GE AK-50 - Undervoltage Tripping Device Adjustments and Replacement; Undervoltage Device Adjustments; Undervoltage Device Replacement; Tripping Device Coil Replacement

Low
-
voltago
Powor
Circuit
Broakon
G
El
-
74600
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zz
23
-
V
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14
19
4
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15
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-
3
LiTK
,
2
16
I
\
17
%
i
1
.
Magnet
2
.
Pal let
3
.
Pinion
4
.
Escape
Wheel
5
.
Driv i n g
Seg m ent
6
.
S
.
T
.
D
.
Le ve r
7
.
S
.
T
.
D
.
Cali br at io n
Spri n g
8
.
T
rip
A
rm
9
.
Trip
Paddle
10
.
Trip
Paddle
Adjusting
Screw
11
.
L
.
T
.
D
.
Lev er
13
.
L
.
T
.
D
.
Cal ibr ati on
Spri n g
14
.
Spr ing
Holde r
15
.
Calib r a tion
Clam p
Nut
16
.
Cylinder
17
.
Fra me
18
.
S
.
T
.
D
,
Armature
25
.
Armature
Adjust i n g
Scr e w
19
.
L
.
T
.
D
.
Arm a tur e
20
.
Sto p
Pin
21
.
Cou nt er
Wei ght
22
.
Magn e t
23
.
Pole
Unit
24
.
Con nec tin g
Rods
12
.
Ins t
.
Trip
Spr ing
(
High
Set
)
Fig
.
22
.
Direchoding
hipping
device
—
EC
-
J
DIRECT
-
ACTING
TRIPPING
DEVICE
EC
-
1
(
Fig
.
22
)
(
USED
ON
AK
-
1
-
75
AND
AK
-
1
-
100
)
3
.
Remove
the
screws
which
secure
the device
to
the
breaker
pole
unit base
.
The device is
now
free
.
netic
force
produced
by
an
overcurrent
condition
overcomes
this
restraining
force
,
the
armature
movement
is
fur
-
ther
retarded
by
an
escapement
mecha
-
nism
,
which
produces
an
inverse time
delay
characteristic
.
LONG
TIME
-
DELAY
TRIPPING
(
FI
®
.
22
)
The
armature
(
19
)
is
restrained
by
a
calibrating spring
.
After
the
mag
-
netic
force
produced
by
an
overcurrent
condition
overcomes
this
restraining
force
,
the
armature movement
is
fur
-
ther retarded
by
the
flow
of
silicone
oil
in
a
cylinder
(
16
)
.
This
mechanism
produces
an
inverse time
delay
char
-
acteristic
.
4
.
Remove
magnet
(
22
)
and
arma
-
ture
assemblies
(
18
)
and
(
19
)
by
remov
-
ing
screws
which
secure
the
assem
-
blies
to
the lower
stud
.
The direct
-
acting
overcurrent
trip
-
ping
device
causes
the breaker
to
open
within
a
predetermined
time
range
,
depending
on
the
magnitude
of
the
over
-
current
.
This
device
can
be
provided
with
the
following tripping
combina
-
tions
:
5
.
Follow
the
above
procedure
in
the
reverse
order and
adjust
the device
as
described below
under
ADJUSTME
NTS
.
ADJUSTMENTS
(
Fig
.
22
)
1
.
Long
time
delay
,
short
time
de
-
lay
and
instantaneous
tripping
.
1
.
The
air
gaps
between
magnet
(
22
)
and
armatures
(
18
)
and
(
19
)
are
set
by
adjusting
screws
(
25
)
.
When
replacing
the device
refer
to
the
drawing
which
accompanies
each
new
device
for
spe
-
cific
gap
dimensions
.
The
gap
dimen
-
sion is
measured
from
the
magnet
to
the
armature
at
the
point
where
the
gap
is
largest
.
Tighten
the
locking
nuts
on
adjusting
screws
(
25
)
after
setting
proper
air
gaps
.
2
.
Long
time
and short
time
delay
tripping
only
.
INSTANTANEOUS
TRIPPING
(
Fig
.
22
)
3
.
Long
time
delay
and
instantane
-
ous
tripping
.
1
.
Adjustable
instantaneous
tripping
is
similar
to
long
time
delay
tripping
,
except
that
the
long
time
delay
escape
-
ment
mechanism is
removed
to
elimi
-
nate
the
intentional
time
delay
.
2
.
Nonadjustable
instantaneous
trip
-
ping
is
accomplished
when
the
mag
-
netic
force
overcomes
the
force
of
a
heavy restraining spring
(
12
)
connected
between
the
armature
and the
support
fastened
to
the
frame of
the device
.
4
.
Short
time
delay
and
instantane
-
ous
tripping
.
5
.
Short
time
delay
tripping
only
.
2
.
With
the
air
gap
set
as
in
item
1
,
and the
armatures
(
18
)
and
(
19
)
resting
against
the
adjusting
screws
(
25
)
,
move
the crank
,
which attaches
to
the
con
-
necting
rods
(
24
)
,
toward the
front of
the
device
.
Adjust
the
connecting
rods
(
24
)
to
the
proper
length
by turning
them
in
the
clevis
which attaches
them
to
the
crank
.
Connecting
rod
pins
should be
in
the
right
-
hand direction
(
facing
the back
of
the breaker
)
,
before
attaching
the
tru
-
arc
retainers
for
4000
-
ampere
frame
size
.
Position
should
be
opposite
for
3000
-
ampere
6
.
Instantaneous
tripping
only
:
adjustable
(
Low
Set
)
or
non
-
adjustable
(
High
Set
)
The short
time
delay
and
long
time
delay
armatures
for
the
AK
-
1
-
75
-
1
are
located
as
shown
in
Fig
.
22
,
but
their
positions
are
reversed
for
the
AK
-
1
-
100
-
1
.
SHORT
TIME
-
DELAY
TRIPPING
(
Fig
.
22
)
The
armature
(
18
)
is
restrained
by
REPLACEMENT
(
Fig
.
22
)
1
.
Remove
the
front frame
(
see
SEPARATION OF FRONT
AND
REAR
FRAMES
under
MAINTENANCE
)
.
2
.
Remove
retainers
and
pins
from
/
l
\
A
\
_
1
11
-
A
fi
—
—
Courtesy of NationalSwitchgear.com