Daikin VRV II RXYQ5MY1B Service Manual page 266

SiE39-404
Check No. 8 Check on connector of fan motor (Power supply cable)
(1) Turn off the power supply.
Check No. 9 (1) Turn off the power supply.
(2) Measure the resistance between Vcc and each phase of U,V,W, and GND and each phase
Troubleshooting
Measure the resistance between phases of U,V,W at the motor side connectors (three-core
wire) to check that the values are balanced and there is no short circuiting, while connector
or relay connector is disconnected.
Red
White
Black
at the motor side connectors (five-core wire) to check that the values are balanced within the
range of ± 20 %, while connector or relay connector is disconnected.
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
Troubleshooting (OP: Unified ON/OFF Controller)
U
Measure the resistance
values between phases
V
U,V,W.
W
GND
Vcc
Measure the resistance
values between Vcc
W
and U,V,W, and GND
and U,V,W.
V
U
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