Liberty Pumps LGV Serie Manual De Instalación página 10

Troubleshooting
Problem
Pump does not start.
Pump does not deliver proper
capacity.
Pump runs but does not turn off.
Pump operates with selector
switch in Hand position but does
not operate in Auto position.
10 | EN
Table 3. Troubleshooting Matrix
Possible Cause
Control panel selector switch in Off position.
Blown control circuit transformer fuse.
Tripped circuit breaker, blown fuse, or other
interruption of power.
Improper voltage.
Float switch is unable to move to the PUMP ON
position due to interference in basin or other
obstruction.
Insufficient liquid level.
Defective float switch.
Obstructed impeller or volute.
Loose wiring connections.
Thermal overload tripped.
Discharge gate valve partially closed or clogged.
Check valve partially clogged.
Incorrect motor rotation.
Low liquid level.
Obstruction in pump or piping.
Total head (lift height) is beyond pump's
capability.
Pump is airlocked.
Float switch unable to move to the PUMP OFF
position due to interference with the side of
basin or other obstacle.
Control panel selector switch in Hand position.
Control panel failure.
Defective float switch.
Control circuits malfunctioning.
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Corrective Action
Set selector switch to Hand or Auto position.
Replace fuse.
Reset tripped circuit breaker; replace blown fuse
with properly sized fuse; investigate power
interruption.
Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Position the pump or float switch so that it has
adequate clearance for free movement.
Verify the liquid level is allowed to rise enough
to activate float switch(es).
Replace float switch.
Remove obstruction.
Check and tighten all connections.
Wait for pump to cool to operating temperature.
Check the discharge line for foreign material,
including ice if the discharge line passes through
or into cold areas.
Raise liquid level up and down to clear; remove
check valve to remove obstruction.
1-phase: verify capacitor wiring in Figure 1, else
consult factory.
3-phase: correct pump rotation direction. Refer
to section 3-Phase Pump Rotation
Verification.
Check liquid level.
Remove obstruction.
Route discharge piping to a lower level. If not
possible, a larger pump may be required.
Consult Liberty Pumps.
Turn pump off and let set for several minutes,
then restart.
Position the pump or float switch so that it has
adequate clearance for free movement.
Set selector switch to Auto position.
Check control panel.
Replace float switch.
Check float switch, level control or alternator
relay for issues. Replace as necessary.
Check control panel.
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