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01.4IB.46300
Equipment Description
Ch 3 Equipment Description
a. g
eneral
Portions of the following text have been taken
from Eaton Instructional Leaflet IB-48041,
effective December 2009.
FlexTrol
™
is designed to comply with applicable
NEMA ICS Standards Publications and UL 347.
These controllers are described as
metal-enclosed, high-interrupting capacity
motor starter equipment with manual isolation.
Each controller and starter is designed for
specific applications and the components and
functions are determined by the purchaser’s
specifications and needs
.
Starting, stopping, and overload protection
are essential control functions for all types of
Alternating Current (AC) motors. Short-circuit
protection is a basic function included in
FlexTrol. Additionally, a large variety of
protective devices and functions can be
included in each controller depending on the
particular application and the type of motor
being controlled, such as synchronous or
wound-rotor motors.
These instructions are prepared as a general
guide that provides the necessary general
information for the FlexTrol type and function.
These instructions also include a suggested
method of installation with demonstrative
techniques for the operation and maintenance
of the equipment. Separate instructions
covering particular equipment, devices, or
components are not included in this instruction
bulletin, but are available upon request. The
purchaser should interpret these instructions
for applicability to his particular controller by
referring to the drawings supplied with the
controller.
The basic FlexTrol is an assembly of
components and conductors for motor
starting, arranged for convenient access in an
enclosure which allows space and facilities for
cable termination, with safety interlocking of
the doors and isolator to prevent inadvertent
entrance to high voltage parts. This equipment
is rated 7200 volts maximum and may be
used on distribution voltages from 2400 to
7200 volts. Installation, operation, and service
should be performed only by experienced
personnel trained and qualified in this class of
equipment.
B. F
lex
t
rol
™
c
lass
e2 M
eDiuM
v
oltage
c
ontroller
In general, FlexTrol consists of one-high or
two-high vertical sections of medium voltage
compartments. Each FlexTrol consists of a high
voltage and low voltage compartment. Also,
each compartment has a separate door and
barriers between the two compartments.
The controller consists of a non-load break
isolation switch, medium voltage current
limiting fuses, one or more Type SL
vacuum-break contactors, a set of current
transformers, plus control and protection
devices. The isolating switch has a limited
transformer magnetizing currents. The
controller is designed to start, stop, and
protect a three-phase medium voltage motor.
The controller may also be used to switch
transformer windings or capacitor loads.
For applications other than those indicated,
consult Powell. Each controller occupies all
or a portion of a steel structure that may also
enclose a horizontal bus system to distribute
power to two or more sections and a vertical
bus system to connect individual starters to the
horizontal bus.
