GE IAC

GEK
-
86054
SYSTEM
TEST
Although
this
Instruction
Book
is
primarily
written
to
check
and
set
the
IAC
relay
,
overall
functional
tests
to
check
the
system
operation
are
recommended
at
intervals
based
on
the
customer
'
s
experience
.
SERVICING
TIME
-
OVERCURRENT
UNIT
If
it
is
found
during
installation
or
periodic
testing
that
the
time
-
overcurrent
unit
is
out
of
limits
,
the
unit
may
be
recalibrated
as
follows
:
Pickup
Tests
:
The
pickup
of
the
unit
for
any
current
tap
is
adjusted
by
means
of
a
spring
-
adjusting
ring
.
The
ring
may
be
turned
by
inserting
a
screw
driver
in
the
notches
around
the
edge
.
By
turning
the
ring
,
the
operating
current
of
the
unit
may
be
brought
into
agreement
with
the
tap
setting
employed
if
,
for
some
reason
,
this
adjustment
has
been
disturbed
.
This
adjustment
also
permits
any
desired
setting
intermediate
between
the
various
tap
settings
to
be
obtained
.
The
unit
is
adjusted
at
the
factory
to
close
its
contacts
from
any
time
-
dial
position
at
a
minimum
current
within
five
percent
(
5
%
)
of
the
tap
plug
setting
.
The
unit
resets
at
90
%
of
the
minimum
closing
value
.
Rotate
the
time
dial
to
the
No
.
0
time
-
dial
setting
and
check
,
by
means
of
a
lamp
in
the
circuit
,
that
the
contacts
just
close
.
The
point
at
which
the
contacts
just
close
can
be
adjusted
by
running
the
This
screw
stationary
contact
brush
in
or
out
by
means
of
its
adjusting
screw
,
should
be
held
securely
in
its
support
.
With
the
contacts
just
closing
at
No
.
0
time
-
dial
setting
,
there
should
be
sufficient
gap
between
the
stationary
contact
brush
and
its
metal
backing
strip
to
ensure
approximately
1
/
32
"
wipe
.
Connect
the
operating
-
coil
terminals
to
a
source
of
the
proper
frequency
and
good
wave
form
,
having
a
voltage
of
120
or
more
,
with
pure
resistance
load
boxes
for
setting
the
current
.
See
Test
-
Circuit
Figure
9
.
With
the
tap
plug
in
the
minimum
amp
tap
and
the
time
dial
set
where
contacts
are
just
open
,
adjust
the
control
spring
to
just
close
the
contacts
within
the
limits
given
below
,
which
are
plus
and
minus
2
percent
(
±
2
%
)
of
tap
amps
.
It
should
never
be
necessary
to
wind
up
the
control
-
spring
adjuster
more
than
30
°
(
one
notch
)
or
unwind
it
more
than
90
°
(
three
notches
)
from
the
factory
setting
to
obtain
the
above
pick
up
setting
.
With
the
tap
plug
in
the
minimum
amp
tap
and
the
time
dial
at
No
.
10
time
setting
,
check
the
current
required
to
just
move
the
disk
away
from
the
stop
arm
.
This
current
should
be
within
±
10
%
of
tap
amperes
.
If
the
disk
moves
at
the
lower
limit
,
check
that
the
movement
is
not
over
one
-
half
inch
(
1
/
2
"
)
measured
along
the
perimeter
of
the
disk
.
15
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