Daikin 2MKS40DVMB, Service Manual

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Check SiBE12-519
178 Service Diagnosis
5.1.12 Turning Speed Pulse Input on the Outdoor Unit PCB Check
Check No.15 <Propeller fan motor>
Make sure the voltage of 290~380V is being applied.
(1) Stop the operation first and then the power off, and disconnect the connector S70.
(2) Make sure there is about DC 280 V between pins 4 and 7.
(3) With the system and the power still off, reconnect the connector S70.
(4) Make a turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice at
pins 1 and 4.
If the fuse is blown out, the outdoor-unit fan may also be in trouble. Check the fan too.
If the voltage in Step (2) is not applied, it means the PCB is defective. Replace the PCB.
If the pulse in Step (4) is not available, it means the Hall IC is defective. Replace the DC fan
motor.
If there are both the voltage (2) and the pulse (4), replace the PCB.
∗
Propeller fan motor : S70
5.1.13 Hall IC Check
Check No.16 1. Check the connector connection.
2. With the power ON, operation OFF, and the connector connected, check the following.
∗
Output voltage of about 5 V between pins 1 and 3.
∗
Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
Failure of (1)
Æ
faulty PCB
Æ
Replace the PCB.
Failure of (2)
Æ
faulty Hall IC
Æ
Replace the fan motor.
Both (1) and (2) result
Æ
Replace the PCB.
7
6
5
4
3
2
1
Turning speed control voltage (DC~6.5V)
Turning speed pulse input
Fan motor power supply voltage (310~340V)
P.0V (reference of electric potential)
Fan motor control voltage (DC15V)
(R3052)
PCB
S70