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8.
ELECTRICAL CONNECTION
Caution! always follow the safety regulations.
8.1
The electrical connections must be made exclusively by skilled personnel (see point 6.1) as
required by the safety regulations in force.
The requirements of the electric energy supply company must be scrupulously complied
with.
In the case of three-phase motors with star-delta start, ensure that the switch-over time from star to
delta is as short as possible and that it falls within table 8.1 on page 109.
In particular the earth terminal must be connected to the yellow/green lead of the power cable.
The earth lead used must be longer than the phase leads so that it does not disconnect first when
subject to traction.
8.2
Before opening the terminal board and working on the pump, ensure that the power has been
switched off
8.3
Check the mains voltage before making any connection. If it is the same as the voltage on the data
plate, proceed to connect the wires to the terminal board, giving priority to the earth lead. (Fig.
D).
8.4
ENSURE THAT THE EARTH SYSTEM IS EFFICIENT AND THAT THERE IS THE
POSSIBILITY OF MAKING A GOOD CONNECTION.
8.5
The pumps must always be connected to an external switch.
8.6
Three-phase motors must be protected with special remote-control motor-protectors calibrated for
the current shown on the plate or with fuses of the size indicated in chapter 4.
9.
STARTING UP
9.1
Before starting up, check that the pump is properly primed; fill it completely with clean water by
means of the hole provided after having removed the filler cap on the discharge body. This
ensures that the mechanical seal is well lubricated and that the pump immediately starts to work
regularly. (Fig. E). The filler cap must then be put back in place. Dry operation causes
irreparable damage to the mechanical seal and the stuffing box seal.
9.2
Fully open the gate valve on intake and keep the one on delivery almost closed.
9.3
Switch on the power and check that the motor is turning in the right direction, that is clockwise
when viewed from the fan side, Fig. F (indicated also by the arrow on the fan cover). Otherwise
invert any two phase leads, after having disconnected the pump from the mains.
9.4
Once the hydraulic circuit has been completely filled with liquid, gradually open the delivery gate
valve until its maximum opening.
9.5
With the pump running, check the supply voltage at the motor terminals, which must not differ
from the rated value by +/- 5% (Fig. G).
9.6
With the unit at regular running speed, check that the current absorbed by the motor does not
exceed the value on the data plate.
10.
STOPPING
10.1
Close the interception device on the delivery pipe. If there is a check device on the delivery pipe,
the interception valve on the delivery side may remain open as long as there is back.
For a long period of inactivity, close the interception device on the intake pipe and, if supplied, all
the auxiliary control connections.
11.
PRECAUTIONS
11.1
The electropump should not be started an excessive number of times in one hour. The maximum
admissible value is as follows:
THREE-PHASE MOTORS UP TO 5.5 HP
THREE-PHASE MOTORS FROM 7.5 TO 60 HP
Scrupulously follow the wiring diagrams inside the terminal
board box and those on page 1 of this manual.
Do not start the pump unless it has been completely filled with
fluid.
TYPE OF PUMP
ENGLISH
MAXIMUM NUMBER OF STARTS PER HOUR
24
30
5 - 10
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