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GEEP-124-I Horizontal Induction Motor

WPI, Antifriction Bearing

Wiring and Grounding

WARNING

: MOTOR AND CONTROL WIRING,

OVERLOAD PROTECTION AND GROUNDING
SHOULD BE IN ACCORDANCE WITH THE
NATIONAL ELECTRICAL CODE AND
CONSISTENT WITH SOUND LOCAL
PRACTICES.
FAILURE TO OBSERVE THESE CAUTIONS
MAY RESULT IN DAMAGE TO THE
EQUIPMENT, INJURY TO PERSONNEL, OR
BOTH.

Power connections

The stator winding is terminated in the power

terminal box. Connections to the stator wiring should be
made in accordance with the stator connection diagram
for the machine or with the connection diagram shown
on the main nameplate. The stator is wound to produce
clockwise rotation, facing opposite drive and when the
phase sequence of the applied voltage is T1, T2, and T3
(i.e. when the phases of the supply voltage connected to
the power leads reach positive maximum in that time
order.). The direction of rotation can be changed by
reversing any two of the connections. However, the
machine should always rotate clockwise viewed from the
opposite drive and unless it was specifically sold for
opposite or dual rotation, since the fans, or other
devices, may be directional. Machines Furnished with a
single direction of rotation have an arrow on the drive
end. If the owner desires to operate the motor in opposite
standard rotation, first check the factory for suitability
through the nearest General Electric office.

Before any electrical connections are made

between the machine and the owner’s power or
accessory cable or wire, it is desirable to check the
insulation resistance of the winding to determine if the
winding is sufficiently dry for safe operation. See the
section entitled Insulation Resistance on page 15. This
check may prevent having to break the electrical
connections later.

The stator winding leads are terminated with

connectors for bolting to corresponding connectors on
the cable from the owner’s power supply. The bolted
connections should be adequately insulated, phase-to-
phase and to ground.

The rotor winding of wound-rotor induction

motors is terminated on the collector rings. External
connections to the brush rigging should be made in
accordance with the rotor connection diagram for the
machine or with the connection diagram supplied on the
inside of the collector cover. The rotor-winding amperes
at rated horsepower with the slip rings shorted (i.e., no
external impedance in the rotor circuit), is shown on the
nameplate as Secondary Amperes. The ring-to-ring
voltage of the rotor winding at locked rotor, is shown on
the motor nameplate as Secondary Volts. Note that the
machine should not be plugged for braking or other
reasons, by control external to the motor unless the
machine has been ordered as suitable for such duty.
Plugging will increase the ring-to-ring voltage to twice
that on the nameplate. Therefore, the rotor insulation
must be designed for this higher level. Questions
concerning this should be referred to the nearest General
Electric office. Care should be taken to assure that
insulation containing silicon is not used for the
secondary conductors. A small amount of silicon in the
area will greatly accelerate brush wear.