AUTOMATIC START/STOP SYSTEMSYSTEMS OPERATIONAUTOMATIC START/STOP SYSTEM(Non-Package Generator Sets)AUTOMATIC START/STOP SYSTEM SCHEMATIC(Hydraulic Governor)1. Starter motor and solenoid. 2. Shutoff solenoid. 3. Fuel pressure switch. 4. Water temperature switch. 5.Oil pressure switch. 6. Overspeed contactor. 7. Battery. a Low lubricating oil pressure light (OPL). 9.Overcrank light (OCL). 10. Overspeed light (OSL). 11. High water temperature light (WTL). 12 Automatic controlswitch (ACS).An automatic start/stop system is used when astandby electric set has to give power to a system if thenormal (commercial) power supply has a failure. Thereare three main sections in the system. They are: theautomatic transfer switch, the start/stop control panel(part of switch gear) and the electric set.AUTOMATIC TRANSFER SWITCHThe automatic transfer switch normally connects the3-phase normal (commercial) power supply to the load.When the commercial power supply has a failure theswitch will transfer the load to the standby electric set.The transfer switch will not transfer the load fromcommercial to emergency power until the emergencypower gets to the rated voltage and frequency. Thereason for this is, the solenoid that causes the transfer ofpower operates on the voltage ’from the standby electricset. When the normal pow-er returns to the rated voltage and frequency and thetime delay (if so equipped) is over, the transfer switch willreturn the load to the normal power supply.AUTOMATIC TRANSFER SWITCH (ATS)1.E1, E2 and E3 input3.T1, T2 and T3 outputto ATS fromfrom ATS to the load.emergency source.4.Transfer mechanism.2.N1, N2 and N3 inputto ATS from normalsource.14
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