Specifications

LOFA EP250 Operation and Troubleshooting
4 463-3000-01 Rev C.1 - 28-Feb-2007
To prevent unintentional engine shutdowns caused by intermittent conditions (i.e., pressure spikes, coolant
movement) the control system requires a constant 1 second fault input to cause engine shutdown.
Warning
When used in combination with mechanical float type switches
engine vibrations may prevent constant contact closure.
The control system can be configured to shutdown with no delay.
See the EP250 Configuration Guide for detailed preheat control instructions.
The control system has the ability to shut down the engine for over speed. Over speed will be indicated via a
blinking Battery Charge LED. If the control system is equipped with the DPG, the display will also indicate
over speed shutdown. The control system senses RPM either by the frequency terminal of the alternator,
proximity switch or magnetic pick-up.
Preheat Options
Preheat Output
Preheat is a 1A 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.
Optional or additional components may allow preheat time to be modified by sensing ambient temperature.
Depending on specific configuration, this output may provide either high side (battery positive) or low side
(ground) control.
Note
Consult engine documentation when selecting cold starting aid,
power relay and heating specifications.
Preheat Indication Input
With this option, the preheat LED provides indication for an external preheat control system. Depending on
specific controls and configuration, this input can be configured to accept either high side (battery positive)
or low side (ground) control.
Indicators
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 volts on a 12 volt system (28 volts on a 24 volt system) while the engine is running
indicates the battery is charging properly. Irregular blinking of the Battery LED may indicate a failing charge
circuit. The system can be configured for battery charge failure to indicate only.
Overspeed Indication
A regularly blinking Battery LED indicates the configured overspeed RPM has been exceeded. The overspeed
RPM can be verified, changed or disabled (see the EP250 Configuration Manual for details).