ABB 15VHK500 - Page 9

ABB
IB
6.2
.
7.7
.
-
1
Page
9
A
3
EA
BROWN
BOWER
!
with
bell
ringer
)
.
Retract
adjusting
screw
until
switch
con
-
tacts
“
make
”
,
then
rotate
adjusting
screw
one
turn
more
.
(
Adjusting
screw
is
self
-
locking
.
)
required
.
1
/
4
turn
of
the
pushrod
(
2
)
will
change
the air
gap
by
approx
.
.
019
.
After
rotating
the
pushrod
,
carefully
reposition
the
moving
contact
and
pushrod
vertically
to
align
the
pin
holes
.
Replace
the
pin
and retainer and
remove
the
temporary
spacer
.
During
the
readjustment
procedure
note
that
the
contact
wipe
and
air
gap
dimensions
,
specified
previously
,
must
be
maintained
.
Also
,
that
no
more
than
1
/
2
turn
total
of
the
pushrod
should
be
required
when
readjusting
for
contact
sequence
.
After
completing
the
contact
sequence
procedure
,
recheck
the
contact
wipe
and air
gaps
.
The
front
cover
and
interphase
barrier
assembly
can
now
be
reinstalled
-
Return
the
racking
screw
to
its
original
position
by
turning
it
counterclockwise
approx
,
two
to
three
turns
until
it
stops
.
Racking
Mechanism
(
See
Fig
.
7
)
The circuit
breaker
racking
mechanism is
adjusted
for
proper
operation
and
should
not
be disturbed
unless
it
becomes
possible
to
close
the
breaker
during
a
racking
operation
.
It
may
be
possible
that interlocked
blocking
members
are
not
positioned
properly
,
which should be corrected
as
follows
:
Remove the
lowerfront
mechanism
coverplate
and
with
the
circuit breaker closed
,
make
adjustments by regulating
the
length
of
connecting
rod
(
1
)
for
1
/
32
inch minimum
to
3
/
32
inch maximum
clearance
of
“
A
”
between
trip
link
(
3
)
and
blocking
lever
(
2
)
.
The maximum
adjustment
at
point
“
A
"
should
not
exceed
3
/
32
inch
.
Closing
and
Opening
Times and
Speeds
After
the
operation
intervals noted
previously
,
the
closing
and
opening
times
are
recommended
to
be
checked
by
use
of
a
cycle
counter
,
travel recorder
,
oscillograph
,
etc
.
to
monitor
the time
from
energizing
to contacts
touch
or
part
.
*
A
potentiometer
with
mounting
support
,
used
in
conjunc
-
tion
with
an
oscilloscope
or
oscillograph
,
and instructions
are
available
on
special
order
for
specifically
checking
opening
and
closing
speeds
.
The circuit breaker
closing
and
opening
times should be
within
the
following
time
ranges
for
normal
operation
.
Control
Relay Adjustment
(
See
Fig
.
8
)
The control
relay
does
not
normally
require
any
adjustment
in
the
field
.
However
,
if
necessary
adjust
the
gap
between
the control device lever
adjusting
screw
and the
limit
switch
crank
arm
for
a
1
/
64
—
1
/
32
gap
with
the
closing springs
charged
.
With
the
closing springs discharged
,
the
gap
between
the lever
stop
and the lever should be
1
/
64
"
to
1
/
16
"
.
Closing
Time
Opening
Time
Range
—
MS
Range
—
MS
UV
(
M
AQJ
.
scn
«
w
AMO LOCK
NUT
CONTROL
40
-
60
25
-
35
NOTES
:
1
.
Below
0
°
C
,
the
closing
times
will
increase
(
but
wilh
no
reduction
in
closing
force
)
,
and
opening
times
will
be
within
the
limits
.
2
.
Adjustments
to
correct
speeds
,
if
found
to
be
outside
limits
,
are
critical
and the
nearest
District
Office
should be
contacted
for
recommendations
.
LEVER
5
TOA
Operating
Mechanism
(
See
Fig
.
6
)
The
operating
mechanism
is
adjusted
at
the
factory
for
proper
operation
and should
not
be disturbed unless the
circuit breaker does
not
close
electrically
on
reclosing duty
.
This condition is caused when the latch check switch
(
when
used
)
is
not
actuated
.
Circuit
breaker should
not
close
before
trip
latch
(
4
)
has
reset
.
Adjustments
should be made
with
latch
(
4
)
against
reset
stop
pin
(
3
)
.
Turn
in
adjusting
screw
(
1
)
until
contacts
of
switch
(
2
)
“
break
”
(
as
indicated
by
an
audible click
or
check
LIMIT
SWITCH
CHANK
CONTROL
DEVICE
Fig
.
B
Control
Relay
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