GASKET 8S0632 - Caterpillar

This document provides the necessary information for correct electrical/electronic installation and application of Caterpillar Electronic Marine Display Systems.Battery Circuit Requirements And Considerations
Grounding (Minus Battery Bus Bar Connections)
Improper grounding will cause uncontrolled and unreliable circuit paths. This can result in damage to the engine crankshaft main bearings, crankshaft journal surfaces or other engine components. Improper grounding may also cause activity which may degrade vessel electronics and communication equipment.
Proper grounding for vessel and engine electrical systems is necessary for engine/vessel performance and reliability. Problems with intermittent or improper power or ground connections are often very difficult to diagnose and repair. All negative battery connections MUST have a common ground that terminates at a negative battery bus bar. Refer to Figure 1.The alternator, starting motor, and all electrical systems MUST be grounded to -Battery. The alternator and starting motor must also meet marine isolation requirements. For engines which have an alternator grounded to an engine component, a ground strap MUST connect that component to -Battery and the component MUST be electrically isolated from the engine.A -Battery Bus Bar with a direct connection to the Minus Battery Terminal is recommended for all engine common ground connections.Operator Station Grounding
Caterpillar recommends a separate Engine Room Minus Battery Bus Bar for all engine ECM connected electronics. This ensures that the ECM and all associated components, including switches, sensors and electronic display modules, have a common reference point. All -Battery connections should begin at the -Battery connection of the component being wired and terminate at the -Battery Bus Bar.The connection from the Engine Room -Battery Bus Bar to the bridge display Station -Battery Bus Bar should be made with a minimum of 12 AWG wire. Each Station -Battery Bus Bar is for the display modules only and should not have any other electrical components connected to it. -Battery Bus Bar connections made in manner shown in Figure 1 ensures that all components in the system have the -Battery Bus Bar as a common reference point at the engine room. Properly grounded systems are a MUST for reliable operation.
Figure 1 - Operator Station Grounding Connections+Battery For ECM Power
Powering the electronic control system on dedicated fused circuits reduces the possibility of degraded electronic control system performance due to voltage transients. Additional loads should not be connected between the ECM and ECM circuit protection. The ECM and display MUST be powered from the same switch (source).The ECM battery connections are made at the ECM Customer Connector using 14 AWG wire. Refer to the Engine Schematic and Engine Installation Guide for information on required connections and circuit protection ratings. Caterpillar recommends using circuit breakers for circuit protection. Circuit breakers should be placed with other vessel circuit protection devices in a centrally located, dedicated panel.If automatically resetting circuit breakers are used, consideration of the breaker location environment and its effect on the trip point is critical. The trip point of some circuit breakers can be significantly reduced below the rated trip point if exposed to high temperatures. This can cause