EBARA EVM Series, Operating And Maintenance Manual, Page: 17 / 96

17
EN
9. ELECTRICAL CONNECTION
− ELECTRICAL CONNECTION MUST BE CARRIED OUT BY A QUALIFIED
ENGINEER.
− IT IS ADVISABLE TO INSTALL A HIGH INTENSITY DIFFERENTIAL
SWITCH (0.03 A) ON BOTH THE THREEPHASE AND SINGLE PHASE
VERSIONS.
WARNING!
Motor-driven pumps not equipped with a plug must be
powered by connecting them permanently to the electri-
cal cabinet equipped with a switch, fuses and thermal
cut-out calibrated to the pump’s absorbed current.
The mains must be reliably earthed, according to the
electrical regulations in force in the user’s country: this
is the installer’s responsibility.
If the motor-driven pump is supplied without a power
cable, use a cable that complies with the regulations in
force and the necessary section according to length,
power and mains voltage.
If present, the plug of the single phase version must be
connected to the mains far from sprays, water jets or
rain and it must be accessible.
The three phase version does not have an internal motor
protector, therefore overload protection must be provi-
ded by the user. From 1.5 kW to 11 kW, the engine is
equipped with a PTC suitably connected to an electronic
card.
WHILE CONNECTING, MAKE SURE THAT BOTH THE TERMINAL BOARD AND
THE MOTOR DO NOT GET WET.
– Connection of the single phase versions must be made on the basis of
whether thermoamperometric protection “P” is internal or external.
– For threephase versions, after connecting the star or triangle 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.
MOTOR-DRIVEN EVM series
Before starting to make electrical connections, make sure that line voltage
and frequency match the motor’s values given on the rating plate.
You must insert a control panel between the line and the motor-driven
pump featuring the following devices (unless otherwise specified by local
standards);
- Switch with at least a 3mm gap between contacts;
- Short-circuit protection device (fuse or thermomagnetic circuit break -
er);
- High-sensitivity (0.03 A) residual current circuit breaker;
- We recommend installing a device to protect against dry running, which
must be connected to a float, sensors or other such equipment;
Connect the protective conductor to the PE terminal first, leaving it longer
than the others so that it will be the last wire to be pulled out if accidentally
tugged.
If the terminal box is in an awkward position for connecting the cable, you
can change its position by turning the motor 90° or 180° or 270°. To do
this, you will need to remove the 4 screws fastening the motor to the sleeve,
lift the motor just enough to allow rotation, without removing the coupling
between the motor shaft and pump shaft. Then screw the 4 screws back in.
10. FILLING THE PUMP
WARNING!
Do not start the pump until it has been positioned and
installed in its final place of operation to be performed
with the motor’s terminal strip fully closed
The pump and suction line must be filled with water. As specified earlier,
running the pump without water inevitably causes serious damage to a
number of the pump’s internal parts.
Fill the pump with the terminal box closed and the power supply discon -
nected.
10.1. FILLING PUMP IN SUCTION LIFT ARRANGEMENT
a) Unscrew the hexagonal cap located above the outer jacket on a level
with the upper mount (remove coupling covers if necessary);
b) With the aid of a funnel, fill the suction line and pump casing with water
to overflowing;
c) Screw the hexagonal cap back on until it is locked tight;
d) Areas that have become wet as a result of water leaks must be dried
thoroughly;
e) Refit the coupling covers if they have been removed;
10.2 FILLING PUMP IN A FLOODED INSTALLATION
a) Unscrew the hexagonal cap;
b) Open the suction gate valve until the water comes out;
c) Screw the cap back on until it is locked tight. Starting and operation;
11. USE, STARTING AND RUNNING
NEVER ALLOW THE MOTOR-DRIVEN PUMP TO OPERATE WITHOUT WA -
TER. DOING SO CAN SERIOUSLY DAMAGE THE INTERNAL COMPONENTS.
11.1. 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 (check the
maximum number in Chap. 7.2);
e) during power cuts, it is advisable to disconnect the power to the pump.
11.2 STARTING
Once the unit has been hooked up electrically and to the water circuit and
charged with water, check its direction of rotation before using it.
a) Start the electric pump with the delivery valve closed.
b) Check that the motor rotates clockwise (starting from the fan end - the
direction is also marked by an arrow on the top mount) by looking
through the slots in the fan cover. This is best seen when starting or
stopping the motor.
c) If it is rotating in the wrong direction (counterclockwise), shut off power
and swap two of the motor’s power phases in the electrical enclosure
or terminal block.
d) Start the pump two or three times to check system conditions;
e) restrict the delivery to cause a rapid pressure increase for a few times;
f) make sure that the noise, vibration, pressure and electrical voltage lev -
els are normal.
g) while driving loosen the vent cap until the water comes out; screw the
cap back on until it is locked tight.
11.3. RUNNING
Start the pump with the isolating valve on the delivery line closed, then
open it gradually. The pump must operate smoothly and quietly. Close the
isolating valve again and make sure that the reading on the delivery line’s
pressure gauge is close to the Hmax value as indicated on the rating plate.
(This approximation is mainly attributable to tolerances and to possible suc -
tion lift). If the pressure gauge reading is much lower than Hmax, repeat
filling (air in pump).
If the two values are close, it means the pump is working properly and any
trouble with the isolating valve open is almost always a result of motor sys -
tem problems of an electrical or mechanical nature or, much more com -
monly, of pump cavitation due to:
– excessive difference in height or excessive pressure loss along suction
line,
– delivery line backpressure too low;
– problems associated with liquid temperature.
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