Rotating Pulse Input On Outdoor Unit Pcb Check - Daikin CTXU25G2V1B Service Manual

Check
3.12

Rotating Pulse Input on Outdoor Unit PCB Check

Check No.23 < For propeller fan motor or humidification fan>
Make sure voltage of 270 ± 30 V is applied.
1. Set power ON and operation OFF. Remove connector S70 or S72.
2. Check that the voltage between No. 4 pin and No.7 pin is 270 VDC.
3. Check that the control voltage between No. 3 pin and No. 4 pin is 15 VDC.
4. Check that the RPM command voltage between No. 2 pin and No. 4 pin is 5 VDC.
5. Set power OFF and operation OFF. Connect connector S70 or S72.
6. Check whether two pulses (0 - 15 V) are input at No. 1 pin and No. 4 pin when the fan motor
When FU2 is melted, check outdoor fan for proper function.
<For Hygroscopic fan>
Check that the connectors HK1, HK2, HK3 for proper connection.
1. Check that the supply voltage between HK1 and HK3 is 5VDC.
2. If NG in step 1 → Defective PCB → Replace the PCB.
Therefore, when the FU2 is melted, check rotor motor for proper function.
170
is rotated 1 turn by hand.
Fuses are commonly used as follows. Refer to the corresponding circuit diagram.
SW power supply
FU1 Four way valve
Hygroscopic fan
Outdoor fan
FU2
Humidification fan
If NG in step 2 → Defective PCB
If NG in step 4 → Defective Hall IC → Replace the DC fan motor.
If OK in both steps 2 and 4 → Replace the PCB.
PCB
S70 or S72
1
2
3
4
5
6
7
Propeller fan motor: S70, Humidification fan motor: S72
*Check when the machine is not in suspend mode.
SW power supply
FU1 Four way valve
Hygroscopic fan
Outdoor fan
FU2
Humidification fan
→
Replace the PCB.
RPM command pulse input (0-15V)
15V
DC270V
SiBE12-908
(R3477)
Service Diagnosis