Specifications
Troubleshooting (OP: Unified ON/OFF Controller) SiUS39-601
214 Troubleshooting
Check No. 8 Check on connector of fan motor (Power supply cable)
(1) Turn off the power supply.
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.
Check No. 9 Check on connector of fan motor (Signal wire)
(1) Turn off the power supply.
(2) Measure the resistance between Vcc and each phase of U,V,W, and GND and each phase 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.
Red
White
Black
U
V
W
Measure the resistance
values between phases
U,V,W.
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
GND
Vcc
W
V
U
Measure the resistance
values between Vcc
and U,V,W, and GND
and U,V,W.