Mitsubishi FR-A721-11K Instruction Manual page 159

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
152
E.GF
Output side earth (ground) fault overcurrent
This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth
(ground) fault that occurred on the inverter's output (load) side.
Check for an earth (ground) fault in the motor and connection cable.
Remedy the earth (ground) fault portion.
E.LF
Output phase loss
This function stops the inverter output if one of the three phases (U, V, W) on the inverter's output side
(load side) is lost.
Check the wiring (Check that the motor is normal.)
Check that the capacity of the motor used is not smaller than that of the inverter.
Check if a start command is given to the inverter while the motor is coasting.
Wire the cables properly.
Check the Pr. 251 Output phase loss protection selection setting.
Input a start command after the motor stops. Alternatively, set the automatic restart after
instantaneous power failure/flying start function. (Refer to Chapter 4 of
(Applied).)
E.OHT
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.
This function is available when "7" (OH signal) is set in any of Pr. 178 to Pr. 189 (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 that the value of 7 (OH signal) is set correctly in any of Pr. 178 to Pr. 189 (input terminal function selection).
Reduce the load and operating duty.
Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
E.PTC
PTC thermistor operation
Stops the inverter output when the motor overheat status is detected for 10s or more by the external
PTC thermistor input connected to the terminal AU.
This fault is available when "63" is set in Pr. 184 AU terminal function selection and AU/PTC switchover
switch is set in PTC side. When the initial value (Pr. 184 = "4") is set, this protective function is not
available.
Check the connection between the PTC thermistor switch and thermal protector.
Check the motor for operation under overload.
Is valid setting ( = 63) selected in Pr. 184 AU terminal function selection ? (Refer to Chapter 4 of
Instruction Manual (Applied).)
Reduce the load weight.
FR-PU04
Ground Fault
FR-PU07
FR-PU04
E. LF
FR-PU07
FR-PU04
OH Fault
FR-PU07
FR-PU04 Fault 14
FR-PU07 PTC activated
the Instruction Manual
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