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Check method of power board
Normal
Is the voltage of main incoming power
208/230V AC ?
*Check the breaker and power supply
Is the voltage to the compressor
(U-V,U-W and V-W) balanced ?
*To check the voltage of the parts on this board with a tester is difficult due to its location.
Test points are limited.
*Check wiring
*Check model setting switch SW4
on the multi controller board.
*Replace power board
Is the voltage of CNDC(PNK) on multi
board 280-350V DC?
*Check wiring
*Check power board
*Check noise filter board
Yes
Yes
Yes
No
No
No
Power board check
Multi controller board
Noise filter circuit board
208/230V ±10% AC
LI
NI
208/230V ±10% AC
3
-
1
CNDC
(PNK)
LO
NO
Power board
280-350V DC
208/230V ±10% AC
COMP
W
7654321
CN2
(WHT)
U-V 10V-180V AC
U-W 10V-180V AC
V-W 10V-180V AC
conv.
circuit
*See test point
52C
P36NHMU
P48NHMU
2
W
W
W
V
U
Circuit diagram
L1
L2
TB1