Electrical System, Part - Komatsu WA250-6 Shop Manual

910 Electrical system, Part 1

Machine monitor
List of items displayed on monitor
Condition for judging that the engine is running:
If 2 or more are met in the following 3 conditions, the engine is judged running when the abnormality in the
CAN communication occurs and the charge level exceeds the specified level.
1. Turning "ON" of the starting switch is recorded (IGN-C signal was entered)
2. Charge level exceeds the specified value (the voltage reached 12 V once and remains 5 V or above after
that)
3. Engine speed is 500 rpm or above
Lamp Lamp period
Q: ON
Period: 1,600 msec.
w: Flashing ON: 800 msec.
OFF: 800 msec. (duty 50%)
Period: 240 msec.
A: Intermittent
ON: 80 msec.
OFF: 160 msec.
E: Separately
set conditions
Category No. Item
Central
Central
warning 11
warning
lamp
Back light — Back light
1 HST oil
2 temperature
Gauges and
meters
Engine
3
coolant
4
temperature
Engine speed
5
Travel speed
Gauges and 9
Fuel level
meters 10
WA250, 250PZ-6
Alarm buzzer
w: Intermittent
—
sounds
A: Intermittent
sounds
E: Canceling
sounds
e: Completion
—
sounds
Device Operating condition
When error occurs
LED
For other than above, see
"Operating condition,
central warning lamp" of
other items.
When lamp switch is other
LED
than "OFF"
Other than below
Pointer:
Movement
Alarm: 105°C or above
Caution
lamp: LED
When abnormality is
detected (out of input
signal range)
Other than below
Alarm: 102°C or above
Pointer:
Movement Alarm: 105°C or above
Caution
When abnormality is
lamp: LED
detected (high
temperature)
When abnormality is
detected (low
temperature)
When engine speed
display is selected
Pointer:
Movement
When travel speed display
is selected
Other than below
Pointer:
Min. 62 z
Movement
When abnormality is
Caution
detected (input voltage is 4
lamp: LED
V or above and no
incoming IGN-C signal is
detected)
Operating condition
Warning for dangerous
condition (error or caution
message is generated)
Caution for erroneous
operation (when an irregular
operation is done)
Set cancellation such as
calibration (inoperative state)
Completion of setting such
as calibration (when normally
ended)
Detecting
Operating condition
time
Engine stopped
(sec)
E E E E E E E
— — — — — —
— — — — — —
— — — — — —
10 1 w Q Q B@CRNS w Q
20 5 — — — DGH1KX — — — DGH1KX
— — — — — —
3 0 — Q — — Q —
w Q Q B@BCNS w Q
— — — CA144 — — —
— — — CA145 — — —
— — — — — —
— — — — — —
— — — — — —
10 1 — Q — — Q —
10 2 — — — DJF1KA — — —
SEN03833-01
Buzzer period
Period: 1,600 msec.
ON: 800 msec.
OFF: 800 msec. (duty 50%)
Period: 240 msec.
ON: 80 msec.
OFF: 160 msec.
ON: 1,000 msec. (1 time)
ON: 100 msec.
OFF: 160 msec.
ON: 100 msec. (1 time)
Engine is running
Remarks
Turned ON with errors (E03
and E02) of each controller,
E simultaneously displaying
the message on the
character display.
White range: 30 – 105°C
Red range: 105 – 135°C
When the sensor is
Q B@CRNS
disconnected or hot short-
circuited: Max
When sensor was
disconnected or hot short-
circuited: Min
White range: 50 – 102°C
Red range: 102 – 135°C
Q B@BCNS When the sensor is
disconnected or hot short-
circuited: Max
When sensor was
CA144
disconnected or hot short-
circuited: Min
CA145
(selectable with the machine
monitor setting)
—
When a communication error
is detected, the system
displays "0".
Max: 10 z
Min: 85 z
When the sensor is
grounded: Full
When sensor was
disconnected or hot short-
DJF1KA
circuited: Empty
1
Priority
1
2
3
4
7
10-910