Ipm; Check Point 2 - Fujitsu Airstage VR-II Series Service Manual

SERVICE PARTS INFORMATION 7

IPM

(Mounted on Inverter PCB)
Check Point 1
Disconnect the connection wires between the Inverter
PCB - electrolytic capacitor and Inverter PCB - Inverter
Compressor.
Set the tester to the "Resistance" mode, and measure
the resistance between the following terminals.
Red wire (P) - screw terminals U/V/W
White wire (N) - screw terminals U/V/W
Judge the result of as follows:
All 6 points several M
1 or more points several k

Check Point 2

Set the tester to the "Diode" mode, and measure the voltage value between the following terminals.
Tester +side Tester - side
(red) (black)
Terminal U
Red wire
Terminal V
(P)
Terminal W
Terminal U
White wire
Terminal V
(N)
Terminal W
Judge the result of as follows:
All 6 points several 0.3V to 0.7V
1 or more points under 0.1V or over load : Defective
or greater : Normal
to short : Defective
Tester display
[V]
: Normal
Inverter PCB
N
P
04-101
W
U V