Mitsubishi Electric FR-CC2-N Series, Инструкция по эксплуатации

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147
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
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10
Operation panel
indication
E.ILF
Name Input phase loss
Description
When Pr.872 Input phase loss protection selection is enabled ("1") and one of the three-phase power input
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 page 84 .)
Check point Check for a break in the cable for the three-phase power supply input.
Corrective action
• Wire the cables properly.
• Repair a break portion in the cable.
Operation panel
indication
E.OHT
Name External thermal relay operation
Description
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
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 page 95 .)
Check point
• Check for overheating of the thermostat for overheat protection of peripheral devices.
• Check that the value "7" (OH signal) is set correctly to any of
Pr.178, Pr.187 or Pr.189 (Input terminal function
selection) .
Corrective action
• Reduce the load and operation duty.
• Even if the thermostat automatically returns to normal, the converter unit (inverter) will not restart unless it is
reset.
Operation panel
indication
E.PE
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.
Corrective action
Contact your sales representative.
Set "1" in
Pr.342 Communication EEPROM write selection (write to RAM) for the operation which requires
frequent parameter writing via communication, etc. Note that writing to RAM goes back to the initial status at
power OFF.
Operation panel
indication
E.PUE
Name PU disconnection
Description
• 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 .
• 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 point
• Check that the operation panel is connected properly.
• Check the
Pr.75 setting.
Corrective action Connect the operation panel securely.
Operation panel
indication
E.RET
Name Retry count excess
Description
The inverter output is shut off if the operation cannot be resumed properly within the number of retries set in Pr.67
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
indication
E.PE2
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.