LOFA EP250 Operation and Troubleshooting
10
463-3000-01 Rev C.1 - 28-Feb-2007
system is equivalent to quickly turning the key switch to off and back to run without starting the engine. Since
the control system did not sense a start signal, the fuel run/stop solenoid deactivates after 10 seconds.
Voltage drops can be caused by transients from external equipment, improper wire sizes, faulty wiring or
nearby lightning strikes. In the absence of a
LOFA Power Box
, relays may be needed for long wire runs.
Suppression of Voltage Transients (Spikes)
Warning
The installation of voltage transient suppression at the transient source is required.
LOFA follows SAE recommended electrical environment practices.
Inductive devices such as relays, solenoids and motors generate voltage transients and noise in electrical
circuits. Unsuppressed voltage transients can exceed SAE specifications and damage electronic controls.
I
Relays and solenoids with built-in voltage transient suppression diodes are recommended whenever possible.
Refer to the illustration for proper installation of diodes when built-in voltage transient suppression is not
available.
Locate inductive devices as far as possible from the components of the electronic control system. When
using electric motors it may also be necessary to add isolation relays to eliminate voltage transients, noise
and prevent back feed.
Note
LOFA harness assemblies typically include all required engine control suppression devices.
Added equipment will require additional protection.
