Daikin BSVQ36MVJU, Serivce Manual

Page: 226 / 273

SiUS39-601 Troubleshooting (OP: Unified ON/OFF Controller)
Troubleshooting 215
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 on?
(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 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?
Check No. 13 Power transistor check mode
When the inverter system malfunctions (malfunction of inverter, INV compressor), to locate where
the malfunction occurs, switching to the power transistor check mode of inverter in the service
mode setting enables not to judge the position detection signal malfunction but to output waveform
only during inverter operation. (The waveform can be checked by disconnecting the wiring of
compressor.)
After the completion of checks, return the system to the previous mode and wait for 30 seconds or
more until the discharge of capacitor is completed. Then, conduct a subsequent work.
Notes: Be sure to disconnect the compressor wiring when conducting the check operation mentioned
above.
When the output voltage is approx. 100~200 V (10 Hz) and the voltage balance between phases
U-V,V-W, W-U is within ±5%, the inverter PCB is normal.
* Voltage output will be different depend on measuring device.
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
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
GND
Vcc (approx. 15 V)
Position signal W
Position signal V
Position signal U
step 1 :
mode 2
code 28
set 01
→
02
step 2 :
mode 2
code 28
set 02
→
01
Magn.sw.
K1M on
Voltage
output
U-V-W
Magn.sw.
K1M off
Voltage
output
U-V-W
Frequency
= 10 Hz
–100
~200
VAC
–100
~200
VAC
–6 sec
–3 sec
–50 VAC
Frequency = 240 Hz
–30 sec