Trouble Diagnosis Of Fan Motor - Panasonic CU-5E34NBE-C Installationsanleitungen

8-5. Trouble Diagnosis of Fan Motor

This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil
resistance, and the following procedure should be used to check the motor.
Perform the trouble diagnosis by Test Run mode described on Installation Instructions of indoor unit.
Important: (A) Turn OFF the power before connecting or disconnecting the motor connectors.
[Trouble symptom 1] The fan does not stop when the outdoor unit stops.
[Trouble symptom 2] The fan motor does not rotate when the outdoor unit is operating.
(Diagnostic procedure)
* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the outdoor
unit controller (3 locations).
(1) Vm-Gnd : Between pin 1 and pin 3 of CN30
(2) Vcc-Gnd : Between pin 1 of CN31 and pin3 CN30
(3) Vs-Gnd : Between pin 3 of CN31 and pin3 CN30
(Diagnostic results)
All of the above measured values are normal.
Any one of the above measured values is not normal.
(Reference)
[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the outdoor
[Trouble symptom 4] Fan motor rotation speed does not change during outdoor unit operation.
[Trouble symptom 5] Fan motor rotation speed varies excessively during outdoor unit operation.
(Remedy for symptom 3 to 5)
It is not possible to identify whether the trouble is outdoor unit controller trouble or motor trouble.
Therefore, first replace the outdoor unit controller, then (if necessary) replace the DC motor.
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(B) When performing voltage measurement at the outdoor controller connector for (3) in the table
below, the DC motor will trip and voltage output will stop approximately 10 seconds after
operation is started. For this reason, to measure the voltage again, first turn OFF the outdoor
unit power, then, measure the voltage in Test Run mode.
Measurement location
DC motor connector pin arrangement
Connector No.
CN30
CN31
unit operates.
(There is trouble in the system that provides feedback of motor rotation speed from the
motor to the outdoor unit controller.)
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DC 280V +/- 10%
DC 15V +/- 10%
Fluctuation between DC 1.8V to 5.7V
Fan motor trouble (Replace the motor.)
Outdoor unit controller trouble
(Replace the controller .)
Pin
Pin 1: Vm (red)
Pin 2: Not used
Pin 3: Gnd (blue)
Pin 1: Vcc (brown)
Pin 2: PG (white)
Pin 3: Vsp (orange)
33
Outdoor unit controller trouble
Normal value