
B-64663EN/01 LASER FUNCTION 6.TRACING CONTROL
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Sensor performance
Tracking accuracy depends on the linearity of the sensor. So, use only
a sensor having extremely high linearity.
The frequency characteristics of the amplifier and sensor greatly affect
the response of the tracing control system. So, use only a sensor and
amplifier having extremely good frequency characteristics (with a
frequency band of 30 Hz or wider).
Mount the sensor such that it is mechanically secure, and not subject
to vibration.
Also pay attention to the rigidity, lost motion, and resonance of the
drive system of the tracing axis.
Tracking speed
The tracking speed of tracing is equal to the loop gain multiplied by a
shift.
Vz=60×K× (∆E-E0)
where,
Vz : Tracking speed (mm/min)
K: Tracking speed voltage conversion coefficient
∆E: Amount of shift (mm)
E0: Standard shift (mm)
When the nozzle is lifted away the workpiece, the amount of shift
assumes the maximum negative value, such that the value of Vz
becomes extremely high.
In this case, the nozzle approaches the workpiece at high speed.
Parameter No. 15553 can be used to clamp this speed.
CAUTION
While an axis is assumed a tracing axis, do not
issue move commands using a program or
manually.
Signal
- Tracing start signal
TCST<G225#3>
[Classification] Input signal
[Function] Tracing is started and stopped using an external signal.
[Operation] Tracing is performed while this signal is 1.
To set this signal to 0 using an M code, set this M code as an M code
without buffering.
- Tracing motion signal
TRCL<F220#2>
[Classification] Output signal
[Function] This signal informs the PMC that tracing is in progress.
[Output condition] This signal is set to 1 in the following case:
- When nozzle approach is assumed to have been completed, with
the nozzle having approached to within a certain distance from
the workpiece after the start of tracing