Mitsubishi Electric FR-F740 EC Instruction Manual page 583

Troubleshooting
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
FR-F700 EC
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) opens.
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.
Wire the cables properly.
Check the Pr. 251 "Output phase loss protection selection" setting.
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 out-
put is stopped.
Functions when "7" (OH signal) is set to any of Pr. 178 to Pr. 189 (input terminal function
selection). When the initial value (without OH signal assigned) is set, this protective func-
tion does not function.
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
Trips when the motor overheat status is detected for 10s or more by the external PTC ther-
mistor input connected to the terminal AU.
This fault functions 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 pro-
tective function does not function.
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"?
Reduce the load weight.
Causes and corrective actions
FR-PU04
—
FR-PU07(-01)
FR-PU04
OH Fault
FR-PU07(-01)
FR-PU04 Fault 14
FR-PU07(-01) PTC activated
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