245
5
TROUBLESHOOTING
Causes and corrective actions
Operation panel
indication
E.LF
FR-PU07 E.LF
Name
Output phase loss
Description
If one of the three phases (U, V, W) on the drive unit's output side (load side) is lost during drive unit operation
(except during DC injection brake operation and when the output speed is 30r/min or less), the drive unit stops the
outputs. Whether the protective function is used or not is set with Pr.251 Output phase loss protection selection.
Check point
Check the wiring. (Check that the motor is normal.)
Check if the correct drive unit capacity is connected with the motor.
Check if a start command is given to the drive unit while the motor is coasting.
Corrective action
Wire the cables properly.
Choose the drive unit and motor capacities that match.
Input a start command after the motor stops.
Operation panel
indication
E.OHT
FR-PU07 OH Fault
Name
External thermal relay operation
Description
If the external thermal relay provided for motor overheat protection or an internally provided thermal relay in the
motor, etc. switches ON (contacts open), the drive unit outputs are stopped.
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 point
Check for motor overheating.
Check that the value of 7 (OH signal) is set correctly in any of Pr. 178 to Pr. 182 (input terminal function selection).
Corrective action
Reduce the load and frequency of operation.
Even if the relay contacts are reset automatically, the drive unit will not restart unless it is reset.
Operation panel
indication
E.PTC FR-PU07 PTC activated
Name
PTC thermistor operation
Description
Drive unit trips when resistance of PTC thermistor connected between terminal 2 and terminal 10 is more than the
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 point
Check the connection of the PTC thermistor.
Check the Pr. 561 PTC thermistor protection level setting.
Check the motor for operation under overload.
Corrective action Reduce the load weight.
Operation panel
indication
E.PE FR-PU07 Corrupt Memry
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.
Corrective action
Please contact your sales representative.
When performing parameter write frequently for communication purposes, set "1" in Pr. 342 to enable RAM write. Note
that powering OFF returns the drive unit to the status before RAM write.
