LOFA EP250 Operation and Troubleshooting
463-3000-01 Rev C.1 - 28-Feb-2007
9
Battery Circuit Requirements
Battery Positive Connection
The electronic control system operates on either a 12 VDC or 24 VDC electrical systems. The unswitched
battery positive connection to the control system is made at the weather proof connector. The control system
provides switched positive battery protected by a 15 Amp fuse (12 V or 24 V system).
Protection for the unswitched battery positive circuit is dependent on specific equipment configuration. The
overload protection should not exceed 125% of the sum of all output currents plus 5 Amps for the control
system. Powering the control system through dedicated circuits with appropriate overload protection reduces
the possibility of system damage.
Circuit breakers are preferred over in-line fuses for circuit protection. Over current protection devices should
ideally be located in a central location. If automatic reset circuit breakers are used, consideration of the
environment of the breaker is critical and may affect the trip point. The trip point of some circuit breakers
can be significantly reduced below the rated trip point if the circuit breaker is exposed to high temperatures.
Warning
Disconnecting the battery while the engine is running
may damage electrical components.
When using a battery disconnect switch, LOFA recommends using a
2 pole switch to disconnect both the battery and alternator output.
Battery Negative Connection (Grounding)
Warning
Improper grounding can cause electrical noise, unreliable operation and may damage the
control system or other components. All ground connections must be free from foreign
materials, including paint, which may interfere with proper grounding.
A reliable ground must be provided for the control system.
LOFA recommends the ground connection be made directly to the battery negative.
Grounding through frame members is not recommended.
All ground paths must be capable of carrying any likely fault currents.
Do not reverse the battery polarity. Attempting to crank the engine when the polarity of the
battery connections is reversed may damage the control system.
Note
A maximum of three ring terminals should be connected to a ground stud in order to ensure
integrity of the ground connection. The use of more than three terminals can cause the
connection to become loose.
Voltage Drop
If control system voltage drops below 6 volts for more than one tenth of a second, the control system may
reset causing the self test to reactivate and the engine to shutdown after 10 seconds. Resetting the control