ABB 511 Series - Addend. A, 2(p.23)

IB
7.2
.
1.7
-
1
A
Addendum
A
Page
2
Type
51
Time
-
Overcurrent
Relays
TESTING
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
printed
circuit
board
.
This
rear
board is marked
for
easier
identification
of
the
connection
points
.
A
typical
calibration
test
circuit is shown
in
Fig
.
4
,
pg
.
19
of
IB
7.2
.
1.7
-
1
.
Note
:
when
testing
Series
423
relays
,
jumpers
must
be installed between terminals
9
-
10
-
11
on
the
rear
circuit board
to
complete
the
torque
control circuits
for
proper
operation
.
The
jumpers
must
be
removed
before
re
-
inserting
the
relay
in
its
case
.
TEST
PLUG
A
test
plug assembly
,
catalog
number
400
X
0001
is available
for
use
with
the
423
series units
.
This
device
plugs
into the
relay
case on
the
switchboard
and allows
access
to
all external circuits
wired
to
the
case
.
See
Instruction
Book
IB
7.7
.
1.7
-
8
for
details
on
the
use
of
this device
.
Note
:
the
X
51
C
Overcurrent
Relay
Test
Accessory
is
not
compatible
with
423
series units
.
MAINTENANCE
Should
separation
of
the
upper
and
lower
circuit boards be
necessary
,
remove
(
2
)
screws
that attach
the
left
and
right
handle
assemblies
to
the
upper
printed
circuit
board
.
The
lower
board
may
then
be
withdrawn
forward from
the
printed
circuit
connector
.
A
ten
point
extender
board is available
from
the
factory
if
access
to
the lower circuit board
is
required
during testing
or
troubleshooting
.
These
instructions do
not
purport
to
cover
all details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
Should further
information
be desired
or
should
particular problems
arise which
are
not
covered
sufficiently
for
the
purchaser
’
s
purposes
,
the
matter
should be
referred
to
Asea Brown Boveri
.
ABB
Power
T
&
D
Company
,
Inc
.
Protective
Relay
Division
Rev
.
2
(
3
/
90
)
Courtesy of NationalSwitchgear.com