Calibrating The Sy(H)Dfed Control System - Bosch rexroth SYDFED 2X Series Manual

70/96 SYDFED-2X, SYDFED-3X, SYHDFED-1X | Commissioning
Bosch Rexroth AG, Edition 11.2021, RE 30017-B
8.1.8.6 Feedback of actual pressure derivative
Table 24: Feedback of actual pressure derivative
Parameter Designation
P-0-2973 Filter time for feedback of actual pressure value derivative
P-0-2974 Time constant for feedback of actual pressure value derivative
In the case of low-frequency systems, e.g. cylinders with long strokes or large
moved masses, poorly damped vibrations can occur in SWA control. By feeding
back the derivative of pressure this vibration can be actively dampened. To this
end, the derivative of pressure with negative sign is added to the swivel angle
command value. For the derivation of pressure the gate time is used and the value
is then filtered using P-0-2973.
In the condition as supplied, the feedback of the pressure derivative is set to the
default value of 0, i.e. the function is disabled.
8.1.8.7 Feedforward control factor for slave
Table 25: Reducing the swivel angle difference between master and slave
Parameter Designation
P-0-2984 Output adjustment, scaling feedforward positive
P-0-2985 Output adjustment, scaling feedforward negative
The displacement can be increased by coupling several SY(H)DFEx pumps. In
order that this SY(H)DFEx system operates approximately synchronously, the valve
command value of the master can be provided as feedforward value for the slaves.
This reduces the swivel angle difference between master and slave.
Detailed information about the setup of master/slave operation can be found in
chapter 5.9 "Master/slave operation" from page 33 onwards and the functional
description "HydraulicDrive".
8.1.9

Calibrating the SY(H)DFED control system

With the help of regular calibration with the calibration functions of the SY(H)
DFED control system, stable system characteristics can be achieved, because long-
term drifts are compensated for.
For the calibration of the SYDFED control system we recommend the following
order:
1. Calibration of pressure transducer
2. Calibration of valve
3. Calibration of swivel angle sensor offset
4. Calibration of swivel angle sensor gain
5. Calibration of leakage compensation
Further details on the configuration and activation of calibration functions can be
found in the description of the HydraulicDrive firmware.
The individual calibration functions can be started via IndraWorks and the dialog
"Pump controller calibration".