Clearance Control; Control Dynamics - Siemens SINUMERIK 840D sl Function Manual

TE1: Clearance control

11.2 Clearance control

11.2 Clearance control
11.2.1

Control dynamics

Closed-loop control gain Kv
The dynamic response of the closed control loop (sensor - open-loop control - axis) is
determined by the maximum closed-loop control gain Kv.
The closed-loop control gain Kv is defined as:
Clearance control characteristics
Clearance control is based on the two characteristics shown in the following diagram:
• Clearance sensor characteristic (sensor property)
• Clearance control characteristic (can be parameterized via machine data)
Figure 11-3 Correlation between characteristics: Clearance sensor and clearance control
• The clearance sensor measures the actual distance from the workpiece surface and
returns as its output variable a voltage in [V], which is almost directly proportional to the
distance.
• The clearance control function uses the parameterized voltage/velocity characteristic from
the voltage provided by the clearance sensor to calculate a compensatory velocity for the
clearance-controlled axes that is appropriate for the clearance.
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions