RC, RCV
9
Before starting up a new installation, it is necessary to
thoroughly clean the tanks, pipes and accessories by brushing
and blowing. Welding material, scales and other impurities are
often cast off some time after. We recommend using an
oversized sieve filter in suction in order to prevent dirt larger
than that permitted by the pump from coming in.
High suction pressure may overload the bearings and lead to
their overheating. This circumstance must be avoided, to
which end the suction pressure must not exceed that shown in
the data sheet, either through manual control by the operators
or through devices which shutdown the equipment in the event
of excessive pressure.
The pump must not work without liquid under any
circumstance. If this condition may come about, the
installation must be fitted with safety devices which prevent
the operation of the pump without liquid inside, or have
automatic devices to discharge the minimum flow of the pump.
See the section on minimum flow.
5.3.1
Auxiliary connections
The equipment is normally delivered mounted and ready for
immediate operation, with only the hydraulic and exterior
electrical connections being necessary.
When using clean fluids, the cooling of the mechanical seal is
by way of the recirculation of the pumping fluid (it is not
necessary to inject exterior fluid).
Auxiliary pipes are designed exclusively to
support internal stresses due to the pressure
of the circulating fluid, to which end it is forbidden to subject
them to additional exterior stresses (e.g. for support, etc.).
If the pumping liquid is fuel and the leak can lead to
ignition, this contingency should be avoided through
constant control of the seal tightness of the auxiliary pipe
joints by the plant operator.
5.4
Electrical connection:
The electrical connection must be carried out by a
specialist electrician. Applicable regulations must be
complied with.
Check the mains voltage available with the factory plate data
and choose the appropriate connection.
The technical connection conditions and the conditions of the
local energy supply company must be observed when carrying
out the connections.
We strongly recommend the use of a safety circuit breaker for
the motor and a thermistor associated to a trigger device.
These instructions apply to asynchronous three-phase
standard electric motors with a squirrel cage both in horizontal
and vertical execution, in IP-23, IP-54 and IP-55 protection
grades, with frame sizes of between 56L and 355S, both
inclusive, with voltages of 200 to 500 V between phases.
The electric motor as well as whole electric installation shall
accomplish with all safety norms that may be applied to it.
Earthing
Before starting up the pump, the earth of the pump, the
baseplate or the motor must be connected to an effective
earthed point of the installation.
If the baseplate is not within the scope of supply of KSB ITUR,
do not paint either the support surfaces of the pump feet or of
the motor in order to ensure a good conductivity between the
pump and the earth of the electric motor.
5.4.1
Motor connection
Whilst connecting the cables, ensure it is not possible
for voltage to appear.
Check that the earth connection is in line with local
regulations.
The motor may produce a source of ignition or high
temperature in the event of incorrect operation. For
this reason, the motor must be classified with at least the
same type of zone and temperature as the pump. It is
necessary to follow the instructions in the motor manual which
is included with the pump.
Connection in single speed motors
Direct start-up:
In direct start-up the motor can be used in two different
connections:
The voltage and the connection, e.g. 400 VY, 240 VD is
stamped on the motor plate. This means that the motor can
connect at 400 volts in star connection (Y) or at 240 volts in
delta connection (D).
Star connection
Delta connection
Star-delta start-up:
In star-delta start-up, the line voltage must coincide with the
voltage shown on the motor for delta start up (D). The six
terminals indicated in the following diagram will be connected:
Connection to the star-delta contactor
5.4.2
Timer relay adjustment
In the star-delta start-up of three-phase motors, it is necessary
to ensure that the passage from star to delta takes place
quickly. Prolonged time will cause damage to the pump.
Timer relay adjustment in the star-delta connection:
Motor power
Time adjustment -Y
≤ 30 kW
< 3 sec.
> 30 kW
< 5 sec.
Note
