Dynamic Backlash Compensation; Description Of Functions - Siemens SINUMERIK 840D sl Function Manual

K3: Compensations
5.3 Backlash compensation
5.3.2

Dynamic backlash compensation

5.3.2.1

Description of functions

Dynamic backlash
A dynamic backlash can occur for machine types with sliding guides. Depending on the axial
dynamic response (velocity, jerk, etc.) used to approach an end position, the machine slide
reaches the programmed end position or stops earlier because of the static friction. The
resulting position error is direction-symmetric.
Compensation
To compensate for the dynamic backlash, half the signed compensation value
(MD32456Commissioning: Axis-specific machine data (Page 263), see "") is applied in
accordance with the relevant traversing direction of the axis. Compensation value is applied
as ramp.
Activation
The dynamic backlash compensation is activated by the PLC only in required the situations:
DB31, ... DBX25.0 (activate dynamic backlash compensation)
Note
The machine tool manufacturer specifies in the PLC user program the "required" situations for
the activation of the dynamic backlash compensation. Such situations result with traversal of
the axes with G1, in the JOG mode or with the handwheel.
The NC uses the following interface to return the required activation to the PLC:
DB31, ... DBX102.0 (active dynamic backlash compensation)
Requirement
The axes to be compensated must be homed.
Display
The compensation value that belongs to the current actual position is displayed in the
"Diagnostics" operator area of the "Axis/Spindle Service" window as the total compensation
calculated from LEC, mechanical and dynamic backlash compensation.
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions