调高器说明书
9 Description of initial positioning function
9.1
Positioning mode
An impact position swit
ch is designed in the height controller. When the cutting torch
moves down and
knocks workpiece, the internal switch will be turned
on with no need of
special cutt
ing torch or "protective cap" which requires no
electrical loop is formed
between the "protection cap" and the workpiece. This approach
applies to any plasma
cutting torch.
How t
o use the positioning funct
ion: in plasma mode, the signal of "manual descending"
from externa
l control interface is valid. When the cut
ting
torch
moves down and knocks
work piece, the internal switch will be t
urned on, which will automatically control t
he
cutting torch back up to a certain height to complete positioning.
9.2 Setting of positioning heig
ht
Parameter value
B
is used to control the
positioning height in mm. Considering the
possibility of overt
ravel and deformation of workpieces or cantilever when impact
occurs,
,
value B is generally set within 5-12mm.
9.3 Process
This
function
does
not
require
additional
relevant
processes
and instructions by the CNC
system.
It
only needs to
extend the descending
time of
the cut
ting torch in
the CNC
system.
Generally,
the
descending
time
of
the
cutting
torch
is
set
2-6
seconds
longer
t
han
the
ascending time.
Before
CNC
implements
perforating
process,
t
he
cutting
torch
will
move
up
and
down.
Because
the descending time is
longer
than
ascending
time,
the
cutting
nozzle
may
knock
the
workpiece;
at
this
time,
the
height
controller
can
detect
the
impact
and
will
ret
urn
up
to
a
certain
height
immediately
to
acquire
the
initial
position.
Note
should
be
t
aken
that
even
if
the
descending
signal
for
the
cutting
torch
has
not
been
cancelled
by
CNC
system,
the cutting
torch will not
descend any more but wait for
the descending delay of the cutting
torch to end.
9.4 Collection of initial arc voltage (for setting of value A)
The reason why arc voltage sho
ld be particularly collected in the
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