Abnormality Of Fan Motor Protection (Dc Fan Motor) - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
57
Alarm code
For RAS-(2-2.5)HVNP1 and RAS-3HVNC1
- This alarm is indicated when the revolution pulse output from the fan motor is lower than 20min
and it stops. Regarding stops, when less than 35 seconds have passed since fan start up, after the first abnormality
is detected, if its occurs 4 times more within 5 minutes, it stops and alarm is displayed.
For RAS-(3-6)H(V)NP1E and RAS-(8-12)HN(P/C)(E)
- This alarm is indicated when the revolution pulse output from the fan motor is 10 rpm or less and the reverse
revolution signal is detected. The fan motor is stopped once, and restarted after 10 seconds.
If it occurs more than 10 times in 5 minutes after the first abnormality occurs, this alarm is indicated. The abnor-
mality occurs when the fan motor is stopped by slugging.
Restart operation.
Does the motor run?
Does the fan stop
by the foreing matter?
Check the connectors CN14 and CN15 on PCB1 and
CN203, CN204, CN201, CN202, PCN201 and PCN202
on inverter PCB. Replace inverter PCB in the case that
fan motor does not run even if O.U. PCB is replaced.
CN24 on PCB1 (RAS-(2-2.5)HVNP1 and RAS-3HVNC1)
Are the connectors
abnormal?
Check the fuses
EF1, EF2 and EF3
on PCB1, and EF1 on
inverter PCB
Faulty
Replace the fan motor and
the fuse
Restart operation
Does the motor run?
No
Alarm code is not
indicated
N O T E
Check to ensure that DC Fan Motor is checked according to the item
273
SMGB0087 rev.0 - 12/2013

Abnormality of fan motor protection (DC fan motor)

Yes
No
Alarm code is not indicated
Yes
No
Faulty
Good
Good
Yes
Does thermal fuse
(R115 OR R116) on
inverter PCB blow
This alarm is indicated due
to detected overcurrent by
the contrary wind. This is
Remove the foreing matter
Connect it correctly
Restart
operation
Yes
Does the motor
run?
No
Replace the fan
motor
No
Replace the PCB1
out?
Yes
Replace inverter PCB
"8.4.7 Checking procedure for other
during 30 seconds
-1
normal.
This is normal
This is normal
parts".
8