Available only for three-phase power input specification model.
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 to Pr. 192 "Output terminal function selection". (Refer to section 6.10.5).
1) Check for too high ambient temperature.
2) Check for heatsink clogging.
3) Check that the cooling fan is stopped. (Check that "FN" is not displayed on the operation
1) Set the ambient temperature to within the specifications.
2) Clean the heatsink.
3) Replace the cooling fan.
Input phase failure
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
It may function if phase-to-phase voltage of the three-phase power input becomes largely
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
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
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
E.OLT may not occur if stall prevention (OL) is activated during output phase loss.
Check the motor for use under overload. (Refer to section 6.3.5).
Reduce the load weight.
Check the Pr. 22 "Stall prevention operation level" setting.
Brake transistor alarm detection/internal circuit error
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.
Reduce the load inertia.
heck that the frequency of using the brake is proper.
Replace the inverter.
Causes and corrective actions
Input phase loss
Stall Prev STP ( OL shown during
stall prevention operation)
Br. Cct. Fault
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