Daikin RXTA30B2V1B Service Manual page 137

RXTM-R+RXTP-R+ARXTP-R+RXTA-B+FTXTA30B2V1B(W)
(B)+FTXTM30+40R2V1B+FTXTP25+35M5V1B+ATXTP25+35M5V1B
R32 Optimized Heating 4 Split
ESIE21-12A – 2022.02
8 Disconnect the DC fan motor connector S70 and measure the resistance on
the connector pins shown below. The measured resistance MUST be:
VDC
1
2
3
7
INFORMATION
The measured resistance values may deviate from the listed values due to instability
during the measurements.
DC fan motor resistance measurements
are correct?
Yes
No
9 Turn ON the power of the unit.
10 With the DC fan motor connector S70 disconnected from the inverter PCB,
measure the voltage on the connector pins 4-7 (= fan motor power supply) on
the inverter PCB.
Result: The voltage MUST be 200~390 V DC.
11 Measure the voltage on the connector pins 4-3 (= fan motor control) on the
inverter PCB.
Result: The voltage MUST be 15±10% V DC.
Are both measured voltages correct?
Yes
No
12 Measure the voltage on the DC fan motor connector S70 pins 2-4 (= rotation
command) on the PCB.
Result: The measured voltage should be 0~7 V DC. It should NOT be 0 V DC.
Is the measured voltage 0 V DC?
Yes
No
13 Connect the DC fan motor connector to the PCB. Remove the plastic insert
from the connector for easier measurement.
CAUTION
Ensure that the system CANNOT start the fan. Disable all modes (heating, cooling, ...)
on the unit. The unit MUST be kept powered.
14 Manually (slowly) rotate the fan blade propeller 1 turn and measure the
voltage on the DC fan motor connector pins 1-4.
Result: 4 pulses MUST be measured.
Comm
4
4
4
4
Action
Continue with the next step.
Replace the DC fan motor, see
"4.15.2 Repair
Action
Continue with the next step.
Perform a check of the main PCB, see
"4.14.1 Checking
Action
Perform a check of the main PCB, see
"4.14.1 Checking
Continue with the next step.
4 Components
|
Resistance
>1 MΩ
>100 kΩ
>100 Ω
>100 kΩ
4
procedures" [ 138].
4
procedures" [ 126].
4
procedures" [ 126].
Service manual
137