AUTOMATIC
OPERATION
Automatic
Operation
During automatic operation, the printed circuit board energizes and
de-energizes control relays, the motor starter contactor, and the
pump/motor to automatically refill the Day Tank as fuel is consumed
by the prime mover. Dry contacts for Low Fuel Level, High
Fuel Level, Leak Alarm, and Not In Auto relays are wired to terminals
1-
12 of terminal block TB‘A’ for customer
use. The customer may
utilize these contacts to annunciate low fuel level and high fuel level.
Contacts are rated at the following specifications: 5A@30VDC,
5A@125VAC.
The Day Tank operator selects the Day Tank operating mode via the
three position Day Tank mode selector toggle switch. The operator
may choose Automatic, Manual, or Off. To alert the Day Tank
operator, the red Not In Auto lamp flashes continuously
when the Day Tank mode selector switch is not in the Auto
position. This is the only flashing lamp on the control
panel. Normally the mode selector switch is left in the
automatic position. After initial Day Tank installation,
priming, and fill, the controller printed circuit board will
energize and de-energize the Day Tank pump/motor as
determined by the opening and clos-ing of the fuel level sensors (25%-
FS1, 50%-FS2, 90%-FS3, 95%-FS4). As the Day Tank continues to fill
and the fuel level reaches 50% capacity the Normal Operating Range
L.E.D. will be illuminated. The Day Tank pump/motor will de-
energize when the fuel level reaches 90% (the Normal Operating
Range L.E.D. is extinguished and the Normal Maximum L.E.D. is
illuminated). During normal operation fuel is consumed by the prime
mover and the Day Tank cycles between 50 and 90% capacity,
energizing and de-energizing the motor/pump as necessary. If the
pump/motor continues to run past the 90% capacity level, normally
open fuel level sensor FS4 will close when 95% capacity is reached. At
this point the High Level Alarm L.E.D. will be illuminated and the
pump will de-energize. The fuel level sensors are shown on the
following page.
12
Содержание STS DAY TANK
Страница 1: ...STS DAY TANK PACKAGED DAY TANK SYSTEMS...
Страница 6: ...2 NAMEPLATES AND PLACARDS Nameplates and Placards 3 3...
Страница 7: ...4 Nameplates and Placards 4...
Страница 16: ...13...
Страница 26: ...Technical Data 23...
Страница 27: ...24...