MANIFOLD-EXHAUST 9S2355 - Caterpillar

In order to synchronize the throttle control on multiple engines, the Electronic Control Module (ECM) receives four input signals to the ECM. One of the inputs is the primary throttle signal. Another one of the inputs is the secondary throttle signal. The other two inputs are from the engine synchronization switch. These four inputs can be used to synchronize the throttle signals from multiple engines. The response from the ECM to the four input values depends on the values in the following programmable parameters.
Number of synchronized engines
Engine location
Secondary throttleThe logic and wiring for synchronization is dependent upon the number of engines that are being synchronized. The ECM response is dependent on the programmed engine location. Refer to Table 1 for the engine locations that are valid for a given number of engines.
Table 1
Number of Synchronized Engines Valid Engine Locations Secondary Throttle
none Port
Starboard
Center
Engine #n Enabled
Disabled
2 Port
Starboard unavailable
3 Port
Starboard
Center unavailable
4 or more Engine #n unavailable In a single engine installation, there could be up to two throttle inputs. One of the inputs is the primary throttle signal. Another one of the inputs is the secondary throttle signal. The secondary throttle is activated with a single switch. Illustration 1 shows the wiring for a single engine installation.
Illustration 1 g01331941
Wiring for the throttle in a single engine installation
Table 2 shows the logic for a single engine installation. If the primary throttle will be used, disable the secondary throttle by setting the parameter for the secondary throttle to the disabled position.
Table 2
Engine Synchronization Input Active Throttle Synchronization
Status
1 2
Open Open Primary unavailable
Open Low Secondary unavailable
Low Open Primary unavailable
Low Low Primary unavailable In a twin engine installation, the ECM will assume that one engine is on the port side of the vessel and that the other engine is on the starboard side of the vessel. The ECM will label the engines as the port engine and as the starboard engine on the service tool and on the display. The operator can synchronize both engines in order to be controlled with either the port throttle or the starboard throttle. The operator could choose to not synchronize the engine throttles at all. Illustration 2 shows the wiring for twin engine installations.
Illustration 2 g01331942
Wiring for the throttle in a twin engine installation
The logic for Illustration 2 is shown in Table 3.
Table 3
Synchronization
Status No Synchronization Synchronization
Port Side Synchronization
Starboard Side
Port Engine Synchronization Input
1 Open Low Open
Engine Synchronization Input
2 Open Open Low
Active Throttle Primary Primary Secondary
Starboard Engine Synchronization Input
1 Open Open Low
Engine Synchronization Input
2 Open Low Open
Active Throttle Primary Secondary Primary Table 4 shows the logic for the Port side control in a twin engine installation.
Table 4
Engine Synchronization Input Active Throttle Port ECM
Synchronization
Status
1 2
Open Open Primary No Synchronization
Open Low Secondary Synchronization on