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BRUEL & KJAER System V - Start-Up Procedure

BRUEL & KJAER System V
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Head, a
push
rod is
generally
used
to
transfer
the
force.
This
can
also be used
to
provide
3.11
externai
protection
for
the
Head. The
dimensions
and
stiffness
of
the
rod
should
be
de-
si
gned
in
such
away
that
side loads
and
moments
result
in
bending
of
the
rod
rather
than
rubbing
of
the
side
load
pads.
5
mm
St
ee
l Rod
Si
lver
So
lder
10
·
32
UNF
/
I
~
e
(]}
M 3
Sc
r
ews
(al
/ H
ose
Clamp
A luminium T ube
,(t):E
~
10
·32 UNF
Sl
ot
Fig.
3.7.
(bl
271
4
01
Push
rads
for
use
with
the
Mode
Study
Head
3.1
3.1
Fig .3 .7
shows
sketches
of
two
types
of
push
rods
for
use
with
the
Type
4814
Head. In
a)
the
two
halves
are
screwed
tight
to
the
Exciter Head
and
the
object,
then
locked
to-
gether
by
means
of
the
four
centre
screws
. In
b)
a
slotted
aluminum
tube
is
slipped
over
the
two
10
-
32
UNF
screws
,
then
clamped
in
place
with
small
hose
clamps.
This
is
only
suitable
for
applications
at
frequencies
below
500
Hz.
3.10.
START-UP
PROCEDURE
This
section
assumes
the
Exciter
system
is
powered
by
the
2707
Power
Amplifier
driven
by a
suitable
signal
source.
Before
the
Exciter
is
turned
on,
all
actions
discussed
in
sec-
tions
3 .1
to
3.8
should
have
been
completed.
Set
the
CURRENT
LIMIT
and
DISPLACE-
MENT
LIMIT
controls
according
to
the
characteristics
of
the
Head
employed
. For
the
4805
without
cooling,
the
CURRENT
LIMIT
on
the
power
amplifier
should
be
set
to
half
the
value
stated
on
the
Head .
The
AMPLIFlER
GAIN
controi
should
be
in
its
"
Reset"
posi-
tion
. EXCITER INTERLOCK
should
be
"In".
3.1
To
turn
on
the
Exciter,
turn
the
POWER
switch
on
the
Power
Amplifier
clockwise
to
"
Power
On",
and
af
ter
a
one
second
pause,
further
clockwise
to
"Load
On
".
The
"
Power
On"
position
turns
on
the
power
supplies
in
the
Power
Amplifier
and
the
Field
Supply
and
Blower
Motor
in
the
Exciter
Body Type
4801
.
The
"Load
On
"
position
conn
ects
the
driver
coil
of
the
Exciter
Head.
The
one-second
pause
prevents
starting-transients
from
causing
motions
of
the
moving
element.
3.
Confirm
that
the
signal
source
connected
to
the
input
to
the
Power
Amplifier
is
correctly
adjusted
.
Turn
the
AMPLIFlER
GAIN
controi
from
the
" Rese
t"
position
slowly
clockwise
until
the
desired
amplitude
of
vibration
is
reached
. A
counter
-
clockwise
turn
and
click
to
the
"Reset"
position
resets
the
protective
circuits
and
connects
the
signal
source
to
the
Power
Amplifier
if
some
abnorma
I use
has
tripped
off
one
of
the
protective
circuits
.
24

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