3473000C
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
5 | EN
Pump System Components
Control Panel
Float switches must be connected to an intrinsically safe
circuit in the control panel as per the requirements of
Chapter 5 of the National Electric Code®.
XLE-Series pumps require a separate, approved pump control
device or panel for automatic operation. Operation 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.
The control panel shall be installed outside the hazardous area
and appropriately isolated and sealed to prevent any potential
ignition or explosion. Only approved controls that have
intrinsically safe float switch connections shall be used. 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 XLE-Series pump to an
existing control panel, verify the panel is correctly sized and
equipped for the pump.
3-phase models require overload elements selected or adjusted in
accordance with the control instructions. The control panel shall
have provisions for the thermostat that open the motor
contactors. Do not exceed voltage/current combinations for the
thermostat: 16 Vdc/20 Amps, 115 Vac/22 Amps, 277 Vac/8 Amps,
and 600 Vac/4 Amps. All models have a surface temperature (T)
class rating of T4; however, if thermostat is not connected on
3-phase models, the T class drops to T3.
Intrinsically safe control panels designed for use with the
XLE-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.
1-phase pumps require a panel-mounted run capacitor. Refer to
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.
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.
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.
RISK OF SERIOUS INJURY OR DEATH
Table 1. Capacitor Kits
Model
Run Capacitor
Capacitor Kit
XLE51
45 µF 370 VAC
K001514
XLE52
30 µF 370 VAC
K001513
XLE71
45 µF 370 VAC
K001514
XLE72
30 µF 370 VAC
K001513
XLE102
40 µF 370 VAC
K001585
XLE152
40 µF 370 VAC
K001585
Table 2. Seal Fail Replacement Relay
Description
Relay
Input
Voltage
Liberty
Pumps
P/N
Macromatic
P/N
Simplex, controls
1 pump
120V
K001672
SFP120A250
240V
K001673
SFP240A250
Duplex, controls
2 pumps
120V
K001675
SFP120C250
240V
K001676
SFP240C250
