Usage:
Caterpillar recommends transient suppression be installed at the source of the transient as well as in the ECM. Caterpillar follows a proprietary stringent electrical environmental standard similar to SAE J1455.
The use of inductive devices such as relays and solenoids can result in the generation of voltage transients on the battery lines. Voltage transients that are not suppressed can exceed SAE J1455 specifications and degrade electronic control system performance.
The OEM should specify relays and solenoids with built-in voltage transient suppression on the vessel where possible.
Figure 1.3 - Examples of Voltage Transient Suppression
Refer to Figure 1.2 Examples of Voltage Transient Suppression for possible suppression techniques used to minimize the generation of voltage transients from relays and solenoids without built-in voltage transient suppression. These include, but are not limited to, installing a properly sized diode or resistor in parallel with solenoid and relay coils.
Inductive devices should be located to maximize the distance from electronic control system components. OEM installed wiring harnesses should be routed to maximize the distance from the control system wiring harness to avoid inductive coupling of noise transients.