abc 2000 Series User Manual page 97

Detecti o n l e vel
P9. 6 4 becomi n g 0
Detecti o n ti m e
P9. 6 5 becomi n g 0
If protection upon load becoming 0 is enabled, when the output
current of the AC drive is lower than the detection level {P9.64)
and the continuous time exceeds the detection time (P9.65), the
output frequency of the AC drive automatically declines to 7% of the
rated frequency. During the protection, the AC drive automatically
accelerates to the set frequency if the load resumes to be normal.
P9.67-P9.70 Reserved
Group PA: Process Control PIO Function
PID control is a general process control method. By performing
proportional, integral and differential operations on the difference
between the feedback signal and the target signal.it adjusts the
output frequency and constitutes a feedback system to stabilize the
controlled counter around the target value.
It is applied to process control such as flow control, pressure control
and temperature control. The following figure shows the principle
block diagram of PID control.
Fi g ure
of load
l o ad
of
Tf s
I I
TM+l
P nc
le block diagram
p
4-23 i
ri
PIDf.f1!4lut
p
of P!D control