10
ELECTRICAL CONNECTIONS
All electrical work must be carried out under the super-
vision of an authorized electrician.
Local codes and regulations must be observed.
Check that the voltage and frequency on the data
plate agree with your actual power supply.
The motor can´t be connected for different voltages.
If intermittent operation is prescribed (see data plate),
the mixer should be provided with control equipment
that provides such operation.
To avoid leakage into the mixer check:
— that the cable entry seal sleeve and washers con-
form to the outside diameter of the cable. See the
parts list.
— that the outer sheath on the cable is not damaged.
When refitting a cable which has been used before,
always cut off a short piece of the cable so that the
cable entry sleeve does not compress the cable at
the same point again.
Remember that the starting surge can be up to 3.5
times higher than the rated current. Make sure that the
fuses or circuit breakers are of the proper amperage.
The table (see “Product Description”) gives rated cur-
rent and starting current. Fuse amperage and cable
must be selected in accordance with local rules and
regulations.
The overload protection (motor protection breaker)
shall be set to the motor’s rated current as given on
the data plate. With a clockwise phase sequence
L1-L2-L3 (R-S-T), the propeller will rotate correctly,
i.e. clockwise as viewed from the motor side. Check
the phase sequence in the main (line) using a phase
sequence indicator.
Three thermal contacts are incorporated in the stator
and are normally closed. The thermal contacts can be
connected to maximum of 250 volts, breaking at 4
amps. current at maximum.
Connect the thermal contacts to the starter.
Motor cable
CAUTION!
If the machine is intended for use with a
Variable Frequency Drive (VFD), be careful in
choosing a motor cable. The VFD might require
a screened cable.
Please, read the manufacturer’s instruction for
the VFD.
If necessary, contact your ITT Flygt represen-
tative.
Available motor cable are SUBCAB®,SUBCAB®AWG
or a chemically resistant cable e.g. HCR.
Connect the motor cable to the terminal board as
illustrated in the figure “Direct on-line start”.
Connect the leads from the motor control circuit to T1
and T2.
Tighten the screws so that the cable entry unit forms
an effective seal.
Connect the motor cable to the starter equipment.
Check the direction of rotation, see “Before starting”.
If the direction of rotation is wrong, transpose two of
the phase leads, only for 3 phase.
For 1 phase mixers rotating in wrong direction, please
contact your nearest Flygt reprensative.
NOTE! With long cables, the voltage drop must
be taken into consideration, since the motor’s
rated voltage is the voltage measured at the
terminal board in the machine.
NOTE! For safety reasons, the earth
lead should be longer than the phase
leads. If the motor cable is jerked
loose by mistake, the earth lead
should be the last to come loose
from its terminal. This applies to
both ends of the cable.
Make sure that the mixer is
correctly earthed (grounded).
WARNING!
If persons are likely to come into
physical contact with the machine or
mixed media (liquid) the earthed
(grounded) socket must have an
additional earth-(ground-)fault
protection device (GFI) connected.
Ex version!
Electrical connection of the explo-
sion-proof mixer must be performed
by authorized personnel.
Before starting work on the machine,
make sure that the machine is
insulated from the power supply
and cannot be energized.
Flygt disclaims all responsibility for
work done by untrained, unautho-
rized personnel.
Thermal contacts must always be
used on Ex-approved machine due
to approval conditions.
