Liberty Pumps SX-Series - Manual (Page 10)

Operations
Three phase simplex control panels are designed
to operate in a three fl oat system as standard.
When all fl oats are in the open or OFF position,
the panel is inactive. As the liquid level changes
and closes the stop fl oat, the panel remains inac-
tive until the start fl oat also closes. At this point
the pump will start, assuming the HOA switch is in
the AUTOMATIC mode and the power is ON. The
pump will remain ON until both the stop and start
fl oats open (return to the OFF position). If the liquid
level travels beyond both the stop and start fl oats
and reaches the alarm fl oat, the audio/visual alarm
will be activated. The alarm horn can be silenced
by pressing the silence switch.
Alarm System (Horn and Indicator)
When an alarm condition occurs, a red light and
a horn will be activated. If the test/normal/silence
switch is moved to the silence position, the horn will
be silenced. When the alarm condition is cleared,
the alarm system is reset. The alarm system can
be tested by moving the test/normal/silence switch
to the test position.
HOA Switch
A hand-off-automatic switch is provided for the
pump. In the hand mode, the pump will turn on
unless other safety features are employed. In the
automatic mode, the pump will turn on from com-
mands by the fl oat switches.
Motor Protective Switch
A motor protective switch is supplied for the pump
to provide an adjustable overload, branch circuit
protection and disconnect. The overload must be
set in the fi eld. To set the overload, dial the amp
scale to the pump’s full load amps (FLA). If the
FLA’s are unknown, use a calibrated amp me-
ter to measure the pump amperage draw under
loaded conditions. An auxiliary contact is wired in
series with the magnetic contactor coil so that on
an overload trip, the magnetic contactor will be
disabled. In the event of an overload trip, the mo-
tor protective switch must be reset by fi rst turning
the handle counterclockwise to the OFF position
and then turning the handle 90
o clockwise to the
ON position.
Pump Run Light
The run light will be ON in either the hand or the
automatic mode when the pump is called to run.
Control Power Light
Light will illuminate when the control circuit has
power.
Alarm Power Light
Light will illuminate when the alarm circuit has
power.
Alarm Fuse
Provides alarm circuit protection and provides a
means of disconnecting alarm circuit power.
Control Fuse
Provides control circuit protection and provides a
means of disconnecting control circuit power.
Dry Auxiliary Contacts (optional)
Normally open - Contacts are open under normal
conditions and closed when alarm condition is
present.
Normally closed - Contacts are closed under
normal conditions and open when alarm condition
is present.
Both types automatically reset once alarm condi-
tion is cleared.
Seal Failure Circuit and Indicator Light
(Optional)
The seal fail circuit has resistance sensitivity and
will sense the presence of water in the pump seal
chamber. Upon installation, turn the sensitivity dial
on the seal fail module to the point where the light
turns on, then dial back slowly until the light turns
off. If water enters the seal chamber at this point,
the seal chamber circuit will sense a change in
resistance. After a short time delay, the indicator
light will turn on. When the condition is cleared, the
relay will de-energize and the indicator light will turn
off. The seal fail relay has a sensitivity adjustment
so that false readings may be tuned out.
Thermal Cutout (Optional)
The thermal cutout circuit is wired in series with
the magnetic contactor coil. If the pump’s thermal
switch opens on high temperature, the magnetic
contactor will turn off and stop the pump. When
the thermal switch cools and closes, the magnetic
contactor will turn on if the pump is called to run.
NOTE: Some options ordered may not be included
in this manual.
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