Hitachi RAS-(2-6)HVNP1(E), Service Manual

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8 Troubleshooting
310
SMGB0087 rev.0 - 12/2013
8.4.4 Checking procedeure for the DC fan motor
When ISPM/DIP-IPM is faulty and Alarm 03, 04 or 53 appears, the fan motor may also be damaged. To prevent ISPM/DIP-
IPM damage which may result from operation combined with a faulty fan motor, check also if the fan motor is not damaged
when ISPM/DIP-IPM is replaced
C A U T I O N
• Turn OFF main power before start working.
• Working and checking with the power ON may disturb correct diagnosis and may result in failure.
Models with DC motor(s) Number of motors
RAS-(2-2.5)HVNP1
RAS-3HVNC1
RAS-3HVNP1E
RAS-(4-6)H(V)NC1E
1 Piece
RAS-12HN(P/C) 1 Piece (upper)
RAS-(4-6)H(V)NP1E
RAS-(8-10)HN(P/C)E
2 Pieces
Procedure in case of error diagnosis
1 Remove fan motor connectors for DC fan motor from the control PCB, ISPM or DIP-IPM and turn the fan motor shaft
by hand.
Normal Fan motor shaft turns smoothly
Normal
The 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:
Measurement procedure
Remove the fan motor connector from the control PCB, ISPM or DIP-IPM.
Connect the black test lead of the tester to the black wire pin of the fan motor connector.
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
Obbserved 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.
Model Motor model
Wire color for checking (Normal value)
Red-black White-black Yellow-black Blue-black
RAS-(2-2.5)HVNP1
RAS-3HVN1C
FPD10U40S-902 1MΩ or greater 1MΩ or greater
RAS-(3-6)H(V)NP1E (both) SIC-61FW-D858 1MΩ or greater 1MΩ or greater
RAS-(4-6)H(V)NC1E EQDW04AHT ∞ ∞
RAS-(8-10)HN(P/C)E (both)
RAS-12HN(P/C)
SIC-81FW-8183 1MΩ or greater 1MΩ or greater
N O T E
Values are shown for referential purpose. While actual values may vary depending on the type of the tester, any tester can
be used to determine any short-circuit or breakage based on ∞ or several Ω or 0 Ω or ∞.