ABB 511 Series - Page 3

IB
-
7.2
.
1.7
-
1
PAGE
3
SOLID
-
STATE
OVERCURRENT
RELAYS
PLACING
THE
RELAY
INTO
SERVICE
Time
Dial
One
of
ten
(
10
)
time
-
current
curves
is
selected
by
a
two
-
element
control
labeled
TIME
on
the
left
side
of
the
relay
front
panel
.
a
)
A
ten
position
SWITCH
giving
discrete
steps
1
through
10
.
b
)
A
screwdriver
adjusted
VERNIER
providing
continuous
time
adjustment
between
steps
.
When
the
vernier
,
marked
“
ADJ
”
,
is
turned
to
the
extreme
counterclockwise
position
,
the
time
-
current
curve
shown
on
the
switch
has
been
selected
.
The
vernier
provides
a
continuous
time
adjustment
between
the
switch
selected
curve
and
the
curve
indicated
by
the
next
higher
number
.
Intermediate
positions
can
be
verified
by
test
.
Instantanoous
Instantaneous
pickup
is
selected
by
the
potentiometer
dial
on
the
right
side
of
the
relay
front
panel
.
The
dial
is
labeled
"
INST
.
"
The
markings
indicate
multiples
of
the
pickup
tap
setting
.
1
.
RECEIVING
,
HANDLING
,
STORAGE
Upon
receipt
of
the
CIRCUIT
-
SHIELD
relay
(
when
not
included
as
part
of
a
switchboard
)
examine
for
shipping
damage
.
If
damage
or
loss
is
evident
,
file
a
claim
at
once
and
promptly
notify
the
nearest
Asea
Brown
Boveri
Of
-
fice
.
Use
normal
care
in
handling
to
avoid
mechanical
damage
.
The
CIRCUIT
-
SHIELD
system
has
no
vital
moving
parts
and
if
kept
reasonably
clean
and
dry
,
has
no
practical
limit
to
its
operating
life
.
2
.
INSTALLATION
Mounting
The
outline
dimensions
and
panel
drilling
and
cutout
information
is
given
in
Figure
2
.
Connections
External
connection
diagram
is
shown
in
Figure
1
.
For
the
instantaneous
function
to
be
operable
Terminals
9
and
10
must
be
externally
shorted
.
Instantaneous
relay
operation
can
be
cancelled
for
reclosing
applications
by
using
an
external
supervisory
contact
connected
to
these
terminals
.
For
example
,
if
the
phase
one
(
1
)
tap
is
set
at
six
(
6
)
amperes
and
the
INST
dial
is
set
at
eight
(
8
)
,
the
INST
,
setting
is
:
For
the
TIME
function
to
be
operable
terminals
10
and
11
must
be
externally
shorted
.
The
TIME
function
can
be
cancelled
for
directional
or
voltage
control
by
using
an
external
supervisory
contact
connected
to
these
terminals
.
6
amps
X
8
=
48
amps
Consequently
,
an
instantaneous
trip
will
occur
at
48
amps
in
phase
one
(
1
)
of
the
relay
.
TESTING
IN
SERVICE
In
general
,
it
is
not
necessary
to
schedule
periodic
maintenance
of
this
relay
.
However
,
if
a
trip
test
is
desired
to
confirm
the
proper
functioning
of
the
system
,
the
following
procedure
can
be
used
.
Mounted
in
Switchgear
Tests
should
be
made
on
a
de
-
energized
main
circuit
.
If
tests
are
to
be
made
on
an
energized
circuit
,
be
sure
to
take
all
necessary
precautions
.
It
is
customary
to
test
the
trip
circuit
of
electro
-
mechanical
overcurrent
relays
by
manually
closing
the
trip
contacts
to
trip
their
associated
circuit
breakers
.
If
the
contacts
are
allowed
to
part
before
the
seal
-
in
contact
closes
,
the
relay
contacts
are
eroded
by
the
arc
.
Also
,
high
transient
voltages
will
appear
from
trip
bus
to
positive
.
This
problem
is
avoided
in
the
CIRCUIT
-
SHIELD
overcurrent
relay
by
the
operatic
nal
test
feature
.
Separate
pushbuttons
labeled
"
TRIP
'
'
are
provided
for
the
TIME
and
INST
,
functions
.
The
pushbuttons
,
recessed
to
prevent
accidental
operations
,
will
cause
the
breaker
to
trip
.
All
CIRCUIT
-
SHIELD
relays
have
metal
front
panels
which
are
connected
through
printed
circuit
board
runs
and
connector
wiring
to
a
terminal
at
the
rear
of
the
relay
case
.
The
terminal
is
marked
"
G
"
and
is
located
as
shown
in
Fig
.
2
below
.
In
all
applications
this
terminal
should
be
wired
to
ground
.
Special
care
must
be
taken
to
connect
control
power
in
the
proper
polarity
.
Reversing
plus
(
+
)
and
minus
(
-
)
will
cause
SCR
A
and
SCR
Bto
block
the
flow
of
trip
current
and
the
relay
will
not
function
.
For
capacitor
trip
applications
,
the
plus
{
+
)
output
of
the
capacitor
trip
device
must
be
connected
to
terminal
7
of
the
relay
,
the
negative
(
-
)
to
terminal
8
.
3
.
SETTINGS
Current
Pickup
Taps
A
tap
block
for
each
phase
is
located
on
the
relay
front
panel
.
Each
tap
block
provides
for
seven
(
7
)
pickup
settings
which
are
marked
in
CT
secondary
amperes
.
When
a
pin
is
pulled
out
.
that
phase
switches
to
the
maximum
tap
setting
.
The
pin
may
be
moved
with
the
relay
in
service
.
Courtesy of NationalSwitchgear.com