®
750 Control Panel Operation and Troubleshooting
32
463-3000-08 revised Sept 16, 2013
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.
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.
Welding on Equipment with Electronic Controls
Proper welding procedures are required to avoid damage to electronic controls, sensors and associated components.
The component should be removed for welding if possible.
The following procedure must be followed if the component must be welded while installed on equipment with
electronic controls. This procedure will minimize the risk of component damage.
Warning
Do not ground the welder to electrical components such as the control ground or sensors! Improper
grounding can cause damage to electrical components! Clamp the ground cable from the welder to
the component being welded. Place the clamp as close as possible to the weld to reduce the
possibility of damage.
1.
Stop the engine. Turn the key switch to the OFF position.
2.
Disconnect the negative battery cable from the battery.
3.
Open any installed battery disconnect switch.
4.
Unplug the control system if possible.
5.
Connect the welding ground cable as close as possible to the area to be welded.
6.
Protect the wiring harness from welding debris and spatter.
7.
Use standard welding methods to weld the materials.
Control System Troubleshooting
Control system does not perform self test
Possible Cause
Possible Remedy
Tripped overcurrent protection
Correct fault, replace or reset overcurrent protection
Faulty connection to battery
Correct battery connections (see
Battery Circuit Requirements
)
Faulty control system
Repair or replace control system
Control system performs normal self test, engine cranks, runs and shuts down
Possible Cause
Possible Remedy
Engine Stop LED illuminated
Correct ECU stop condition, use ECU diagnostics