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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