PUMP GP-GOV, FUEL INJ & TFR 8N6117 - Caterpillar

Inputs
The inputs tell EMS how to operate and provide information on the status of the machine systems. There is one sensor type and 14 switch type inputs. Switches and harness wiring provide an open (floating) or ground signal to the switch inputs of the EMS control. The alternator "R" terminal provides a changing signal to the sensor input.The EMS control assigns a different warning category to each uncommitted switch input. See the following chart to determine the warning category of each input.
Table 2
EMS Connector Contact No. Warning Category No.
3 1
4 2
5 3
6 2
7 3
8 3
12 3
14 1
17 3(1)
18 3
19 3(2)
(1) When programming input 3 (connector contact 20) is grounded, connector contact 17 is assigned a warning category 2. With this programming input open, connector contact 17 is assigned a warning category 3.
(2) When programming input 1 (connector contact 9) is grounded, connector contact 19 is assigned a warning category 1. With this programming input open, connector contact 19 is assigned a warning category 3.Switch Inputs - Uncommitted
The ten uncommitted switch inputs (connector contacts 4 through 8, 12, 14, 17, 18, and 19) provide the information used to operate nine alert indicators. During normal operation, these switch inputs are closed to ground. The grounded inputs tell the EMS control that the system conditions are normal and no alert indicators are activated. These inputs receive information from pressure, temperature, flow, level, and position switches located within the machine systems. Some machines are equipped with other electronic controls that supply the EMS control with input information in place of a switch.Switch Input - Speed Sensitive
This input activates indicator 3 if connector contact 18 is open and the "R" terminal frequency (which represents engine speed) is above a certain frequency. This frequency is determined by the status of connector contact 16. With contact 16 closed to ground, the frequency is 376 Hz 10%. With contact 16 open, the frequency is 470 Hz 10%.Switch Input - Alarm Inhibit
A fuel pressure switch provides information about the engine operating status to the alarm inhibit input (connector contact 13). During normal operation (engine running), the fuel pressure switch is open. When the engine is stopped, the fuel pressure switch closes the alarm inhibit input to ground. With this input grounded, the action alarm will not sound.Switch Inputs - Programming
The programming switch inputs (connector contacts 9, 16, and 20) tell the EMS control how to operate. The EMS control operates in a manner that corresponds to the open or grounded state of the programming switch inputs. These inputs receive information from permanent connections within the harness wiring or machine system switches (neutral switch). This information is necessary because of the differences in machine models.Input 1
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