Troubleshooting - Franklin Electric BT4 Series Owner's Manual

MAINTENANCE

Troubleshooting

Troubleshooting
Problem
Motor thermal protector
tripped
Open circuit breaker or blown
fuse
Motor Fails to Start or
Not Running Impeller binding
Motor improperly wired
Defective motor
Pump is not primed: air or
gases in pumpage
Discharge or suction plugged
or valve closed
Incorrect rotation (3 Phase
only)
Little or no discharge
Low voltage or phase loss
Impeller worn or plugged
System head too high
Excessive suction lift or losses,
or NPSHA too low for the
pump
Valves in suction or discharge
lines partially closed
Low pump capacity or
Suction or discharge line par-
pressure
tially plugged
Wrong pump rotation
Impeller binding
Discharge head too low creat-
Excessive power con-
ing excessive flow rate
sumption
Fluid viscosity: specific gravity
too high
Impeller binding
Pump is not primed: air or
gases in pumpage
Discharge or suction plugged
or valve closed
Impeller worn or plugged
Excessive noise and
vibration
Excessive suction lift or losses.
NPSHA too low for the pump
Discharge head too low, creat-
ing excessive flow rate
Worn bearing
Pump, motor, or piping loose
Water leakage at pump
Defective seal assembly
shaft
10
Probable Causes Corrective Action
Correct cause for high amperage, such as low voltage or excessive pumping.
Check electric wiring and motor for short circuits and correct.
Remove pump case and check for debris.
Check complete suction line and all fittings for air leaks and verify foot valve
has adequate submergence.
Take to an authorized motor shop for repair or replacement.
Check suction line and foot valve for leaks. Make sure that water level has not
dropped to uncover suction inlet. Prime pump.
Clear obstructions from suction and discharge lines.
Interchange any two of three wires either at the motor or starter.
Correct incoming power to match motor nameplate requirements.
Clean or replace impeller.
Reduce system head (back-pressure on pump) or resize pump.
Locate pump closer to the water source, increase pipe size or resize pump.
Open valves to reduce possible restrictions.
Clear obstructions from discharge line.
Correct to proper rotation.
Remove pump case and check for debris.
Close down discharge valve to increase pressure and throttle back flow rate.
Modify fluid properties or resize pump.
Remove pump case and check for debris.
Check complete suction line and all fittings for air leaks and verify foot valve
has adequate submergence.
Clear obstructions from suction and discharge lines.
Clean or replace impeller.
Locate pump closer to the water source, increase pipe size or resize pump.
Close down discharge valve to increase pressure and throttle back flow rate.
Check bearing for damage and replace if necessary.
Verify all connections and mountings are secure and piping supported.
Replace seal.