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9(Xl-
129
(Revised
7-69)
SUPPLEI'IE}ITA
RY IITSTRUCTI
S
These instructions epply
to the motor operated circuit
breaker
transfer switches
for the following
load
trans-
fer
controls:
LTC
800',LTC
1200 through
Spec C and
LTC 2000
th'rough
Spec
B
(Manual
#959-3); LTD
800
through
Spec
C
(Manual
#972-L).
The
load transfer
controls
are
housed
in
two separate
cabinets, or
cubicles.
The
larger
cabinet contains the
motor
operated
transfet switch mechanism
and rofl-outo-
matic circuit breakers. The
small
cabinet contains
control
components such
as relays, battery charger,
and other optional equipment which are
all
covered
in
the applicable
Instruction Manual.
DESCRIPTION
(S00
A
1200
Arnp
Series)
The motor-operated
circuit
breakers, one on line
side
and one on
generator
side,
are
electrically
operated
to
open
or close.
Each
one is controlled by
contact-making
devices outside
the breaker
and
motor mechanism,
and
performs
its
function by means of a
motor
moving
the
circuit
breaker
handle with
the
aid
of worm
gear,
crank,
operating
rod
and
handle attachment.
The motor
operated
mechanism consists
of a motor,
single speed
reduction
means, a crank, a
limit switch,
a centrifugal
brake, a housing for mounting the
parts
just
mentioned,
Etr operating
arm,
a
breaker handle
attachment,
and
an
emergency handle. The speed re-
duction
is
made between
the motor and the crank by a
hardened
steel worm
coupled
directly
to
the
motor shaft
and
a bronze
worm
gear
coupled to the crank shaft.
The motor,
gear
and
worm have
packed
ball
bearings
containing
sufficient
lubricant
to last
thtoughout the
life of
the
apparatus. The
operating rod
is
the
mechani-
cal
link
between
the
crank
and
the
handle
attachment.
It
is
ptovided
with
a
compression spring
to absorb
any
variations between or in these
two
parts.
The handle
attachment
is
fastened
to the breaker
handle and
has
a
clutch which either connects
the operating rod
mechani-
cally to the breaker
handle, or disconnects
the
operating
rod when the
emergency handle is
inserted.
On
the
800
ampere seties,.the
handle attachment is
fastened to
the
breaker handle and
has a clutch
which either connects
the operating rod mechanically
to the breaker
handle
or
disconnects the operating tod
when the handle is
pulled
out.
On
the
1200
ampere series,
the operating
rod is also the mechanical link
between
the
crank
and
the
handle attachment.
The
motor is
of
the
series commutator type and
operates on
a.c.
The limit
switch
opens
the motor circuit as soon
as
the
breaker
closes or opens in response to
a corre-
sponding
contact
in
the
control
circuit. This
switch
is a
rotary
type
with two
segments, one for closing ancl
one
for opening.
,.r- ..
The
centrif ugal
brake, consisting
of two
weights
spun
against
a
brake
band
by
the
motor shaft,
limits
the
speed of the motor and
prevents
overtravel of
the motor
mechanism.
lrnportont:
Ifris motoropetated
breaker
has
been
a&
justed
at
the
lactory
tot
prcper
'opetation.
Do
not
dismantle or chan(e the rclative
position
oI
any of the
parfs,
since
this
may
a|Iect
the opetation
and
tedace
the lite
of
the appatatus.
Lugs
on
the neutral bar
for
the
800
series will
accom-
modate
two
3/0 to
500
MCM
size
wires.
The
other
connecting
lugs
(cre per pole)
accommodate two
3/0
to
600 MCM
size
wires.
The
1200
ampere series
have
lugs on
the neutral bar
for
three
300
to
500 MCM
size
wires. Four
300
to
500 MCM
size
wires can
be
connect-
ed with the
other
lugs
(one
per pole).
0perotion
Designed for intermittent operation,
the
high
torque
operating motor has the same
direction
of rotation for
closing and opening and should
not
be
put
through
mote than
10
complete closing
and opening
operations
immediately following
one
another. The number of
operations is not limited if
the
rate
of operation is
nd
greater
than
four per
minute.
After
the control
contacts close,
the
circuit breaker
motor
is
started and rotates
the crank
180
o.
A motor
cut-off
switch
then
opens
the
circuit to stop
the
motor
and closes
a contact to rotate
the
crank
another
180
o.
This
opens
the circuit breaker
when the opening
con-
trol contact is
mad6.
|tANUAt
0PERATI0N
(800
Anp)
Tum the single-pole
toggle switch
by
the transfer
switch
to the
open
or
off
position.
If the
particular'
model doesntt
have a
toggle switch,
disBonneot
the
jumper
between
terminals
6
and
8.
Then
pull
out the
knurled
handle to
disconnect
the motor
mechanism
from the
breaker
handle.
To change back
to automatic operation,
return
the
breakers
to their original
positions,
latch
handles
and
close the
disconnect switch
or
connect
the
jumper.
ITANUAL
0PERATION
(1200
Arnp)
Turn
the
single-pole
toggle
switch by the transfer
switch to
the open
or off
position.
If
the
particular
model doesn't
have a
toggle
switch, disconnect
the
jumper
between
terminals
6
and
8.
Screw the
emer-
gency
handle
into
the end of
the operating
lever
until
the
handle
can
no
longer be
turned.
This will
lift a
roller
out
of a notch
in the
lever which
is operated
by
the motor
crank
and
will disconnect
the
operating
-i
yl
*-"
--r
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