Electrical Connection; Motor Connection; Time Relay Adjustment; Rotation Direction. Check - KSB AU Manuel D'instructions

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 and the factory plate, 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

Time 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.
Time relay adjustment in the star-delta connection:
Motor power
≤ 30 kW
> 30 kW
5.4.3

Rotation direction. Check

Check the motor rotation direction by starting
Note
up and immediately shutting down.
rotation direction must correspond with that shown by the
pump arrow located on the pump casing or support. If the
rotation direction is not correct, any two phases L1, L2 or L3 of
the power cable must be inverted in the motor terminal box.
The incorrect rotation of the pump may lead to the incorrect
operation of the seal and the heating of its faces. For this
reason, correct rotation direction must be ensured using the
arrow shown on the pump, with the pump completely filled
with liquid and properly vented.
5.5

Non electric motors

Shall fulfil all that may be applicable to non electric material
and follow the instructions stated in their specific instructions
manual.
Likewise in the case of internal combustion engine refer to the
instructions of the engine manual for recommendations for
safe gas exhaust and air supply required in the installation
room.
6

Start-up

Before starting up, both the pump and the mechanical seal
process pipes, where appropriate, must be completely filled
with liquid.
It is necessary to prevent the formation of explosive
atmosphere within the frame and the seal housing. Although
there are interior evacuation conducts which remove the
possibility of the air becoming blocked, it is necessary to fully
vent the pump and its process pipes, when fitted, before
starting up.
Start-up shall be carried out when all the necessary
mechanical, hydraulic, electrical and pneumatic connections
are complete. The coupling guard must as well be in place
and firmly secured.
AU
Time adjustment -Y
< 3 sec.
< 5 sec.
The
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