4-192
Integral control: The output of this control is the integral of the error signal (difference between set value
and feedback value) and is used to minimize the offset signal that is left over from the gain control. When
the integral time (I) is increased, the system response becomes slower.
Differential control: This control is the inverse from integral control and tries to guess the behavior of the
error signal by multiplying the error with the differential time. The result is added to the PID input.
Differential control slows down the PID controller response and may reduce system oscillation.
Note: Most applications that PID control (fan and pump) do not require differential control.
Refer to Fig. 4.4.68 for PID control operation
Figure 4.4.68 PID Control
PID Control Type
The inverter offers two types of PID control:
(a) PID control with differential feedback: (10-03 = x1xxb)
Make sure to adjust the PID parameters without causing system instability. Refer to Fig. 4.4.69 for PID
control for feedback value differential.
Figure 4.4.69 PID control for feedback differential value
(b) Basic PID control: (10-03 = x0xxb)
This is the basic type of PID control. Refer to the Fig. 4.4.70.
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