ABB KF Manual
A
»
11
ABB
Power
T
&
D
Company
Inc
.
Relay
Division
Coral
Springs
,
FL
33065
Instruction
Leaflet
I
.
L
.
41
-
503
N
Type
KF
Underfrequency
Relay
Effective
July
1980
Supersedes
I
.
L
.
41
-
503
M
dated
May
1975
^
Denotes
change
since
previous
issue
CAUTION
:
Before
putting
relays
into
service
,
re
-
move
all
blocking
which
may
have
been
inserted
for
the
purpose
of
securing
the
parts
during
ship
-
ment
,
make
sure
that
all
movings
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
.
necessary
,
without
having
to
remove
the
magnetic
core
from
the
frame
.
The
elec
-
tromagnet
has
four
coils
mounted
on
the
four
poles
.
The
coils
mounted
diametrically
op
-
posite
each
other
are
connected
in
series
.
The
locating
pins
of
the
electromagnet
are
used
to
accurately
position
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
.
APPLICATION
The
type
KF
relay
is
a
high
-
speed
under
-
frequency
relay
which
provides
rapid
sensing
of
system
overload
so
that
excessive
load
can
be
shed
.
It
is
particularly
suitable
for
relatively
isolated
areas
where
a
severe
overload
(
i
.
e
.
,
more
than
50
%
)
could
occur
due
to
a
tie
-
line
trip
.
G
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
.
CONSTRUCTION
&
OPERATION
The
relay
consists
of
an
induction
cylinder
unit
,
frequency
sensitive
components
,
indicating
contac
-
tor
switch
,
and
auxiliary
time
delay
unit
(
T
)
.
The
principal
parts
of
the
relay
can
be
seen
in
Figure
1
.
A
.
Induction
Cylinder
Unit
The
induction
cylinder
unit
is
a
product
type
unit
operating
on
the
interaction
between
the
fluxes
that
are
produced
on
the
four
poles
.
Mechanically
,
the
induction
unit
is
composed
of
four
basic
components
;
a
die
cast
aluminum
frame
,
an
electromagnet
,
moving
element
assembly
and
a
molded
bridge
.
The
frame
serves
as
a
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
The
bridge
is
secured
to
the
electromagnet
and
frame
by
two
mounting
screws
.
In
addition
to
holding
the
upper
pin
bearing
,
the
bridge
is
used
for
mounting
the
adjustable
stationary
contact
housing
.
The
stationary
contact
hous
-
ing
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
ad
-
juster
is
also
held
in
place
by
a
spring
type
clamp
.
With
the
contacts
closed
,
the
electrical
connection
is
made
through
the
stationary
con
-
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
.
Courtesy of NationalSwitchgear.com
I
.
L
.
41
-
503
N
INTERNAL
SCHEMATIC
INTERNAL
SCHEMATIC
—
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TEST
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1
TCMINAL
»
TERMINAL
FRONT
VIEW
FRONT
VIEW
861
A
659
862
A
525
Fig
.
2
.
Internal
Schematic
of
Type
KF
Relay
with
AC
Operated
Auxiliary
Time
Delay
Unit
Fig
.
3
.
Internal
Schematic
of
Type
KF
Relay
with
AC
Operated
Adjustable
Auxiliary
Time
Delay
Unit
.
tact
housing
clamp
,
to
the
moving
contact
,
through
the
spiral
spring
out
to
the
spring
ad
-
juster
clamp
.
C
.
Frequency
Sensitive
Components
:
The
frequency
sensitive
components
consist
of
capacitors
and
a
variable
reactor
which
is
used
for
setting
the
relay
to
trip
at
the
desired
fre
-
quency
.
B
.
Indicating
Contactor
Switch
Unit
(
ICS
)
The
indicating
contactor
switch
is
a
small
dc
operated
clapper
type
device
.
A
magnetic
ar
-
mature
,
to
which
leaf
-
spring
mounted
contacts
are
attached
,
is
attracted
to
the
magnetic
core
upon
energization
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
armature
deflect
a
spring
located
on
the
front
of
the
switch
which
allows
the
operation
in
-
dicator
target
to
drop
.
The
target
is
reset
from
the
outside
of
the
case
by
a
push
rod
located
at
the
bottom
of
the
cover
.
D
.
Auxiliary
Time
Delay
Unit
1
.
AC
Operation
—
Non
-
Adjustable
This
slugged
telephone
type
relay
in
con
-
junction
with
a
resistor
,
capacitor
and
full
wave
bridge
provides
time
delay
on
pick
-
up
when
the
KF
relay
contacts
close
.
The
con
-
tacts
of
the
auxiliary
time
delay
unit
are
connected
in
the
trip
circuit
.
2
.
AC
Operation
—
Adjustable
This
telephone
relay
in
conjunction
with
a
static
timing
circuit
and
full
wave
bridge
provides
adjustable
time
delays
(
i
.
e
.
6
cycles
to
30
cycles
)
or
pickup
when
the
KF
relay
contacts
close
.
The
contacts
of
the
auxiliary
time
delay
unit
are
connected
in
the
trip
cir
-
cuit
.
The
front
spring
,
in
addition
to
holding
the
target
,
provides
restraint
for
the
armature
and
thus
controls
the
pickup
value
of
the
switch
.
3
Courtesy of NationalSwitchgear.com
Trip
Circuit
The
main
contacts
will
close
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
.
The
indicating
contactor
switch
has
two
taps
that
provide
a
pickup
setting
of
0.2
or
2
amperes
.
To
change
taps
requires
connecting
of
lead
located
in
front
of
the
tap
block
to
the
desired
setting
by
means
of
a
screw
connection
.
INTERNAL
CMOUTIC
TELEPHONE
RELAY
-
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6
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ADJUSTMENT
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CYLINDER
UNIT
:
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#
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Time
Delay
KF
with
DC
Timer
—
6
to
30
cycles
(
ad
-
justable
)
KF
with
AC
Timer
—
6
to
30
cycles
(
ad
-
justable
)
KF
with
AC
Timer
—
6
cycles
(
non
-
adjustable
)
7
INDICATING
CONTACTOR
SNITCH
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UNIT
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VALUE
TUP
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01
TACE
200
A
41
,
41
/
125
ITS
15
00
ft
.
Trip
Circuit
Constants
Indicating
Contactor
Switch
—
0.2
amp
tap
6.5
ohms
dc
resistance
2.0
amp
tap
0.15
ohms
dc
resistance
Energy
Requirements
Sub
.
9
849
A
318
©
Fig
.
4
.
Internal
Schematic
ot
Type
KF
Relay
with
DC
Operated
Adjustable
Auxiliary
Time
Delay
Unit
.
3
.
DC
Operation
This
telephone
relay
in
conjunction
with
a
static
timing
circuit
provides
adjustable
time
delays
(
i
.
e
.
6
cycles
to
30
cycles
)
on
pickup
when
the
KF
relay
contacts
close
.
The
contacts
of
the
auxiliary
time
delay
unit
are
connected
in
the
trip
circuit
.
Voltage
Timer
Condition
Burden
Relay
Type
AC
60
Hertz
KF
with
DC
Timer
N
/
A
14.7
VA
120
KF
with
Adjustable
AC
Timer
Energized
De
-
energized
29
,
4
V
A
14.7
VA
120
KF
with
Non
-
Adjustable
AC
Timer
Energized
De
-
energized
20.4
V
A
14.7
VA
CHARACTERISTICS
120
The
KF
relay
operates
to
close
its
contacts
when
the
applied
source
frequency
is
below
a
preset
value
.
The
operating
characteristic
curves
for
the
various
auxiliary
time
delay
settings
for
©
Frequency
changing
frequency
conditions
is
shown
in
Figure
SETTINGS
The
relay
is
set
for
trip
frequency
by
means
of
the
reactor
adjusting
screws
.
The
relays
are
calibrated
to
trip
at
V
2
hertz
below
rated
frequency
unless
otherwise
specified
.
Turning
either
of
the
adjusting
screws
in
a
clockwise
direction
decreases
the
frequency
at
which
the
relay
trips
.
The
rate
of
change
of
frequency
per
second
versus
hertz
below
trip
frequency
at
contact
closure
is
shown
in
Figure
5
for
various
time
delays
.
5
.
Rating
The
type
KF
underfrequency
relay
is
rated
120
volts
at
60
hertz
,
or
120
volts
at
50
hertz
.
The
ad
-
justable
range
of
frequency
is
55
to
59.5
hertz
for
the
60
hertz
relay
and
44
to
49.5
hertz
for
the
50
hertz
relay
.
4
Courtesy of NationalSwitchgear.com
A
.
Induction
Cylinder
Unit
Contact
Gap
-
The
gap
between
the
stationary
contact
and
the
moving
contact
with
the
relay
in
the
deenergized
position
should
be
ap
-
proximately
1
/
16
inch
.
Indicating
Contactor
Switch
(
ICS
)
The
only
setting
of
the
ICS
unit
required
is
the
selection
of
the
0.2
or
2
ampere
pick
-
up
tap
.
This
is
accomplished
by
connecting
the
lead
located
in
front
of
the
tap
block
to
the
desired
terminal
by
©
means
of
a
connecting
screw
.
When
the
relay
energizes
a
125
-
or
250
-
volt
type
WL
relay
switch
,
or
equivalent
,
use
the
0.2
ampere
tap
;
for
48
-
volt
dc
applications
set
the
unit
in
a
tap
2
and
use
a
type
WL
relay
with
a
S
#
304
C
209
G
01
coil
,
or
equiva
-
lent
.
The
relay
is
shipped
set
for
2.0
tap
.
B
.
Frequency
Adjusting
Reactor
1
.
Minimum
Trip
-
Using
a
variable
frequen
-
cy
source
apply
120
V
at
rated
frequency
for
1
hour
to
allow
the
relay
to
reach
normal
operating
temperature
.
Apply
120
V
at
the
specified
trip
frequency
to
the
relay
.
The
contacts
should
just
close
.
If
no
other
trip
frequency
has
been
specified
the
relays
are
calibrated
to
trip
at
59.5
hertz
,
for
the
60
hertz
relay
and
49.5
hertz
for
the
50
hertz
relay
.
2
.
Reduce
voltage
to
40
volts
.
Check
calibra
-
tion
.
The
cylinder
unit
contacts
should
close
0.06
to
0.08
hertz
above
the
trip
frequency
.
C
.
Indicating
Contactor
Switch
Close
the
auxiliary
time
delay
unit
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
in
-
dicator
target
should
drop
freely
.
The
contact
gap
should
be
approximately
0.047
”
between
the
bridging
moving
contact
and
the
adjustable
stationary
contacts
.
The
bridging
moving
contact
should
touch
both
.
stationary
contacts
simultaneously
.
D
.
Auxiliary
Time
Delay
Unit
(
T
)
1
.
AC
Operation
—
Non
-
Adjustable
Block
cylinder
unit
contacts
closed
.
Apply
50
volts
ac
to
terminals
8
and
9
of
the
KF
relay
.
The
T
unit
should
operate
.
Reduce
voltage
to
approximately
20
volts
ac
.
The
T
unit
should
drop
out
.
At
rated
voltage
the
time
delay
obtained
from
the
telephone
relay
should
be
6
cycles
.
Time
vs
voltage
curve
is
shown
in
Figure
9
.
2
.
AC
Operation
-
Adjustable
Block
cylinder
unit
contacts
closed
.
Apply
50
volts
a
.
c
.
to
terminals
8
and
9
of
the
KF
relay
.
The
T
unit
should
operate
.
Reduce
©
DC
Tap
In
the
KF
relay
with
dc
operated
auxiliary
time
delay
unit
,
selection
of
the
125
or
48
volt
tap
must
be
made
on
resistor
R
2
depending
on
the
battery
voltage
.
INSTALLATION
The
relays
should
be
mounted
on
switchboard
panels
or
ther
equivalent
in
a
location
free
from
dirt
,
moisture
,
excessive
vibration
and
heat
.
Mount
the
relay
vertically
by
means
of
the
moun
-
ting
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
fur
-
nished
with
the
relay
for
thick
panel
mounting
.
The
terminal
stud
may
be
easily
removed
or
in
-
serted
by
locking
two
nuts
on
the
stud
and
then
turning
the
proper
nut
with
a
wrench
.
For
detailed
information
on
the
FT
case
,
refer
to
I
.
L
.
41
-
076
.
ADJUSTMENTS
&
MAINTENANCE
The
proper
adjustments
to
insure
correct
operation
of
this
relay
have
been
made
at
the
fac
-
tory
.
Upon
receipt
of
the
relay
no
customer
ad
-
justments
,
other
then
those
covered
under
“
SETTINGS
”
should
be
required
.
Acceptance
Check
The
following
check
is
recommended
to
insure
that
the
relay
is
in
proper
working
order
.
6
Courtesy of NationalSwitchgear.com
I.L.
41-503N
voltage to approximately 15 volts ac and the
Tunit should drop out. At rated voltage the
time delay obtained should be 6 cycles. The
timer can be set to provide up to 30 cycles
delay by adjusting the rheostat located on
the rear sub base. (See Figure 1). Time vs
voltage curves are shown in Figure 9.
3. DC Operation
Energize terminals 10 and 4 with rated dc
voltage. Place switch across KF relay con-
tacts. Closing the switch will now energize
the timing circuit. The time delay obtained
from the telephone relay should be 6 cycles.
The timer can be set to provide up to 30
cycles delay by adjusting the rheostat
located on the rear sub base. See Fig. 1.
Routine Maintenance
All relays should be inspected and checked
periodically to assure proper operation. Generally
a visual inspection should call attention to any
noticable
changes. A minimum suggested check on
the relay system is to close the contacts manually
to assure that the breaker trips and the target
drops. Then release the contacts and observe that
the reset is smooth and positive.
All contacts should be periodically cleaned. A
contact burnisher S#l82A836HO 1 is recommend-
ed for this purpose. The use of abrasive material
for cleaning contacts is not recommended, because
of the danger of embedding small particles in the
face of the soft silver and thus impairing the con-
tact.
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
“Acceptance Check”).
A. Induction Cylinder Unit
1. The upper pin bearing should be screwed
down until there is approximately 0.025”
clearance between it and the top of shaft
bearing. The upper pin bearing should then
be securely locked in position with the lock
nut. The lower bearing position is fixed and
cannot be adjusted.
2.
0
3.
The contact gap adjustment for the cylinder
unit is made as follows:
With the moving contact in the
normally-
opened position, that is, against the right
stop on the bridge, screw in the right hand
stationary contacts until it just makes with
the moving contact. Then advance the
stationary contact an additional
‘/4
turn.
Screw the left hand stationary contact until
it just touches the moving contact then back
off the stationary contact two turns for a
gap of
l/
16 of an inch. The clamp holding
the stationary contact need not be loosened
for this adjustment, since the clamp utilizes
a spring-type action in holding the
stationary contact in position.
The set screw in the stationary contacts has
been shop adjusted for optimum follow and
this adjustment should not be disturbed.
The moving contact assembly has been fac-
tory adjusted for low contact bounce perfor-
mance and should not be changed.
The sensitivity adjustment is made by vary-
ing 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 n
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 when
the relay is deenergized the moving contact
just resets. Then move the spring adjuster
3/16
of a turn in the same direction.
B. Frequency Adjusting Reactor
The relay should be preheated for 1 hour with
120 volts and rated frequency before calibra-
tion is attempted. A source of variable frequen-
cy is required and should be connected to ter-
minals 8 and 9 of the relay.
Set the source frequency to 59.5 hertz and ad-
just the frequency adjusting screws (see Fig.
1)
until the cylinder unit contact closes to the left.
7
Courtesy of NationalSwitchgear.com
Reduce
voltage
to
40
volts
and
raise
frequency
to
59.57
hertz
.
Adjust
control
spring
so
that
cylinder
unit
contact
just
closes
to
the
left
.
Raise
voltage
to
120
volts
and
recheck
59.5
set
-
tings
.
Adjust
'
frequency
adjusting
screws
if
necessary
.
Recheck
40
volt
setting
,
it
should
be
between
59.56
and
59.58
hertz
.
Repeat
above
procedure
if
necessary
until
relay
contacts
are
made
between
the
frequency
limits
.
60
59
5
59.50
Hz
.
SETTING
59
f
4
-
58
5
58
N
X
575
Z
>
-
C
.
Indicating
Contactor
Switch
(
ICS
)
Close
the
auxiliary
time
delay
unit
(
T
)
contact
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
in
-
dicator
target
should
drop
freely
.
D
.
Auxiliary
Time
Delay
Unit
1
.
AC
Operation
—
Non
-
Adjustable
Block
the
KF
relay
contacts
closed
.
Energize
terminals
8
and
9
of
the
relay
with
rated
voltage
and
frequency
.
Time
the
clos
-
ing
of
the
telephone
relay
contacts
.
This
time
should
be
6
cycles
.
o
i
z
57
Id
57.00
Hz
SETTING
o
Id
56
5
cr
ti
-
ci
.
56
cr
2
555
2
z
I
2
55
55.00
Hz
.
SETTING
54.5
54
-
40
-
30
-
20
-
10
0
+
10
+
20
+
30
+
40
+
50
+
60
+
70
TEMPERATURE
°
C
863
A
519
Fig
.
6
.
Typical
Temperature
vs
.
Minimum
Frequency
Curves
60
Hertz
KF
Underfrequency
Relay
60
60
59
5
59
5
59.50
Hz
.
SETTING
5950
Hz
SETTING
59
i
59
585
585
58
58
N
X
hi
X
z
z
575
575
>
>
-
o
u
z
z
57
57
UJ
LU
Z
>
5700
Hz
.
SETTING
o
o
5700
Hz
SETTING
UJ
Ld
cr
565
565
x
Id
a
.
a
or
x
56
56
I
2
2
3
555
55
5
2
5
z
z
2
C
c
,
55
!
5500
Hz
.
SETTING
5500
H
2
SETTING
545
y
54
5
y
i
54
54
Q
I
0
20
30
40
50
60
70
80
90
iOC
IIC
20
3
C
40
50
60
70
80
90
ICO
IIC
I
20
I
30
^
PRESSED
-
OuTAGE
TIME
m
MINUTES
863
A
520
863
A
527
Fig
.
7
.
Typical
Voltages
vs
.
Minimum
Frequency
Curves
60
Hertz
KF
Underfrequency
Relay
Fig
.
8
.
Warm
-
Up
Curve
60
Hertz
KF
Underfrequency
Relay
8
Courtesy of NationalSwitchgear.com
2
.
AC
Operation
—
Adjustable
Block
the
KF
relay
contacts
closed
.
Energize
terminals
8
and
9
of
the
relay
with
rated
voltage
and
frequency
.
Time
the
clos
-
ing
of
the
telephone
relay
contacts
.
This
time
can
be
set
over
the
range
of
6
to
30
cycles
utilizing
the
rheostat
located
on
the
rear
sub
-
base
(
See
Figure
1
)
.
3
.
DC
Operation
-
Adjustable
Energize
terminals
10
and
4
with
rated
dc
voltage
.
Place
switch
across
KF
relay
con
-
tacts
.
Close
switch
and
time
the
closing
of
the
telephone
relay
contacts
.
Adjust
rheostat
on
rear
sub
base
for
desired
time
delay
.
This
time
can
be
set
over
the
range
of
6
to
30
cycles
utilizing
the
rheostat
located
on
the
rear
sub
-
base
(
see
Fig
.
1
)
.
A
(
T
)
i
B
TRIP
BUS
PCS
.
c
Hfr
91
:
o
*
1
1
«
0
T
±
T
ICS
-
T
T
J
®
I
2
x
KF
81
21
1
=
3
C
/
U
*
ICS
I
?
1
L
-
-
O
-
j
t
FRfcQUCNCT
ADJUSTING
REACTOR
120
V
SIC
.
S
2
a
d
k
>
—
*
*
RES
.
$
2
RENEWAL
PARTS
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
and
styles
from
the
Electrical
Parts
List
.
Sub
.
7
762
A
574
©
Fig
.
10
.
External
Connections
for
the
Type
KF
Underfrequency
Relay
with
AC
Operated
Auxiliary
Time
Delay
Unit
.
K F
RELAY
COUNTER
8
T
2
IP
BUS
POS
.
c
T
A
#
1
«
10
KVI
wr
-
'
1
T
"
L
_
J
=
fH
ICS
7
fT
fT
POWER
AMPLIFIER
OSC
.
LLATOR
TIMER
81
FREQUENCY
ADJUSTING
REACTOR
0
II
2
8
NEC
POS
POT
.
/
VYV
%
C
3
*
\
rO
—
If
-
c
/
u
TtMSF
.
ICS
125
V
D
C
SUPPLY
?
)
#
!
<
’
81
4
1
120
»
see
.
TEST
EQUIPMENT
±
se
«
LOW
DISTORTION
AND
STABLE
A T
LOW
FREQUENCY
(
6 0
H Z
)
OSCILLATOR
S
2
5 1
Tl
9
'
-
0
-
*
NEC
POWER
A M
P
L
i
F
1
E
R
-
5 0
W
ATT
-
L O
W
DISTORTION
$
2
ACCURATE
A T
LOW
FREQUENCY
(
6 0
H Z
)
CCUNTE
R
Sub
.
4
849
A
178
849
A
179
©
Fig
.
11
.
External
Connections
tor
the
Type
KF
Underfrequency
Relay
with
DC
Operated
Auxiliary
Time
Delay
Unit
.
Fig
.
12
.
Diagram
of
Test
Connections
for
KF
Relay
with
DC
Operated
Auxiliary
Time
Delay
Unit
.
10
Courtesy of NationalSwitchgear.com
I
.
L
.
41
-
503
N
ELECTRICAL
PARTS
LIST
STYLE
CIRCUIT
SYMBOL
REFERENCE
FREQUENCY
SENSING
CIRCUIT
-
FIG
.
2
,
3
,
4
1267285
606
B
340
H
07
606
B
340
H
04
290
B
179
G
04
750
ohm
,
25
W
,
+
5
%
.
225
MFD
,
750
VAC
,
±
3
%
2.0
MFD
,
330
VAC
,
+
3
%
RESISTOR
-
Rl
CAPACITORS
—
Reactor
Leg
Resistor
Leg
Reactor
AC
FIXED
6
CYCLE
TIMER
-
FIG
.
2
1600
ohm
,
25
W
,
+
5
%
68
MFD
,
35
V
,
+
20
%
1
N
4821
1267294
187
A
508
H
02
188
A
342
H
16
541
D
231
H
14
RESISTOR
(
R
2
)
CAPACITORS
-
(
3
In
Parallel
)
DIODES
-
(
Bridge
)
TELEPHONE
RELA
Y
(
T
)
AC
ADJUSTABLE
6
TO
30
CYCLE
TIMER
-
FIG
.
3
1267285
541
D
514
H
10
541
D
514
H
10
RESISTOR
-
(
R
2
)
POTENTIOMETER
TELEPHONE
RELAY
(
T
)
750
ohm
,
25
W
,
+
5
%
25
K
ohm
.
2
W
,
+
10
%
CIRCUIT
BOARD
ASSEMBLY
-
STYLE
691
B
182
G
01
184
A
661
H
03
184
A
661
H
21
184
A
663
H
04
188
A
342
H
12
Q
837
A
692
H
03
Q
184
A
763
H
39
184
.
A
763
H
03
187
A
290
H
13
184
A
763
H
55
184
A
763
H
51
184
A
763
H
19
629
A
453
H
01
629
A
435
H
01
848
A
851
H
02
849
A
441
HOI
629
A
798
H
03
CAPACITORS
-
Cl
47
MFD
.
35
V
,
±
20
%
6.8
MFD
,
35
V
,
+
5
%
0.1
MFD
,
50
V
,
+
20
%
1
N
5053
G
1
N
645
A
Q
3.3
K
'
/
2
w
,
+
5
%
100
ohm
,
Vi
w
,
+
5
%
33
Ohm
,
Vi
w
,
+
5
%
15
K
ohm
,
Vi
w
,
+
5
%
10
K
ohm
,
Vi
w
,
+
5
%
470
ohm
,
Vi
w
,
+
5
%
H
62
,
UTC
2
N
2647
,
UJT
2
N
3417
,
NPN
2
N
3645
,
PNP
1
N
2986
B
,
24
V
,
+
5
%
C
2
.
C
3
.
C
5
C
4
DIODES
-
D
1
,
D
2
,
D
3
,
D
4
D
5
,
D
6
,
D
7
,
D
8
.
D
9
RESISTORS
-
Rl
,
Rl
l
o
R
2
R
3
R
4
R
5
,
R
6
R
7
TRANSFORMERS
-
Tl
TRANSISTORS
-
Ql
Q
2
Q
3
ZENER
DIODES
-
Zl
DC
ADJUSTABLE
6
TO
30
CYCLE
TIMER
-
FIG
.
4
HD
95
HH
08
O
HD
95
HH
06
185
A
067
H
02
541
D
514
H
10
O
541
D
514
H
32
RESISTOR
(
R
2
)
420
-
2000
ohm
,
25
w
,
+
5
%
10
K
ohm
.
2
w
,
+
10
%
POTENTIOMETER
TELEPHONE
RELAY
(
T
)
CIRCUIT
BOARD
ASSEMBLY
-
STYLE
878
A
418
G
01
184
.
A
661
H
03
862
A
177
H
06
O
837
A
692
H
03
184
A
763
H
51
184
A
763
H
29
184
A
763
H
23
184
A
763
H
31
O
763
.
A
127
H
28
849
A
441
H
03
629
A
435
H
01
CAPACITORS
-
Cl
47
MFD
.
35
V
,
+
20
%
47
MFD
.
35
V
,
+
5
%
©
1
N
645
A
10
K
ohm
,
Vi
w
,
+
5
%
l
.
2
ohm
,
Vi
w
,
+
5
%
680
ohm
,
Vi
w
,
+
5
%
l
.
5
K
ohm
,
'
/
2
w
,
+
5
%
700
ohm
,
3
w
,
+
5
%
2
N
4249
,
PNP
2
N
2647
,
UJT
C
2
DIODES
-
Dl
,
D
2
,
D
3
,
D
4
RESISTORS
-
Rl
R
2
R
3
R
4
TRANSISTORS
-
Ql
Q
2
O
=
Old
=
New
629
A
798
H
01
ZENER
DIODES
-
Zl
1
N
2989
B
,
30
V
,
+
5
%
11
Courtesy of NationalSwitchgear.com
.
563
.
250
(
14.30
)
-
5.563
-
(
141.30
)
01
A
.
4
HOLES
FOR
.
190
-
32
MTG
.
SCREWS
(
6.35
)
K
6.063
*
[
(
154.00
)
1.594
(
40.49
)
2.781
-
(
70.64
)
f
t
}
L
5.219
(
132.56
)
9.063
(
230.188
)
9.688
(
246.08
)
i
4
-
4
“
f
4
4
-
4
,
4.531
(
115.09
)
4.844
(
123.04
)
10.438
(
265.13
)
i
1
i
$
h
.
125
-
2.938
(
74.63
)
-
3.188
(
80.98
)
R
.
'
I
(
3.18
)
h
—
5.875
(
149.23
)
k
6.375
-
*
J
(
161.93
)
PANEL
LOCATION
SEMI
-
FLUSH
MTG
.
PROJECTION
MTG
.
DIMENSIONS
IN
INCHESV
DIMENSIONS
IN
MMV
\
\
rU
\
RGE
INTERNAL
\
/
\
a
EXTERNAL
\
/
^
TOOTH
WASHER
\
—
SMALL
EXTERNAL
TOOTHED
WASHERS
.
PANEL
CUTOUT
8
DRILLING
FOR
SEMI
-
FLUSH
MTG
.
t
1.344
(
34.14
)
2.688
(
68.2
8
)
%
.
563
it
(
14.30
)
DIA
*
2
HOLES
-
5.375
(
136.53
)
4
+
.
0
I
6
C
.
397
)
Ci
250
n
(
6.35
)
“
°
H
.
03
I
-
H
.
03
I
—
H
.
03
I
-
H
.
03
I
-
1
(
26.19
)
(
26.19
)
(
26.19
)
(
26.19
)
1
»
|
>
|
.
1
.
190
-
32
SCREW
.
375
1.344
SPACERS
FOR
(
34.14
)
THIN
PANELS
(
9.53
)
R
PANEL
CASE
L
c
,
5
/
16
-
18
SCREW
,
q
4
(
FOR
THICK
PANELS
(
ik
09
)
USE
5
/
16
-
18
STUDS
;
—
r
—
-
INTERNAL
-
EXTERNAL
TOOTHED
WASHERS
.
190
-
32
SCREW
FOR
THICK
PANELS
USE
.
190
-
32
STUDS
7
1
/
)
1.0
•
/
(
25.4
)
^
)
i
n
3
5
A
77
9
1.813
i
2.0
(
46.05
)
i
(
50.8
)
<
2
10
V
4
6
8
±
\
j
=
i
Ifr
—
.
516
(
13.11
)
1.031
—
K
1.031
(
26.19
)
(
26.19
)(
26.19
)
(
26.19
)
.
750
TERMINAL
NUMBER
DIA
.
(
19.05
)
10
HOLES
OR
CUTOUT
PANEL
DRILLING
OR
CUTOUT
FOR
PROJECTION
MTG
.
(
FRONT
VIEW
)
-
1.031
—
-
1.031
.
641
TERMINAL
AND
MOUNTING
DETAILS
DIA
.
(
16.28
)
57
-
D
-
7901
Fig
.
13
.
Outline
&
Drilling
Plan
for
the
Type
KF
Relay
in
Type
FT
21
Case
.
ABB Network
Partner
A
nil
MIPIP
ABB
Power
T
&
D
Company
Inc
.
4300
Coral
Ridge
Drive
Coral
Springs
Florida
33065
(
954
)
752
-
6700
FAX
:
(
954
)
345
-
5329
Printed
in
U
.
SA
Courtesy of NationalSwitchgear.com
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