Target And Seal-In Unit; Pickup And Dropout Test - GE IAC Series Instruction Booklet

Time overcurrent relay
Table of Contents
UNIT RANGE
AMPERES
0.5
2.0
16.0
10.0 -
80.0
20.0
160.0
-

TARGET AND SEAL-IN UNIT

The target and seal- i n unit has
a n d 2. 0 amperes.
screw
i n
the
lower-ampere
holding
the
r i ght-hand
setti ng,
f i rst remove one screw from the le f t hand stat ionary contact
a nd
place
it
in
undes i red tap a nd place it on the le ft hand stationary contact where
the
f irst
screw
necessary
to prevent the
out o f
adjustment.
s ame time.
1.
Con nect
relay
ammeter a n d load box so that the current ca n be controlled over a
ra nge of 0. 1 to 2. 0 amperes.
2.
Turn the t i me d i al to the ZERO ( 0) T IME-D IAL Pos i tion.
3.
Increase the current slowl y until the seal- i n u n i t p i ck s up.
Table X I I.
4.
Move
the
t i me
seal- i n u n i t should rema i n in the p i cked-up pos i tion.
5.
Decrease
the
See Table XII.
GEK-34054
TABLE XI
MINIMUM
AMPERES
4.0
3.6
14.4
72.0
144.0
The relay
is s hipped from the factory with the tap
position.
the
desired
tap.
was
removed.
r ight-ha nd
Screws s hould
studs
1
and
dial
away
f rom
current
slowly
TABLE X I I
PICK-UP
TAP
CURRENT
0.14 - 0.195
0.2
1.40 - 1.95
2.0
CALIBRATION
AMPERES
4.0
16.0
80.0
160.0
an operat i ng coil tapped at 0. 2
The
tap
contact.
Next
remove
2.
See
F i gure
stati onary
contact
never
be lef t in
2
14)
(See
Figure
the
ZERO
T IME-DIAL
unt i l
the
seal- i n
DROPOUT
CURRENT
0.05 OR MORE
0.50 OR MORE
14
MAXIMUM
AMPERES
4.5
17.7
89.0
177.0
screw
is
the
s crew
To
cha nge
the
the
screw
f rom
Th i s
procedure
f rom
gett i ng
both
taps
at the
to
a
DC
source,
Pos i t ion;
u n i t
drops
tap
the
i s
See
the
out.

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