SHROUD AS 5215206 - Caterpillar

Shutdown Systems
Shutdown systems utilize components which are set at critical operating temperature, pressure, level or speed than the alarm components to protect the engine from damage. When any of these components shut the engine down, the problem causing the shutdown must be corrected before attempting to restart the engine.The system is equipped with electronic governing which detects engine faults and ensures fuel shutoff.Emergency shutoff controls may be electrically or mechanically operated. Familiarize yourself with the types and locations of the shutoff controls, the conditions which cause each control to function, and the resetting procedure required to start your engine.
Manual Shutoff Lever
Emergency Stop button (if equipped)In the event of an overspeed, shut down the engine with the Manual Shutoff Lever (for fuel shutoff ONLY) or push the Emergency Stop button (if equipped), and both air and fuel will be shut off.
Typical ExampleThe air shutoff requires manually resetting of the air shutoff levers on the bank air inlets (on the 3516, BOTH banks) of the engine before starting the engine. The RESET button on the speed switch must be manually pushed before the engine can be restarted.The operation of all electrical shutoff controls is similar. A critical operating condition actuates a switch to stop the engine. The shutoff control requires resetting before the engine can start (on an overspeed shutdown only).The shutdown controls should be tested every 92 Day FRA Inspection or 1000 service hours by authorized personnel.Always determine the cause of the shutdown and have the necessary repairs made before restarting the engine. Never use the Emergency Shutdown controls or Emergency Stop button (if equipped) for a normal stopping procedure. Refer to "Engine Stopping" section in this publication for proper normal shutdown procedure.Alarm Systems
Typical Installation Refer to Locomotive OEM for alarm and annunciator installation. Alarm systems and features may or may not be connected to audible or visual indicators as described in this publication.
Engine Mounted ContactorsAlarm switches consist of a sensor and contactor. The sensor such as magnetic pickup for detecting speed, or pressure or temperature sensors are wired to a contactor which activates an alarm circuit in the Annunciator Panel.Alarm switches and sensors are set at a less critical temperature, pressure or level limit than the engine shutdown controls.The purpose of the alarm switch is to warn the operator that an unsafe operating condition is beginning to occur.The Annunciator Panel has lights and an audible device to warn the operator of a malfunction or abnormal engine operating condition. Each alarm contactor and switch is electrically connected to an indicator light or audible indicator. The alarm will continue until the condition is corrected.When an alarm is activated, corrective measures must be taken before the situation becomes an emergency to avoid possible damage to the engine.If corrective measures are not taken within a reasonable time, engine damage could result, or if equipped, a corresponding shutdown device will stop the engine.The alarm will continue until the condition is corrected or the alarm is reset by the operator. The alarm circuits merely