Fig. 7-41:
Impact of boost ramp on adaptation speed
F3.21 Speed adaptation: Ramp pitch, ascending
This parameter limits the positive gradient of the speed adaptation. For this
purpose, the output of the PID controller is monitored.
●
If the ramp is too steep, this can cause instability in the superimposed
pressure controller of the DR/DRG pump.
●
A small ramp is noncritical, but can cause the boost function to be acti‐
vated.
F3.22 Speed adaptation: Ramp pitch, descending
This parameter limits the negative gradient of the speed adaptation. For this
purpose, the output of the PID controller.
●
If the ramp is too steep, this can cause instability in the superimposed
pressure controller of the DR/DRG pump.
●
A small ramp is noncritical, but decreases the effect of the speed adap‐
tation on the energy and noise reduction.
③ Velocity lower limitation parameter setting
F3.19 Speed adaptation: Minimum speed
This parameter limits the minimum speed of the speed adaptation.
●
With low flow rates, the limitation of the minimum speed causes the ac‐
tual swivel angle value to stationarily fall below the command value from
F1.09.
●
When loads are switched on, a low minimum speed can reduce the dis‐
turbance rejection of pressure control.
F3.20 Speed adaptation: Maximum speed
This parameter limits the maximum speed of the speed adaptation.
●
The maximum speed may not exceed the allowed limit values of the
DR/DRG pump used.
●
The drive is accelerated to the parameterized speed, if a pressure drop
is detected or when the speed adaptation has been deactivated (cf.
DOK-SYTROX-DRN5020****-IT05-EN-P
Bosch Rexroth AG
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Frequency-Controlled Pump Drive System Sytronix DRn 5020
Commissioning of Sytronix DRn 5020 System
