6 | EN
Copyright © Liberty Pumps, Inc. 2022 All rights reserved.
7550000G
Overload Protection
LEP-Series 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 available either permanently
potted into the cord cap or field-replaceable Quick-connect cords.
For either option, the cords shall not be spliced.
IMPORTANT:
Each cord has a green lead. This is the ground wire
and shall be grounded properly per NEC and/or local codes.
Seal Failure Probes
Dual seal LEP-Series pumps have a leak detection device mounted
in an oil-filled cavity located between the two mechanical shaft
seals. The device consists of two probes with a 200k
Ω resistor
mounted between them. The circuit can be tested by checking for
continuity between the seal leak wires; refer to the applicable
wiring diagram. If the lower (outer) shaft seal begins to leak and
water migrates into the cavity, it will be detected. Once a shaft seal
failure is detected, the pump will continue to operate but service
should be scheduled as soon as possible.
The LEP-Series control panels by Liberty Pumps have a seal leak
detection system with a test button that monitors the integrity of
the seal leak circuit and components. When pressed, the light
should illuminate. The light should go off when the test button is
released. If it remains on, the potentiometer is set too high. If the
light does not illuminate, the light is burned out, the circuity is
open, or the system does not have power. The seal leak relay
requires adjustment upon installation. See
Seal leak relay setup
on page
10.
Seal fail probes connect to a relay in the control panel, which is
included in a Liberty Pumps control panel. For a non-Liberty
Pumps control panel or for a replacement relay, refer to Table
2.
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.
Permanent Cord 1-Phase Wiring
Pumps manufactured prior to 03/01/2021
RISK OF ELECTRIC SHOCK
Table 2. Seal Fail Replacement Relay
Description
Relay
Input
Voltage
Liberty
Pumps
P/N
Macromatic
P/N
Simplex, controls 1 pump
120V
K001672 SFP120A250
Duplex, controls 2 pumps
120V
K001675 SFP120C250
RISK OF ELECTRIC SHOCK
1
2 3
4
START SWITCH, SINPAC
CONTACTOR
START
CAPS
RUN CAP
15K
2.2K
LINE
MOTOR
SEAL
LEAK
POWER
CORD
CONTROL
CABLE
WHITE
WHITE
GREEN
ORANGE
ORANGE
RED
RED
WHITE
WHITE
BL
UE
WHITE
GREEN
GREEN
BL
A
CK
BL
A
CK
POTTING RESIN
THERMOSTAT
THERMOSTAT
SEAL FAILURE
PROBES
GRAY
GRAY