Troubleshooting Table - Franklin Electric VR Serie Manual Del Propietário

TROUBLESHOOTING TABLE

Before any intervention, disconnect the pump
from the power supply.
Fault
7.1 The motor does not run when
started.
7.2 The thermal protection of the
motor starter trips at start.
7.3 The thermal protection of the
motor starter trips now and then.
7.4 The flow rate is not constant.
7.5 The pump rotates but does not
supply water.
7.6 The pump vibrates.
12
Cause
a) Lack of power supply.
b) Blown out fuses.
c) Thermal protection tripped.
d) Motor defective.
a) Fault in the contacts of the ther-
mal switch of the motor starter.
b) Connection of the cables faulty.
c) Motor wiring faulty.
d) Mechanical block of the pump.
e) Calibration of the thermal relay
too low.
a) Calibration of the thermal relay
too low.
b) Low voltage during the peaks.
a) Pressure too low during suction
(cavitation).
b) Suction manifold / pump partially
obstructed by impurities.
c) The pump sucks air.
a) Suction manifold / pump partially
obstructed by impurities.
b) Bottom valve or check valve
blocked in closed position.
c) Leak in the suction manifold.
d) Presence of air in the suction
manifold or in the pump.
e) The motor rotates in wrong direc-
tion.
a) Anchoring on the plinth faulty.
b) Foreign body obstructs the pump. Disassemble the pump and clean it.
c) "Hard" rotation of the pump.
d) Electric connection faulty.
Remedy
Connect power supply.
Replace fuses.
Restore the thermal protection.
Replace the motor.
Replace the contacts of the motor
starter.
Tighten or replace the cables.
Replace the motor.
Remove the mechanical pump
block.
Calibrate the motor starter correctly.
Calibrate the motor starter correctly.
Check power supply.
Check the NPSH of the pump.
Clean the pump or the suction mani-
fold.
Check the suction conditions.
Clean the pump or the suction mani-
fold.
Repair the bottom valve or the check
valve.
Repair the suction manifold.
Check the suction conditions.
Change the motor rotation direction.
Verify and completely screw the nuts
of the bolts of the studs.
Verify that the pump rotates freely
without anomalous hindrances.
Verify the connections of the pump.