Daikin Sensira Series Service Manual page 98

2 | Components
Service manual
98
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
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.
Comm
4
4
4
4
Action
Continue with the next step.
Replace the DC fan motor, see
procedures" [
Action
Continue with the next step.
Perform a check of the inverter PCB,
see "2.7.1 Checking
Action
Perform a check of the inverter PCB, see
"2.7.1 Checking
Continue with the next step.
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Resistance
>1 MΩ
>100 kΩ
>100 Ω
>100 kΩ
"Repair
4
99].
4
procedures" [ 72].
4
procedures" [ 72].
Split Sensira R32
ESIE18-12E – 2021.02