LOFA
TM
MC704
Panel Operation and Troubleshooting Manual
12
9M02-3000-A001-EN
Revision D
3.4.3 Voltage Drop
If panel voltage drops below 6 V for more than 0.1 seconds, the panel may reset, causing the self-test to
reactivate and the engine to shut down after 30 seconds. Resetting the panel is equivalent to quickly turning the
key switch to off and back to run without starting the engine. Since the panel did not sense a start signal, the fuel
run/stop solenoid deactivates after 30 seconds. Voltage drops can be caused by external equipment inrush
current, improper wire sizes or faulty wiring. Relays may be needed for long wire runs.
3.5 Suppression of Voltage Transients (Spikes)
WARNING
THE INSTALLATION OF VOLTAGE TRANSIENT SUPPRESSION AT THE TRANSIENT SOURCE IS
REQUIRED.
CATTRON 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.
Relays and solenoids with built-in voltage transient suppression diodes are recommended whenever possible.
Refer to the illustration below 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 panel. When using electric
motors, it may also be necessary to add isolation relays to eliminate voltage transients and noise and to prevent back
feed.
Note:
Cattron
harness assemblies typically include all required engine control suppression devices
.
Added equipment will require additional protection.
!
