Failure Code [Dd1Nld] Fan Reverse Switch Signal: Abnormality - Komatsu WA250-6 Shop Manual

SEN03845-00

Failure code [DD1NLD] Fan reverse switch signal: Abnormality

Action code Failure code
E01 DD1NLD
Contents of
• Since the fan manual reverse switch system is shorted with the power source, the fan manual
trouble
reverse switch remains at ON position. (Continuation for 30 seconds determines fault)
Action of
• None in particular.
controller
Problem that
appears on
• Fan remains in the reverse rotation
machine
• The input state (ON/OFF) from the fan manual reverse switch can be checked with the monitoring function
Related (Code: HST – 93400 – FAN REVERSE SW).
information (Code: MONITOR PANEL – 40900 – D-IN-1).
• Method of reproducing failure code: Turn the starting switch ON.
Defective fan reverse switch
1
(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
10
40-350
Fan reverse switch signal: Abnormality
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between L25 (female) (10) –
L69 (female) (1), (6) and ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between (10) and
350 Troubleshooting by failure code (Display of code), Part 5
Failure code [DD1NLD] Fan reverse switch signal: Abnormality
Standard value in normal state/Remarks on troubleshooting
Fan manual reverse
L69 (male)
Between
(5) – (1), (16)
Fan manual 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