Turning Speed Pulse Input On The Outdoor Unit Pcb Check - Daikin Altherma EKHBH Series Service Manual

ESIE06-03
5.14

Turning Speed Pulse Input on the Outdoor Unit PCB Check

Check No.15 Propeller fan motor
Make sure the voltage of 320±30V 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 320 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
If the fuse for fan motor protection 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
Part 3 – Troubleshooting
1 and 4.
PCB
S70
1
2
3
4
5
6
7
Additional Checks for Troubleshooting
Turning speed pulse input (0-15 V)
15V
DC320V
1
3 3
4
5
3–63