Carrier 38MGRBQ18B-3 Service Manual page 75

38MGRBQ: Service Manual
2. Compressor Check
Measure the resistance value of each winding by using the tester.
Position
ATM150D23UFZ
Blue - Red
Blue - Black 1.72 Ω
Red - Blue
3. 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
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 48 — Compressor Check
Table 31 — Compressor Check
ATF235D22UMT ATF250D22UMT
0.75 Ω 0.75 Ω
Table 32 — IPM Continuity Check
Normal resistance value
∞
(Several MΩ)
RESISTANCE VALUE
ATF310D43UMT ATQ360D1UMU
0.65 Ω 0.37 Ω
126
Digital tester
(+)Red
U
V
W
(+)Red
75
ATQ420D1UMU EAPQ420D1UMUA
0.38Ω
Normal resistance value
(-)Black
∞
N
(Several MΩ)
0.1Ω