ABB CO User Manual

I
.
L
.
41
-
103
H
Apply
the
indicated
current
per
Table
I
for
the
electromagnet
plug
adjustment
(
e
.
g
.
CO
-
8
,
20
times
tap
value
)
and
measure
the
operating
time
.
Adjust
the
proper
plug
until
the
operating
time
corresponds
to
the
value
in
Table
I
.
(
Withdrawing
the
left
hand
plug
,
front
view
,
increases
the
oper
-
ating
time
and
withdrawing
the
right
hand
plug
,
front
view
,
decreases
the
time
.
)
In
adjusting
the
plugs
,
one
plug
should
be
screwed
in
completely
and
the
other
plug
run
in
or
out
until
the
proper
operating
time
has
been
obtained
.
tact
gap
spacing
to
slightly
less
than
1
/
16
of
an
inch
.
Bend
down
the
contact
springs
so
that
a
firm
contact
is
made
but
not
so
strong
that
the
minimum
pick
-
up
value
cannot
be
obtained
.
The
spring
tension
should
be
about
1
5
grams
.
Hold
the
relay
contacts
closed
and
with
an
auxiliary
relay
coil
connected
across
terminals
to
simulate
the
circuit
breaker
trip
coil
,
note
that
the
contactor
switch
picks
up
on
less
than
4
amperes
.
For
type
CO
-
11
relay
only
,
the
1.30
times
tap
value
operating
time
from
the
number
6
time
dial
Q
position
is
53.5
±
5
%
seconds
.
It
is
important
that
the
1.30
times
tap
value
current
be
maintained
accurately
.
The
maintaining
of
this
current
ac
-
curately
is
necessary
because
of
the
steepness
of
the
slope
of
the
time
-
current
characteristic
O
(
Fig
.
9
)
.
A
slight
variation
,
±
1
%
,
in
the
1.30
times
tap
value
current
(
including
measuring
instrument
deviation
)
will
change
the
timing
tolerance
to
±
10
%
and
the
effect
of
different
taps
can
make
the
total
variations
appear
to
be
±
15
%
.
If
the
operating
time
at
1.3
times
tap
value
is
not
within
these
limits
,
a
minor
adjustment
of
the
control
spring
will
give
the
correct
operating
time
without
any
undue
effect
on
the
minimum
pick
-
up
of
the
relay
.
This
check
is
to
be
made
after
the
2
times
tap
value
adjustment
has
been
completed
.
5
.
Operation
Indicator
(
OI
)
Pass
sufficient
current
(
a
-
c
)
through
the
opera
-
tion
indicator
to
just
operate
it
.
This
value
of
current
should
not
be
greater
than
3
amperes
.
The
operation
indicator
target
should
drop
freely
.
To
change
pickup
,
adjust
the
core
screw
.
6
.
Indicating
Instantaneous
Trip
Unit
(
IIT
)
The
making
of
the
contacts
and
target
indica
-
tion
should
occur
at
approximately
the
same
instant
.
Position
the
stationary
contact
for
a
mini
-
mum
of
1
/
32
"
wipe
.
The
bridging
moving
contact
should
touch
both
stationary
contacts
simul
-
taneously
.
Apply
sufficient
current
to
operate
the
IIT
.
The
operation
indicator
target
should
drop
freely
.
Recheck
the
permanent
magnet
adjustment
.
If
the
operating
time
for
this
calibration
point
has
changed
,
readjust
the
permanent
magnet
and
then
recheck
the
electromagnet
plug
adjustment
.
The
nameplate
data
will
furnish
the
actual
cur
-
rent
range
that
may
be
obtained
from
the
IIT
unit
.
RENEWAL
PARTS
4
.
De
-
ion
Contactor
Switch
(
CS
)
Repair
work
can
be
done
most
satisfactorily
at
the
factory
.
However
,
interchangeable
parts
can
be
furnished
to
the
customers
who
are
equipped
for
doing
repair
work
.
When
ordering
parts
,
always
give
,
the
complete
nameplate
data
.
Adjust
the
core
stop
on
the
top
as
high
as
pos
-
sible
without
allowing
the
insulating
bushing
at
the
bottom
of
the
plunger
to
touch
the
Micarta
angle
.
The
contact
will
be
separated
from
the
Micarta
angle
by
1
/
32
"
to
1
/
16
"
.
Adjust
the
con
-
16
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ABB CO Specifications

General

Brand	ABB
Model	CO
Category	Relays
Language	English