
6.TRACING CONTROL LASER FUNCTION B-64663EN/01
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Polarity of the sense signal
The sensor should be designed to send a 0-V sense signal when the
nozzle is at the reference distance (L
0
) position and then output
voltage in proportion to any shift from the reference position. Positive
voltage should be output when the nozzle approaches the workpiece
from the reference distance position.
Negative voltage should be output when the nozzle leaves from the
reference distance position.
Level of the sense signal
As a sense signal, +10 VDC or -10 VDC must be sent to the CNC
when the nozzle has moved away from the reference position by 2 mm
in either the approach or retreat directions.
When the signal output by the sensor is not of the required level, a
gain adjustment circuit must be provided.
Clamp the output of the sensor so that the voltage applied to the CNC
does not exceed ±10 V.
Resolution of the sense signal
When a voltage of ±10V is input for shifts of ±2mm, CNC reads the
shift with a minimum resolution of 0.001 mm with the aid of an A/D
converter.
Selection of the sense signal level
The standard shift is ±2mm, for which as voltage of ±10 is output.
However, for applications where a larger sensing stroke is required,
the parameter No. 15504 is provided:
Shift Sense signal voltage Resolution
±2mm ±10V 0.001mm
±4mm ±10V 0.002mm
±6mm ±10V 0.003mm
±8mm ±10V 0.004mm
±10mm ±10V 0.005mm