Failure Code [879Emc] Ventilating Damper Abnormality - Komatsu PC200-8M0 Shop Manual

SEN06151-00

Failure code [879EMC] Ventilating Damper Abnormality

Action
Failure code
level
L01 879EMC
q
Air conditioner controller judged from potentiometer voltage of servomotor that vent (mode)
Detail of failure
changeover damper servomotor is not operating.
q
Action of con- The air conditioner controller sends information about the abnormality in vent (mode) changeover
troller damper to the machine monitor via CAN communication.
Problem on
q Vent (mode) cannot be changed but air conditioner can be operated.
machine
q
Method of reproducing failure code: Turn starting switch to ON position.
q
Check whether this failure code is displayed in the "Electrical Systems" (electrical systems abnor-
Related infor-
mality record) screen in the service mode of the machine monitor.
mation
q
Troubleshooting cannot be performed since the connector portion of vent (mode) changeover
damper servomotor cannot be checked while the air conditioner unit is installed on the machine.
Cause
1 Defective air conditioner controller
2 Defective air conditioner unit
54
80-100
Failure code [879EMC] Ventilating Damper Abnormality
Abnormality in vent (mode) changeover damper servomotor
Failure
(Machine monitor system)
Procedure, measuring location, criteria and remarks
If no failures are found by the above checks, the air conditioner controller may
be defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
If no failures are found by the above checks, the air conditioner unit may be
defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
100 Air conditioner
PC200, 200LC, 220, 220LC-8M0