ABB CRN-1 Manual

Instruction
Leaflet
I
.
L
.
41
-
251.2
P
All
II
m
»
ip
ABB
Power
T
&
D
Company
Inc
.
Relay
Divisions
Coral
Springs
,
FL
33065
Type
CRN
-
1
Reverse Power
Relay
50
and
60
Hertz
Effective
:
June
1991
Supersedes
I
.
L
41
-
251.2
N
Dated
April
1988
(
|
)
Denotes
Change
Since
Previous Issue
2.2
Directional
Unit
(
D
)
The directional unit is
a
product
induction
cylinder
type
unit
operating
on
the
interaction between the
polarizing
circuit
flux
and the
operating
circuit
flux
.
Mechanically
,
the
directional unit
is
composed
of four
basic
components
:
a
die
-
cast
aluminum
frame
,
an
electromagnet
,
a
moving
element
assembly
,
and
a
molded
bridge
.
The
frame
serves
as
the
mounting
structure
for
the
magnetic
core
.
The
magnetic
core
which houses the
lower
pin
bearing
is secured
to
the
frame
by
a
locking
nut
.
The
bearing
can
be
replaced
,
if
necessary
,
with
-
out
having
to
remove
the
magnetic
core
from
the
frame
.
The
electromagnet
has
two
series
-
connected
polariz
-
ing
coils mounted
diametrically
opposite
one
another
;
two
series
-
connected
operating
coils
mounted
dia
-
metrically
opposite
one
another
;
and
two
locating
pins
.
The
locating
pins
are
used
to
accurately
posi
-
tion the
lower
pin
bearing
,
which is mounted
on
the
frame
,
with
respect
to
the
upper
pin
bearing
,
which is
threaded into the
bridge
.
The
electromagnet
is
secured
to
the
frame
by
four
mounting
screws
.
The
moving
element
assembly
consists
of
a
spiral
spring
,
contact
carrying
member
,
and
an
aluminum
cylinder
assembled
to
a
molded hub which
holds
the
shaft
.
The
shaft
has
removable
top
and bottom
jewel
bearings
.
The
shaft
rides between
the bottom
pin
bearing
and the
upper
pin
bearing
with
the
cylinder
rotating
in
an
air
gap
formed
by
the
electromagnet
and the
magnetic
core
.
The
stops
for
the
moving
ele
-
ment
contact
arm
are
an
integral
part
of
the
bridge
.
The
bridge
is secured
to
the
electromagnet
and
frame
by
two
mounting
screws
.
In
addition
to
holding
CAUTION
Before
putting relays
into
service
,
remove
all
blocking
which
may
have been
inserted
for
the
purpose
of
securing
the
parts
during
shipment
,
make
sure
that all
moving
parts operate
freely
,
inspect
the
contacts to
see
that
they
are
clean
and
close
properly
,
and
operate
the
relay
to
check
the
settings
and
electrical
connections
.
1
.
APPLICATION
The
type
CRN
-
1
relay
is
a
single
phase
directionally
controlled
timing
relay
used
to
protect
ac
generators
from
motoring
.
When such
a
condition
occurs
and
persists
for
a
predetermined
time
interval
,
the
gener
-
ator
may
be
tripped
or
an
alarm
sounded
.
The
CRN
-
1
may
also be used
to
sense
lagging
power
factor
load
flow
in
an
abnormal direction
as
shown
in
Figure
6
.
The directional
unit has
30
°
maximum
torque
char
-
acteristics
and the
timer
unit is
adjustable
from
approximately
2
to
40
seconds
.
2
.
CONSTRUCTION
The
relay
consists
of
a
directional unit
,
a
timing
unit
,
and
an
indicating
contactor
switch unit
.
2.1
Timer
Unit
(
T
)
The
timer unit
operates
on
the induction
-
disc
princi
-
ple
.
A
main coil located
on
the
center
leg
of
an
“
E
”
type
laminated
structure
produces
a
flux
which
divides
and
returns
through
the
outer
legs
.
A
shading
coil
causes
the
flux
through
the
left
leg
(
front
view
)
to
lag
the main
pole
flux
.
The
out
-
of
-
phase
fluxes
thus
produced
in
the air
gap
causes a
contact
closing
torque
.
It
is similar
to
a non
-
tapped
version
of
the
voltage
unit
of
the
CV
Relay
(
see
I
.
L
.
41
-
201
)
.
All
possible
contingencies
which
may
arise
during
installation
,
operation
or
maintenance
,
and all details and
variations
of
this
equipment
do
not
purport
to
be covered
by
these instructions
.
If
further information
is
desired
by
purchaser
regarding
this
particular
installation
,
operation
or
maintenance
of
this
equipment
,
the
local Asea
Brown Boveri
representative
should
be
contacted
.
Printed
in
U
.
S
.
A
.
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
251.2
P
Figure
1
.
Type
CRN
-
1
Relay
Without
Case
.
1
=
Directional
Unit
(
D
)
.
2
=
Timer
Unit
(
T
)
.
3
=
Indicating
Contac
-
tor
Switch
(
ICS
)
.
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SCHEMATIC
rfUNAL
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WITH
RELATIVE
INSTANTANEOUS
POLARITY
AS
SHOWN
,
THE
DIRECTONAL
CONTACTS
CLOSE
.
Figure
2
a
.
Internal
Schematic
of
the
Single
Trip
Type
CRN
-
1
Relay
Without
ICS
Unitin
the
FT
-
21
CAse
.
Figure
2
.
Internal
Schematic
of
the
Single
Trip
Type
CRN
-
1
Relay
in
the
FT
-
21
Case
.
2
Courtesy of NationalSwitchgear.com

i
.
L
.
41
-
251.2
P
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IBSTABTAMOSIS
fOUAI
IT
AS
SHOVK
.
THE
PLMGTLOBAL
COaTACTS
CLOSE
im
i
TIME
DIAL
POSITION
Figure
4
.
Typical
Time
Curves
of
the
Timer
Unit
of
the
120
volt
Type
CRN
-
1
Relay
.
Propor
-
tional
voltages
apply
for
the
208
and
240
volt
relay
.
The
front
spring
,
in
addition
to
holding
the
target
,
pro
-
vides
restrain
for
the
armature
and
thus
controls
the
pickup
value
of
the
switch
.
3
.
CHARACTERISTICS
The
type
CRN
-
1
relay
is
available
with
either
a
120
,
208
,
or
240
volt
rating
.
3.1
Timer
Unit
(
T
)
The
timer
unit
is
rated
at
120
,
208
or
240
volts
,
60
hertz
.
The
minimum
operate
value
is
54
%
of
rated
voltage
.
The
continuous
overvoltage
capability
is
110
%
of
rated
voltage
.
Characteristic
time
curves
are
shown
in
Figure
4
for
various
voltages
and
time
dial
settings
.
3.2
Directional
Unit
(
D
)
The
directional
unit
has
its
maximum
torque
when
the
current
leads
the
voltage
by
30
°
.
The
relay
should
be
connected
using
the
30
°
connection
.
When
using
this
connection
the
maximum
torque
of
the
relay
occurs
at
100
%
P
.
F
.
The
pickup
value
is
.
02
amp
at
rated
voltage
and
maximum
torque
angle
.
The
pickup
may
be
increased
to
.
05
amp
or
higher
by
increasing
the
spring
tension
.
3.3
Trip
Circuit
The
main
contacts
will
safely
dose
30
amperes
at
250
volts
dc
and
the
seal
-
in
contacts
of
the
indicating
contactor
switch
will
safely
carry
this
current
long
enough
to
trip
a
circuit
breaker
.
Figure
3
.
Internal
Schematic
of
the
Double
Trip
Type
CRN
-
1
Relay
in
the
FT
-
21
Case
.
the
upper
pin
bearing
,
the
bridge
is
used
for
mount
-
ing
the
adjustable
stationary
contact
housing
.
The
stationary
contact
housing
is
held
in
position
by
a
spring
type
clamp
.
The
spring
adjuster
is
located
on
the
underside
of
the
bridge
and
is
attached
to
the
moving
contact
arm
by
a
spiral
spring
.
The
spring
adjuster
is
also
held
in
place
by
a
spring
type
clamp
.
With
the
contacts
closed
,
the
electrical
connection
is
made
through
the
stationary
contact
housing
clamp
,
to
the
moving
contact
,
through
the
spiral
spring
out
to
the
spring
adjuster
clamp
.
The
timer
unit
cannot
be
energized
unless
the
power
flow
is
in
the
tripping
direction
because
its
potential
coil
is
connected
in
series
with
the
contacts
of
the
directional
unit
.
Hence
,
the
relay
is
directionally
con
-
trolled
.
2.3
Indicating
Contactor
Switch
unit
(
ICS
)
The
dc
indicator
contactor
switch
is
a
small
clapper
type
device
.
A
magnetic
armature
,
to
which
leaf
-
spring
mounted
contacts
are
attached
,
is
attracted
to
the
magnetic
core
upon
energizing
of
the
switch
.
When
the
switch
closes
,
the
moving
contacts
bridge
two
stationary
contacts
,
completing
the
trip
circuit
.
Also
during
this
operation
two
fingers
on
the
arma
-
ture
deflect
a
spring
located
on
the
front
of
the
switch
,
which
allows
the
operation
indicator
target
to
drop
.
The
target
is
reset
from
the
outside
of
the
case
by
a
push
rod
located
at
the
bottom
of
the
cover
.
3
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
251.2
P
The
indicating
contactor
switch has
two
taps
that
pro
-
vide
a
pickup
setting
of
0.2
to
2
amperes
.
To
change
taps
requires
connecting
the lead
located
in
front
of
the
tap
block
to
the desired
setting by
means
of
a
screw
connection
.
For detail
information
on
the
FT
case
refer
to
I
.
L
.
41
-
076
.
For
correct
operation
,
the
type
CRN
-
1
relay
should
be
connected
so
that maximum
torque
occurs
for
unity
power
factor
on
the
system
.
Since
the
direc
-
tional unit has
a
30
°
characteristic
,
this
may
be
accomplished
by using
the
connections
shown
in
Figure
5
.
The
voltage
operated
timer
unit
should be
connected
across
the
line
.
External schematic
for
this
applica
-
tion
as
shown
in
Figure
5
.
6
.
ADJUSTMENTS
AND
MAINTENANCE
The
proper
adjustments
to
insure
correct
operation
of
this
relay
have been
made
at
the
factory
and
should
not
be
disturbed
after
receipt
by
the
customer
.
If
the
adjustments
have
been
changed
,
the
relay
taken
apart
for
repairs
,
or
if
it
is desired
to
check
the
adjust
-
ments
at
regular
maintenance
periods
,
the instruc
-
tions
in
Section
6.1
,
“
Acceptance
Check
”
should
be
followed
.
All
contacts
should be
cleaned
periodically
.
A
contact
burnisher
Style
#
182
A
836
H
01
is
recommended
for
this
purpose
.
The
use
of
abrasive material
for
clean
-
ing
contacts
is
not
recommended
,
because
of
the
danger
of
embedding
small
particles
in
the
face
of
the
soft
silver and thus
impairing
the
contact
.
6.1
Acceptance
Check
The
following
check is
recommended
to
insure that
the
relay
is
in
proper
working
order
.
a
.
Timer
Unit
(
T
)
The directional unit
contacts
must
be
in
the
closed
position
when
checking
the
operation
of
the
timer unit
.
b
.
Contact
By turning
the
time dial
,
move
the
moving
con
-
tacts
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
.
For double
trip
relays
,
the
follow
on
the
stationary
contacts
should
be
approximately
1
/
64
”
.
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
3.4
Trip
Circuit
Constant
Indicating
Contact Switch
(
ICS
)
0.2
ampere
tap
6.5
ohms
dc resistance
2.0
amperes
tap
0.15
ohm
dc
resistance
4
.
SETTINGS
There
is
only
one
setting
to
be determined
.
This is
the time
delay
of
the
voltage
operated
timer
,
and
it
is
adjusted by
the time
dial
position
.
Figure
4
gives
a
curve
of
time
delay
vs
.
time dial
setting
for
various
impressed
voltages
.
Time is
approximately
propor
-
tional
to
time dial
setting
.
4.1
Indicating
Contactor
Switch
(
ICS
)
No
setting
is
required
on
the
ICS
unit
except
the
selection
of
the
0.2
or
2.0
amperes
tap
setting
.
This
selection
is made
by
connecting
the
lead
located
in
front of
the
tap
block
to
the
desired
setting
by
means
of
the
connecting
screw
.
When the
relay energizes
a
125
or
250
volt
dc
type
WL
relay
switch
,
or
equiva
-
lent
,
use
the
0.2
ampere
tap
.
5
.
INSTALLATION
The
relays
should
be
mounted
on
switchboard
pan
-
els
or
their
equivalent
in
a
location
free
from
dirt
,
moisture
,
excessive
vibration and heat
.
Mount
the
relay
vertically by
means
of
the
rear
mounting
stud
or
studs
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
.
Exter
-
nal
toothed
washers
are
provided
for
use
in
the
loca
-
tions shown
on
the
outline
and
drilling
plan
to
facilitate
making
a
good
electrical connection
between
the
relay
case
,
its
mounting
screws
or
studs
,
and the
relay
panels
.
Ground
wires
are
affixed
to
the
mounting
screws
or
studs
as
required
for
poorly
grounded
or
insulating
panels
.
Other
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
.
4
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
251.2
P
RELAY
TRIPS
FOR
POWER
FLOW
IN
THIS
DIRECTION
-
^
A
PHASE
ROTATION
A
,
B
,
C
D
.
C
.
TRIP
BUS
A
POS
.
32
B
10
o
NOTE
-
GROUNO
MAY BE
SUBSTITUTED
FOR
EITHER
LOW
SIOE
FUSE
.
ICS
_
[
ics
J
32
>
T
_
J
_
32
-
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ics
£
k
32
32
-
0
32
VA
8
VC
±
;
52
a
32
-
0
32
-
T
52
TC
NEC
.
DIRECTIONAL
TIMING
UNIT
DEVICE
NUMBER
CHART
32
-
REVERSE
POWER
RELAY
TYPE
CRM
-
1
3
Z
-
D
-
DIRECTIONAL
ELEMENT
OF
CRN
-
1
32
-
T
-
TIMER
OF
CRN
-
1
52
-
POWER
CIRCUIT
BREAKER
ICS
-
INDICATING
CONTACTOR
SWITCH
TC
-
BREAKER
TRIP
COIL
52
*
-
BREAKER
AUXILIARY
CONTACT
ZERO
TORQUE
LINE
CLOSING
ZONE
Sub
5
184
A
466
Figure
5
.
External
Schematic
of
the
Type
CRN
-
1
for
Reverse
Power
Protection
.
TRIP
DIRECTION
ABC
GENERATION
—
tP
±
r
PHASE
ROTATION
A
,
B
,
C
UTILITY
P
SYSTEM
POWER
TRANSFORMER
!
r
i
52
I
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TIE
i
STATION
32
-
0
L
2
3
_
2
BUS
n
A
8
C
NCTE
-
GROUND
MAYBE
SUBSTITUTED
FOR
EJTHES
LOW
SIDE
FUSE
.
O
.
C
.
TRIP
BUS
POS
Tii
v
0
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32
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32
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6
*
±
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$
±
32
-
T
±
32
-
T
±
TC
$
+
\
VA
DEVICE
NUMBER
CHART
\
CLOSING
ZONE
DIRECTIONAL
UNIT
\
.
IA
v
\
MAX
TORQUE
WHENIA
f
A
\
/
LEADS
VBC
8
Y
30
*
Til
3
?
\
o
—
11
-
REVERSE
POWER
RELAY
TYPE
CHI
-
1
32
-
0
-
DIRECTIONAL
ELEMENT
OF
CRN
-
1
32
-
T
-
TIMER
OF
CRN
-
1
52
-
P
01
EI
CIRCUIT
BREAKER
ICS
-
INDICATIMC
CONTACTOR
SNITCH
TC
-
BREAKER
TRIP
COIL
32
A
-
BREAKER
AUXILIARY
CONTACT
2
I
±
52
a
V
0
C
I
\
Y
TIMING
UNIT
v
8
VC
\
ZERO
TORQUE
Sub
5
849
A
137
LINE
\
\
NEG
\
Figure
6
.
External
Schematic
of
the
CRN
-
1
Relay
to
Prevent
Reverse
Magnetization
When
Utility
Tie
is
Removed
From
the
Local
System
.
5
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
251.2
P
normal
deflection
.
Therefore
,
with
the
stationary
contact
resting
against
the
backstop
,
the
index
mark
is
offset
to
the
right
of
the
“
O
”
mark
by
approximately
.
020
”
.
The
placement
of
the
vari
-
ous
time
dial
positions
in
line
with
the
index
mark
will
give
operating
times
as
shown
on
the
respec
-
tive
time
-
voltage
curves
.
For
double
trip
relays
,
the
follow
on
the
stationary
contacts
should
be
approximately
1
/
32
”
.
c
.
Minimum
Operate
Voltage
Set
the
time
dial
to
position
6
.
Alternately
apply
54
%
of
rated
voltage
plus
3
%
and
minus
3
%
.
The
moving
contact
should
leave
the
backstop
at
plus
3
%
and
should
return
to
the
backstop
at
minus
3
%
.
6.1
.
2
Directional
Unit
(
D
)
a
Contact
Gap
The
gap
between
the
stationary
contact
and
moving
contact
with
the
relay
in
a
de
-
energized
position
should
be
approximately
.
022
”
.
b
.
Sensitivity
The
respective
directional
units
should
trip
with
value
of
energization
and
phase
angle
relation
-
ships
as
indicated
in
Table
1
.
The
pickup
may
be
increased
to
.
05
amp
or
higher
by
increasing
the
spring
tension
.
6.2
Routine
Maintenance
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
relays
because
of
the
resulting
distorted
current
wave
form
which
produces
an
error
in
timing
.
d
.
Time
Curve
Figure
4
shows
the
time
curve
for
the
CRN
-
1
relay
.
With
the
time
dial
set
to
the
indicated
posi
-
tion
,
apply
the
voltages
specified
and
measure
the
operating
time
of
the
relay
.
The
operating
times
should
equal
those
of
Figure
4
plus
or
minus
5
%
.
All
contacts
should
be
periodically
cleaned
.
A
contact
burnisher
Style
#
182
A
836
H
01
is
recommended
for
this
purpose
.
The
use
of
abrasive
material
for
clean
-
ing
contacts
is
not
recommended
,
because
of
the
danger
of
embedding
small
particles
in
the
face
of
the
soft
silver
and
thus
impairing
the
contact
.
6.1
.
1
Indicating
Contactor
Switch
(
ICS
)
Close
the
main
relay
contacts
and
pass
sufficient
dc
current
through
the
trip
circuit
to
close
the
contacts
of
the
ICS
.
This
value
of
current
should
not
be
greater
than
the
particular
ICS
tap
setting
being
used
.
The
indicator
target
should
drop
freely
.
6.3
Calibration
Use
the
following
procedure
for
calibrating
the
relay
if
the
relay
has
been
taken
apart
for
repairs
or
the
adjustments
have
been
disturbed
.
This
procedure
should
not
be
used
unless
it
is
apparent
that
the
relay
is
not
in
proper
working
order
.
(
See
Section
6.1
,
“
Acceptance
Check
”
)
.
The
contact
gap
should
be
approximately
.
047
between
the
bridging
moving
contact
and
the
adjust
-
able
stationary
contacts
.
The
bridging
moving
con
-
tact
should
touch
both
stationary
contacts
simultaneously
.
TABLE
1
DIRECTIONAL
UNIT
SENSITIVITY
Values
for
Min
.
Pick
-
up
1
,
Amperes
Relay
Type
Ratings
Volts
Phase
Angle
Relationship
Volts
I
leading
V
by
30
°
t
1
,
I
In
-
phase
with
V
.
CRN
-
1
120
,
208
,
240
Rated
Rated
.
020
.
023
I
^
The
energization
quantities
are
input
quantities
at
the
relay
terminals
.
ft
Maximum
torque
angle
.
6
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
251.2
P
6.4
Minimum
Operate
Voltage
The
adjustment
of
the
spring
tension
in
setting
the
minimum
operate
voltage
of
the
relay
is
most
conve
-
niently
made
with
the
damping
magnet
removed
.
Close
the directional
contacts
.
With
the time dial
set
on
“
O
”
,
wind
up
the
spiral
spring
by
means
of
the
spring adjuster
until
approxi
-
mately
6
3
/
4
convolutions
show
.
Set
the
relay
dial
to
position
6
.
Adjust
the control
spring
tension
so
that the
moving
contact
will
leave the
backstop
at
65
volts
+
1.0
%
and
will
return
to
the
backstop
at
65
volts
-
1.0
%
.
This
value is
for
the
120
volt
relay
.
Proportional
voltage
apply
for
the
208
and
240
volt
relay
.
6.5
Time
Curve
Calibration
Install
the
permanent
magnet
.
Set
the time dial
to
position
#
11
.
Apply
rated
voltage
to
terminals
6
and
7
with
the
directional
contacts
closed
.
Adjust
the
permanent
magnet
keeper
until
the
operating
time
is
40
seconds
±
3
%
.
6.6
Indicating
Contactor
Switch
-
Unit
(
ICS
)
Close
the main
relay
contacts
and
pass
sufficient
dc
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
.
6.7
Directional
Unit
(
D
)
The
upper
pin
bearing
should
be screwed
down until
there is
approximately
.
025
”
clearance
between
it
and
the
top
of shaft
bearing
.
The
upper
pin
bearing
should then
be
securely
locked
in
position
with
the
locknut
.
The
lower
bearing
position
is
fixed
and
can
-
not
be
adjusted
.
The
contact
gap
adjustment
for
the
directional unit
is
made
as
follows
:
With
the
moving
contact
in
the
normally
opened posi
-
tion
,
i
.
e
.
,
against
the
right
stop
on
bridge
,
screw
in
the
stationary
contact
until
both
contacts
just
close
as
indicated
by
a neon
lamp
in
the
contact
circuit
.
Then
,
screw
the
stationary
contact
away
from
the
moving
contacts
3
/
4
of
a
turn
.
The
clamp
holding
the
stationary
contact
housing
need
not
be
loosened
for
the
adjustment
since the
clamp
utilizes
a
spring
-
type
action
in
holding
the
sta
-
tionary
contact
in
position
.
Tl
«
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HOTS
Mil
kill
.
HUT
CMTACT
OPCIS
TIMCI
STOP
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.
KCUT
—
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1
TO
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STAIT
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(
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LOCK CLOSED
rm
$
T
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POTClTlOCTU
TEST
SIITCI
A
.
C
.
SSPPLT
Sub
2
184
A
368
Figure
7
.
Test
Connections
for
the Timer
Unit
of
the
Type
CRN
-
1
Relay
in
the
Type
FT
-
21
Case
.
6.3
.
1
Timer Unit
(
T
)
a
.
Contact
By turning
the time dial
,
move
the
moving
con
-
tacts
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
.
For
double
trip
relays
,
the
follow
on
the
stationary
contacts
should be
approximately
1
/
64
”
.
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 index
mark is
offset
to
the
right
of
the
“
O
”
mark
by
approximately
.
020
”
.
The
placement
of
the vari
-
ous
time dial
positions
in
line
with
the index mark
will
give
operating
times
as
shown
on
the
respec
-
tive time
-
voltage
curves
.
For double
trip
relays
,
the
follow
on
the
stationary
contacts
should be
approximately
1
/
32
”
.
7
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
251.2
P
polarizing
circuit
is
at
the
maximum
torque
angle
or
when the
circuit
relationship
has the
operating
and
polarizing
circuits
in
phase
.
It is recommended
that
a
single
phase
(
in
phase
relationship
)
set
-
up
be used
as a
matter
of
ease
and convenience
.
The
set
screw
in
the
stationary
contacts
have
been
factory
adjusted
for
optimum
follow
and thus
adjust
-
ment
should
not
be
disturbed
.
The
moving
contact
assembly
has been
factory
adjusted
for
low
contact
bounce
performance
and
should
not
be
changed
.
6.8
Maximum
Torque
Adjustment
Apply
rated
voltage
to
terminals
6
and
7
,
and
4
amperes
to
terminals
8
and
9
,
making
sure
the
polar
-
ities
are
correct
.
With the
voltage
and
current
in
phase
,
the
contacts
should close
.
Now
adjust
the
angle
between
current
and
voltage
to
120
°
(
current
leading
the
voltage
)
.
Adjust
the
resistor
to
just
close
the
contacts
.
Contacts
should
open
when the
angle
between
current
and
voltage
is
120
°
+
1
°
leading
.
The
sensitivity
adjustment
is made
by varying
the
tension
of
the
spiral
spring
attached
to
the
moving
element
assembly
.
The
spring
is
adjusted by placing
a
screwdriver
or
similar
tool
into
one
of
the notches
located
on
the
periphery
of
the
spring adjuster
and
rotating
it
.
The
spring adjuster
is located
on
the
underside
of
the
bridge
and
is
held
in
place
by
a
spring
type
clamp
that does
not
have
to
be
loosened
prior
to
making
the
necessary
adjustments
.
The
spring
is
to
be
adjusted
such that
the
contacts
will
close
as
indicated
by
a
neon
lamp
in
the
contact
circuit
when
energized
with
the
required
current
and
voltage
as
shown
in
Table
1
.
This table
indicates
that
the
spring
can
be
adjusted
when the
phase
angle
relationship
between
the
operating
circuit
and the
RATINGS
Circuit
Continuous
Voltage
-
100
%
of
Rating
Current
-
5
Amperes
ENERGY
REQUIREMENTS
The
50
and
60
hertz
burden
of
the units
of
the
type
CRN
-
1
relay
are as
follows
:
Volt
*
Power
Burden
at
Amperes
Factor
Coil
Rated
Voltage
6.5 73
°
Timer
Directional
Potential Rated
Voltage
3.5
Directional
Current
5
Amperes
*
Angle
that
current
lags
the
voltage
60
°
47
°
5.5
7
.
RENEWAL
PARTS
Repair
work
can
be done
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
.
8
Courtesy of NationalSwitchgear.com

PANEL
DRILLING
RND
CUTOUT
FOR
SEMI
-
FLUSH
MTG
.
CASE
OUTLINE
5.563
(
141.30
)
2.781
(
70.64
)
-
6.063
(
154.00
)
1.594
•
(
40.49
)
.
250
DIR
.
(
6.35
)
-
4
HOLES
FOR
.
190
-
32
MTG
.
SCREWS
5.119
(
132.56
)
*
I
f
.
563
(
14.30
)
9.668
(
246.08
)
9.063
(
230.20
)
CRSE
c
\
I
4.844
(
123.04
)
<
n
10.438
(
265.13
)
4.531
(
115.09
)
LARGE
INTERNAL
AND
EXTERNAL
TOOTH
WASHER
190
-
32
SCREW
1
/
1
?
.
n
*
SEMI
-
FLUSH
MTG
.
-
3.188
(
80.98
)
.
125
R
(
3.18
)
M
SMALL
EXTERNAL
TOOTH
WASHER
•
2.938
(
74.63
)
5.875
(
149.23
)
PROJECTION
MTG
.
6.375
-
(
161.93
)
PANEL
PANEL
LOCATIONS
PANEL
DRILLING
OR
CUTOUT
FOR
TERMINAL
AND
MTG
.
DETHILS
PROJECTION
MTG
.
(
FRONT
VIEW
)
FOR
PROJECTION
MTG
.
PANEL
2.688
•
(
68.28
)
.
563
DIR
.
(
14.29
)
2
HOLES
CRSE
SPACERS
FOR
THIN
PANELS
^
5
/
16
-
18
SCREW
(
FOR
THICK
PANELS
[
r
USE
5
/
16
-
18
STUDS
)
>
INTERNAL
-
EXTERNAL
_
TOOTH
WASHERS
T
1.344
(
34.14
)
-
5.375
•
(
136.53
)
.
0
lB
<
.
397
>
,
-
«
NOTE
PROJECTION
HARDWARE
MUST
BE
ORDERED
SEPARATELY
.
H
^
r
.
250
(
6.350
)
.
190
-
32
SCREW
1.031
“
(
26.19
)
1.344
(
34.14
)
.
375
R
(
9.53
)
FOR
THICK
PANELS
USE
.
190
-
32
STUDS
TYP
.
n
i
i
1
.
594
1.0
(
15.09
)
(
25.4
)
z
T
*
3
9
S
7
1
T
1.813
(
46.05
)
2.0
I
.
64
!
DIA
.
(
16.20
)
PANCL
(
50.8
)
1
1
6
e
10
2
I
r
"
DIMENSIONS
IN
INCHES
(
DIMENSIONS
IN
MILLIMETERS
)
TERMINAL
NUMBER
4
*
.
516
(
13.11
)
.
750
DIA
.
(
19.05
)
10
HOLES
OR
1
CUTOUT
*
Sub
16
57
D
7901
ls
>
-
1.031
(
26.19
)
TYP
.
Ol
to
X
<
0
Figure
8
.
Outline
and
Drilling
Plan
for
the
Type
CRN
-
1
Relay
in
the
Type
FT
-
21
Case
.
Courtesy of NationalSwitchgear.com