Mitsubishi Electric FR-D720-0.1K Instruction Manual page 265

Operation panel
E.OHT
indication
Name
External thermal relay operation
If the external thermal relay provided for motor overheat protection or the internally mounted temperature relay in the
motor, etc. switches ON (contacts open), the inverter output is stopped.
Description
This function is available when "7" (OH signal) is set in any of Pr. 178 to Pr. 182 (input terminal function selection).
When the initial value (without OH signal assigned) is set, this protective function is not available.
Check for motor overheating.
Check point
Check that the value of 7 (OH signal) is set correctly in any of Pr. 178 to Pr. 182 (input terminal function selection).
Reduce the load and frequency of operation.
Corrective action
Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
Operation panel
E.PTC
indication
Name PTC thermistor operation
Inverter trips when resistance of PTC thermistor connected between terminal 2 and terminal 10 is more than the
Description
value set in Pr. 561 PTC thermistor protection level. This protective function does not function when Pr. 561 setting is
initial value (Pr. 561 = "9999").
Check the connection of the PTC thermistor.
Check point Check the Pr. 561 PTC thermistor protection level setting.
Check the motor for operation under overload.
Corrective action
Reduce the load weight.
Operation panel
E.PE
indication
Name
Parameter storage device fault (control circuit board)
Description Appears when a fault occurred in the stored parameters. (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.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 (FR-PU04/FR-PU07) 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 cable is connected properly.
Check the Pr. 75 setting.
Check point Check that RS-485 communication data is correct. And check that the settings of communication parameter at
inverter match settings of the computer.
Check that data is transmitted from the computer within a time set in Pr. 122 PU communication check time interval.
Connect the parameter unit cable securely.
Corrective action Check the communication data and communication settings.
Increase the Pr. 122 PU communication check time interval setting. Or set "9999" (no communication check).
Operation panel
E.RET
indication
Name
Retry count excess
If operation cannot be resumed properly within the number of retries set, this function trips the inverter.
Description 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 does not function.
Check point Find the cause of fault occurrence.
Corrective action Eliminate the cause of the error preceding this error indication.
Causes and corrective actions
FR-PU04
OH Fault
FR-PU07
FR-PU04 Fault 14
FR-PU07 PTC activated
FR-PU04
Corrupt Memry
FR-PU07
FR-PU04
PU Leave Out
FR-PU07
FR-PU04
Retry No Over
FR-PU07
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