LOFA
TM
MC704
Panel Operation and Troubleshooting Manual
7
9M02-3000-A001-EN
Revision D
3
Operation
Turning the panel key to the run position starts a self-test which causes all LEDs to flash three times, activates the
alarm output (if preheat is not used) for one second and enables the fuel run/stop solenoid output. After self-test,
the LEDs indicate the state of the inputs they monitor. The normal indications are battery charge and oil pressure
on most applications. If these LEDs are not illuminated at this time, it may indicate the inputs are not properly
connected.
The Preheat/OK LED begins to blink when the key switch is turned to the run position if automatic preheat is
section). Preheat time varies from application to application. After waiting for
the Preheat/OK LED to become solid, the engine is cranked by turning and holding the key switch in the start
position until the engine starts. The key switch is spring loaded to return automatically to the run position when
released.
Note:
The key switch is equipped with a mechanical start locking device
.
An attempt to crank the engine again can only be made by turning the key switch to the off position to
reset the start locking mechanism.
If the engine is not started within 30 seconds of turning on the panel, the fuel run/stop solenoid output is turned off
to prevent battery discharge when the key switch is left in the run position. The fuel run/stop solenoid output is
turned off after 30 seconds even if preheating. As soon as the key switch is turned to the start position, the
solenoid output is enabled. The afterglow cycle begins when the key switch returns to the run position.
Note:
If conditions do not warrant preheat, the engine may be started by turning the key to the start position
without waiting for the preheat time to expire.
Panel instrument power, including the hourmeter and voltmeter, is provided by the fuel run/stop solenoid output. If
the instruments do not power up when the key is turned to the run position, this indicates a problem with the
solenoid circuit (see the
Fuel Run/Stop Solenoid Troubleshooting
After the engine starts, the panel electronics ignore all shutdown conditions for the first 10 seconds. This delay
eliminates the requirement to hold a by-pass override button during starting and allows the engine conditions such
as oil pressure to normalize. The 10-second timer starts when the key switch returns to the run position.
Note:
Starter input is required for correct panel operation. If the starter motor input is not activated (connected
to battery positive) and the engine is started through another means (i.e., air starter) the engine will
shutdown 30 seconds after the key switch is turned to the run position.
To prevent unintentional engine shutdowns caused by intermittent conditions (for example, pressure spikes or
coolant movement), the panel requires a constant 1/3-second fault input to cause engine shutdown.
WARNING
WHEN USED IN COMBINATION WITH MECHANICAL FLOAT TYPE SWITCHES, ENGINE
VIBRATIONS MAY PREVENT CONSTANT CONTACT CLOSURE.
!
