5459000C
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
7 | EN
3-Phase Pump Rotation Verification
Check 3-phase pumps for correct rotation prior to installing
pump(s) in basin. To change rotation, reverse any two of the
three power leads to the pump (not the ground). Label the
wires for reconnection after installation.
3-phase power uses three separate
alternating currents that peak at
different integrals. With pumps that
are powered by 3-phase electric, the
phase sequence of the motor must
match the phase sequence of the
power source. When the phase
sequences match, the pump operates
properly. However, when the phases
are out of order, the pump runs
backwards (i.e., the impeller rotates in
the wrong direction). This causes an
extreme loss of performance and
could raise the current draw, which
could result in tripping an overload or
circuit breaker.
To ensure that the power to the pump is installed correctly, always
verify proper rotation before lowering it into the sump. If the
pump is rotating in the wrong direction, turn off the power and
reverse any two leads. This reverses the phase sequence and
corrects the pump rotation.
For 3-phase pumps, rotation must be
clockwise when looking from the top of the pump. The correct
direction is also stamped on the bottom of the volute.
Guide Rail System
If guide rails are used, refer to the separate instructions supplied
with the unit for proper installation and operation, making sure all
gaskets and components are present. Contact Liberty Pumps for
available models.
If guide rails are not used, complete all pump-mounted plumbing
at this time, being sure all gaskets and components are present.
Vent
Vent basin in accordance with engineer’s specifications following
all applicable plumbing codes.
Operation
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Starting System
1. Double check all wire connections.
2. Turn pump(s) to OFF position on H-O-A switch.
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.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
Maintenance and Troubleshooting
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.
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.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Replacement impellers must match the part number of
original impeller installed from the factory. Do not trim
impellers without consulting the factory.
Verify correct 3-phase pump rotation before returning to
service.
RISK OF SERIOUS INJURY OR DEATH
Correct Impeller Rotation
BOTTOM
VIEW
TOP
VIEW
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH
