Alarm Indicating Device (Aid) System - Komatsu 830E Shop Manual

ALARM INDICATING DEVICE (AID) SYSTEM

The Alarm Indicating Device (16) is connected to the
electrical accessories circuits to provide the operator
with a warning indication of a malfunction. This sys-
tem consists of up to eight printed circuit cards,
located under the passenger seat in the operators
cab. The actual quantity of cards will depend on
options installed on the truck.
The AID system enables the indicating lights to be
flashing or constant. The AID also has the capability
of operating an audible alarm along with the light.
The eight printed circuit cards are (refer to Figure 3-
2):
• Diode Matrix (With Sound) Card . . . . . . (Slot 1)
• Diode Matrix (Without Sound) Card . . . (Slot 2)
• Hot Switch Inverter Card . . . . . . . . . . . (Slot 3)
• Hot Switch Inverter Card . . .(Slot 4) (Not Used)
• Temperature Card . . . . . . . . . . . . . . . . . (Slot 5)
• Oil Level Card . . . . . . . . . . . . . . . . . . . . (Slot 6)
• Temperature and Latch Card . . . . . . . . (Slot 7)
• Coolant Level and Flasher Card . . . . . (Slot 8)
NOTE: Each card is identified with a number which
corresponds with a mating number on the housing. If
cards are removed, make sure card numbers
correspond with housing numbers during installation
(See Figure 3-2).
The following information briefly describes each card
and its function. Refer to Section "R" for circuit com-
ponents described below.
Prior to welding on the truck, disconnect the AID
system plug-in cards.
Diode Matrix (Without Sound)
The Diode Matrix Without Sound Card (2, Figure 3-2)
consists of a series of diodes capable of working with
eight different indicator circuits. The indicator light
can be a flashing light by connecting it to the 12F cir-
cuit or a steady light by connecting it to the 12M cir-
cuit. In addition, some of the indicator light circuits
are routed through a dimmer module to allow the
operator to vary the intensity of the lamps. These
D3-4
lamps are fed by circuits 12FD (flashing) and 12MD
(steady).
When an indicator circuit is not activated, there is no
ground circuit for the bulb. When the Indicator detect-
ing switch activates the circuit, it grounds the lamp
and grounds the flasher circuit through the diodes.
Any circuits connected to terminals C1 through C8
will operate in the same manner. The alarm horn is
not activated by this card.
Diode Matrix (With Sound)
The Diode Matrix With Sound Card (1, Figure 3-2)
works very much like the other Diode Matrix Card,
except that it contains extra diodes to activate the
alarm horn in addition to the flasher. The circuits con-
nected to terminals A1 through A8 operate in the
same manner.
24VDC Electrical System Components
FIGURE 3-2. AID SYSTEM CARD ENCLOSURE
1. Diode Matrix With Sound
2. Diode Matrix Without Sound
3. Hot Switch Inverter
4. Hot Switch Inverter (Not Used)
5. Temperature & Latch
6. Coolant Level & Flasher
D03026