5595000B
Copyright © Liberty Pumps, Inc. 2022 All rights reserved.
5 | EN
Thermostats
1-phase LGH02/LGV02-Series grinder pumps are equipped with
hermetically sealed, direct-acting thermal protectors
(thermostats). The protectors are attached to the motor windings
and wired in series with the motor. In the event of an overload or
elevated temperature, the contacts in the protector will open and
disconnect the power to the motor. The protectors will
automatically reset when the motor has cooled to a safe
temperature. The pump will resume operation once the
thermostats automatically reset.
3-phase LGH02/LGV02-Series pumps are not equipped with
thermal protection. Panels used with these pumps must be
equipped with properly sized overload protection.
Overload Protection
3-phase LGH02/LGV02-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.
Power and Control Cords
Do not remove cord and strain relief, and do not connect
conduit to pump.
The power and control cords are field-replaceable Quick-connect
cords. The cords must not be spliced.
IMPORTANT:
Each cord has a green lead. This is the ground wire
and must be grounded properly per NEC
®
and/or local codes.
Wiring Instructions
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code
®
, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
Figure 1. 1-Phase Wiring Diagram
Figure 2. 3-Phase Wiring Connections
Table 1. 1-Phase Control Panel Components
Component and Specification
Liberty Pumps P/N
200V 1-phase Start Kit
(contains 3 items listed separately below)
K001640
Start Capacitor, 270–324 µF 220/250 VAC
Run Capacitor, 65 µF 370 VAC
Start Relay
230V 1-phase Start Kit
(contains 3 items listed separately below)
K001641
Start Capacitor, 270–324 µF 220/250 VAC
Run Capacitor, 50 µF 370 VAC
Start Relay
RISK OF ELECTRIC SHOCK
RISK OF ELECTRIC SHOCK
Pump P
ower Leads
Black (2)
Red (8)
Green (Gnd)
White (7)
Start Cap
Run Cap
Start Relay
L1
L2
5
1
2
L3
L2
L1
BLK
PNK
VIO
RED
WHT
BLU
BRN
ORN
YEL
440–480V 3PH
L3
L2
L1
BLK
PNK
VIO
575V 3PH
BLK
PNK
VIO
RED
WHT
BLU
BRN
ORN
YEL
L3
L2
L1
208–230V 3PH
