ABB CO User Manual

I
.
L
.
41
-
103
H
CO
UNIT
4
.
De
-
ion
Contactor
Switch
(
CS
)
1
.
Contacts
The
de
-
ion
contactor
switch
should
operate
with
a
minimum
of
4
amperes
a
-
c
applied
.
By
turning
the
time
dial
,
move
the
moving
contacts
until
they
deflect
the
stationary
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
.
a
)
5
.
Operation
Indicator
(
01
)
The
operation
indicator
should
operate
with
a
minimum
of
3
amperes
a
-
c
applied
.
The
operation
indicator
target
should
drop
freely
.
6
.
Indicating
Instantaneous
Trip
Unit
(
IIT
)
For
relays
identified
with
a
UT
”
,
located
at
lower
left
of
stationary
contact
block
,
the
index
mark
on
the
movement
frame
will
coin
-
cide
with
the
"
O
”
mark
on
the
time
dial
when
the
stationary
contact
has
moved
through
approximately
one
-
half
of
its
normal
deflec
-
tion
.
Therefore
,
with
the
stationary
contact
resting
against
the
backstop
,
the
index
mark
is
offset
to
the
right
of
the
"
O
”
mark
by
ap
-
proximately
.
020
"
.
The
placement
of
the
various
time
dial
positions
in
line
with
the
index
mark
will
give
operating
times
as
shown
on
the
respective
time
-
current
curves
.
b
)
The
core
screw
which
is
adjustable
from
the
top
of
the
trip
unit
determines
the
pickup
value
.
The
trip
unit
has
a
nominal
ratio
of
adjustment
of
1
to
4
and
an
accuracy
within
the
limits
of
10
%
.
The
making
of
the
contacts
and
target
indica
-
tion
should
occur
at
approximately
the
same
in
-
stant
.
The
stationary
contact
should
have
a
mini
-
mum
of
1
/
32
"
wipe
.
The
bridging
moving
contact
should
touch
both
stationary
contacts
simul
-
taneously
.
2
.
Minimum
Trip
Current
ROUTINE
MAINTENANCE
The
adjustment
of
the
spring
tension
in
setting
the
minimum
trip
current
value
of
the
relay
is
most
conveniently
made
with
the
damping
mag
-
net
removed
.
All
relays
should
be
inspected
periodically
and
the
time
of
operation
should
be
checked
at
least
once
every
year
or
at
such
other
time
intervals
as
may
be
dictated
by
experience
to
be
suitable
to
the
particular
application
.
Phantom
loads
should
not
be
used
in
testing
induction
-
type
re
-
lays
because
of
the
resulting
distorted
current
wave
form
which
produces
an
error
in
timing
.
With
the
time
dial
set
on
"
O
”
,
wind
up
the
spiral
spring
by
means
of
the
spring
adjuster
until
approximately
6
-
3
/
4
convolutions
show
.
Set
the
relay
on
the
minimum
tap
setting
,
the
time
dial
to
position
6
.
All
contacts
should
be
periodically
cleaned
.
A
contact
burnisher
No
.
182
A
836
H
01
is
recom
-
mended
for
this
purpose
.
The
use
of
abrasive
material
for
cleaning
contacts
is
not
recom
-
mended
,
because
of
the
danger
of
embedding
small
particles
in
the
face
of
the
soft
silver
and
thus
impairing
the
contact
.
Adjust
the
control
spring
tension
so
that
the
moving
contact
will
leave
the
backstop
at
tap
value
current
+
1.0
%
and
will
return
to
the
back
-
stop
at
tap
value
current
-
1.0
%
.
3
.
Time
Curve
Calibration
CALIBRATION
Install
the
permanent
magnet
.
Use
of
the
following
procedure
for
calibrating
the
relay
if
the
relay
has
been
taken
apart
for
repairs
or
the
adjustments
disturbed
.
This
pro
-
cedure
should
not
be
used
until
it
is
apparent
that
the
relay
is
not
in
proper
working
order
.
(
See
O
"
Performance
Check
”
.
)
Apply
the
indicated
current
per
Table
1
for
per
-
manent
magnet
adjustment
(
e
.
g
.
CO
-
8
,
2
times
tap
value
)
and
measure
the
operating
time
.
Adjust
the
permanent
magnet
keeper
until
the
operating
time
corresponds
to
the
value
of
Table
I
.
15
Courtesy of NationalSwitchgear.com

ABB CO Specifications

General

Brand	ABB
Model	CO
Category	Relays
Language	English