Troubleshooting Outdoor Unit Fan Problems - Mitsubishi Electric PURY-HP72 Service Handbook

[8-7 Troubleshooting Outdoor Unit Fan Problems ]

8-7

Troubleshooting Outdoor Unit Fan Problems

(1) Fan motor (common items)
To check the revolution of the fan, check the inverter output state on the self-diagnosis LED, as the inverter on the outdoor
fan controls the revolutions of the fan.The revolution of the fan is approximately 680 rpm (HP72 model), 790 rpm (HP96 model)
at full speed.
When starting the fan, the fan runs at full speed for 5 seconds.
When setting the DIP SW4 (when SW6-10 is set to OFF) as shown in the figure below, the inverter output [%] will appear.
100% indicates the full speed and 0% indicates the stopping.
For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325)
As the revolution of the fan changes under control, at the interphase or when the indoor unit operation capacity is low, the
revolution of the fan may change.
If the fan does not move or it vibrates, Fan board problem or fan motor problem is suspected. When checking the fan motor
for problems by shutting down the power, be sure to disconnect the motor wire from the fan board. If a short-circuited fan board
malfunctions, it will keep the fan motor from rotating smoothly. For details, refer to the following page(s).
(TKMU)
[8-10-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 291)
[8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 291)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 292)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 293)
(YKMU)
[8-11-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 301)
[8-11-7 Checking the Fan Board Error Detection Circuit at No Load](page 301)
[8-11-8 Checking the Fan Inverter for Damage at No Load](page 302)
[8-11-9 Checking the Fan Inverter for Damage with Load](page 303)
HWE13080
Fan
SW4
1 2 3 4 5 6 7 8 9 10
ON
- 272 -
GB