caprari HVX Serie Betriebs- Und Wartungsanleitung Seite 14

HVX - HVXS
5.5 Electrical connections and information
The electrical connections must be made by qualified 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.
GB
Electrical equipment
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.
ATTENTION The contacts of undersized or poor quality electrical equipment will quickly deteriorate. The motor power supply will
consequently become unbalanced and could damage the motor itself.
Unless it is correctly researched and implemented, use of the INVERTER and SOFT-STARTER can damage the
pumping unit. Ask for assistance from the Caprari Technical Departments if the relative difficulties are not
known.
Installation of good quality electrical equipment will ensure reliable and safe operation. Check that it is equipped with all
components required for correct and safe use of the product (eg. main isolator, quick-tripping relay with manual reset at
compensated ambient temperature, etc.).
Delta connection
W2 U2 (X)
(Z)
U1 (U) V1
(V)
L1 (R) L2 (S)
Power supply voltage
ATTENTION Check that the voltage and frequency values with which the motor is rated correspond to those of the electricity main, according
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 (for threephase motors)
ATTENTION A wrong rotation direction could damage the motor since in this case, the power draw and axial thrust of the pump will be much
higher than those forecast.
Check the exact rotation direction (anticlockwise for the pump viewed from the coupling side or for the motor viewed from the
fan side) by proceeding with the following operations:
1) fill 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.
W2(Z) U2 (X)
U1 (U)
V1(V)
L2 (S)
Phase unbalance
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.
1 4
Star connection
V2
(Y)
W1 (W)
U1 (U)
L3 (T)
V2(Y)
W1 (W)
L1 (R)
W2 U2 (X) V2
(Z) (Y)
V1 W1 (W)
(V)
L1 (R) L2 (S) L3 (T)
For single-phase motors
In case of single-phase feeding, the correct sense of ratation is set in the
factory (anticlockwise for the pump viewed from the coupling side or for
the motor viewed from the fan side).
In any case refer to the drawing in the motor terminal board.
Starting Y / ∆
The short circuit conncting links are
connected with the corresponding
motor terminals.
Caprari S.p.A.