Use And Starting; General Warnings; Maintenance And Repairs - EBARA OPTIMA Gebrauchs- Und Instandhaltungshandbuch

9. USE AND STARTING

NEVER ALLOW THE MOTOR-DRIVEN PUMP TO OPERATE WITHOUT WA-
TER. DOING SO CAN SERIOUSLY DAMAGE THE INTERNAL COMPONENTS.

9.1. GENERAL WARNINGS

a) Our surface pumps are designed to operate at a temperature
no higher than 40°C and a level no higher than 1000 metres;
b) our motor-driven pumps cannot be used in swimming pools or
similar plants;
c) prolonged motor pump operation with the delivery pipe closed
can cause damage;
d) avoid switching the motor pump on and off too frequently
GB
(check the maximum number in FIG. 8);
e) during power cuts, it is advisable to disconnect the power to
the pump.
9.2. STARTING
a) Start the pump two or three times to check system conditions;
b) restrict the delivery to cause a rapid pressure increase for a
few times;
c) make sure that the noise, vibration, pressure and electrical
voltage levels are normal.
9.3. STOPPING
a) Gradually interrupt water circulation in the delivery section to
avoid overpressure in the piping and pump caused by water
hammering;
b) switch off the main switch.

10. MAINTENANCE AND REPAIRS

We recommend periodically checking that the pump is working
correctly; pay particular attention to any abnormal noise or vibra-
tion and, for surface pumps, any mechanical seal leaks.
The main and most common special maintenance operations
are generally as follows:
replacement of mechanical seals
replacement of grommets
replacement of bearings
replacement of capacitors.
When the SURFACE pump remains inactive for a long period, it
should be emptied completely, removing the discharge and Þ lling
caps, washed carefully with clean water then emptied. Do not
leave water deposits inside. This operation must always be car-
ried out whenever there is a chance of frost in order to avoid the
breakdown of the pump components.
If the power cord needs changing on submersible pumps, this must
be done by an assistance centre only.
10.1. TROUBLESHOOTING
DISPLAYED FAULT
No electricity
Plug not inserted
THE PUMP DOES
Incorrect electrical
NOT WORK
connection
The motor does
not turn Automatic switch
triggered or fuses
blown
Float sticking
Thermal protection
activated
(single phase)
8
CAUSE SOLUTION
Check the
electrical
supply meter
Check the
connection to the
power supply
Check the terminal
board and the elec-
trical panel
Reset the switch or
replace the fuses and
verify the cause
Check that the ß oat
reaches the level ON
It reactivates
automatically
(single phase only)
DISPLAYED FAULT CAUSE
Decrease in the
line voltage
Suction Þ lter /
hole blocked
Foot valve
THE PUMP DOES
blocked
NOT WORK
The motor turns
Pump not
primed
Pressure
too low
System
undersized
System dirty
Water level
too low
THE PUMP
Incorrect rotational
WORKS
direction
with a reduced
(threephase only)
ß ow rate
Incorrect supply
voltage
Leaks from piping
Pressure too high
THE PUMP STOPS
Liquid temperature
AFTER WORKING
too high
FOR BRIEF
PERIODS
Thermal protection
Internal fault
intervention
The difference
THE PUMP STOPS
between
AFTER WORKING
maximum and
FOR BRIEF PERIODS
minimum pressure
Pressure
is minimal
applications
THE PUMP DOES NOT
Maximum
STOP
pressure too high
Pressure applications
Flow rate too high
Cavitation
Irregular piping
THE PUMP
VIBRATES
Or is too noisy Noisy bearing
during operation
Foreign bodies
sliding along the
motor fan
Incorrect priming
SOLUTION
Wait for voltage to
return to normal
Clean the
Þ lter / hole
Clean the valve and
check its operation
Prime the pump
Check any delivery
non-return valves
Check the liquid
level
Restrict the
delivery gate
Re-examine
the system
Clean the piping,
valves, Þ lters
Switch off the
pump or immerse
the foot valve
Invert the two
phases
Supply the pump
with the voltage in-
dicated on the ate
Check the joints
Recheck the
system
The temperature
exceeds the
technical limits of
the pump
Contact the nearest
retailer
Increase the differ-
ence between the
two pressures
Set maximum
pressure at a
lower value
Reduce the
ß ow rate
Contact the nearest
retailer
Fix in a better way
Contact the nearest
retailer
Remove the foreign
bodies
Bleed the pump
and/or Þ ll it again