter unit (inverter) will not restart unless it is
reset.
Operation panel
indication
Name
Parameter storage device fault (control circuit board)
Description
The inverter output is shut off if a fault occurs in the parameter stored. (EEPROM failure)
Check point
Check for too many number of parameter write times.
Contact your sales representative.
Set "1" in Pr.342 Communication EEPROM write selection (write to RAM) for the operation which requires
Corrective action
frequent parameter writing via communication, etc. Note that writing to RAM goes back to the initial status at
power OFF.
Operation panel
E.PUE
indication
Name
PU disconnection
• The inverter output is shut off if communication between the operation panel and the converter unit is
interrupted (e.g. by removing the operation panel) when the disconnected PU detection function is valid in
Pr.75 Reset selection/disconnected PU detection/reset limit.
Description
• The inverter output is shut off if communication errors occurred consecutively for more than permissible
number of retries when Pr.121 PU communication retry count ≠ "9999" during the RS-485 communication.
• The inverter output is shut off if communication is broken within the period of time set in Pr.122 PU
communication check time interval during the RS-485 communication via the PU connector.
• Check that the operation panel is connected properly.
Check point
• Check the Pr.75 setting.
Corrective action
Connect the operation panel securely.
Operation panel
E.RET
indication
Name
Retry count excess
The inverter output is shut off if the operation cannot be resumed properly within the number of retries set in Pr.67
Description
Number of retries at fault occurrence. This function is available when Pr.67 is set. This protective function is
not available in the initial setting (Pr.67 = "0").
Check point
Find the cause of the fault occurrence.
Corrective action
Eliminate the cause of the fault preceding this fault indication.
Operation panel
E.PE2
indication
Name
Parameter storage device fault (main circuit board)
Description
The inverter output is shut off if a fault occurs in the parameter stored. (EEPROM failure)
Check point
――――
Corrective action
Contact your sales representative.
E.ILF
page
84.)
E.PE
page
95.)
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
1
2
3
4
5
6
7
8
9
10
147
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