Technological Features Of Clearance Control - Siemens SINUMERIK 840D sl Function Manual

TE1: Clearance control - 840D sl only

15.3 Technological features of clearance control

The meaning of the individual positions of the machining head is as follows:
1. Programmed position of the machining head
2. Actual position of the machining head with clearance control active before the orientation
change
3. Programmed position of the machining head after the change in orientation
4. Actual position of the machining head with clearance control active after the orientation
change
The machining head movement visible on the machine when the change in orientation takes
place is direct from position 2 to position 4.
15.3 Technological features of clearance control
Clearance control is characterized by the following technological features:
● Dynamic Response
The overlaid sensor motion uses the current residual dynamic response that is still in
reserve after the programmed axis motion (velocity and acceleration). The proportion of
residual acceleration that must be used can be set as a percentage in a machine data.
● Sensor characteristic
The gain characteristic of a sensor can be defined with up to 10 interpolation points.
● Sensors
Two sensors with different gain characteristics (e.g. a mechanical and a capacitive sensor)
can be used simultaneously. The active sensor characteristic can be switched over block-
synchronously by means of a language command in the part program.
● Closed-loop control gain of clearance control
The closed-loop control gain configured in the NC machine data for clearance control can
be changed block-synchronously by means of a language command in the part program.
● Motion limitation
The lower and upper limits configured in the NC machine data for the axis movements
induced by clearance control can be changed block-synchronously by means of a language
command in the part program.
An alarm appears when a limit is reached. The alarm response (stop all traversing
movements or display only) can be parameterized. The current position offset can be frozen
by means of a PLC signal.
● Response on deactivation
The deactivation response of the clearance control function can be programmed either for
synchronization with the current axis positions (no compensating movement) or for
compensating axis movements to the last programmed axis positions (axis positions
without clearance control).
● Programmable clearance setpoint
An additional voltage value can be programmed in order to alter the setpoint distance set
in the sensor electronics on a block-related basis.
572
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions