Komatsu 830E-AC Shop Manual page 214

5 Minute Idle Timer
5 minute idle timer (4) is activated when the operator
presses the 5 minute idle timer engine shutdown
switch on the instrument panel. (This is a momentary
switch that also latches the 5 minute idle timer in the
energized position.) When the timer is energized,
internal contacts close and energize the relay.
The 5 minute idle timer circuit automatically provides
approximately five minutes of engine idle time before
actual engine shutdown occurs. This system allows
the engine cooling system to circulate coolant to
reduce and stabilize engine component tempera-
tures, when engine power requirements are minimal,
resulting in extended engine life.
The circuit is controlled by a 3-position rocker switch.
Pressing the bottom of the switch will turn the circuit
OFF. The engine will shut down by use of the key
switch, console mounted engine shutdown switch, or
the ground level shutdown switch.
With the rocker switch in the middle position, the cir-
cuit is ON, but does not activate the 5 minute idle
timer circuit. The engine can be shut down immedi-
ately using any one of the three switches described
above.
When the top of the switch is depressed and held
momentarily, the idle timer circuit is activated. When
released, the switch will return to the ON (middle)
position, and the 5 minute idle timer circuit is latched
on through the switch. The 5 minute idle timer indica-
tor lamp on the overhead display will also illuminate.
The engine will not shut down with the key switch.
Moving the key switch to the OFF position, will cause
the engine to shut down after the 5 minute time delay
is completed. The normal shutdown sequence will
then occur.
However, if during the 5 minute idle timing sequence,
the 5 minute delay switch on the instrument panel is
pressed to the OFF position, the center console
engine shutdown switch is depressed, or the ground
level shutdown switch is activated, the engine will
shut down immediately, followed by the normal shut-
down of all systems.
D3-4
Test the 5 minute idle timer circuits as follows:
1. With the key switch ON, press the engine shut-
2. Turn the key switch OFF and verify the follow-
3. Repeat Step 1. While monitoring voltage at cir-
Pulse Voltage Modulator (PMV)
The Pulse Voltage Modulator (6) receives a load
curve signal from the engine controls and converts it
to a 0 to 10 volt signal for use by a PSC card in the
Integrated Control Panel (ICP).
Control Power Relay
Control power relay (8) is energized when the control
power switch, located in the main control cabinet, is
turned ON. This relay isolates the GE control power
from the truck circuits and provides power to non-
propulsion system 24VDC components.
Auto Lube Timer
The automatic lubrication system lubrication interval
is controlled by auto lube timer (9). Lubrication cycle
frequency can be adjusted by removing the timer
cover and selecting one of five different timing inter-
vals available. System "on" time is automatically
determined by the timer and is not adjustable. Refer
to Section P for additional automatic lubrication sys-
tem details.
24VDC Electrical System Components
down switch firmly to the momentary position
and release (switch will return to the ON posi-
tion).
ing:
Circuit 712 (to ground) remains 24 volts for
approximately 5 minutes. After 5 minutes,
the voltage drops to 0.
The 5 minute idle indicator lamp on the
overhead display is ON when circuit 712
reads 24 volts.
cuit 712, turn the key switch OFF. Turn the
engine shutdown switch off.
Verify that the voltage at circuit 712 drops
to 0 when the shutdown switch is turned to
OFF.
10/06 D03036