Speed Adaption
The speed adaptation is at the core of the "Sytronix-DRn" function and in op‐
eration at partial load allows reducing the pump speed in an intelligent way.
Fig. 7-20:
Principle of DRn speed adaptation
The underlying principle consists in providing a preferred command value for
the pump swivel angle. The speed adaptation has been designed as a PID
controller and can be configured via the following parameters.
Code
Name
Setting Range
Default
Attri.
F1.08
Preferred swivel angle command source
0: Swivel angle command of
F1.09
1: Communication
0
Stop
F1.09
Command value: Preferred swivel angle
0.00...100.00 %
70.00
Run
F3.12
Speed adaptation: P-gain
0.0...1,000.0 rpm/%
0.0
Run
F3.13
Speed adaptation: I-gain
0.0...1,000.0 rpm/%/s
50.0
Run
F3.16
Speed adaptation: D-gain
0.00...100.00 rpm/%*s
0.00
Run
F3.21
Speed adaptation: Ramp pitch, ascending
0...10,000 rpm/s
1,000
Run
F3.22
Speed adaptation: Ramp pitch, descending
-9,999...0 rpm/s
-800
Run
Tab. 7-3:
Parameter list of speed adaption
F1.08 Preferred swivel angle command source
This parameter sets the preferred swivel angle command source for the
speed adaptation.
F1.09 Command value: Preferred swivel angle
The aim of the speed adaptation is to reach the preferred swivel angle com‐
mand for the DR/DRG pump. In practice it is recommended to set this param‐
eter to values that are smaller than 80% to give the pressure control a head‐
room for its control actions. The value 70% is a good point to start with. If you
want to achieve better energy efficiency the user can experiment with differ‐
ent values here. It all comes down to the load flow and the set-point pressure.
The values for the majority of the systems will be in the range 40%...70%.
F3.12 Speed adaptation: P-gain
This parameter sets the P-gain of the PID controller implemented for the
speed adaptation. On standard applications with slow desired adaptation
speed it is recommended to set this parameter to zero.
F3.13 Speed adaptation: I-gain
Bosch Rexroth AG
DOK-SYTROX-DRN5020****-IT05-EN-P
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Frequency-Controlled Pump Drive System Sytronix DRn 5020
Commissioning of Sytronix DRn 5020 System
