Daikin VRV III RXYQ5-54PY1 Service Manual page 322

Si34-601A
Check No. 1 Check on connector of fan motor (Power supply cable)
(1) Turn off the power supply.
Check No. 2 (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.
Furthermore, to use a multiple meter for measurement, connect the probe of negative pole
to Vcc and that of positive pole to GND.
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
Troubleshooting (OP: Unified ON/OFF Controller)
U
Measure the resistance
V
values between phases
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
311