LOFA
TM
MC704
Panel Operation and Troubleshooting Manual
8
9M02-3000-A001-EN
Revision D
3.1 Preheat Options
3.1.1 Preheat Output
Preheat is a 3 A positive output for control of an external power relay with predetermined preheat and afterglow
times. A relay should be selected with appropriate amperage capacity for the installed cold starting aid
(glowplug, intake air heater, etc.). Applications using multiple cold starting aids may require multiple relays.
Note:
Consult engine documentation when selecting cold starting aid, power relay and heating specifications.
3.2 Indicators
3.2.1
Battery LED (Red)
A solidly illuminated Battery LED indicates a battery charge failure. A battery charge failure may be caused by
a faulty alternator, broken drive belt or the alternator not excited. A battery voltage reading of approximately
14 V on 12 V systems (28 V on 24 V systems) while the engine is running indicates the battery is charging
properly. Irregular blinking of the Battery LED may indicate a failing charge circuit. The panel can be factory
configured to indicate only battery charge failure.
3.2.2
Oil Pressure LED (Red)
A solidly illuminated Oil Pressure LED indicates low oil pressure failure. The panel typically senses low oil
pressure from a ground contact switch on the engine. When a sender/switch combination is used on the engine,
the marking
WK
generally indicates the switch terminal. This input typically expects a normally closed switch
(ground contact when oil pressure is low). A defective switch or shorting the shutdown input to ground can cause
low pressure fault indication. Additionally, when using sender/ switch combinations, swapping the
WK
and
G
terminal can cause unintended shutdowns. The panel can be factory configured to indicate only oil pressure
failure.
WARNING
LOW OIL PRESSURE IS NOT AN INDICATION OF LOW OIL LEVEL.
FOR THE BEST POSSIBLE PROTECTION, CATTRON RECOMMENDS USING OUR SOLID-STATE
OIL 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.
!
