Maintenance And Troubleshooting - Liberty Pumps LGV Serie Manual De Instalación

3. Turn on breakers.
4. Test each pump separately in Hand mode and observe
operation. If 3-phase pump is noisy or vibrates, rotation is
wrong. Refer to 3-Phase Pump Rotation Verification.
5. Set H-O-A switch(es) to AUTO position and allow water to rise
in basin until one pump starts. Allow pump to operate until
the level drops to turn-off point.
6. Allow basin level to rise to start other pump(s). Notice run
lights in panel. Pumps should alternate on each successive
cycle of operation.
7. Turn H-O-A switch(es) to OFF position and allow basin to fill
to the override (alarm) control level(s).
8. Observe all floats in operation to verify that there is adequate
clearance to the surrounds to ensure that the floats do not
have the opportunity to get hung up in their travel.
9. Verify alarm system response.
10. Turn switch(es) to AUTO position; pumps should start and
operate together until level drops to turn-off point.
11. Repeat this operation and cycle several times before leaving
the site.
12. Check voltage when pumps are operating and record the
amp draw of each pump. Check amps on each wire as
sometimes a high leg will exist. For excessive voltage on one
leg, the electric utility company shall be consulted.
13. Complete Startup Report.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.

Maintenance and Troubleshooting

RISK OF ELECTRIC SHOCK
 Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
 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.
RISK OF SERIOUS INJURY OR DEATH
 Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
 Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Additional Warning for Hazardous Locations
 Use only non-sparking tools and components in and around
basins, open covers and vents. Do not use electronic devices
that are not rated for use in hazardous locations or have live,
exposed electrical circuits in or around basins, open covers
and vents. Sewage and effluent systems produce and may
contain flammable and explosive gases and sparks could
ignite these gases.
7550000F
 All electrical and motor repairs and service must be
 Power and control cords are not field-replaceable unless
 Replacement impellers must match the part number of
 Verify correct 3-phase pump rotation before returning to
Maintenance
As the motor is oil-filled, no lubrication or other maintenance is
required. If ordinary location pumps require replacement
lubrication, use ISO VG 10 turbine oil. Contact the factory for
proper replacement procedure. For Hazardous Location pumps,
removing any oil plugs needs to be done by someone who is
certified to work on Explosion Proof motors.
Severe operating environments will require more frequent checks.
For any issues that are not resolvable, contact Liberty Pumps for
further assistance.
Monthly
Pumps that are idle for more than a month in a dry basin should
have impellers manually operated through the breaker panel
monthly to lubricate the upper (inner) and lower (outer) seals.
Pumps that are idle in a wet basin must be removed.
Quarterly
1.
2.
3.
4.
5.
Annually
1.
Field Service on Hazardous Location Pumps
The only allowable repairs/replacements without compromising
the hazardous location rating of the pump are: Quick-connect
cords, lower (outer) shaft seals, volute, and impeller components.
Otherwise, the pump must be returned to Liberty Pumps or an
authorized repair facility for electrical and motor service. This will
ensure the integrity of the hazardous location rating of the pump
and comply with Liberty Pumps warranty requirements.
Copyright © Liberty Pumps, Inc. 2020 All rights reserved.
performed by a repair facility approved by Liberty Pumps and
certified to work on explosion-proof motor enclosures.
Liberty Pumps Quick-connect cords are used. Refer to the
Service Manual for Quick-connect cord replacement
instructions. Service for damaged power or control cords
must be performed by the factory or a repair facility approved
by Liberty Pumps and certified to work on explosion-proof
motor enclosures.
original impeller installed from the factory. Do not trim
impellers without consulting the factory.
service.
Check pumps for corrosion and wear.
Check for free and unobstructed float switch operation and
float switch condition.
Inspect for proper check valve operation.
For multiple pumps, check for balanced operating times.
Uneven times indicate a defective unit, float switch or control.
Inspect the control panel for any presence of moisture in
enclosure, loose connections, and general component
condition.
Basin should be inspected and cleaned. Replace any defective
components.
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