Mitsubishi Electric FR-F700PJ Series, Instruction Manual

Page: 310 / 356

305
5
TR
O
U
BLE
S
HOOTING
Causes and corrective actions
Operation panel
indication
E.BE
FR-PU04
FR-PU07
Br. Cct. Fault
Name Brake transistor alarm detection
Description
When a brake transistor alarm has occurred due to the large regenerative energy from the motor etc., the brake
transistor alarm is detected and the inverter trips.
In this case, the inverter must be powered OFF immediately.
Check point

Reduce the load inertia.

Check that the frequency of using the brake is appropriate.
 Check that the brake resistor selected is correct.
Corrective action Replace the inverter.
Operation panel
indication
E.GF
FR-PU04
FR-PU07
Ground Fault
Name Output side earth (ground) fault overcurrent at start
Description
The inverter trips if an earth (ground) fault overcurrent flows at start due to an earth (ground) fault that occurred on
the inverter's output side (load side). Whether this protective function is used or not is set with
Pr. 249 Earth (ground)
fault detection at start . When the setting of Pr. 249 Earth (ground) fault detection at start is the initial value (Pr. 249 ="0") ,
this warning does not occur.
Check point Check for a ground fault in the motor and connection cable.
Corrective action
Remedy the ground fault portion.
Operation panel
indication
E.LF
FR-PU04
FR-PU07
E.LF
Name
Output phase loss
Description
If one of the three phases (U, V, W) on the inverter's output side (load side) is lost during inverter operation (except
during DC injection brake operation and when output frequency is under 1Hz), inverter stops the output. 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 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. (IPM motor control)
Corrective action
 Wire the cables properly.

Choose inverter and motor capacities that match.
 Input a start command after the motor stops. Alternatively, use automatic restart after instantaneous power
failure/flying start function.
(IPM motor control)
(Refer to page 161
,
166)
Operation panel
indication
E.OHT
FR-PU04
FR-PU07
OH Fault
Name External thermal relay operation

Description
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. 182 (input terminal function selection) .
This protective function is not available in the initial status (OH signal is not assigned).
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 inverter will not restart unless it is reset.
Operation panel
indication
E.PTC
FR-PU04 Fault 14
FR-PU07 PTC activated
Name
PTC thermistor operation
Description
Inverter 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 is not available 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.