EBARA EVMS 1 Operating And Maintenance Manual page 17

WARNING!
Motor-driven pumps not equipped with a plug must be
powered by connecting them permanently to the electrical
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 pump does not have an internal motor protector, there-
fore overload protection must be provided by the user.
From 1.5 kW to 45 kW, the motor is equipped with a PTC. It
is recommended to connect the protection to an electronic
board.
WHILE CONNECTING, MAKE SURE THAT BOTH THE TERMINAL BOARD AND
THE MOTOR DO NOT GET WET.
– 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 EVMS
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 breaker);
- 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, it is
necessary to remove the 4 screws holding the motor to the motor mount, lift the
engine just enough to allow rotation, without removing the coupling between the
motor shaft and the 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 disconnected.
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
WATER. 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) 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 7.2.;
e) during power cuts, it is advisable to disconnect the power to the pump.
f) select the pump so that it will operate close to the best efficiency point, at
least between minimum and maximum rated flow rate.
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 levels 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 suction 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
[-C-]
with the isolating valve open is almost always a result of motor system problems
of an electrical or mechanical nature or, much more commonly, 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.
For more information on the factors that reduce and/or compromise suction lift
and hence the pump's performance, see the troubleshooting section in chap. 14.
Note that for temperatures and altitudes higher than those specified, the motor's
output is reduced and you will need to have a motor with greater output or is
necessary to reduced the request motor's performance. See chap. 15.2 on the
subject. Make sure there is no water hammer or pressure peaks in the system
caused by fast-closing valves exceeding 1.5 times the pump's nominal pressure.
In the long run, they can cause damage to the actual pump. Avoid operating the
pump with the isolating valve on the delivery line closed for any more than a few
seconds. You should also avoid using the pump for continuous duty with a flow
rate below the minimum rate indicated on the rating plate as this may result in
the liquid being pumped overheating and in the unnecessary overloading of
pump or motor bearings.
11.4 STOPPING
a) Gradually interrupt water circulation in the delivery section to avoid
[-D-]
EN
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