LOFA
TM
MC704
Panel Operation and Troubleshooting Manual
9
9M02-3000-A001-EN
Revision D
3.2.3
Temperature LED (Red)
A solidly illuminated Temperature LED indicates high engine temperature failure. The panel typically senses high
temperature from a ground contact switch on the engine. When a sender/switch combination is used on the
engine, the marking
WK
or
W
generally indicates the switch terminal. This input typically expects a normally open
switch (ground contact when engine temperature is too high). A defective switch or shorting the shutdown input to
ground can cause an over temperature fault indication. Additionally, when using sender/switch combinations,
swapping the
WK
or
W
and
G
terminal can cause unintended shutdowns. The panel can be factory configured to
indicate only temperature failure.
WARNING
IF THE TEMPERATURE SWITCH IS NOT IN CONTACT WITH COOLANT DUE TO COOLANT LOSS,
THE ENGINE IS NOT PROTECTED FROM OVERHEATING.
FOR THE BEST POSSIBLE PROTECTION, CATTRON RECOMMENDS USING OUR SOLID-STATE
COOLANT LEVEL SHUTDOWN SWITCH.
Note:
Most shutdown switches are grounded through the switch body
.
Do not use insulating sealant (i.e., Teflon tape) when installing switches.
Some thermostat housings are composites and do not provide ground for the switch.
3.2.4
AUX LED (Red)
A solidly illuminated AUX LED indicates auxiliary failure (i.e., coolant level, oil level, belt breakage, hydraulic
pressure, etc.). The panel typically senses failure using a ground contact switch. Auxiliary inputs are equipment
specific and determined by the equipment manufacturer. A defective switch or shorting the shutdown input to
ground can cause fault indications. The panel can be factory configured to indicate only AUX failure.
3.2.5
Preheat/OK LED (Green)
A blinking green Preheat/OK LED is the panel preheat indication. When the LED changes to solid, the preheat
period is complete and the engine may be cranked. The LED changes to solid illumination when the engine starts.
There is no indication of afterglow.
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