HARNESS AS-HEATER & AIR COND 3517050 - Caterpillar

Fault Circuit Operation
Low Oil Pressure (OP)
Overheating Coolant (WT)
Engine Overspeed (OS)In an engine that is operating properly, electric current for the gas shutoff valve (GSOV) and the slave relay SR1 travel through switches. These switches are the following switches: the overspeed (OS) switch, the water temperature switch (WTS) and the oil pressure switch (OPS1). Any one of the following faults will stop the current flow to the GSOV and the SR1. When the GSOV is de-energized, the GSOV will close in order to shut off the gas. SR1 will cause the magneto to be grounded. Sparks will be prevented from entering the cylinders.
If the oil pressure drops below the rating of the OPS1, the contacts between terminal OPS1-1 and terminal OPS1-2 will open.
If the coolant temperature exceeds the setting of the WTS, the contacts between terminal WTS-2 and terminal WTS-3 will open.
If the engine speed increases above the overspeed setting of the ESS (OS), the contact between terminal ESS-8 and terminal ESS-9 will open.Note: A reset button on the ESS must be pushed in order to open the overspeed switch ESS (OS). When this is done, the engine can be restarted.
Unburned gas can ignite when the engine is restarted.
When a gas engine has been stopped by a grounded magneto, certain steps must be followed. Run the engine while the gas valve is turned off and the magneto is grounded. Run the engine for 10 seconds to 15 seconds. This will clear the unburned gas from the exhaust system.
To avoid engine damage, repair or correct the problem that causes engine shutdown before restarting.
Electric Governor Control System
An Electric Governor Control EGC may be used on an engine. The operation of this governor is close to the operation of the nonelectric governor.Electrical Schematic ETR, Independent, Full Protection
Refer to the notes for using the Electrical Schematic for ETR, Independent, Full Protection.NOTES D: If the electric starting motor is not used, connect the battery cables to the studs for the power input. These studs are located on the bottom of the power distribution box. In some cases, the electric starting motor may not be used. In some cases, the charging alternator arrangement may not be used. If these parts are not used, connect the positive lead from a power source to the terminal TS1. This positive lead must be 24 volts from a DC power source. Terminal TS1 is located on the junction box terminal strip. Connect the negative lead to terminal TS28.M: If a remote normal stop switch is used, a jumper wire must be removed. Remove the jumper wire between terminal TS-4 and terminal TS-5.N: Shutoff contactor for the magnetoAltronic ... G
Illustration 18 g00607958
Automatic Start/Stop System
This system (full system without switchgear) is not an independent system. This system is made for a customer that owns a switchgear. The switchgear is wired into the junction box. The switchgear will monitor certain engine parameters. The following engine parameters will be monitored: engine overspeed, oil pressure, coolant temperature and starter motor overspeed. The gas shutoff valve