ABB 511 Series - Page 18

IB
-
7.2
.
1.7
-
1
PAGE
18
SOLID
-
STATE
OVERCURRENT
RELAYS
Replacement
of
Terget
Head
Assembly
The
relay
target
is
an
electrically
operated
,
magneti
-
cally
held
device
.
Should
the
orange
/
black
target
disk
be
damaged
,
it
can
easily
be
replaced
.
Order
target
head
assembly
part
609283
-
102
from
the
factory
.
Replacement
procedure
:
1
.
From
the
front
of
the
relay
,
pull
the
existing
plastic
holder
straight
off
using
needle
nose
pliers
.
2
.
Carefully
place
the
new
target
assembly
on
the
pole
pieces
with
disk
end
closest
to
you
.
3
.
With
control
power
applied
,
press
the
target
reset
button
.
If
the
target
shows
orange
,
remove
the
as
-
sembly
,
rotate
180
degrees
,
and
reinstall
.
Actuate
target
reset
.
Target
should
turn
to
black
.
TESTING
1
.
MAINTENANCE
AND
RENEWAL
PARTS
CAUTION
:
Since
troubleshooting
entails
working
with
energized
equipment
,
caution
should
be
taken
to
avoid
personal
shock
.
Only
competent
technicians
familiar
with
good
safety
practices
should
service
these
de
-
vices
.
No
routine
maintenance
is
required
on
these
relays
.
Follow
test
instructions
to
verify
that
the
relay
is
in
proper
working
order
.
We
recommend
that
an
inopera
-
tive
relay
be
returned
to
the
factory
for
repair
;
however
,
a
circuit
description
and
/
or
a
schematic
diagram
are
available
for
those
who
wish
to
attempt
repairs
.
Contact
your
local
sales
engineer
or
contact
the
factory
.
These
relays
have
an
SCR
(
thyristor
)
as
the
output
stage
.
This
output
SCR
may
be
ordered
from
the
factory
(
part
no
.
605211
-
006
)
.
Replacement
target
head
assembly
may
be
ordered
should
the
target
be
mechanically
dam
-
aged
.
Also
available
from
the
factory
are
circuit
card
ex
-
tenders
.
All
these
relays
use
the
10
point
extender
,
catalog
200
X
0010
.
2
.
HIGH
POTENTIAL
TESTS
Do
not
apply
high
voltage
tests
to
solid
-
state
relay
circuits
.
If
a
control
wiring
insulation
test
is
required
,
bond
all
terminals
together
and
disconnect
grounding
wire
before
applying
test
voltage
.
Drawout
Element
Lower
drawout
circuit
boards
of
the
same
catalog
number
are
interchangeable
.
The
board
is
removed
by
using
the
metal
pull
knobs
on
its
front
panel
.
Removing
the
board
will
not
cause
an
open
C
.
T
.
secondary
or
a
false
trip
,
therefore
,
the
board
may
be
changed
while
the
relay
is
in
service
.
Note
that
the
relay
is
identified
by
a
serial
number
on
the
underside
of
the
circuit
board
.
The
relay
time
-
current
characteristic
and
control
voltage
rating
is
determined
by
the
drawout
element
.
This
nameplate
data
will
be
found
on
the
front
panel
of
the
drawout
element
.
3
.
ACCEPTANCE
TESTS
Follow
calibration
test
procedure
under
paragraph
4
.
Check
the
following
points
:
time
dial
1
,
current
5
-
times
pickup
;
time
dial
10
,
current
10
times
pickup
;
time
dial
10
,
current
5
times
pickup
.
Operating
times
should
be
within
±
5
%
of
the
times
shown
on
the
time
-
current
characteristic
curve
.
Courtesy of NationalSwitchgear.com