Table of Contents
Advertisement
Power Circui| Breokers,
GEK-731O
-'1
,Lt'7
ill
rill
K
I
g
6
2. Undervoltage
4" Breaker Frarne
5.
Second
Undervoltage
8- Fasteners for Bracket
Accaal'lrr
Buffer
Trip
Paddle
Secorrd
Trip
Paddle
Adjnstrnent Screw
Electrical Interlock
Lever
(Undervoltage
Locko,ut),
Check
Point for Wire
Garrge
q
tz-
I3-
rb.
Fig.
20.
(0108D8126) Underuoltage deuice mounting
voltage
device.
Before disassembling
the original
buffer, carefully
measure
the distance
between the
faces of the threaded members and set
this
dimen-
sion carefully on the new assembly. Refer to
the
breake r
w
ir
ing
diagram
f
or
the
coil
lead
connections.
Adiustment
When
these devices
are installed
or
replaced,
their
positive
ability to
trip
the breaker must
be
demonstrated. This
is
done
on the
shunt
trip
by
placing a l/S?-inch shim
between
the armature
and
magnet
of
the device
and
manually operating
the
armafure to
trip
the
breaker.
If
the
shunt
trip is
not
successfuI
in this
test,
check
the mounting
fastenersto nake sure they are
reasonably
tight.
If
they
are,
then bend the
trip
paddle on
the
trip
shaft
to slightly reduce the dis-
tance between the
trip
arm of
the,
device and
the
trip
paddle, and recheck
for
positive
trip.
If
this
bending
isnecessary,
be
careful
thatit is
not
over-
done.
Undervoltage devices;
trry fte
breaker
when the
urrmature
opens. This
causes; an
extension on the
armature to strike the
paddle on
the
trip shaft.
An
extension on the
other
end
of'the arm,ature (towards
the
front of
the
breaker)
extends:
ttrough
the device
frame
and
limits
tfie
mov.eulentt
of'the
armafure.
23
Advertisement
Table of Contents
