Cut Sheet

Volume 10—Enclosed Control CA08100012E—November 2012 www.eaton.com V10-T1-7
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Overview
Enclosed Control Products
Power Supplies
All electrical power supplied as AC or DC—primarily AC—generation, transmission and some distribution
of power at high voltage—most power distribution at use voltage for industrial and residential is 600V and
under—AC power generally at a frequency of 60 Hz—50 and 25 Hz used in some specific areas—AC
distribution at use location single- or three-phase—limited areas have two-phase.
Single-Phase Power Supply
Single-Phase—
two-wire, 120V one line
grounded—120/240V three-
wire center line grounded—
residential distribution,
lighting, heat, fractional
horsepower motors, business
machines.
Three-Phase Power Supply
Three-Phase—three-wire
delta 220/440V, 550V—
four-wire wye 120/208 and
277/480V neutral line
grounded—primary industrial
power distribution—main
motor drives, integral
horsepower motors, lighting,
heating, fractional horsepower
motors, business machines—
used as three-phase or single-
phase power supply.
Squirrel Cage Speed
AC Squirrel Cage Motor—
single- or three-phase—
single-phase requires starting
winding—three-phase self-
starting—stationary stator
winding—no electrical
connection to short circuited
rotor—torque produced from
magnetic reaction of stator
and rotor fields—speed a
function of supply frequency
and number of electrical
poles wound on stator—
considered as constant speed
even though speed
decreases slightly with
increased load—high inrush
currents during starting on full
voltage—rugged
construction—easily serviced
and maintained—high
efficiency—good running
power factor when delivering
full load—requires motor
control only for stator
windings.
Functions of Control
Controller functions to start,
stop, reverse, regulate and
protect connected motor—
when functions do not
include speed regulation,
device is known as a starter
rather than controller—
general applications of
control functions on fans,
pumps, heating and
applications of variable torque
and horsepower where
relatively infrequent cycling is
necessary—functions usually
starting and stopping with or
without motor running
overcurrent protection—
manual or magnetic control—
Commercial and Industrial
control functions for constant
horsepower, constant or
variable torque machine
loads, constant torque metal
working machinery, variable
torque and horsepower fans
and blowers, constant power
heating, lighting, pumps and
motors for all types of
applications—may include
speed regulation—good for
cycling or infrequent starting
and stopping—manual or
magnetic.
Remote and Local Control
Local Control—controlling or
sensing device, master
switch or pilot device
initiating operation located in
same enclosure as controller.
Remote Control—controlling
devices located at some
other point than controller—
may have more than one
operating point with control
devices connected in parallel
or in series, depending on
operating sequence required.
Wiring Diagrams
A symbolic representation of
operation and function of
control devices.
Jogging, Inching, Plugging
Service
Jogging or inching—
momentary operation of
driven machine for small
movement or positioning—
requires non-maintained
operator and electrical control
circuit—control subject to
motor inrush current on each
jog or inch cycle—contactor
derated where the contactor
is opened or closed more than
five times per minute or more
than ten times in a 10-minute
period.
Plugging—plugging stop or
plugging reverse—reverse
power supplied to motor—
motor generates braking—
contactors subjected to
higher than normal motor
inrush during plugging—
requires reversing
contactors—contactor
derated for plugging service.
120V
120V
120V
240V
A
B
A
B
Two-Wire
Three-Wire
N
Three-Wire
Four-Wire
Typical System Voltages
220, 440, 550 or 600V
A
B
C
System 277/480V
Line to Ground 277V
Line to Line 480V
System 120/208V
Line to Ground 120V
Line to Line 208V
A
N
B
C
Current
Speed
100%
0%
L1 L2 L3
T1 T3
T2