72/104 Commissioning
Bosch Rexroth AG, A4... with HS5E pilot control valve/Series 3x, RE 92076-01-B/10.2017
8.1.7.3 Dead volume
Table 20: Dead volume
Parameters Designation
P-0-2813 Pressure controller dead volume
You use this parameter to specify the dead volume of the system. The dead volume
is calculated as the oil volume that is in the system between the pump and the
consumer. The behavior of the pressure controller depends on the dead volume. This
means that you must always enter the current dead volume on this parameter.
8.1.7.4 Setting value of integrator
Table 21: Setting value of integrator
Parameters Designation
P-0-2806.0.4 Pressure controller integration time
P-0-2806.0.6 Pressure controller accuracy window of integrator
P-0-2812 Pressure controller derivation of actual pressure value feedback
of integrator
There are various parameters for setting the integrator. In this connection, the
integration time corresponds approximately to the regulating speed of the pump
system. In the pressure controller, there is a path for the integrator with feedback
of the change in pressure. This makes it possible to limit the integration value at
transitions.
If the actual pressure value is in the range of the accuracy window by the pressure
command value, the integrator value is not adjusted any more.
8.1.7.5 D component
Table 22: D component
Parameters Designation
P-0-2816 Pressure controller of cascade factor of D component positive
P-0-2817 Pressure controller of cascade factor of D component negative
P-0-2978 Swivel angle controller time constant D component
The D-component scales the change of the actual value signal and ensures a
damped transient response of the pressure or swivel angle controller. Differentiation
results in very high sensitivity, which also responds to undesirable signals such as
interference and can make the system unstable. In the case of a constant actual
value, the D-component does not respond, since the change rate is zero. The higher
the D-component, the slower is the system’s response.
With the cascade structure, the D component is only used to increase damping in
the controller on an as required basis.
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