d. By touching the + side of the tester to the - terminal of diode
module and the - side of tester to the ~ terminals (3 NOs.) of the
diode module, measure the resistance.
If all the resistances are greater than 500kΩ, it is normal.
• Fault diagnosis procedure
Fault diagnosis of DC fan motor. About fan motor fault diagnosis:
When ISPM/DIP-IPM is faulty and Alarm 53 appears, the fan motor may also be damaged. After replacing the new
ISPM/DIP-IPM, ISPM/DIP-IPM will be damaged again if it operates with a damaged fan motor. Check also if the fan
motor is not damaged when IPM/DIP-IPM is replaced.
C A U T I O N
– Turn OFF main power before start working.
– Working/checking with the power ON may disturb correct diagnosis and may result in failure.
Models for IVX:
DC motor(s) included in different models:
Model
Pieces
RAS-3HVRNME 1
RAS-(4-6)HVRNM1E 2
RAS-(4-6)HRNM1E 2
RAS-(8-12)HRNM 1 (Upper Motor)
1 Remove fan motor connectors from the control PCB ISPM or DIP-IPM and turn the fan motor shaft by hand.
Normal:
Fan motor shaft turns smoothly.
Faulty: No continuous rotary torque movement felt when turning the motor by hand. This occurs because the internal magnet
of the fan motor breaks the movement when the internal electronic circuit of the fan motor has a short-circuit fault.
2 Measure the fan motor resistance using a tester.
Measurement procedure:
1. Remove the fan motor connector from the control PCB, ISPM or DIP-IPM.
2. Connect the black test lead of the tester to the black wire pin of the fan motor connector
3. Connect the red test lead to the wire connector pin to be checked
Results
Normal: Observed values will be close to the normal values in the table below
Faulty: Observed values will be deviated from the normal values in the table below.
(Generally an open-circuit fault shows ∞, and a short-circuit fault shows several Ω-kΩ.)
Internal electronic circuit fault of the fan motor including short-circuit and breakage can be checked
8 Troubleshooting
307
SMGB0060 rev. 1- 12/2010
8
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