Lofa CANplus 1000 - Voltage Drop; Suppression of Voltage Transients (Spikes); Welding on Equipment with Electronic Controls

9. Miscellaneous
Disconnecting the battery while the engine is running may result in damage
to electrical components. When using a battery disconnect switch, LOFA
recommends using a 2 pole switch to disconnect both the battery and
alternator output.
A maximum of three ring terminals should be connected to a power stud
in order to ensure integrity of the connection. The use of more than three
terminals can cause the connection to become loose.
9.3.4 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. Resetting the control system is equivalent to quickly
turning the keyswitch to off and back to run without starting the engine. Voltage drops can be caused
by a discharged battery, transients from external equipment, improper wire sizes, faulty wiring or
nearby lightning strikes.
9.3.5 Suppression of Voltage Transients (Spikes)
The installation of voltage transient suppression at the transient source is
required. LOFA follows SAE recommended electrical environment prac-
tices.
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.
9.3.6 Welding on Equipment with Electronic Controls
Proper welding procedures should be observed to avoid damage to electronic controls, sensors and
associated components. The component should be removed for welding when 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.
Page 40 LOFA document No. 463-3002-59 Page 40