ABB CR Series User Manual

TYPES
CR
,
CRC
,
CRP
AND
CRD
RELAYS
TABLE
2
TIME
CURVE
CALIBRATION
DATA
-
50
AND
60
CYCLES
FOR
OVERCURRENT
UNIT
Permanent
Magnet
Adjustment
Electromagnet
Plug Adjustment
Time
Current
(
Multiples
of
Tap
Value
)
Operating
Time
(
Seconds
)
Current
(
Multiples
of
Tap
Value
)
Operating
Time
Relay
Type
Dial
Position
(
Seconds
)
2
6
3
0.57
20
0.22
5
6
2
37.80
10
14.30
6
6
2
2.46
20
1.19
7
6
2
4.27
20
1
.
11
8
6
2
13.35
20
1.11
9
6
2
8.87
20
0.65
11
6
2
0.24
A
11.27
20
A
For
50
hertz
Vo
-
11
,
20
times
operating
Time Limits
are
0.24
+
10
%
;
—
5
%
2
.
Minimum
Trip
Current
—
The
adjustment
of
the
spring
tension
in
setting
the
minimum
trip
current
value
of
the
relay
is
most
conveniently
made with
the
damping
magnet
removed
.
With
the
time
dial
set
on
“
0
”
,
wind
up
the
spiral
spring
by
means
of
the
spring
adjuster
until
approximately
6
-
3
/
4
convolutions show
.
Apply
the
indicated
current
per
Table
2
for
the
electro
-
magnet
plug
adjustment
(
e
.
g
.
CR
-
8
,
20
times
tap
value
)
and
measure
the
operating
time
.
Adjust
the
proper
plug
until
the
operating
time
corresponds
to
the
value
in
Table
2
.
(
Withdrawing
the
left
-
hand
plug
,
front
view
,
increases the
operating
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
.
Recheck the
permanent
magnet
adjustment
.
If
the
oper
-
ating
time
for
this calibration
point
has
changed
,
readjust
the
permanent
magnet
and
then recheck the
electromagnet
plug
adjustment
.
Set
the
relay
on
the
minimum
tap
setting
,
the
time
dial
to
position
6
.
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
backstop
at
tap
value
current
-
1.0
%
.
3
.
Time
Curve
Calibration
—
Install the
permanent
magnet
.
Apply
the indicated
current
per
Table
2
for
the
per
-
manent
magnet
adjustment
(
e
.
g
.
CR
-
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
2
.
B
.
Indicating
Contactor
Switch
-
Unit
(
ICS
)
Close
the
main
relay
contacts
and
pass
sufficient
d
-
c
current
through
the
trip
circuit
to
close
the
contacts
of
the
ICS
.
This
value
of
current
should
be
not
greater
than
the
particular
ICS
tap
setting
being
used
.
The
indicator
target
should
drop
freely
.
C
.
Indicating
Instantaneous
Trip
Unit
(
IIT
)
For
type
CR
-
11
relay
only
,
the
1.30
times
tap
value
operating
time
from
the
number
6
time
dial
position
is
54.9
±
5
%
seconds
.
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
.
19
)
.
A
1
%
variation
in
the
1.30
times
tap
value
current
(
including
measuring
instrument
deviation
)
will
change
the
nominal
operating
time
by
approximately
4
%
.
If
the
oper
-
ating time
at
1.3
times
tap
value
is
not
within
these
limits
,
a
minor
adjustment
of
the control
spring
will
give
the
cor
-
rect
operating
time
without
any
undue
effect
on
the
mini
-
mum
pick
-
up
of
the
relay
.
This check
is
to
be
made
after
the
2
times
tap
value
adjustment
has
been
completed
.
The
core screw
which
is
adjustable
from
the
top
of
the
trip
unit
determines the
pickup
value
.
The
trip
unit
has
a
normal
ratio
of
adjustment
of
1
to
4
and
an
accuracy
within the limits
of
10
%
.
The
making
of
the
contacts
and
target
indication should
occur
at
approximately
the
same
instant
.
Position
the
stationary
contact
for
a
minimum
of
1
/
32
”
wipe
.
The
bridging
moving
contact
should touch both
stationary
contacts
simultaneously
.
Apply
sufficient
current
to
operate
the
IIT
.
The indi
-
cator
target
should
drop
freely
.
22
Courtesy of NationalSwitchgear.com

ABB CR Series Specifications

General

Brand	ABB
Model	CR Series
Category	Relays
Language	English