GEK-86105
target is displayed when
the
unit operates.
Pressing
the button in the
lower left
corner of the relay cover resets the
t
a
r
g
et
.
The pickup range
c
a
n
be adjusted continuousl y over
a
four-to-one range by using the
adjustabl e pol e piece.
When the top o f the core is
1
ined up with the calibration
stampings, an approximate val ue of
pickup can be determined.
Dropout
is
a
bo
u
t
40
to
50%
of
p i ckup.
Figure
7
shows the v
a
ri
a
t
i
on of operating time with
applied
current for this
unit.
B
u
r
d
en
data
of
t
h
e
standard unit are tabulated in Table VIII.
TABLE VI II
BURDEN OF STANDARD INSTANTANEOUS UNIT
PICKUP
FREQ
VOLT-
IMPEDANCE
POWER
RANGE
AMPS
AMPS**
FACTOR
0.5 -
2
50
5
310
12.4
0.84
60
5
330
13.2
0.78
1
4
50
5
94
3.75
0.77
60
5
100
4.0
0.71
2
8
50
5
23
0.94
0. 77
60
5
2 5
1.0
0. 71
4
16
50
5
5.8
0.23
o.
77
60
5
6.2
0.25
0.71
10
-
40
50
5
0.9
0.04
0.77
60
5
1.0
0.04
0. 71
20
-
80
50
5
0.23
0.01
0.77
60
5
0.25
0.01
o.
71
40
- 160
50
5
0.07
0.003
0.71
60
5
0.07
0.003
0. 71
**Volt-amperes at
five amps
calculated from input at minimum
pi
c
k
u
p
(12
z).
HIGH DROPOUT INSTANTANEOUS UNIT
The high dropout instantaneous unit is similar to the standard instantaneous unit,
except the dropout current is approximatel y
80
to
90%
of the pickup current.
Refer
to Figure
8,
a photograph of the high dropout unit, for the fol l owing discussion.
The adjustabl e core
(A)
sets the pickup l evel .
Turning the core down (cl ockwise,
top view) l owers the pickup, whil e turning the core up (counterclockwise, top view)
increases
the
pi
c
k
up
.
Before
attempting
to turn the core, the
locknut (B)
must be
loosened.
When l oosening or tightening the l ocknut, the sleeve
(C)
to which the
shading ring
(D)
is attached, must be held to prevent it from turning.
The l ocknut
must be retightened after adjusting the core.
Rotating the shading ring sets the
dropout l evel, thereby determining the quietness of operation when in the picked-up
8
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