ABB CIRCUIT SHIELD 87T - Page 14

Transformer
Differential
Relay
IB
7.6
.
1.7
-
4
Page
14
TESTING
1
.
MAINTENANCE
AND RENEWAL
PARTS
No
routine maintenance
is
required
on
these
ABB
Circuit
-
Shield solid
-
state
relays
.
Follow
test
instructions
to
verify
periodically
that
the
relay
is
in
proper
working
order
.
We
recommend that
an
inoperative
relay
be returned
to
the
factory
for
repair
;
however
,
a
schematic
diagram
is available
on
request
.
Renewal
parts
will
be
quoted
on
request
to
the
factory
.
219
Series Units
:
Drawout
circuit
boards
of the
same
catalog
number
are
interchangible
.
identified
by
the
catalog
number
stamped
on
the front
panel
and
by
a
serial
number
stamped
on
the
bottom
side
of
the
drawout
circuit
board
.
The board
is
removed
using
the
metal
pull
knobs
on
the front
panel
.
Removing
the
board does
not
open
-
circuit
the
ct
secondaries
;
however
,
a
nuisance
operation
is
possible
if
removed
or
inserted
while
in
service
.
A
unit
is
An
18
point
extender board
,
catalog
200
X
0018
is
available
for
use
in
calibrating
or
troubleshooting
.
419
Series
Units
:
Metal
handles
provide
leverage
to
withdraw
the
relay
assembly
from
the
case
.
The
assembly
is
identified
by
a
catalog
number
stamped
on
the front
panel
of the
relay
and
a
serial
number
stamped
on
the bottom
of the
circuit
board
.
Test
connections
are
readily
made
to
the drawout
relay
unit
by
means
of standard
banana
plugs
.
Current
connections
are
made
to
the
vertical
posts
at
the blade
assemblies
.
Control
power
and
output
connections
are
made
at
the
rear
vertical
circuit
board
.
This
rear
board
is
marked
for
easier
identification
of the
connection
points
.
temporari
1
y
The value
1400
ohms
for
A
25
watt
resistor
is suitable
for
IMPORTANT
:
in
order
to test
the
drawout
unit
a
suitable
resistor
must
be
connected
between
terminals
9
and
10
on
the
rear
vertical
circuit
board
,
of
this
resistor
depends
on
the
control
voltage
rating
of the
relay
:
units
rated
125
vdc
,
200
ohms for
48
vdc
units
,
testing
.
If
no
resistor
is
readily
available
,
the
resistor
mounted
on
the
rear
of
the
relay
case
could
be
removed and
used
;
however
,
be
sure
to
remount
the
resistor
on
the
case
at
the
conclusion
of
testing
.
Should
separation
of
the
upper
and
lower
circuit
boards be
necessary
,
remove
the
(
2
)
screws
holding
the
handle
assemblies
in
place
.
Some
units
may
also
the
removal
of
(
2
)
screws
from the
underside
of
the
unit
near
the
rear
The lower
circuit
board
may
then
be
withdrawn
forward
from
the
printed
circuit
connector
.
An
18
point
extender
board
,
catalog
200
X
0018
is
available
to
provide
access
to
the
lower
circuit
board
for
calibration
or
trouble
-
shooting
.
Pisassembly
:
require
vertical
circuit
board
.
Test
Plug
:
test
units
,
a
1 1
Instruction
Book
IB
7.7
.
1.7
-
8
for
details
on
the
use
of
this
device
.
plug
assembly
,
catalog
400
X
0001
is
available
for
use
with
the
419
series
This device
plugs
into
the
relay
case
on
the
switchboard
and
allows
access
to
the
external
circuits
wired
to
the
case
including
the
ct
secondaries
.
See
A
2
.
HIGH
POTENTIAL TESTS
High
potential
tests
are
not
recommended
.
A
hi
-
pot
test
was
performed
at
the
factory
before
shipping
.
If
a
control
wiring
insulation
test
is
required
,
withdraw
the
drawout
element
from the
case
before
applying
the
test
voltage
.
Courtesy of NationalSwitchgear.com