Hitachi RAS-(4-12)HNP(1)(E) - Abnormality of Fan Motor Protection (DC Fan Motor)

8 Troubleshooting
273
SMGB0087 rev.0 - 12/2013
8
Alarm code
57
Abnormality of fan motor protection (DC fan motor)
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
-1
during 30 seconds
and it stops. Regarding stops, when less than 35 seconds have passed since fan start up, after the rst 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 rst abnormality occurs, this alarm is indicated. The abnor-
mality occurs when the fan motor is stopped by slugging.
Does the motor run?
Yes
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)
Restart operation.
Connect it correctly
Restart
operation
Replace the fan motor and
the fuse
Replace the fan
motor
This is normal
Replace the PCB1
Replace inverter PCB
Does the fan stop
by the foreing matter?
This alarm is indicated due
to detected overcurrent by
the contrary wind. This is
normal.
No
Are the connectors
abnormal?
Faulty
Faulty
Alarm code is not indicated
Yes
Remove the foreing matter
No
Good
Check the fuses
EF1, EF2 and EF3
on PCB1, and EF1 on
inverter PCB
Good
Does the motor
run?
Yes
This is normal
No
Restart operation
Does the motor run?
No
Alarm code is not
indicated
Does thermal fuse
(R115 OR R116) on
inverter PCB blow
out?
Yes
No
Yes
N O T E
Check to ensure that DC Fan Motor is checked according to the item “8.4.7 Checking procedure for other parts”.