Daikin FTXM-V Series, Service Manual

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Check SiUS042113E
140 Part 6 Service Diagnosis
2. On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
Otherwise, the terminals may be burned due to loosening.
5.8 Rotation Pulse Check on the Outdoor Unit PCB
Check No.16 Outdoor fan motor
 09/12 class
Check if the sinusoidal voltage is generated between pins 1 - 3 and 3 - 5 when the fan motor is
manually rotated once.
 18/24 class
Make sure that the voltage of 320 ± 30 V is applied.
1. Set operation OFF and power OFF. Disconnect the connector S70.
2. Check that the voltage between the pins 4 - 7 is 320 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 0 ~ 6.5 VDC.
5. Keep operation OFF and power OFF. Connect the connector S70.
6. Check whether 4 pulses (0 ~ 15 VDC) are output at the pins 1 - 4 when the fan motor is rotated
1 turn by hand.
When the fuse is melted, check the outdoor fan motor for proper function.
If NG in step 2

Defective PCB

Replace the outdoor unit PCB (main PCB).
If NG in step 4

Defective Hall IC

Replace the outdoor fan motor.
If OK in both steps 2 and 4

Replace the outdoor unit PCB (main PCB).
(R15292)
Direction of crimp
FASTON terminal
This size is shortened
by the crimp.
5
3
1 Phase U
Phase V
Phase W
S70
PCB