GE IAC59A User manual

INSTRUCTIONS
UNDERCURRENT
GET-21903
F
Supersedes
GEI-21903
E
Insert
Booklet
GEI-1753
AND
OVERCURRENT
RELAYS
Types
IAC59A,
1AC59B,
and 1AC59(
GENERALS
ELECT’
IC

Undercurrent
and
Overcurrent
flelays
Type
IAC
Figure
1.
(IC-6400264)
Time-Current
Characteristics
for
IAC59C
Relays.
Figure
2.
(K-6400289)
Time-Current
Characteristics
for
Type
IAC59B
Relay
IQ
IC
0
C
Type
IAC59A
and
2

Undercurrent
and
Overcurrent
Relays
Type
IAC
(Ih1)
LJTOUT
.21V
_G8
7
DSLL
ECE
15M
E44UI.45
CASE
P
EL
(?
HOLES)
[tOLLED
1
\
(OFA
I
,Ltsruo
(2Vk4?4)
it
3 DRILL
VIEW SHOWIN
(IhLU)
IAMbA
00
E
1 DSILL
(Il
(to HOLES)
(9MM)
PAN DfILLING
F0l
MOHING
115
VOLTS RTE1i
HLQUNCY
MF2 IHMER
S 2
IAC
AOJUST6(
RES
Figure
5. (K-6400302)
Type
IAC59A
and IAC59B Relays,
Test Connections
PANEL
DWNG
F SDdI-FWSH
MOUNTING (FRONT
VIEW)
*
Figure
6. (6209271-6)
Outline
and
Panel Drilling
for the Type
IAC59A
Relay
*Indicates
revision
5

UNDERCURRENT
AND
OVERCURRENT
RELAYS
TYPE IAC
INTRODUCTION
These
instructions
are
a supplement
to
instruc
tion
book
GEH-1753
which
is
included
in
this
book.
The
combination
of
the
two
form
complete
instruc
tions
for
the
Types
IAC59A,
JAC59B
arid
IAC59C
relays.
The Type
IAC59A
relay
is
similar
in
construc
tion
and
operation
to
the
Type
IAC51A
relay,
des
cribed in
the
included
instructions,
except
that
it
has
double
throw
contacts
with
a
seal-in
unit
for
each
contact.
The
left-hand
contacts
are
adjusted
to
close
at
tap
value
of
current
while
the
right-hand
contacts
may be
adjusted
to
close from
50
to
95
percent
of
tap
value.
The
Type
IAC59B
relay
is
similar
to
the
Type
IACS9A
relay
except
that
it is
a
short
time relay
adjusted
to
close its
right-hand
contacts
when
the
current
is
reduced
to
tap
value.
The
left-hand
con
tact
may
be
adjusted
to
close
from
105
to
150
per
cent
of
tap
value.
MOUNTING
The
outline
and
panel
drilling
dimensions
for
these
relays
are
shown in
Fig.
6
of
this
supplement,
CON
NECTIONS
Internal
connection
diagrams
are
shown
in fig.
3 and
Fig.
4
inclusive.
ADJUSTMENTS
AND
TESTS
With
connections
as
shown
in
Fig.
5
pickup
ad
justments
and
time
checks
may
be
made.
The
relay is
energized
for
pickup
or
dropout
check
by
closing
Si.
Unless
otherwise
requested
the
IAC59A
is
set
at
the
factory
to
close
its
right
contacts
at
80%
of
tap
value and
the
IAC59B
is
set
to
close
its
left
contacts
at
110%
of
tap
value.
If
it
is
desired
to
change
this
percentage
or
contact
spread,
the
following
procedure
is
necessary.
Turning
the
spring-adjusting
ring, as
described
under
“current
setting”
of
the
included
instructions,
affects
primarily
the
current
required
to
close
the
left
contacts,
Rotating
the
right-hand
moving
con
tact,
after
loosening
the
clamping screws
holding
it
The
Type
LAC59C
relay
is
similar
to
the
Type
IAC59A
relay
except
that
the
seal-in
units
are
omitted.
BURDENS
Burdens
for
the
various relay
ratings
at
mini
mum
pick-up
current
and
60
cycles
are
given
in
the
following
table:
Mm—
Cont.
Relay Tap
Pick-
Cur-
Volt-
Imp. P,F.
Type Range
up rent Amps
Ohms
IAC59A
0,5-2
0,5
5
1,17 4,71 .27
IACS9C
1.5—6
1.5 15 1,17 0,52
.25
4-16
4.0 15 1.36
0.08
.38
IAC59B
0,5-2
0.5 2.5 4.72
18,90
.29
1.5—6
1,5
7,5
4,68 2.08
.26
4—16
4,0 15
I492
0,31
.27
in
place, changes
the
current
required
to close
the
right contacts,
Each
of
these adjustments
affects
the
other,
hence simultaneous
adjustment
for
clos
ing
left
and
closing
right
must
be
made
to
obtain the
desired
contact
spread,
The
relays
are
adjusted
at the factory
to
give
the
time
characteristics
shown
in
Fig.
1
and
Fig.
2,
The
time
may
be
changed
slightly
by
changing
the
position
of
the
permanent
magnet
on
its
supporting
shelf.
In
general,
moving
the
magnet toward
the
back
of
the
relay
decreases
its
time
of
operation.
To
check
overcurrent
time, suddenly
apply
the
desired
preset
current
to
the
relay
by
closing
Si.
The
time
read
on
the
timer
is
that
required
to
close
the
left contacts.
To
check the
undercurrent
time close
Si
and
S2
and,
using Ri,
adjust
the
current
to
a
value
greater
than
that required
to
close
the
left-hand
contacts.
With
S2
open,
use
R2
to
set
the
current
to
the
desired
value
below
the
current required
to
close
the
right-hand contacts.
Then
with
Sl
and
S2
both
closed,
open
S2.
The
time
read
on
the
timer
is
that
required
for
the
right
contacts to
close
when
the
current
is
suddenly
reduced
from
a
value
sufficient
to
close
the
left-hand
contacts,
to
a
predetermined
value,
INSTALLATION
These
instructions
do
not
purport
to
cover
ll
details or
variations in
equipment nor
to
provide for
every
possible contingency
Co
be
met
in
connection
with
installation, operation or
maintenance. Should
further
information
be
desired
or should
particular problems
arise
which
az-c
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 applicablo
ANSI, IEP’E
and
WEMA
standards;
but
no such assurance
is
given with
respect
to
loca 7
codes
and
ordinances
because
they
vary
greatly.
3

OPERATING
CO
I
L
Figure
3.
(K-6400242)
Type
IAC59A
and
IAC59B
Relays
Internal
Con
nections
(Front
View).
Un&rcurrent
and
Overcurrent
Relays
Type
IAC
SEAL—I
N
ELEMENT
9
SHORT FINGER
OPERAT
I
NO
COIL
LI.
4
—
SHORT
FINGR
Figure
4.
(K-6400432) Type
IAC59C
Relay
Internal
Connections
(Front
View).
4

GENERAL ELECTRIC
COMPANY
POWER
SYSTEMS
MANAGEMENT
BUSINESS
DEPT.
PHILADELPHIA,
PA.
19142
GENERAL
ELECTRIC
7-80
2-(8

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GEH-1753
Time
Overcurrent
Relays
Type
IAC
TOP
PIVOT
-
_____________
TAP
PLUG
SEAL-IN
UNIT
HOLDING COIL
SEAL-IN
(j
SEAL-IN
UNIT
STATIONARY
CONTACT,
LEFT
SEAL-IN
UNIT
STATIONARY
CONTACT,
RIGHr
SEAL-IN
MOVING
CON
TA CT
ASSEMBLV
A
-
(S006996)
Front
View
B
—
(8006997)
8ar
View
FiBur
B
educLicnj
Ln
L
or
Tvp- JAC
Re
1ay
—
/
r’ 1
LOWER
JEWEL
SCREW—_3
2