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

Basic operating modes
Swivel angle
P-0-2972
command value
[%]
Pressure
P-0-2803
command value
Actual value acquisition
Actual swivel
S-0-0882
angle value
Derivation swivel
P-0-2958.0.1
angle feedback
value
Actual pressure
S-0-0809
value
Derivation pressure
P2957.0.6
feedback value
Product description | SYDFED-2X, SYDFED-3X, SYHDFED-1X
5.3

CONTROL OF THE SY(H)DFED CONTROL SYSTEM

Up to two controllers are continuously active in the possible operating modes:
• Swivel angle controller or flow controller
• Pressure controller
These controllers alternate automatically and jerk-free through the changeover
logic.
The controller, the actual value of which comes closest to the command value,
takes over control.
In general, for the transition of a system from a given initial state to a given final
state, a fast transition and steady state are envisaged. To meet this requirement,
various control algorithms are used in closed-loop control technology.
The digital SY(H)DFED control is provided with 4 controller parameter sets
for optimum adjustment to system-specific requirements. For this purpose,
up to 4 instances of the parameters relevant for controlling are created in the
HydraulicDrive after the relevant controller parameter set was activated. The
setting of the individual controller parameters depends on the control properties
of the entire system. The following factors must be taken into account for this:
• Hydraulic structure of the system (e.g. piping, branches)
• Connected oil volume
• Current drive speed
For a detailed description of the additional function "variable-speed
operation", please refer to the supplementary description RE 30237-Z. This
document also contains commissioning notes on variable-speed operation.
5.3.1

Structure of the control

The following control structure is used in the HydraulicDrive:
Swivel
Schwenk-wi
nkel-
angle
Sollwert-
command
Bearbeitung
value
processing
P-0-2956 P2953
[%]
Schwenk-wi
Swivel
nkel-
Sollwert- angle
Bearbeitung
controller
[bar]
Schwenk-wi
[%]
nkel-
Pressure
Sollwert-
controller
Bearbeitung
[%]/s
[bar]
[bar]/s
Fig. 6: Overview of controllers in parallel structure
[%]
P-0-2953 P2953
Schwenk-wi
Change-
nkel-
Sollwert- over logic
Bearbeitung
of pump
P-0-2955 P2953
P-0-2954 P2953
[%]
RE 30017-B, Edition 11.2021, Bosch Rexroth AG
Schwenk-wi Schwenk-wi
Control
nkel- nkel-
variable
Sollwert- Sollwert-
Bearbeitung Bearbeitung
adjustment
of pump
P-0-2914
[%]
21/96
Valve
controller