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SYDFED-2X, SYDFED-3X, SYHDFED-1X
| Product description
Bosch Rexroth AG, Edition 11.2021, RE 30017-B
The parallel structure with pressure controller and swivel angle controller is called
in the operating mode “pressure/swivel angle control” or “pressure/flow control”.
The swivel angle command value is adjusted in swivel angle command value
processing before it is passed on to the actual swivel angle controller.
In pump control the pressure and the swivel angle controller are simultaneously
active and both generate an actuating value. In standard cases, the changeover
logic of the pump passes on the smallest control variable of both controllers
(minimum value comparator function). This minimum value comparator ensures
that always only one of the two variables of pressure or swivel angle is used for
controlling and that it is possible to switch dynamically between the two control
types. The output variable of the pump changeover logic can be modified using
various characteristic curves and functions in output adjustment of the pump
before the variable is handed over to the valve controller as valve command value.
5.3.2 Controller parameters
The following controller parameters are involved in pressure and swivel angle
control:
Table 6: Controller parameters
Description of the controller parameter
Parameter number
Pressure controller P-gain 1 positive
P-0-2963
Pressure controller P-gain 1 negative
P-0-2964
Pressure controller pos. factor for D-component, parallel
P-0-2969
Pressure controller neg. factor for D-component, parallel
P-0-2970
Pressure controller time constant swivel angle feedback
P-0-2971
Gate time derivation actual pressure value 1
P-0-2960
Gate time derivation actual pressure value 2
P-0-2979
Swivel angle controller P-gain
P-0-2977
Swivel angle controller time constant D-component
P-0-2978
Time constant for feedback of actual pressure value derivative
P-0-2974
Filter time for feedback of actual pressure value derivative
P-0-2973
After the extended pressure controller with inflected characteristic curve was
activated, the following controller parameters are active additionally:
Table 7: Controller parameters
Description of the controller parameter
Parameter number
Pressure controller P-gain 2 positive
P-0-2965
Pressure controller P-gain 2 negative
P-0-2966
Pressure controller control deviation threshold positive
P-0-2967
Pressure controller control deviation threshold negative
P-0-2968
5.3.3 Controller parameter sets
The SY(H)DFED control system offers the possibility of configuring and using up
to four different parameter sets. With the help of these parameter sets the control
behavior of the SY(H)DFED control system can be optimized to suit different
connected oil volumes. The following table lists various settings as guideline for
the controller parameters in conjunction with different oil volumes:
