GE AKR-50 - Page 22

Fault
Trip
Indicators
Indicators
are
designed
to
reduce
system
downtime
by
analyzing
any
overcurrent
fault
and
identifying
its
cause
.
Mechanical
pop
-
out
type
indicators
are
available
on
the
programmer
for
identifying
overload
or
short
circuit
overcurrent
faults
when
breakers
are
ordered
without
integral
ground
fault
protection
.
Indicators
are
available
to
identify
overload
,
short
circuit
and
ground
fault
trips
—
for
breakers
supplied
with
integral
ground
fault
protec
-
tion
.
OVERLOAD
SHORT
CIRCUIT
GROUND
FAULT
TRIP
INDICATOR
PUSH
TO
RESET
Zone
Selective
Interlocking
Transistor
Opto
-
isolator
in
The
standard
means
of
obtaining
selectivity
between
main
and
feeder
breakers
is
by
incorporating
programmers
with
time
-
coordinated
trip
characteris
-
tics
.
This
consists
of
setting
the
farthest
downstream
breaker
with
a
small
time
delay
,
and
progressively
increasing
the
time
delay
as
you
get
closer
to
the
main
protective
device
.
The
disad
-
for
the
ground
fault
vantage
in
this
method
is
that
the
system
must
now
endure
the
stress
of
the
high
current
fault
until
time
-
out
occurs
.
The
Zone
Selective
Inter
-
lock
module
,
Figure
21.1
,
receives
a
signal
from
a
downstream
MicroVersaTrip
programmer
(
Logic
0
)
which
causes
the
module
to
trans
-
mit
a
low
-
level
interlock
sig
-
nal
to
a
MicroVersaTrip
pro
-
grammer
upstream
.
The
interlock
signal
activates
the
LED
portion
of
an
LED
-
the
upstream
programmer
causing
the
fixed
delay
band
to
shift
from
"
MIN
”
to
the
Source
M
programmer
delay
band
setting
Figure
14.1
.
Both
the
Short
-
Time
and
Ground
Fault
functions
are
capable
of
being
interlocked
.
Zone
Selective
Interlock
-
ing
is
available
for
the
short
-
time
function
and
the
ground
fault
function
,
or
Zoned
M
ZSiM
No
.
I
1
V
CB
2
*
)
—
[
_
T
Zone
I
Zone
2
CB
3
1
HZSIM
No
.
3
l
—
function
only
.
Zone
3
CB
4
!
"
LI
L
2
(
Motor
—
Output
"
from
Programmer
"
input
"
to
Programmer
I
ZSIM
Downstream
Connections
Upstream
Connections
Wiring
Bus
Fig
.
21.1
Multi
-
Zone
Interlocking
21
Courtesy of store.ips.us