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

11.3

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 configured. 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.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
11.3 Technological features of clearance control
TE1: Clearance control
467