VYBO Electric Vector V800 - Group PA: PID Process Control Functions

Chapter 5: Detailed description of parameters
169
P9.63
Protection at zero load
Default
0
Setting range
0
Disabled
1
Enabled
P9.64
Level of zero load detection
Default
10.0 %
Setting range
0.0 % - 100.0 % (rated motor current)
P9.65
The zero load detection time
Default
1.0 s
Setting range
0.0 s – 60.0 s
If the zero load protection is activated and the output current of the inverter is lower than
the detection level (P9.64) and the continuous time exceeds the detection time (P9.65),
the inverter output frequency automatically drops to 7% of the nominal frequency. During
protection the inverter automatically accelerates to the set frequency if the normal load is
restored.
P9.67 - P9.70 Reserved
Group PA: PID process control functions
PID control is a general method of process control. By means of linear, integration and
differential operations between the feedback signal and the target signal, the output
frequency is adjusted and generates a feedback system to stabilize the controlled target
value.
It is applied to process control, such as flow control, pressure and temperature control.
The following figure shows the PID master block diagram.
Figure 4-23: Block diagram of PID control