26 l
Installation, operation and maintenance manual – Squirrel cage motor – W Line - Horizontal and vertical 11239449
4.7
ELECTRICAL ASPECTS
4.7.1
Electrical connections
ATTENTION
Analyze the electrical connection diagram
supplied with the motor
carefully before
beginning the connection of the main cables
and those of the accessories. For the
electrical connection of auxiliary equipment,
refer to their specific manuals.
4.7.1.1
Main electrical connections
The locations of power, neutral and rotor terminal boxes
are identified in the specific dimensional drawing of the
motor.
The stator and rotor terminal identifications and their
corresponding connections are indicated in the specific
motor connection diagram.
Make sure the cross section and insulation of the
connection cables are suitable for the motor current and
voltage.
The motor must rotate in the rotation direction specified
on the nameplate and on the sign plate affixed to the
motor.
NOTE
The rotation direction is, by convention,
determined looking to the shaft end at the
motor drive end.
Motors with a single rotation direction must
only rotate in the indicated direction, since
fans and other devices are unidirectional.
In order to operate the motor in the rotation
direction opposite to the specified, consult
WEG.
ATTENTION
Before making the connections between the
motor and the power supply, it is necessary
to perform a careful measurement of the
winding insulation resistance.
In order to connect the motor main power supply cables,
unscrew the cover of the stator terminal box, cut the
sealing rings (standard motors without cable gland)
according to the diameter of the cables to be used and
insert the cables in the sealing rings. Cut the power supply
cables to the necessary length, strip the ends and mount
the cable lugs that will be used.
4.7.1.2
Grounding
The motor frame and the main terminal box must be
grounded before connecting the motor to the supply
system.
Connect the metallic sheath of the cables (if any) to the
common grounding conductor. Cut the grounding
conductor to the proper length and connect it to the
terminal in the terminal box and/or on the frame.
Fasten all connections firmly.
ATTENTION
Do not use washers made of steel or other
materials with low electrical conductivity to
fasten the cable lugs.
