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Flanges should be provided with suited slots
to accommodate the wires.
During the assembling use a suspension ring
fastened to the column pipe, to avoid
dropping the pump in the well in case of hoist
failure or chain breaking
.
7. ELECTRICAL
INSTALLATION
ATTENTION!
ALWAYS RESPECT THE SAFETY
REGULATIONS!!
Electrical installation must be carried out by an
expert, authorised electrician, who takes on all
responsibility.
Attenersi scrupolosamente alle istruzioni del
costruttore del motore e delle apparecchiature
elettriche.
THE SYSTEM MUST BE
CORRECTLY AND SAFELY
EARTHED!!
Always switch off the mains power supply before
working on the electrical or mechanical part of the
system and make sure it cannot be switched on
again accidentally.
–
We recommend to install upstream the motor a
safety switch to protect the motor against voltage
drop or overload.
–
Refer to voltage data on motor nameplate for its
correct sizing.
–
Leave 2 or 3 meters of cable more in case the
terminal connection should be changed.
7.1 Power supply cable connection
The supply cable should be selected according to the
Ampere flow, showed on motor nameplate.
If the cable is not supplied with the motor, it should
suit the following requirement:
a)
Its section should correspond to the one
recommended by the motor manufacturer
according to carried power, installation depth
and motor starting system
.
b) Warranty required: up to 600V in water.
c) Motor connection should be performed with
extreme care.
d) The cable should show no cuts, cracks, scratches
or other damages.
If two cables have to be joined in parallel, pay extreme
attention when connecting cables of the same color.
7.2 Electric system
The motor is connected by the supply cable to the control
panel which contains the necessary control and protection
devices. Since every difficulty, either mechanical or
electric, will damage almost automatically the motor
windings, it is necessary for the control and protection
equipment to be adequate and reliable. Economy may, in
this case, produce unpleasant results. We recommend
besides an efficient grounding of the control panel
.
7.3 Electric protections
In all case of:
–
DOL
starting,
–
Star/ Delta starting,
–
Stator
starting,
–
Autotrasformer,
Are necessary:
–
An
overload
protection.
–
A short circuit protection.
such protections should trip on all three phases.
We suggest besides protections against:
–
Phase
drop.
–
Voltage
drop.
–
Water level drop.
7.4 Rotation direction
Check motor rotation direction before coupling the motor
to the pump, so to avoid any damage to motor thrust
bearing.
Find and mark by means of cyclic
phase indicator, whose pointer is turning
clockwise, mains terminals L1, L2 and L3
and connect them to control panel
terminals L1, L2 and L3.
Star/delta starting
Motor cables are marked with
letters U1-V1-W1 and U2-V2-
W2.
They have to be
connected to control panel
terminals, respectively: U1-
V1- W1 and U2-V2-W2
for
clockwise
rotation
(seen from motor/pump
coupling)
.
In case of counterclockwise
rotation, reverse terminals U1-
V1 and U2- W2.
Electropumps turning in a counter-
clockwise direction viewed from the
delivery mouth
Electropumps turning in a clockwise
direction viewed from the delivery
Connection
Electrical
equipment
