Daikin SkyAir RZQ200 · 250C7Y1B Service Manual page 184

SiBE26-701
Check No. 1 Check on connector of fan motor (Power supply cable)
(1) Turn off the power supply.
Check on connector of fan motor (Signal line)
(1) Turn off the power supply.
(2) Measure the resistance between Vcc and each phase of U,V,W, and GND and each phase
Check No. 2 Check on pulse input of position signal of fan inverter PC board
(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 PC board → Replacing the PC board
The conditions (4) do not appear → Faulty hall IC → Replacing fan motor of outdoor unit
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
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?
U
Measure the resistance
V
values between phases
U,V,W.
W
GND
Vcc
W
V
U
5 Gray GND
4 Pink Vcc (approx. 15 V)
3 Orange Position signal W
2 Blue Position signal V
1 Yellow Position signal U
Diagnosis by Remote Controller
Measure the resistance
values between Vcc
and U,V,W, and GND
and U,V,W.
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