EBARA BSP SS Operating And Maintenance Manual page 13

9. MAINTENANCE AND REPAIRS
We recommend periodically checking that the pump is working correct-
ly; pay particular attention to any abnormal noise or vibration and, for
surface pumps, any mechanical seal leaks.
The main and most common special maintenance operations are gen-
erally as follows:
a) Replacement of impeller set
b) Replacement of diffuser set
c) Replacement of coupling & shaft
d) Replacement of bearing set
e) Replacement of thrust bearing set
f) Replacement of mechanical seal
g) Replacement of radial bearing set
h) Replacement of membrane
After start using the pump, a maintenance card should be opened to
the pump.
Pump's voltage, current, flow rate and pressure values should be
saved periodically in every 3 months. By comparing these values be-
tween each other and with the nominal values, pump's condition can
be understood.
As soon as there are sudden deviations or steadily decrease / increase
in these values, you should call competent distributor.
There is no problem about making the submersible pumps wait without
starting it. However, it must be worked once in a month to prevent
possible jamming in the pump.
Control panel of submersible pump should be cleaned from dust and
moisture by Monthly periods. In every 6 months, equipments and cable
connections of the control panel should be checked and loosen ones
should be tightened.
9.1. TROUBLESHOOTING
Pump's Discharge Pressure is not Enough
Too low water level in borehole.
Pressure switch is set up wrong
or failured.
There is leakage at the instal-
lation.
Pump is worn out.
Pump impeller's is chocked up.
Thermal Protection System is Running
Motor absorbs excessive
amount of current.
Pump is jammed.
Motor is broken.
Settings of thermal relay or
selection of relay is wrong.
Motor runs on two phases.
Increase the installation depth of
the pump and close the valve to
decrease flow rate.
Check if pressure switch is wor-
king properly and set up right.
Check the entire installation and
repair it if that exists.
Pull out the pump and replace
worn out parts and get in touch
with the service.
Pull out the pump and check it.
Stop the motor quickly and get in
touch with the service.
Pull out the pump and send it to
the service.
Pull out the pump and check if
motor has any failures and send
it to the service.
Check the thermal relay and its
settings.
Check power phases. fuses and
cable connections.
Frequent Starts and Stops
Liquid level electrodes are too Distance between two electrodes
close to each other. must be at least 3 meters. Lower
30 cm up from pump discharge.
Pump Runs Noisy and Vibrating
Pump equipments are
partly/completely blocked.
There is excessive amount of air
or gas in the water of the well.
Motor's axial thrust bearing is
broken. the axial thrust bearing of motor.
Selected pump is not suitable
for this application.
Pump's bearings are worn out.
Fixing of the installation is weak.
Duty point is out of pump's Close the valve to decrease the
characteristic curve.
Pump Does not Run
No electricity supply.
The fuses are blown.
The dry-running protection has
cut off the electricity supply to
the pump, due to low water
level.
Control Panel Runs Noisy
Contactor's circuits are worn Check the circuits of the contactor,
out. have them repaired or replaced.
Motor doesn't start
No power or incorrect voltage Check voltage at lines. Contact
Fuses blown or circuit breakers
tripped
Control box malfunction
Defective wiring
Bound pump Pull pump and correct problem.
Defective cable or motor
Motor start too often
Check valve stuck open
Waterlogged tank
Leak in system
electrode should be installed
Pull out the pump and have it
repaired.
Fluid must be processed to
have air or gas out of it.
Pull out the pump and replace
Pull out the pump and install a
suitable pump for the appli-
cation.
Replace the pump's bearings.
Check the installation.
flow rate to make the pump to
work at duty point.
Contact the electricity supply
authorities.
Replace the blown fuses with
the new ones.
Check the water level.
power company if voltage is
incorrect
Replace with proper fuse or
reset circuit breakers
Repair or replace
Correct faulty wiring or con-
nections
Run new installation until the
water cleans
Repair or replace
Replace if defective
Repair or replace
Replace damaged pipes or
repair leaks
EN
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