AUTOMATIC START/STOP SYSTEM
SYSTEMS OPERATION
AUTOMATIC 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 control
switch (ACS).
An automatic start/stop system is used when a
standby electric set has to give power to a system if the
normal (commercial) power supply has a failure. There
are three main sections in the system. They are: the
automatic transfer switch, the start/stop control panel
(part of switch gear) and the electric set.
AUTOMATIC TRANSFER SWITCH
The automatic transfer switch normally connects the
3-phase normal (commercial) power supply to the load.
When the commercial power supply has a failure the
switch will transfer the load to the standby electric set.
The transfer switch will not transfer the load from
commercial to emergency power until the emergency
power gets to the rated voltage and frequency. The
reason for this is, the solenoid that causes the transfer of
power operates on the voltage ’from the standby electric
set. When the normal pow-
er returns to the rated voltage and frequency and the
time delay (if so equipped) is over, the transfer switch will
return the load to the normal power supply.
AUTOMATIC TRANSFER SWITCH (ATS)
1.
E1, E2 and E3 input
3.T1, T2 and T3 output
to ATS from
from ATS to the load.
emergency source.
4.Transfer mechanism.
2.
N1, N2 and N3 input
to ATS from normal
source.
14
