caprari HV Serie Instrucciones De Servicio página 14

HV - HVS / HVU - HVUS / HF - HFU
The electric pump must be rigidly xed to a strong and stable bearing surface by means of the already made xing holes. Recover any misalignment
between the xing points and bearing surface in order to prevent bending stress from being transmitted to the pump casing:
- use either shims or, in the event of vertical installation;
- adjust the bearing foot of the intake part in the event of horizontal installation.
GB
Connection to the suction and delivery parts is made by means of a ange with standard ori ce (consult chapter 11 "Technical data, dimensions
and weights").
The electrical connections must be made by quali ed personnel in strict compliance with all the accident-prevention regulations and
according to the wiring diagrams enclosed with the control panels. All yellow-green grounding conductors must be connected to the
grounding circuit of the system before the other conductors are connected. The grounding conductors must be the last to be removed
if the motor is disconnected. The free ends of the cables must never be immersed or wetted in any way.
Check that the electric control panel complies with the current accident-prevention standards and provisions. In particular, the
protection level should suit the place of installation. It is advisable to install electrical equipment in dry, well ventilated places. Ambient
temperatures should not be extreme (eg. -20 to +40 °C). Failing this, install a special version of the equipment.
The contacts of undersized or poor quality electrical equipment will quickly deteriorate. The motor power supply will consequently
ATTENTION
become unbalanced and could damage the motor itself.
equipment will ensure reliable and safe operation. All starting equipment must always be equipped with:
1) a main isolator;
2) a fuse holder of adequate size or magnetic protection against short circuits;
3) a quick-tripping threepole contactor with a high cutout power;
4) quick-tripping threepole thermal relay with manual reset at compensated ambient temperature to protect against overloads and phase failure;
- the following items are also recommended -
5) a voltmetric relay to protect against voltage drops;
6) a device to protect against dry operation;
7) a voltmeter and an ammeter.
Delta connection
W2 (Z) U2 (X)
U1 (U)
V1(V)
L1 (R) L2 (S)
Check that the voltage and frequency values with which the motor is rated correspond to those of the electricity main, according
ATTENTION
to whether a star or delta connection is used. Note that a delta connection is always in relation to the lowest value of the two
possible powering voltage values, the opposite being true for star connections. The ratio between the two voltage values is 1,73.
A ± 10% variation to the mains voltage is tolerated for motors with data plate voltage values of 230/400 V or 400/700 V since they can also be
used at voltage values of 220 and 240, 380 and 415 V ± 5%.
Rotation direction
A wrong rotation direction could damage the motor since in this case, the power draw and axial thrust of the pump will be much
ATTENTION
higher than those forecast.
Check the exact rotation direction (clockwise for the pump viewed from the coupling side or for the motor viewed from the fan side) by
proceeding with the following operations:
1) ll the pipe and pump with water (consult the procedure in paragraph 6.1 "Starting");
2) close the delivery sluice valve and allow the electric pump to run for a few seconds;
3) to reverse the rotation direction, disconnect the power supply and invert two of the three phases.
Check the power draw on each phase. Any unbalances should not exceed 5%.
Higher values could be caused by the motor and/or by the electricity main. Check the power draw in the other two motor-main
combinations, making sure that the same rotation direction is maintained. The optimum connection is that with the least difference in
power draw between the phases. Note that if the higher power draw is always on the same line phase, the main cause of unbalance
will be due to the power main.
Star connection
W2 (Z)
V2(Y)
W1 (W)
U1 (U)
(T)
U2 (X)
V2(Y)
W1 (W)
V1(V)
L1 (R) L2 (S) (T)
Installation of good quality electrical
Δ
The short circuit conncting links are
connected with the corresponding mo-
tor terminals.
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