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[8-9 Troubleshooting Inverter Problems ]
8-9-9
Checking the Fan Board for Damage at No Load
Items to be checked
(1)
Stop the unit.
Turn off the breaker.
*Be sure to turn off the power.
(2)
To allow for the disconnection
of output wiring from the fan
motor, disconnect connector
RYFAN1.
(3)
Set SW7-2 on the control
board to ON.
(4)
Turn on the breaker.
(5)
Operate the unit
8-9-10
Checking the Fan Board for Damage with Load
Items to be checked
(1)
Turn off breaker.
(2)
Turn on breaker.
(3)
Operate unit.
32
- chapter 8
Phenomena
1)
An error other than the current sen-
sor error (5305, 5306 Detail code
135) is detected within 30 seconds
from the startup of operation.
2)
Inter-wire voltage imbalance of 5 V or
above
3)
No inter-wire voltage imbalance ex-
ists. A current sensor error (Detail
code 135) is detected 30 seconds af-
ter the startup of operation, and the
operation stops.
Phenomena
1)
The operation stops within 20 seconds
of startup and a step-out error or an
overcurrent error occurs.
Check code: 4255, 4256
Detail code: 101, 106, 107, 137
2)
Motor synchronization loss or electrical
current overload during operation
Check code: 4255, 4256
Detail code: 101, 106, 107, 137
3)
Sensor error during operation
Check code: 5305, 5306
Detail code: 135, 136
4)
Voltage overload error
Check code: 4225, 4226
Detail code: 109
5)
Load short circuit
Check code: 4255, 4256.
Detail code: 105
6)
After RPM has stabilized, voltage unbal-
ance of 5%, or 5V.
Remedy
Replace the fan board.
Replace the fan board.
Normal
*When done checking, reconnect all
connectors as they were. Unless
they are properly reconnected, cur-
rent sensor fault will not be resolved.
Remedy
Check for fan motor lock.
→If locked, change for fan motor.
If the same error is still present
after changing fan motor, change
Fan board.
→If not locked, refer to 3) & 4).
a. Check for gusts or windy conditions.
b. Go to [8-9-8 Checking the Fan
Board Error Detection Circuit at No
Load]if not windy.
c. After checking [8-9-9 Checking the
Fan Board for Damage at No
Load], and there is no problem,
change Fan board.
d. If replacing Fan board doesn't re-
solve issue, change fan motor.
a. Check for disconnection of fan in-
verter output wiring and for broken
wiring.
b. If the error is not associated with any
of the items above, replace the fan
board.
c. Change fan motor if Fan board
change doesn't resolve issue.
a. Check for gusts or windy conditions.
b. Change Fan board if it is not windy.
a. Check [8-9-7 Checking the Fan Mo-
tor for Ground Fault and Coil Resis-
tance Problems] and [8-9-8
Checking the Fan Board Error De-
tection Circuit at No Load]. If no
problem, then check wiring forshort
circuit.
b. If there is no problem with item a.
above, change fan motor.
c. If same error after motor change,
change Fan board.
a. If voltage is unbalanced, go to [8-9-
8 Checking the Fan Board Error
Detection Circuit at No Load]
b. After checking [8-9-9 Checking the
Fan Board for Damage at No
Load], and there is no problem,
change Fan board.
c. If replacing Fan board doesn't re-
solve issue, change fan motor.
BS_08_C
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