5647000M
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
5 | EN
Pump System Components
Control Panel
Manual LSG/LSGX-Series pumps require a separate, approved
pump control panel for automatic operation. Operation of these
models will be according to the control selected. Refer to separate
manufacturer’s instructions supplied with the unit. Verify the
electrical specifications for the control panel properly match those
of the pump.
Mounting, installation, and wiring connections are specific to the
control panel used. Refer to the manufacturer’s instructions
supplied with the unit.
IMPORTANT:
When connecting an LSG/LSGX-Series pump to an
existing control panel, verify the panel is correctly sized and
equipped for the pump.
Control panels designed for use with the LSG/LSGX-Series pumps
available from Liberty Pumps can be found at http://
www.LibertyPumps.com/Portals/0/Files/panel_selection_guide.pdf
or contact Liberty Pumps.
LSG202M-C and LSGX202M-C models require a panel-mounted
start circuit consisting of a start capacitor, run capacitor, and start
relay, which are available separately. Refer to Table 1 for these
control panel components.
Table 1. Control Panel Components 1-Phase
Required Component and
Specification
Liberty Pumps P/N
208V 1-phase Start Kit
(contains 3 items listed separately below)
Start Capacitor, 200–240 µF 220 VAC
Run Capacitor, 50 µF 370 VAC
Start Relay, Mars Potential Relay 19551 #551
Overload Protection
Three-phase LSG/LSGX-Series grinder pumps require overload
protection in the control panel. The motor control unit shall be
approved and shall be properly sized or adjusted for the full load
input power indicated on the pump nameplate. It is important to
properly adjust or select the motor control overload protection.
The full load amperes on the nameplate should be used as a
baseline, but it is important to consider that events such as supply
voltage variation or large solids passing through the pump can
temporarily increase current draw. To avoid possible nuisance
tripping, it may be necessary to adjust overloads to a value slightly
higher than the full load input power indicated on the pump
nameplate.
Thermostat
Single-phase pump models are protected from locked rotor and
running overloads by a thermal overload (thermostat) integrally
mounted to the motor and wired to shut down the pump if
overheating occurs. The thermostat resets automatically after the
pump has cooled.
Power and Control Cords
Do not remove cord and strain relief, and do not connect
conduit to pump.
The power and control cords cannot be spliced; a junction box
may be used.
IMPORTANT:
Each cord has a green lead. This is the ground wire
and must be grounded properly per NEC
®
and/or local codes.
Float Switches
Pump ON and OFF cycles are controlled by float switches in the
wet well (basin). Automatic pumps have a “piggyback” float switch
attached to the side of the pump, while manual pumps have float
switches attached to the control panel. Refer to control panel or
switch instructions for proper electrical connection.
Float Sequence: Piggyback (Automatic Models)
1.
As the liquid level in the basin rises, the float tilts, closing the
switch. This starts the pump.
2.
The pump runs until the liquid level falls below the pump OFF
level of the float (factory set at 7 in), emptying the basin.
Float Sequence: Simplex (Manual Models)
1.
As the liquid level in the basin rises, the pump OFF float tilts,
closing the switch. This level must be set at a minimum of
7 in. As the liquid level continues to rise, the pump ON float
tilts. This switch closes, starting the pump.
2.
The pump runs until the liquid level falls below the pump OFF
float, emptying the basin.
3.
In the event of a malfunctioning float switch, control relay, or
pump, the liquid level rises and tilts the HIGH LEVEL ALARM
float. The alarm system will activate.
Float Sequence: Duplex (Manual Models)
1.
As the liquid level in the basin rises, the pump OFF float tilts,
closing the switch. As the liquid level continues to rise, the
lead pump ON float tilts. This switch closes, starting the lead
pump.
2.
The pump runs until the liquid level falls below the pump OFF
float, emptying the basin.
3.
On the next rise of the liquid level, the other pump will start
on the lead pump ON signal. The pumps will continue to
alternate their cycles.
Note:
The ON/OFF float switch differential should be set as to
not exceed 12 starts per hour.
4.
If the liquid level rises to the lag pump ON float, the second
pump will start. Both pumps will run until the liquid falls
below the pump OFF float, emptying the basin.
5.
In the event of a malfunctioning float switch, control relay, or
pump, the liquid level rises and tilts the HIGH LEVEL ALARM
float. The alarm system will activate.
K001316
RISK OF ELECTRIC SHOCK
