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Fig. 6
A
P1max
P1max + P2max ≤ PN
Std. Pump
B
P2max
P1max
P1max + P2max + P3max ≤ PN
9.5 Electrical connections
ATTENTION!!
ALWAYS OBSERVE THE SAFETY
REGULATIONS!!
Electrical installation must be carried out by an
authorised, skilled electrician who assumes all
responsability.
THE SYSTEM MUST BE
CORRECTLY AND SAFELY
EARTHED!!
Scrupulously follow the wiring diagrams inside
the terminal board box and those on table C, pag.
131.
Ensure that the mains voltage is the same as that
shown on the motor data plate.
The pumps must always be connected to an
external switch.
Three-phase motors must be protected with an
automatic switch (e.g. circuit breaker) calibrated at
the values shown on the data plate of the
electropump.
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. (see table B,pag.130 ).
In NKV elecropumps the terminal
board may face in four different
positions: slacken and remove the four
retaining screws between the motor
flange and the support. Turn the motor
into the desired position and replace the
screws.
Std. Pump
P2max
HP Pump
P3max
ENGLISH
9.6 Starting
Before starting the pump and the
suction pipe have to be properly
primed pump and pipe have to be fully
filled with clean water.
Starting NKV
In accordance with accident-prevention
regulations, the pump must be run only if
the coupling (where provided) is suitably
protected. So the pump must be started
only after having checked that the coupling
protections are correctly fitted .
To obtain priming, proceed as follows:
KVC – KVCX (Fig.7) :
After having removed the cap, fill the pump slowly
through the filling hole so as to discharge any air
pockets present inside.
NKV (Fig.8) :
Before filling the pump through the filling hole you
must first partially unscrew the drainage pin/cap
(when filling just unscrew it by 3 or 4 turns) without
forcing it.
After having removed the cap, fill the pump slowly
through the filling hole so as to discharge any air
pockets present inside.
Before starting the pump, close the filling cap and
screw the drainage pin/cap all the way, without
forcing it.
Vent by means of the screw on the part opposite the
filling cap, as indicated in Fig. 8.
Fully open the gate valve on intake and keep the
one on delivery almost closed.
Switch on and check that the direction of rotation is
correct, as indicated in Fig. 2. If not, invert any two
phase leads, after having disconnected the pump
from the power mains.
Once the hydraulic circuit has been completely filled
with liquid, gradually open the delivery gate valve
until its maximum opening.
With the pump running, check the supply voltage at
the motor terminals, which must not differ from the
rated value by +/- 5%.
With the unit at regular running speed, check that
the current absorbed by the motor does not exceed
the value on the data plate.
21
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