Carrier 38MBQ Series Service Manual page 35

IPM Continuity Check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure
the resistance between P and UVWN; UVW and N.
DIGITAL TESTER
(+)Red (-)Black
N
U
P
V
W
Table 28—IPM Continuity Check
NORMAL RESISTANCE VALUE
∞
(Several MΩ)
DIGITAL TESTER
(+)Red (-)Black
U
V
N
W
(+)Red
35
NORMAL RESISTANCE VALUE
∞
(Several MΩ)