Ipm Protection - Fujitsu ASU9RLQ Service Instructions Manual

IPM Protection

[Checking Points]
Check the following points and locae the cause in the outdoor unit.
[Cause]
•@ (1) Compressor failure
•@ (2) Refrigeration cycle failure
•@ (3) PC Board defective
•@ (4) IPM defective
•@ (5) Incorrect wiring
[First step]
Measure the DC voltage at terminals (between Electrolytic Capacitor and discharge resistance)
in the Inverter Controller Assy, and make sure it is lower than DC5V.
If it is higher than 5V, wait until the discharging is over.
Check point (1)
Open the Inverter Controller Assy
and check if there is abnormal points.
Go to Check point (2)
Check point (2)
Turn on the power and press TEST button
on Remote Control.
Is the outdoor fan rotating?
Go to Check point (3)
Check point (3)
Operate the unit for certain time and
check if the compressor is operating.
The unit is normal.
Recheck
Operate the unit for certain time and
check if the compressor is operating.
No(Abnormal)
Yes(Normal)
Yes(Rotating)
Yes(Operating)
Yes(Operating)
No(Not operating) > Return to the start
Incorrect wiring > Correct and recheck
Parts touched > Correct and recheck
Parts broken
No(Not rotating)
IPM or PCB defective > Replace PCB
No(Not operating)
IPM or PCB defective > Replace PCB
> Check completed
07-08
> Change the broken part