14
fuel level. If a High Level Alarm condition occurs
and the Day Tank fuel level is reduced to normal
levels the High Level L.E.D. will remain illuminated
until it is reset by the operator. e operator must
place the Day Tank mode selector switch in the O
position and then return it to the Manual or Auto-
matic position to reset the High Level failure. When
High Level is initiated while in Automatic Mode
the Day Tank will continue to operate normally and
cycle from 50% to 90% but the High Level L.E.D. will
remain illuminated until it is reset. When the High
Level mode is initiated while in Manual Mode the
Day Tank pump/motor will cycle between the 90%
and 95% levels as determined by fuel level sensors
FS3 and FS4. Aer the condition is corrected and the
control circuitry is returned to Auto the pump/motor
will resume normal operation and cycle between 50%
and 90%.Fuel level sensors FS1-FS3 (Low Fuel Level
Alarm, Fill Start, and Tank Full, respectively) have
normally closed contacts. FS4 (High Level Alarm)
is the only fuel level sensor with normally open
contacts.
e Fill Test pushbutton is a momentary type. It
may be used to provide a quick verication of overall
pump/motor/fuel level sensor operation when the
system is in the Auto mode. When the mode selec-
tor switch is placed in the O position, the Fill Test
pushbutton is disabled. When the mode selector
switch is in the Automatic position, the Fill Test
pushbutton is enabled.
e operator may energize the pump/motor with
the Test Fill pushbutton to test and cycle the Day
Tank through the specied capacity range. When the
pump is operated by continuously holding the Fill
Test pushbutton the pump/motor will continue to
run past the normal stop level until 95% capacity is
reached, at which point the pump/motor is de-en-
ergized and locked out by fuel level sensor FS4. e
High Level L.E.D. will be illuminated and the High
Level alarm relay will be energized. Contact rated 5A
@ 30 VDC, 5A @ 125VAC maximum.
During normal operation, the pump/motor is ener-
gized and the Fill Start L.E.D. is illuminated when
the Day Tank fuel level reaches 50% capacity. If the
fIll teSt
puSHbutton
low level fIll
alarm
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