SH-HC30 Height Controller System Manual
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9. Description of initial positioning function
9.1 Positioning mode
The impact position switch is set in the height controller. When the cutting gun moves down and collides
with the cut workpiece, the internal switch is turned on without the need of special cutting gun and
"protection cap". Electrical loop must not be formed between the "protection cap" and the workpiece. This
approach applies to any plasma cutting gun.
How to use the positioning function: in the plasma mode, the signal of "manual down" of the external
control interface is valid. When the cutting gun moves down and collides with the steel plate, the internal
switch is turned on. It returns up to a certain height by automatic control of the height controller, and then
positioning is completed.
9.2 Positioning height setting
Parameter value B is the positioning height, unit: mm; note when detection collision occurs, overmuch
walking and certain deformation of workpieces and cantilever occur, so value B is generally set within
5-12mm.
9.3 Process
This function does not require additional relevant processes and instructions by the numerical control
system. It only needs to extend the time for falling of the cutting gun. Generally, the time for the falling of
the cutting gun is longer than its rise; 2-6 seconds are OK.
Before NC implements the perforating process, the cutting gun will rise or fall. Because the falling time will
be longer than that of rise, and then the cutting nozzle may collide with the workpiece, at this time, the
height controller can detect the collided workpiece and will return up to a certain distance immediately, thus
the initial positioning is realized. Note even if the falling signal for the cutting gun has not been removed by
NC system, the cutting torch will not continue to fall, waiting for falling delay of the cutting gun of NC to end.
Why special attention should be paid to the collection of arc voltage? Because even
the plasma power of different manufacturers cuts in the same environment, the arc
column voltage is not necessarily the same. Fill in parameters A with the test results
(see control parameters 7.1). If the value A is not tested, the current value is smaller
than the current actual voltage for plasma power cutting, then the plasma cutting
gun will fall rapidly until it collides with the workpiece in automatic cutting, if not, it
will always rise until the arc breaks.
For the new plasma power that is newly used and is not familiar, when it is equipped
with the height controller for the first time, the actual starting arc testing must be
made for the actual arc voltage of the plasma power supply. The normative power
supply may be based on the "cutting speed chart" provided by the supporting
instruction book by plasma power supply.
Simple test method: adjust the distance of the cutting torch and steel plate to the
appropriate value manually (according to the power process requirements). In the
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