Checking The Fan Motor For Ground Fault And Coil Resistance Problems; Checking The Fan Board Error Detection Circuit At No Load; Checking The Fan Board For Damage At No Load - Mitsubishi Electric HP120TNU-A Service Handbook

[8-10 Troubleshooting Inverter Problems ]
8-10-6

Checking the Fan Motor for Ground Fault and Coil Resistance Problems

Items to be checked
Remove fan motor winding. Check
insulation resistance and coil resis-
tance.
8-10-7

Checking the Fan Board Error Detection Circuit at No Load

Items to be checked
(1) Stop the unit.
Turn off the breaker.
*Be sure to turn off the power.
(2) Disconnect the output wiring
to the fan motor.
Disconnect connector
RYFAN1. (On a model with
two fan motors, RYFAN1 cor-
responds to the right fan and
RYFAN2 corresponds to the
left fan (when seen from the
front).)
(3) Turn on the breaker.
(4) Operate the unit.
8-10-8

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. (On a model with
two fan motors, RYFAN1 cor-
responds to the right fan and
RYFAN2 corresponds to the
left fan (when seen from the
front).)
(3) Set SW7-2 on the control
board to ON. On a model with
two fan motors, set SW7-2
(left fan when seen from the
front) or SW7-4 (right fan
when seen from the front) to
ON.
(4) Turn on the breaker.
(5) Operate the unit
48
- chapter 8
Phenomena
1) Fan motor insulation failure.
If < 1 M , Defect.
2) Fan motor wire failure.
Target coil resistance: Approx. 10 .
(Changes with temperature)
Phenomena
1) An error other than current sensor er-
ror (5305, 5306: Detail code 135) is
detected during operation.
2) Current sensor fault
Error code: 5305, 5306
Detail code: 135
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.
Remedy
Change fan motor.
Change fan motor.
Remedy
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
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.
HWE18220_GB