PI controller characteristics

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PI controller characteristics

In order to compensate the remaining deviation, an integral component must be enabled in the controller. This is done by setting the ShiftIntegralTime > 0. The smaller this time, the stronger the adjustment of the integral component.

The following values are applicable in this case:

ProductLength = 3000 units

Velocity = 30,000 units/s

 

Controller parameters: ShiftGain=0.35, ShiftIntegralTime=0.3, MaxShiftCorrection=50; controller is enabled at a deviation of approx. -130.

pi-regler1

Since the integral adjustment is too strong, i.e. the integral action time is too small, there is a long transient effect and strong overshoots.

 

Controller parameters: ShiftGain=0.35, ShiftIntegralTime=0.4, MaxShiftCorrection=50; controller is enabled at a deviation of approx. -130.

pi-regler2

In this case, there is one overshoot before the actual value reaches the setpoint with no remaining deviation.

 

Controller parameters: ShiftGain=0.35, ShiftIntegralTime=0.6, MaxShiftCorrection=50; controller is enabled at a deviation of approx. -130.

pi-regler3

In this case, there is also one overshoot, but then the actual value reaches the setpoint more quickly.

These settings represent a good compromise between the size of the overshoot and the time it takes to reach the setpoint while completely compensating for the deviation.