Piston Calibration - Siemens SINAMICS S120 System Manual

4.18.7

Piston calibration

Piston calibration is required for the following actions:
● Velocity controller adaptation
● Force controller
● Friction pulse
● Automatic characteristic measurement
Piston calibration is not required for all other traversing motion.
Automatic piston calibration
The piston can be calibrated within the scope of the valve characteristic measurement (see
Chapter "Measurement (Page 87)").
If, in an exceptional case, this automatic calibration function is not sufficient, then you can
manually perform the fine calibration. This fine calibration is described below.
Piston calibration using absolute measuring systems
The piston position can be determined and the piston calibrated almost completely
independently in the drive without any additional information from the control system.
Determining machine position A
1. Retract the piston → piston is at position A
– The traversing block to retract the piston comes from the control system
2. Calibrate (p1909.1 = 1)
– Event using a parameter task as part of commissioning, can be repeated when
– Encoder measured value G1_XIST1: Transfer absolute position as machine position A
Determining the piston position
1. Ramp-up
2. Determining the absolute encoder position
3. Calculate the actual piston position from the actual absolute encoder position
4. Track the piston position for traversing motion
Hydraulic Drive
System Manual, 04/2015, 6SL3097-4BA00-0BP1
required.
for the drive → the drive saves the assigned encoder position as piston position A.
Commissioning
4.18 Fine calibration and tuning
121