This parameter sets the I-gain of the PID controller implemented for the
speed adaptation. Higher values on this parameter increase the rate of the
speed adaptation. If this parameter is set to high, it will disturb the mechani‐
cal pressure control and cause oscillation of the system pressure.
F3.16 Speed adaptation: D-gain
This parameter sets the D-gain of the PID controller implemented for the
speed adaptation. On standard applications it is recommended to set this pa‐
rameter to zero.
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.
●
If the descending ramp is to steep the drive possibly recovers to much
energy and the DC link power gets to high. So its good practice to set
F3.22 between -0.5...-0.8 * F3.21.
Fig. 7-21:
Speed adaptation
DOK-SYTROX-DRN5020****-IT05-EN-P
Bosch Rexroth AG
73/143
Frequency-Controlled Pump Drive System Sytronix DRn 5020
Commissioning of Sytronix DRn 5020 System
