GEK-45375
With
•he tap block
set
for the lowest tap
and
the time dial
set
where
contacts are
just
open,
adjust
tk~
control spring to
just
close the contacts within the
limits
given
below
which
are plus
and
minus
1%
of the tap
amps,
See
Table 12.
o"
TABLE
12
§
P
Rang_:_~_Ta_p_-1-_M_i,n.
Amps
-~.
Amps
.
. 5-4
i 0. 5 .495 .
505
--r-·
0-12.0 1.0 .99
1.01
·---~
------------'
It
should never
be
necessary to
wind
up
the control spring
adjuster
more
th.an
30
degrees (one notch)
or
unwind
it
more
than
120
degrees (three notches)
from
the factory
setting
to obtain the
above
pickup
setting.
Time
Tests
With
the tap block
set
for
the lowest tap
and
the time dial
at
No.
5 sett·ing, apply
five
times tap
current to the
relay.
Adjust the position of the drag
magnet
assembly to obta'in
an
operating time
as
listed
in Table 13.
Relay
Time
(Seconds)
Min.
Max.
lT
l
~
IFC51
1.80
IFC53
l •
29
I
l.u
!FC77
I
0.90 i 0.94
However,
it
would
be
preferable to adjust the operating time
as
near
as
possible to 1.78,
1.31
or
0.92 seconds.
The
drag
magnet
assembly should
be
approximately in the middle
of
its
travel.
The
drag
magnet
assembly
is
adjusted
by
loosening the
two
screws securing
it
to the support
structure.
See
Figure 1.
Moving
the drag
magnet
towards the disk!
and
shaft
decreases the operating time
and
moving
the drag
magnet
away
from
the disk,
and
shaft
increases the operating time.
The
screws securing the
drag
magnet
assembly to the support
structure
must
be
tight
before proceeding with
other
tfme
checks.
Jl1ECHANICAL
ADJUSTMENT
The
disk
does
not
have
to
be
in the exact center
of
either
air
gap
for the relay to perform
correctly.
Should
the disk not
clear
all
gaps, the following adjustment can
be
made.
1 ,
Oetermi
ne
which
way
the disk
must
be
a 1 i
gned
to cl
ear
a
11
gap
surfaces
by
0.
O'\O
·inch.
(.
,i,
11
,
2.
Remove
the drag
magnet
assembly
by
loosening the
two
screws securing
it
to the support
structure.
V
The
screws
need
not
be
removed.
3.
Loosen
the upper pivot bearing
set
screw
(l/16
inch
hex
wrench)
slightly,
so
the upper pivot
can
move
freely.
Do
not
remove
the
set
screw
from
the support
structure.
4.
Loosen
the jewel bearing
set
screw
as
in 3 above.
5.
Apply
a
slight
downward
finger pressure
on
the upper pivot
and
turn the jewel bearing screw,
from
the underside of the support
structure,
to
position
the disk
as
determined in l above.
6.
Turn
the jewel bearing screw 1/8 turn clockwise
and
tighten the upper pivot
set
screw to 2.5-3.5
'inch
pounds
of torque.
7.
Turn
the jewel bearing screw 1/8 turn counterclockwise, This
wil'J
lower the disk
and
shaft
as-
sembly
approximately 0.005 inch
and
permit proper end-play,
The
shaft
must
have
0.005-0.010 inch
of end-play.
14
11'1'.'i
~
.
Courtesy of NationalSwitchgear.com
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