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 outdoor fan motor or humidifying fan motor>
Make sure that the voltage of 270 ± 30 V is applied.
1. Set operation OFF and power OFF. Remove the connector S70.
2. Check that the voltage between the pins 4-7 is 270 VDC.
3. Check that the control voltage between the pins 3-4 is 15 VDC.
4. Check that the rotation command voltage between the pins 2-4 is 5 VDC.
5. Keep operation OFF and power OFF. Connect the connector S70.
6. Check whether 2 pulses (0 - 15 V) are output at the pins 1-4 when the fan motor is rotated 1
Make sure that the voltage of 270 ± 30 V is applied.
1. Set operation OFF and power OFF. Remove the connector S72.
2. Check that the voltage between the pins 5-8 is 270 VDC.
3. Check that the control voltage between the pins 4-5 is 15 VDC.
4. Check that the rotation command voltage between the pins 3-5 is 5 VDC.
5. Keep operation OFF and power OFF. Connect the connector S72.
6. Check whether 2 pulses (0 - 15 V) are output at the pins 2-5 when the fan motor is rotated 1
Fuses are commonly used as follows. Refer to the corresponding wiring diagram.
177
Outdoor fan motor
turn by hand.
PCB
S70
1
2
3
4
5
6
7
Humidifying fan motor
turn by hand.
PCB
S70
1
2
3
4
5
6
7
8
SW power supply
FU1
Hygroscopic fan motor
Outdoor fan motor
FU2 Humidifying fan motor
Four way valve
When the FU2 is melted, check the outdoor fan motor for proper function.
Actual rotating pulse output (0-15V)
Rotation command pulse input (0-15V)
15V
DC270V
Actual rotating pulse output (0-15V)
Rotation command pulse input (0-15V)
15V
DC270V
SiBE12-908
(R10759)
(R10760)
Service Diagnosis