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Hot Switch Inverter Card (Slot 4) (Not Used)
Oil Level
The Oil Level Card is used to turn on the Low Oil Level
Indicator Light to warn the operator engine oil/hydrau-
lic tank oil level is below acceptable levels. The oil float
is connected to a variable resistor. As the oil level
decreases, the resistance goes down causing Q3 to
turn on, grounding the indicator light and alarm horn.
Temperature
The Temperature Card (Optional) is used to turn on
the High Oil Temperature Indicator Light. The indicator
light tells the operator that the hydraulic tank oil tem-
perature has exceeded acceptabale levels. Normal
o
temperature setting is 250
ture goes up the resistance in the probe decreases
providing a ground path for the indicator light and
alarm horn.
Diode Matrix (Without Sound)
The Diode Matrix Without Sound Card 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 circuit or a steady light
by connecting it to the 12M circuit. In addition, some
of the indicator light circuits are routed through a
dimmer module to allow the operator to vary the inten-
sity of the lamps. These 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.
D03019 04/01
o
F (121
C). As the tempera-
24VDC System Components
Diode Matrix (With Sound)
The Diode Matrix With Sound Card 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 connected to terminals A1
through A8 operate in the same manner.
Lamp Test
All of the card circuits are connected to the Lamp Test
Switch on the overhead display area. In normal opera-
tion, these circuits are open and not functional. When
the operator pushes the Lamp Test Switch, it activates
all the indicator circuits by grounding them. This is used
to verify that all lamps are functional.
D3-5
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Table of Contents
Troubleshooting
