Electric Connection - Pentair STA-RITE Serie Manual De Instrucciones

EN
Before installing the hydraulic unit inside the well, it is necessary to remove all the sand, in accordance with the ordinary procedures
adopted for perforators. SCM 4 PLUS®, SCM 4 HF and SA 6 pumps should never be used without pumping liquid, because the bearings
are lubricated by the liquid itself.
•
The pump can suffer severe damage
if it is operated in dry conditions, even
for short interval of time. The unit
has to be positioned on the bottom
of the well and slightly raised by
approximately 1-2 m, to prevent the
sand surrounding the motor and the
pump and overheating the former and
wearing the rotating parts of the latter
•
Before lowering the pump into the
well, make sure that the supply cable
have been correctly tightened to the
fittings on the control panel and that
the protection relays are suited to the
absorption indicated on the nameplate
•
At this point, disconnect the unit
and start lowering it into the well.
All lowering operations should be
performed using stainless steel or
nylon ropes and the slots provided on
the head of the pump
CHAPTER 6

ELECTRIC CONNECTION

WARNING
Ensure tension and frequency of pump (read plate) and power supply are same.
DANGER - ELECTRIC SHOCK RISK
Installer must make sure that electric current network has ground wire conforming to current laws.
DANGER - ELECTRIC SHOCK RISK
Make sure that electric current network is provided with a high-sensitivity circuit breaker
Δ=30 mA (DIN VDE 0100T739).
WARNING
Before connecting the power supply cord to the clamps on the command panel, make sure that the cord is able
to withstand the nominal current of the unit.
•
Electric connections must be carried
out by skilled staff only, in accordance
with the manufacturer's instructions
enclosed to the electric equipment
and the motor
•
It is advisable to install a protection
device upstream, of adequate
dimensions (in accordance with
the current values indicated on the
nameplate) to prevent voltage peaks
and overloads
12
•
Connect the first pipe section to the
drain mouth of the pump after fixing
the two halves of the supporting rod to
the end of the pipe
•
If threaded pipes are provided, apply
the threaded sleeve to the upper end
to avoid it sliding between the pipe
and the rod
•
Use a hoist to lower the whole unit
into the well
•
Carefully control the free end of the
cable to prevent it falling into the well
•
Connect the second section of the
pipe, that is coupled to the upper
supporting rod, remove the previous
rod and lower the whole unit into
the well
•
Repeat this operation until the desired
project depth has been reached
•
Take into account that the machine
must be positioned at 1-2 m below the
dynamic level or, at any rate, at a depth
that meets the pump NPSH
•
Cables should be selected in function
of the absorption in Ampere, indicated
on the nameplate
•
Cables should be dimensioned in
accordance to the power to transmit,
of the distance from the control
page and the starting system of the
submersed motor
•
Cables should guarantee a submersed
operation, have waterproof joints and
show no signs of abrasions or holes
•
Before positioning the pump, it is
necessary to take into account the
lowering of the water level, that can
originate from seasonal factors or
from an excessive stratum extraction
•
The well level should never fall below
the suction chamber to avoid gripping
the guide bushings and overheating
the motor
•
The power cable should be fixed with
straps every 2-3 m of pipe
•
Cables should be safely anchored to
the riser to prevent lowering caused
by weight
•
These movements could cause
deformations owed to the striking
against the walls of the well and
ruptures of the cables
•
If the riser is formed by threaded tube
sections, it is necessary to tighten the
latter to prevent them coming loose
due to the machine reaction torque
•
The control board should be equipped
with all the protection devices and
equipment to manage and drive the
hydraulic unit
•
More specifically, it is necessary
to guarantee a protection against
overcurrent and short circuits
•
Protections against the loss of phases,
the lowering of voltage and the lack of
water in the well are recommended but
not compulsory