Mitsubishi Electric FR-D720S SC EC, Instruction Manual

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Causes and corrective actions Troubleshooting
7 - 12
Available only for three-phase power input specification model.
Operation Panel
Indication
E.FIN
FR-PU04
FR-PU07
H/Sink O/Temp
Name Fin overheat
Description
If the heatsink overheats, the temperature sensor is actuated to stop the inverter output.
The FIN signal can be output when the temperature becomes approximately 85% of the
heatsink overheat protection operation temperature. For the terminal used for the FIN sig-
nal output, assign the function by setting "26" (source logic) or "126" (sink logic) in any of
Pr. 190, Pr. 192 or Pr. 197 "Output terminal function selection". (Refer to section 6.9.5).
Check point
Check for too high ambient temperature.
Check for heatsink clogging.
Check that the cooling fan is stopped. (Check that "FN" is not displayed on the operation
panel.)
Corrective action
Set the ambient temperature to within the specifications.
Clean the heatsink.
Replace the cooling fan.
Operation Panel
Indication
E.ILF
FR-PU04 Fault 14
FR-PU07 Input phase loss
Name
Input phase loss
Description
Inverter trips when function valid setting (=1) is selected in Pr. 872 Input phase loss protec-
tion selection and one phase of the three phase power input is lost. (Refer to section
6.12.2).
It may function if phase-to-phase voltage of the three-phase power input becomes largely
unbalanced.
Check point
Check for a brake in the cable for the three-phase power supply input.
Check that phase-to-phase voltage of the three-phase power input is not largely
unbalanced.
Corrective action
Wire the cables properly.
Repair a brake portion in the cable.
Check the Pr. 872 "Input phase failure protection selection" setting.
Set Pr. 872 = "0" (without input phase loss protection) when three-phase input voltage is
largely unbalanced.
Operation Panel
Indication
E.OLT
FR-PU04
FR-PU07
Stall Prev STP ( OL shown during
stall prevention operation)
Name Stall prevention
Description
If the output frequency has fallen to 1Hz by stall prevention operation and remains for 3s, a
fault (E.OLT) appears and trips the inverter. "OL" appears while stall prevention is being
activated.
E.OLT may not occur if stall prevention (OL) is activated during output phase loss.
Check point Check the motor for use under overload. (Refer to section 6.2.4).
Corrective action
Reduce the load weight.
Check the Pr. 22 "Stall prevention operation level" setting.