ABB CO User Manual

I
.
L
.
41
-
103
H
OPERATION
INDICATOR
(
01
)
contact
to
a
position
where
the
stationary
contact
is
resting
against
its
backstop
.
The
index
mark
located
on
the
movement
frame
should
coincide
with
the
“
O
”
mark
on
the
time
dial
.
No
setting
is
required
on
this
unit
.
INDICATING
INSTANTANEOUS
TRIP
(
IIT
)
The
core
screw
must
be
adjusted
to
the
value
of
pick
-
up
current
desired
.
b
)
For
relays
identified
with
a
“
T
”
,
located
at
lower
left
of
stationary
contact
block
,
the
index
mark
on
the
movement
frame
will
coincide
with
the
“
O
”
mark
on
the
time
dial
when
the
stationary
contact
has
moved
through
approximately
one
-
half
of
its
normal
deflection
.
Therefore
,
with
the
stationary
contact
resting
against
the
backstop
,
the
in
-
dex
mark
is
offset
to
the
right
of
the
“
O
”
mark
by
approximately
.
020
,
/
.
The
place
-
ment
of
the
various
time
dial
positions
in
line
with
the
index
mark
will
give
operating
times
as
shown
on
the
respective
time
-
current
curves
.
The
nameplate
data
will
furnish
the
actual
cur
-
rent
range
that
may
be
obtained
from
the
IIT
unit
.
INSTALLATION
The
relays
should
be
mounted
on
switchboard
panels
or
their
equivalent
in
a
location
free
from
dirt
,
moisture
,
excessive
vibration
and
heat
.
Mount
the
relay
vertically
by
means
of
the
mounting
stud
for
the
type
FT
projection
case
or
by
means
of
the
four
mounting
holes
on
the
flange
for
the
semi
-
flush
type
FT
case
.
Either
the
stud
or
the
mounting
screws
may
be
utilized
for
grounding
the
relay
.
The
electrical
connections
may
be
made
directly
to
the
terminals
by
means
of
screws
for
steel
panel
mounting
or
to
the
terminal
stud
furnished
with
the
relay
for
thick
panel
mounting
.
The
terminal
stud
may
be
easily
removed
or
inserted
by
locking
two
nuts
on
the
stud
and
then
turning
the
proper
nut
with
a
wrench
.
For
type
CO
-
1
1
relay
only
,
the
1.30
times
tap
value
operating
time
from
the
number
6
time
dial
Q
position
is
53.5
±
5
%
seconds
and
should
be
checked
first
.
It
is
important
that
the
1.30
times
tap
value
current
be
maintained
accurately
.
The
maintaining
of
this
current
accurately
is
necessary
because
of
the
steepness
of
the
slope
of
the
time
-
current
characteristic
(
Fig
.
9
)
.
A
slight
variation
,
±
1
%
,
in
the
1.30
times
tap
value
current
(
includ
-
ing
measuring
instrument
deviation
)
will
change
©
the
timing
tolerance
to
±
10
%
and
the
effects
of
different
taps
can
make
the
total
variations
appear
to
the
±
15
%
.
For
detail
information
on
the
FT
case
refer
to
I
.
L
.
41
-
076
.
ADJUSTMENTS
AND
MAINTENANCE
2
.
Minimum
Trip
Current
Set
the
time
dial
to
position
6
.
Alternately
apply
tap
value
current
plus
3
%
and
tap
value
cur
-
rent
minus
3
%
.
The
moving
contact
should
leave
the
backstop
at
tap
value
current
plus
3
%
and
should
return
to
the
backstop
at
tap
value
current
minus
3
%
.
The
proper
adjustments
to
insure
correct
oper
-
ation
of
this
relay
have
been
made
at
the
factory
.
Upon
receipt
of
the
relay
no
customer
adjust
-
ments
,
other
than
those
covered
under
“
SET
-
TINGS
”
should
be
required
.
O
PERFORMANCE
CHECK
3
.
Time
Curve
The
following
check
is
recommended
to
insure
that
the
relay
is
in
proper
working
order
:
Table
I
shows
the
time
curve
calibration
points
for
the
various
types
of
relays
.
With
the
time
dial
set
to
the
indicated
position
,
apply
the
currents
specified
by
Table
I
,
(
e
.
g
.
,
for
the
CO
-
2
,
3
and
20
times
tap
value
current
)
and
measure
the
operat
-
ing
time
of
the
relay
.
The
operating
times
should
equal
those
of
Table
I
plus
or
minus
5
percent
.
1
.
Contacts
a
)
By
turning
the
time
dial
,
move
the
moving
contacts
until
they
deflect
the
stationary
14
Courtesy of NationalSwitchgear.com

ABB CO Specifications

General

Brand	ABB
Model	CO
Category	Relays
Language	English