VTK
‐
VS
‐
BA
‐
004e
‐
B
|
User
Manual
MDS
3200A
|
Maintenance
59
9
MAINTENANCE
9.1
Maintenance
Indicator
The
integrated
“Cycle
Count“
function
relates
to
the
valve
as
a
whole
and
is
predetermined
by
the
manufacturer.
As
soon
as
the
preset
number
of
cycles
is
complete
(100
%),
the
red
“maint”
LED
on
the
control
panel
is
lit.
The
manufacturer
(or
an
authorized
subcontractor)
has
to
be
informed
at
once.
In
between,
you
can
inspect
the
current
state.
Use
the
function
“Maint.
Cycle”
in
the
sub
‐
menu
“Status”
(see
chapter
4.3.4).
The
result
is
visualized
by
eight
bars
on
the
screen,
each
of
them
representing
12.5
%
of
the
final
value.
Additional
cycle
numbers
can
individually
be
agreed
for
tappet
and
nozzle
insert.
In
factory
settings,
the
value
of
“Infinite”
is
assigned
to
both
of
the
targets.
If
the
user
wishes
to
enter
a
particular
value,
proceed
as
follows,
starting
from
the
first
menu
level:
1x
[Right
Arrow]
‐
key
=
Indicates
the
interval
for
exchange
of
the
nozzle
insert
2x
[Right
Arrow]
‐
key
=
Indicates
the
interval
for
exchange
of
the
tappet
To
enter
a
desired
final
value,
you
have
to
use
the
functions
“Set
Nozzle”
for
the
nozzle
and
“Set
Tappet”
for
the
tappet.
They
are
located
in
the
submenu
“Status”.
Results
are
also
dis
‐
played
in
the
form
of
8
bars,
each
of
them
representing
12.5
%
of
the
total
value.
Once
100
%
are
reached,
the
red
“maint”
LED
is
lit.
The
corresponding
item
(nozzle
or
tappet)
has
to
be
exchanged.
After
the
exchange
you
have
to
reset
the
corresponding
counter
to
“0”.
Use
the
functions
“Reset
Nozzle”
or
“Reset
Tappet”
in
submenu
“Status“
(see
chapter
4.3.4)
.
9.2
Exchange
of
Tappet
Sealing
For
replacement
of
seals,
a
particular
counter
is
not
provided,
as
the
necessity
depends
on
current
applications,
substances
to
be
dispensed
etc.
Some
materials,
caused
by
the
tappet
movement,
tend
to
penetrate
between
tappet
and
sealing.
This
is
giving
rise
to
abrasion,
so
that
the
sealing
has
to
be
inspected
from
time
to
time.
Continuously
working
with
damaged
sealing
inevitably
entails
unexpected
interrup
‐
tions,
loss
of
material
and
an
increased
need
of
cleaning.
In
some
cases,
even
the
actuator
can
be
damaged,
due
to
the
ingress
of
liquid.
The
tappet
sealing
is
exchanged
as
follows:
Step
1:
The
dispensing
process
must
be
completed.
The
valve
is
in
closed
position.
Step
2:
Close
the
compressed
air
supply.
Step
3:
Remove
the
nozzle
unit.
Step
4:
Disengage
the
fluid
box
as
follows:
Loosen
the
two
fastening
screws.
Carefully
draw
off
the
fluid
box
from
the
tappet.
The
fluid
box
meanwhile
should
not
be
jammed,
otherwise
the
tappet
can
break.
Step
5:
Use
the
“Sealmounter“
end
of
tool
MDT
301
to
squeeze
out
the
tappet
sealing
and
the
tappet
centering
piece.
Alternatively
the
thick
end
of
tool
MDT
304
can
be
used
for
this
purpose.
Step
6:
To
mount
the
centering
piece
together
with
the
new
sealing,
proceed
as
follows:
First
pin
up
the
tappet
centering
piece
on
the
mandrel
of
the
“Sealmounter”
end
of
tool
MDT
301.
Then
place
the
new
sealing
to
the
mandrel
as
well.
The
face
with
the
lower
diameter
points
upwards.
Press
both
elements
together
into
the
fluid
box
(still
using
MDT
301)
.
Step
7:
The
fluid
box
has
to
be
reinstalled
as
follows:
Carefully
push
the
fluid
box
onto
the
tappet.
Make
sure
not
to
jam
it.
Attach
and
tighten
the
two
screws
removed
beforehand
(Required
torque:
1.2
Nm
–
1.4
Nm).
Step
8:
Refix
the
nozzle
unit
to
the
fluid
box.
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