Carrier 40MAQB12B--3 - AC Fan Motor Resistance Check; AC Fan Motor Winding Resistance Values

69
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
Normal resistance
value
Digital tester
Normal resistance
value
(+)Red (-)Black

(Several M)
(+)Red (-)Black

(Several M)
P
N U
N
U V
V W
W (+)Red
AC Fan Motor
Measure the resistance value of each winding by using the tester.
Position Resistance Value
RPG20B RPG28H
Black - Red
381±8% (68 _F) 342±8% (68 _F) 183.6±8% (68 _F) 180±8% (68 _F)
White - Black
267±8% (68 _F) 253±8% (68 _F) 206±8% (68 _F) 190±8% (68 _F)
Measure the resistance value of each winding by using the tester.
Position Resistance Value
Black--
Red
56±8%
(68
_F)
24.5±8%
(68
_F)
317±8%
(68
_F)
145±8%
(68
_F)
345±8%
(68
_F)
627±8%
(68
_F)
88.5±8%
(68
_F)
Red-
Yellow
76±8%
(68
_F)
19±8%
(68
_F)
252±8%
(68
_F)
88±8%
(68
_F)
150±8%
(68
_F)
374.3±8%
(68
_F)
138±8%
(68
_F)
Yellow-
Blue
76±8%
(68
_F)
19±8%
(68
_F)
252±8%
(68
_F)
88±8%
(68
_F)
150±8%
(68
_F)
374.3±8%
(68
_F)
138±8%
(68
_F)