Panasonic CS-E18SD3UAW service manual - Page 84

H97 Outdoor Fan Motor - DC Motor Mechanism Locked

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15.5.13 H97 (Outdoor Fan Motor - DC Motor Mechanism Locked) Malfunction Decision Conditions  The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor. Malfunction Caused  Operation stops due to short circuit inside the fan motor winding.  Operation stops due to breaking of wire inside the fan motor.  Operation stops due to breaking of fan motor lead wires.  Operation stops due to Hall IC malfunction.  Operation error due to faulty outdoor unit PCB. Troubleshooting When abnormality indication starts again Turn off power supply and rotate fan by hand Does fan rotate smoothly? YES Turn power supply on and operate fan. Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. NO Replace fan motor Does it rotate? NO Turn off power supply and disconnect fan motor connector, then turn power on. YES Stop fan motor Check the rotation feedback output from fan motor. Check the output of fan motor from outdoor PCB Is the motor power supply voltage ~325Vdc (pin 7 & 4) generated? Rotate the fan motor by hand, is the rotation feedback NO voltage 15Vdc (1 & 4) generated? YES NO Is the motor control voltage 15Vdc (pin 3 & 4) generated? NO Operate the fan, is the rotation command voltage 1~5Vdc (pin 2 NO & 4) generated? YES Replace outdoor PCB Replace fan motor 84

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84
15.5.13
H97 (Outdoor Fan Motor – DC Motor Mechanism Locked)
Malfunction Decision Conditions
The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor.
Malfunction Caused
Operation stops due to short circuit inside the fan motor winding.
Operation stops due to breaking of wire inside the fan motor.
Operation stops due to breaking of fan motor lead wires.
Operation stops due to Hall IC malfunction.
Operation error due to faulty outdoor unit PCB.
Troubleshooting
When abnormality indication starts again
Turn off power supply and rotate fan by hand
Does fan rotate smoothly?
Turn power supply on and operate fan.
Does it rotate?
Turn off power supply and disconnect fan motor connector,
then turn power on.
Check the output of fan motor from outdoor PCB
Is the motor power supply voltage ~325Vdc (pin 7 & 4)
generated?
Is the motor control voltage 15Vdc (pin 3 & 4) generated?
Operate the fan, is the rotation command voltage 1~5Vdc (pin 2
& 4) generated?
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Stop fan motor
Check the rotation feedback output from fan motor.
Rotate the fan motor by hand, is the rotation feedback
voltage 15Vdc (1 & 4) generated?
YES
YES
YES
NO
NO
NO
NO
NO
YES
NO
Replace fan motor
Replace outdoor PCB
Replace fan motor
Caution