Indoor Fan Motor Connector Output Check; Power Supply Waveforms Check - Daikin FFQ09Q2VJUFFQ12Q2VJUFFQ15Q2VJUFFQ18Q2VJURX09QMVJURX12QMVJURX15QMVJURX18QMVJU Service Manual

Check
5.2

Indoor Fan Motor Connector Output Check

Check No.02 1. Check the connection of connector.
2. Check motor power supply voltage output (pins 5 ~ 8).
3. Check motor control voltage (pins 5 ~ 4).
4. Check rotation command voltage output (pins 5 ~ 3).
5.3

Power Supply Waveforms Check

Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal block, and check the
waveform disturbance.
Fig.1
101
X20A
8
7
6
5
4
3
2
1
Check if the power supply waveform is a sine wave (Fig.1).
Check if there is waveform disturbance near the zero-cross (sections circled in Fig.2).
Motor power supply voltage (290 ~ 330 VDC)
Unused
Unused
GND
Motor control voltage (15 VDC)
Rotation command voltage (0 ~ 5 VDC)
Rotation pulse input
Unused
Fig.2
SiUS091628EA
(R24373)
Service Diagnosis