Wiring And Grounding - GE Custom 8000 Instructions Manual

DLCGEEP-124-I/000, Approved, 2016-11-11, CampinasDM

Wiring and Grounding

WARNING: MOTOR AND CONTROL WIRING,
OVERLOAD PROTECTION AND GROUNDING
SHOULD BE IN ACCORDANCE WITH THE
NATIONAL ELECTRICAL
CONSISTENT
PRACTICES.
FAILURE TO OBSERVE THESE CAUTIONS
MAY RESULT
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.
GE Industrial Control Systems GEEP-124-I
CODE AND
WITH SOUND LOCAL
IN DAMAGE TO THE
GEEP-124-I Horizontal Induction Motor
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.
Accessory connections
Depending
furnished, (see outline nameplate) the machine may
include any of the following accessories:
• Stator
detectors, 2 per phase
• Bearing resistance temperature detectors.
• Copper-constantan bearing thermocouples
• Bearing temperature readout capability
• Bearing temperature alarm and shutdown
contact capability
• Space heaters, with either 220C or 120C
maximum surface temperature
• Stator winding thermostat
Copyright 1997,1998 The General Electric Company, USA
WPI, Antifriction Bearing
upon the specific equipment
winding resistance temperature
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