GE IAC User manual

GEK
-
86054
C
INSTRUCTIONS
TYPE
IAC
TIME
OVERCURRENT
RELAYS
TYPES
:
IAC
66
A
IAC
66
B
IAC
66
C
«
u
=
I
.
i
*
•
i
h
%
T
<
5
*
[
•
:
=
GENERAL
ELECTRIC
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GEK
-
86054
CONTENTS
PAGE
DESCRIPTION
APPLICATION
RATINGS
.
3
3
4
INDUCTION
UNIT
STANDARD
INSTANTANEOUS
UNIT
CHARACTERISTICS
INDUCTION
UNIT
STANDARD
INSTANTANEOUS
UNIT
CONSTRUCTION
RECEIVING
,
HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
VISUAL
INSPECTION
MECHANICAL
INSPECTION
ELECTRICAL
TESTS
DRAWOUT
RELAYS
,
GENERAL
POWER
REQUIREMENTS
,
GENERAL
.
.
.
TIME
-
OVERCURRENT
UNIT
Time
Setting
Pickup
Test
Time
Test
INSTANTANEOUS
UNIT
Setting
the
Instantaneous
Unit
Pickup
Test
TARGET
AND
SEAL
-
IN
UNIT
Pickup
and
Dropout
Test
.
.
.
4
5
6
6
8
8
9
9
9
10
10
10
10
11
11
11
12
12
12
12
12
13
13
INSTALLATION
TIME
-
OVERCURRENT
UNIT
TARGET
AND
SEAL
-
IN
UNIT
INSTANTANEOUS
UNIT
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
TIME
-
OVERCURRENT
UNIT
INSTANTANEOUS
UNIT
TARGET
AND
SEAL
-
IN
UNIT
CONTACT
CLEANING
SYSTEM
TEST
SERVICING
TIME
-
OVERCURRENT
UNIT
Pickup
Tests
Time
Tests
INSTANTANEOUS
UNIT
TARGET
AND
SEAL
-
IN
UNIT
RENEWAL
PARTS
LIST
OF
FIGURES
13
13
14
14
14
14
14
14
15
15
15
15
16
16
16
17
18
2
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GEK
-
86054
TIME
OVERCURRENT
RELAYS
TYPES
:
IAC
66
A
,
IAC
66
B
,
IAC
66
C
DESCRIPTION
a
long
time
induction
overcurrent
unit
,
an
The
relays
contain
three
units
:
instantaneous
overcurrent
unit
,
and
a
target
and
seal
-
in
unit
.
APPLICATION
The
IAC
66
A
,
B
,
and
C
relays
are
used
to
protect
a
motor
against
two
abnormal
conditions
.
The
time
induction
overcurrent
unit
(
51
/
TOC
)
protects
against
motor
overloads
.
The
unit
has
a
long
-
time
inverse
characteristic
which
is
designed
to
coordinate
with
the
motor
heating
characteristic
,
coordination
to
insure
against
false
tripping
on
motor
starting
currents
,
and
yet
still
provide
adequate
protection
against
motor
overloads
.
The
usual
setting
for
pickup
is
125
to
150
%
of
the
motor
rating
.
The
instantaneous
overcurrent
unit
(
50
/
I
0
C
-
A
)
provides
fault
protection
,
pickup
of
this
unit
must
be
set
higher
than
the
maximum
momentary
motor
inrush
current
,
with
an
adequate
margin
,
such
as
50
%
or
more
.
Typical
pickup
settings
for
the
two
overcurrent
units
are
as
below
:
Application
requires
The
TABLE
I
PICKUP
SETTING
(
MULTIPLES
OF
MOTOR
FULL
LOAD
CURRENT
)
UNIT
1.15
to
1.4
51
/
TOC
Time
overcurrent
unit
Normal
Dropout
Instanta
-
neous
Overcurrent
Unit
8
to
15
50
/
I
0
C
-
A
The
IAC
66
C
relay
is
similar
to
the
IAC
66
A
and
IAC
66
B
relays
except
that
the
time
unit
and
instantaneous
unit
contacts
are
brought
out
separately
.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
Should
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
’
s
purposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI
,
IEEE
and
NEMA
standards
;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
3
Courtesy of NationalSwitchgear.com

GEK
-
86054
The
internal
connections
are
:
TABLE
II
Drawing
No
.
Figure
Relay
6209658
0257
A
8339
6209961
0285
A
6667
6375694
0285
A
6747
IAC
66
A
IAC
66
A
,
Forms
51
and
up
IAC
66
B
IAC
66
B
,
Forms
51
and
up
IAC
66
C
IAC
66
C
,
Forms
51
and
up
2
A
2
B
3
A
3
B
4
A
4
B
The
outline
and
panel
drilling
dimensions
are
shown
in
Figure
5
.
RATINGS
INDUCTION
UNIT
The
induction
unit
coll
is
available
in
several
ranges
of
pickup
current
.
Table
III
lists
ranges
,
tap
values
,
continuous
-
current
ratings
and
short
time
current
ratings
of
the
induction
unit
coil
.
The
induction
unit
contacts
will
close
30
amperes
for
voltages
not
exceeding
250
volts
.
The
current
carrying
ratings
are
affected
by
the
tap
selected
on
the
target
and
seal
-
1
n
coll
,
as
Indicated
1
n
Table
IV
.
If
the
tripping
current
exceeds
30
amperes
,
use
an
auxiliary
relay
that
is
connected
such
that
the
tripping
current
does
not
pass
through
either
the
contacts
or
the
target
and
seal
-
in
coils
of
the
protective
relay
.
TABLE
III
INDUCTION
UNIT
COIL
RATINGS
(
FORMS
51
AND
UP
)
SHORT
TIME
(
ONE
SECOND
)
RATING
(
AMPS
)
CONTINUOUS
CURRENT
(
AMPS
)
PICKUP
RANGE
(
AMPS
)
TAP
VALUES
(
AMPS
)
75
0.6
,
0.8
,
1.0
,
1.2
,
1.4
,
1.6
,
3
0.6
/
1.8
1.8
200
1.5
,
2
,
2.5
,
3
,
3.5
,
4
,
4.5
1.5
/
4.5
5
300
2.5
,
3
,
3.5
4
,
5
,
6
,
7.5
5
2.5
/
7.5
10
400
4.0
/
12
4
,
5
,
6
,
7
,
8
,
10
,
12
Two
taps
are
required
to
select
pickup
for
IAC
66
relays
having
forms
51
and
up
.
The
two
taps
required
for
the
values
shown
1
n
Table
III
are
(
from
the
lowest
to
highest
pickup
)
:
A
/
L
,
B
/
K
,
C
/
J
,
D
/
H
,
D
/
G
,
E
/
G
and
F
/
G
,
respectively
,
as
labelled
on
4
Courtesy of NationalSwitchgear.com

GEK
-
86054
To
obtain
a
tap
value
of
4.0
amps
on
the
2.5
/
7.5
amp
relay
,
use
taps
the
tap
block
.
D
/
H
.
TABLE
IV
RATINGS OF TARGET
AND
SEAL
-
IN
COIL
DUAL
-
RATED
0
,
2
/
2.0
AMP
0.2
AMP
TAP
2.0
AMP
TAP
CURRENT
OPERATED
(
seconds
)
(
seconds
)
(
amperes
)
(
amperes
)
(
amperes
)
(
ohms
)
(
ohms
)
(
ohms
)
Carry
30
amps
for
Carry
10
amps
for
Carry
continuously
Minimum
operating
Minimum
dropout
DC
resistance
60
hertz
impedance
50
hertz
impedance
2.2
0.05
0.45
2.0
0.37 2.3
2.0
0.2
0.05
0.5
8.3
0.24
0.65
50
42
0.54
STANDARD
INSTANTANEOUS
UNIT
Table
V
lists
the
The instantaneous
unit
is
designed
to
use one
of
several coils
,
pickup
range
,
continuous
current
ratings
and
short
time
rating
of
each
of
these
coils
for forms
1
through
50
.
TABLE
V
STANDARD
INSTANTANEOUS
UNIT
COIL RATINGS
CONTINUOUS
CURRENT
(
AMPS
)
SHORT
TIME
(
ONE
SECOND
)
RATING
(
AMPS
)
PICKUP
RANGE
(
AMPS
)
12
0.5
-
2
0.75
1.5
25
1
4
51
3.0
2
8
127
16
6.0
4
15.0
10
205
40
326
30.0
20
80
326
40
-
160
60.0
5
Courtesy of NationalSwitchgear.com

GEK
-
86054
For
forms
51
and
up
,
the
standard
instantaneous
unit
has
the
following
ratings
,
listed
in
Table
VI
:
TABLE
VI
STANDARD
INSTANTANEOUS
UNIT
COIL
RATINGS
-
FORMS
51
AND
UP
CfTDTCC
flD
PARALLEL
CONTINUOUS
RATINGS
ONE
SECOND
ft
RANGE
Series
Parallel
0.75
25.0
0.5
-
1.0
-
2.0
0.5
-
4.0
1.5
4.0
50.0
130.0
260.0
3.0
2.0
-
16.0
8.0
Series
Parallel
2.0
-
4.0
-
6.0
16.0
15.0
10.0
-
80.0
10.0
-
20.0
-
Series
Parallel
400.0
600.0
40.0
25.0
80.0
600.0
600.0
20.0
-
160.0
Series
Parallel
25.0
20.0
-
40.0
-
160.0
80.0
25.0
ft
Higher
currents
(
I
)
may
be
applied
for
shorter
lengths
of
time
(
T
)
in
accordance
with
the
formula
:
/
K
I
=
V
-
K
—
constant
T
The
current
-
closing
rating
of
the
contacts
is
30
amperes
for
voltages
not
exceeding
250
volts
.
CHARACTERISTICS
INDUCTION
UNIT
The
induction
unit
consists
of
a
conducting
disk
that
passes
through
the
poles
of
a
permanent
magnet
and
an
electromagnet
.
The
disk
is
free
to
rotate
with
a
vertically
suspended
shaft
,
but
is
restrained
in
one
direction
by
a
spring
.
When
energized
with
an
alternating
current
of
proper
magnitude
(
set
by
the
tap
position
)
,
the
electromagnet
produces
out
of
phase
fluxes
at
its
pole
faces
.
These
fluxes
interact
with
induced
currents
in
the
disk
to
produce
a
torque
on
the
disk
.
When
this
torque
exceeds
the
restraining
force
of
the
spring
,
the
disk
begins
to
rotate
at
a
speed
determined
by
the
magnetic
dragging
action
of
the
permanent
magnet
.
A
post
attached
to
the
rotating
shaft
travels
a
specific
distance
(
set
by
the
time
dial
)
,
and
makes
electrical
contact
with
a
fixed
member
.
Figure
6
gives
the
time
for
the
induction
unit
to
close
its
contacts
for
various
multiples
of
pickup
current
and
time
dial
settings
.
The
time
required
for
this
unit
to
reset
from
contact
closure
to
the
Number
10
time
dial
position
is
approximately
60
seconds
.
Burden
data
for
induction
unit
coils
is
listed
in
Table
VII
.
The
impedance
values
are
for
the
minimum
tap
.
The
impedance
for
other
taps
at
pickup
current
(
tap
6
Courtesy of NationalSwitchgear.com

GEK
-
86054
rating
)
varies
(
approximately
)
inversely
to
the
square
of
the
current
rating
,
following
equation
illustrates
this
:
The
Impedance
of
Any
Tap
at
Tap
Amps
/
Minimum
Tap
Amps
\
2
x
/
Impedance
at
\
Tap
Amps
^
Minimum
Tap
TABLE
VII
BURDENS
OF
INDUCTION
UNIT
COILS
VOLT
-
AMPS
AT
FIVE
AMPS
CALCULATED
FROM
INPUT
AT
MINIMUM
PICKUP
(
I
?
Z
1
PICKUP
RANGE
(
AMPS
1
FREQ
.
(
Hz
)
TAP
POWER
FACTOR
WATTS
1.0
-
3.0
60
1
118.4
15.2
0.13
50
1
98.6
12.7
0.13
1.5
-
4.5
60
1.5
52.5
6.7
0.13
50
1.5
43.7
5.6
0.13
2.5
-
7.5
60
2.5
18.8
2.5
0.13
50
2.5
15.7
2.1
0.13
4.0
-
12
60
4
7.4
0.95
0.13
50
4
6.2
0.79
0.13
For
forms
51
and
up
,
the
burden
of
the
induction
unit
is
as
shown
in
Table
VIII
:
TABLE
VIII
BURDENS
OF
INDUCTION
UNIT
COILS
-
FORMS
51
AND
UP
PICKUP
RANGE
(
AMPS
'
)
VOLT
-
AMPS
AT
FIVE
AMPS
CALCULATED
FROM
INPUT
AT
MINIMUM
PICKUP
(
I
^
Zl
FREQ
.
IMP
.
POWER
FACTOR
(
Hz
)
TAP
OHMS
0.6
-
1.8
60
0.6
110.75
4.43
0.32
0.33
50
0.6
48.0
1.92
1.5
-
4.5
60
1.5
17.75
0.71
0.35
50
1.5
11.5
0.46
0.37
2.5
-
7.5
60
2.5
6.75
0.27
0.44
50
2.5
5.75
0.23
0.47
4.0
-
12
60
4.0
4.48
0.18
0.52
0.47
50
4.0
4.05
0.16
7
Courtesy of NationalSwitchgear.com

GEK
-
86054
STANDARD
INSTANTANEOUS
UNIT
The
standard
instantaneous
unit
is
an
electromagnet
that
attracts
a
hinged
armature
when
sufficient
current
is
applied
,
contact
that
bridges
two
stationary
contacts
when
the
coil
is
energized
.
A
target
is
displayed
when
the
unit
operates
.
Pressing
the
button
in
the
lower
left
corner
of
the
relay
cover
resets
the
target
.
The
armature
carries
a
"
T
"
shaped
moving
The
pickup
range
can
be
adjusted
continuously
over
a
four
to
one
range
by
using
the
adjustable
pole
piece
.
When
the
top
of
the
core
is
lined
up
with
the
calibration
stampings
,
an
approximate
value
of
pickup
can
be
determined
.
Dropout
is
about
40
to
50
%
of
pickup
.
Figure
7
shows
the
variation
of
operating
time
with
applied
current
for
this
unit
.
Burden
data
of
the
standard
instantaneous
unit
is
tabulated
in
Table
IX
.
TABLE
IX
BURDEN
OF
STANDARD
INSTANTANEOUS
UNIT
IMPEDANCE
(
OHMS
)
POWER
FACTOR
VOLT
-
AMPStt
FREQ
PICKUP
RANGE
(
AMPS
)
(
HZ
)
AMPS
12.4
310
0.84
0.5
-
2
50
5
13.2
0.78
330
60
5
0.77
94
3.75
1
50
5
4
0.71
100
4.0
60
5
0.77
23
0.94
8
50
5
2
0.71
1.0
25
60
5
0.23
0.77
16
5
5.8
50
4
0.71
6.2
0.25
5
60
0.77
0.9
0.04
10
5
50
40
0.71
1.0
0.04
5
60
0.01
0.77
0.23
50
5
20
80
0.71
0.01
0.25
60
5
0.71
0.003
0.003
0.07
40
-
160
5
50
0.71
0.07
60
5
ft
Volt
-
amperes
at
5
amps
calculated
from
input
at
minimum
pickup
(
I
2
Z
)
.
CONSTRUCTION
The
IAC
66
A
,
B
,
and
C
relays
are
mounted
in
an
SI
case
(
that
does
not
have
an
upper
contact
block
)
.
The
case
is
suitable
for
either
semi
-
flush
or
surface
mounting
on
panels
up
to
two
inches
thick
.
Hardware
is
available
for
all
panel
thicknesses
.
To
be
sure
that
the
proper
hardware
will
be
provided
,
panel
thickness
should
be
specified
on
the
order
for
the
relay
.
Outline
and
panel
drilling
dimensions
are
shown
in
Figure
5
.
8
Courtesy of NationalSwitchgear.com

GEK
-
86054
The
relay
components
are
mounted
on
a
cradle
assembly
that
can
easily
be
removed
from
the
relay
case
.
The
cradle
is
locked
in
the
case
by
latches
at
the
top
and
bottom
.
Electrical
connections
between
case
and
cradle
blocks
are
completed
through
removable
connection
plugs
.
Separate
testing
plugs
can
be
inserted
in
place
of
the
connection
plugs
to
test
the
relay
in
its
case
.
The
cover
is
attached
to
the
case
from
the
front
,
and
includes
an
interlock
arm
that
prevents
the
cover
from
being
replaced
until
the
connection
plug
has
been
inserted
.
The
induction
unit
,
consisting
of
a
U
-
magnet
,
drag
magnet
and
a
disk
assembly
,
is
mounted
on
a
metal
frame
.
The
pickup
of
the
induction
unit
is
set
by
a
tap
block
located
near
the
top
of
the
relay
.
The
time
delay
is
adjusted
by
turning
the
molded
time
dial
,
located
just
below
the
tap
block
.
The
standard
instantaneous
unit
is
mounted
just
above
the
drag
magnet
on
the
right
hand
side
.
The
adjustable
core
can
be
raised
or
lowered
to
change
the
pickup
of
the
unit
.
The
unit
just
above
the
drag
magnet
on
the
left
is
a
target
seal
-
in
unit
for
the
induction
unit
.
This
seal
in
unit
does
not
have
an
adjustable
core
,
but
tap
screws
located
on
the
right
side
of
the
unit
can
be
used
to
change
pickup
.
Relay
construction
is
illustrated
in
Figures
1
A
and
IB
.
RECEIVING
,
HANDLING
AND
STORAGE
This
relay
,
when
not
included
as
part
of
a
control
panel
,
will
be
shipped
in
a
carton
designed
to
protect
it
against
damage
.
Upon
receipt
,
immediately
examine
the
relay
for
any
damage
sustained
in
transit
,
evident
,
file
a
damage
claim
at
once
with
the
transportation
company
,
and
promptly
notify
the
nearest
General
Electric
Sales
Office
.
If
the
equipment
is
not
to
be
installed
immediately
,
it
should
be
stored
indoors
in
a
location
that
is
dry
and
protected
from
dust
,
metallic
chips
and
severe
atmospheric
contaminants
.
If
damage
from
rough
handling
is
ACCEPTANCE
TESTS
Immediately
upon
receipt
of
the
relay
an
INSPECTION
AND
ACCEPTANCE
TEST
should
be
made
to
make
sure
that
no
damage
has
been
sustained
in
shipment
and
that
the
relay
calibrations
have
not
been
disturbed
,
that
readjustment
is
necessary
,
refer
to
the
section
on
SERVICING
.
These
tests
may
be
performed
as
part
of
the
installation
or
as
acceptance
tests
,
at
the
discretion
of
the
user
.
If
the
examination
or
test
indicates
Since
most
operating
companies
use
different
procedures
for
acceptance
and
for
installation
tests
,
the
following
section
includes
all
applicable
tests
that
may
be
performed
on
these
relays
.
VISUAL
INSPECTION
Check
the
nameplate
stamping
to
make
sure
that
the
model
number
and
rating
of
the
relay
agree
with
the
requisition
.
9
Courtesy of NationalSwitchgear.com

GEK
-
86054
Remove
the
relay
from
its
case
and
check
that
there
are
no
broken
or
cracked
molded
parts
or
other
signs
of
physical
damage
,
and
that
all
screws
are
tight
.
MECHANICAL
INSPECTION
There
should
be
no
noticeable
friction
when
the
disk
is
rotated
slowly
clockwise
.
The
disk
should
return
by
itself
to
its
rest
position
.
1
.
Make
sure
the
control
spring
is
not
deformed
,
nor
its
convolutions
tangled
or
touching
.
2
.
The
armature
and
contacts
of
the
seal
-
in
unit
,
as
well
as
the
armature
and
contacts
of
the
instantaneous
unit
,
should
move
freely
when
operated
by
hand
;
there
should
be
at
least
1
/
32
"
wipe
on
the
seal
-
in
contacts
.
3
.
The
targets
in
the
seal
-
in
unit
and
in
the
instantaneous
unit
must
come
into
view
and
latch
when
the
armatures
are
operated
by
hand
,
and
should
unlatch
when
the
target
release
lever
is
operated
.
Make
sure
that
the
fingers
and
shorting
bars
agree
with
the
internal
-
connections
diagram
.
4
.
5
.
CAUTION
Every
circuit
in
the
drawout
case
has
an
auxiliary
brush
.
It
is
especially
important
on
current
circuits
and
other
circuits
with
shorting
bars
that
the
auxiliary
brush
be
bent
high
enough
to
engage
the
connecting
plug
or
test
plug
before
the
main
brushes
do
.
This
will
prevent
Current
Transformer
(
CT
)
secondary
circuits
from
being
opened
.
See
Figure
1
.
ELECTRICAL
TESTS
DRAWOUT
RELAYS
,
GENERAL
Since
all
drawout
relays
in
service
operate
in
their
cases
,
it
is
recommended
that
they
be
tested
in
their
cases
or
an
equivalent
steel
case
.
In
this
way
,
any
magnetic
effects
of
the
enclosure
will
be
accurately
duplicated
during
testing
.
A
relay
may
be
tested
without
removing
it
from
the
panel
by
using
a
12
XLA
13
A
test
plug
.
This
plug
makes
connections
only
with
the
relay
and
does
not
disturb
any
shorting
bars
in
the
case
.
The
12
XLA
12
A
test
plug
may
also
be
used
.
Although
this
test
plug
allows
greater
testing
flexibility
,
it
requires
C
.
T
.
shorting
jumpers
and
the
exercise
of
greater
care
,
since
connections
are
made
to
both
the
relay
and
the
external
circuitry
.
POWER
REQUIREMENTS
,
GENERAL
All
devices
operating
on
alternating
current
(
AC
)
are
affected
by
frequency
.
Since
non
-
sinusoidal
waveforms
can
be
analyzed
as
a
fundamental
frequency
plus
harmonics
of
that
fundamental
frequency
,
it
follows
that
alternating
-
current
devices
(
relays
)
will
be
affected
by
applied
waveforms
.
AC
relays
(
and
AC
devices
in
general
)
are
significantly
affected
by
the
application
of
non
-
sinusoidal
waveforms
.
10
Courtesy of NationalSwitchgear.com