Failure Code [Dd1Nl4] Fan Automatic Reverse Switch Signal: Abnormality - Komatsu WA250-6 Shop Manual

SEN03845-00

Failure code [DD1NL4] Fan automatic reverse switch signal: Abnormality

Action code Failure code
E01 DD1NL4
Contents of
• Because of hot short in fan automatic reverse switch system, fan automatic reverse switch input and
trouble
fan manual reverse switch input were sensed simultaneously.
Action of
• Turns automatic reverse switch function OFF.
controller
Problem that
• After error is detected, fan does not reverse.
appears on
• Automatic reverse switch LED lamp keeps lighting.
machine
• Input state from fan automatic reverse switch can be checked with monitoring function
Related
(Code: HST – 93400 – FAN REVERSE SW) (Code: MONITOR PANEL – 40901 – D-IN-9).
information
• Method of reproducing failure code: Turn starting switch ON.
Defective fan automatic
1 reverse switch (Internal short
circuit)
Possible causes
and standard
Hot short in wiring harness
value in normal
2
(Contact with 24V circuit)
state
3 Defective machine monitor
8
40-350
Failure code [DD1NL4] Fan automatic reverse switch signal: Abnormality
Fan automatic reverse switch signal: Abnormality
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (3), (4) – (5)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
(Carry out troubleshooting with automatic reverse switch OFF)
Wiring harness between L25 (female) (14) –
L69 (female) (3), (4) and ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between (14) and
350 Troubleshooting by failure code (Display of code), Part 5
Standard value in normal state/Remarks on troubleshooting
Fan automatic reverse
L69 (male)
Fan automatic reverse
L25 (male)
ground
Resistance
switch
ON Max. 1 z
OFF Min. 1 Mz
Voltage
Voltage
switch
ON 20 – 30 V
OFF Max. 1 V
WA250, 250PZ-6
Max. 1 V