Use And Starting; General Warnings; Maintenance And Repairs - EBARA EVM Manual De Uso

gle (FIG. 4) cable to the terminal board, looking at the pump from the
motor side, check that the cooling fan turns in the same way as the
arrow on the label applied on the fan cover. If it is incorrect, swap two of
the three wires over on the motor's terminal strip.
– For applications with inverter use a cable length <25 meters.
SUBMERSIBLE MOTOR-DRIVEN PUMPS
– In single phase versions, plug the unit into the socket.
– For threephase versions (FIG. 5), check that the motor turns in a clock-
EN
wise direction looking at the pump from the top, proceed as follows:
with the motor-driven pump not yet secured to the system, connect the
power cable to the terminal board and switch on briefly; the pump shall
start with a kick in an anti-clockwise direction, seen from the top of the
pump. If the direction is wrong (clockwise), invert two of the three wires
in the terminal board of the electrical panel.
FIG. 7 shows the standard voltages shown on the plate with their respec-
tive tolerances.
8.1. ADJUSTMENTS AND RECORDINGS
In pumps fitted with a float, adjust the length of the float cable with regards
to the minimum and maximum value of the water (see PART 2).
Check that the system automatisms do not require a number of start-ups
higher than the number shown in FIG. 8 for surface pumps and in PART 2
for submersible pumps.

9. USE AND STARTING

NEVER ALLOW THE MOTOR-DRIVEN PUMP TO OPERATE WITH-
OUT WATER. 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 more than 50,000 times a
year. If operate the pump on and off more than 50,000 times per year,
the pump life may be shortened and there is a risk of premature failure.
Regarding the maximum number per hour, please refer also Chapter 8;
e) during power cuts, it is advisable to disconnect the power to the pum;
f) Select the pump so that it will operate close to the best efficiency point,
at least between minimum and maximum rated flow rate.
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 lev-
els 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) Cut off the power supply.

10. MAINTENANCE AND REPAIRS

We recommend periodically checking that the pump is working cor-
rectly; 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:
− 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 filling caps, washed carefully
8
with clean water then emptied. Do not leave water deposits inside. This operation
must always be carried 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 CAUSE
Float sticking
Thermal protection
activated
(single phase)
Incorrect electrical
connection
THE PUMP DOES
Automatic switch
NOT WORK
triggered or fuses
The motor turns
blown
No electricity
Plug not inserted
Decrease in the line
voltage
Suction filter / 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 WORKS
Incorrect rotational
with a reduced flow
direction
rate
(threephase only)
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 PUMP STOPS The difference
AFTER WORKING between
FOR BRIEF PERIODS maximum and min-
Pressure
imum pressure is
applications minimal
SOLUTION
Check that the float
reaches the level ON
It reactivates
automatically
(single phase only)
Check the terminal
board and the electrical
panel
Reset the switch or
replace the fuses and
verify the cause
Check the
electrical
supply meter
Check the
connection to the
power supply
Wait for voltage to
return to normal
Clean the
filter / 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, filters
Switch off the pump or
immerse the foot valve
Invert the two phases
Supply the pump with
the voltage indicated
on the ate
Check the joints
Recheck the system
The temperature ex-
ceeds the
technical limits of the
pump
Contact the nearest
retailer
Increase the difference
between the two
pressures