Overload Protection; Wiring Instructions - Liberty Pumps XLE50 Serie Manual De Instalación

Overload Protection

3-phase models require overload protection in accordance with
the control panel instructions. 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 select and adjust 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.
Thermostats
XLE-Series pumps are protected from overheating by thermal
switches (thermostats) located in the motor. For 1-phase models,
a hermetically sealed thermostat is mounted on the motor
windings and wired directly in series with the motor's winding,
interrupting power in a high heat condition. 3-phase models
utilize two thermostats mounted in series directly on the motor
windings, thus monitoring the pump's internal temperatures. The
thermostat circuit must be connected in such a way as to open the
motor contactors in the panel cutting power to the pump in an
overheat condition.
Both 1-phase and 3-phase pumps are designed to operate under
class B insulation with a maximum temperature of 266°F (130°C)
internal temperatures, even though the motors are constructed
with class F materials. Failure to use the proper circuitry and
connection of the thermostat will drop T class to T3 on 3-phase
models.
Many control panels have a manual reset button for the
thermostats on 3-phase models. This button must be pressed to
reset the system after the pump has cooled. 1-phase models
automatically reset after the pump has cooled to a safe
temperature.
Seal Failure Probes
XLE-Series pumps are equipped with two mechanical face seals
with an oil chamber between them to provide permanent
lubrication to the seals. A seal fail or moisture sensing device is
located in the mid oil chamber and continuously monitors for
leakage. Should moisture mix with the oil, an indicator light will
illuminate on the control panel indicating a shaft seal failure has
occurred and the pump is in need of service. The pump will
continue to operate as normal but service should be scheduled as
soon as possible.
Intrinsically safe (ISS and ISD Series) panels by Liberty Pumps have
a seal leak test button that tests the integrity of the seal leak
circuit continuity. When pressed, the light should illuminate. If it
does not, either the light is burned out, the circuitry is open, or the
system does not have power.
The seal leak module is located inside the panel and requires
adjustment upon installation. See Seal leak relay setup on
page 7.
– 6 –
Power and Control Cords
 Do not remove cord and strain relief, and do not connect
The power and control cords cannot be spliced; a junction box
may be used providing it is rated for hazardous locations and has
approved cord connectors.
IMPORTANT: Each cable has a green lead. This is the ground wire
and must be grounded properly per NEC

Wiring Instructions

 Always disconnect pump(s) from power source(s) before
 All installation and maintenance of pumps, controls,
 All electrical and safety practices shall be in accordance with
Copyright © Liberty Pumps, Inc. 2019 All rights reserved.
RISK OF ELECTRIC SHOCK
conduit to pump.
RISK OF ELECTRIC SHOCK
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
protection devices, and general wiring shall be done by
qualified personnel.
the National Electrical Code
Health Administration, or applicable local codes and
ordinances.
NOT SEAL
USED LEAK
* Note: On
1-phase pumps,
the white and
red leads of the
control cord are
CONTROL
not used.
CORD
NOT
USED
SEAL FALURE
PROBES
Figure 1. Wiring Diagram 1-Phase
®
and/or local codes.
®
, the Occupational Safety and
L1 L2/N
RUN
CAP
POWER
CORD
POTTING
RESIN
MOTOR
3473000B