Daikin VRV II RXYQ5MY1B Service Manual page 267

Troubleshooting (OP: Unified ON/OFF Controller)
Check No. 12 Check on pulse input of position signal of fan inverter PCB
(1) Disconnect the connector X2A while power supply OFF and operation OFF.
(2) Is the voltage between pins No. 4 and 5 on X2A approx. 15 V after power supply is turned
(3) Connect the connector X2A while power supply OFF and operation OFF.
(4) Check below conditions when the fan motor is rotated one turn manually under the condition
The condition (2) dose not appear → Faulty PCB → Replacing the PCB
The conditions (4) do not appear → Faulty hall IC → Replacing fan motor of outdoor unit
256
on?
of operation OFF after power supply is turned ON.
Are the pulse (approx. 0 V and 5 V) generated 4 times between No. 1 and 5 on X2A?
Are the pulse (approx. 0 V and 5 V) generated 4 times between No. 2 and 5 on X2A?
Are the pulse (approx. 0 V and 5 V) generated 4 times between No. 3 and 5 on X2A?
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
GND
Vcc (approx. 15 V)
Position signal W
Position signal V
Position signal U
SiE39-404
Troubleshooting