EXPERT Standard Series User Manual
165
Figure 6-43 Deviation Limit Schematic Diagram
F8.16
Closed-loop regulation
features
0～1
0
0: Positive action
Selected when a given increases, and the motor speed is required to increase.
1: Negative action
Selected when a given increases, and the motor speed is required to decrease.
F8.17
Sleep frequency
0.0～550.0Hz
50.00Hz
F8.18
Closed-loop
preset
frequency
0.0～550.0Hz
0.00Hz
F8.19
Closed-loop preset
frequency hold time
0.0～3600s
0.0s
Special function for water supply. When the steady-state output frequency of PID is
greater than the set frequency of F8.17, the drive will not automatically search for the lower
limit frequency, and the running frequency is completely controlled by PID. The purpose is
to avoid repeated regulation during peak water consumption, causing unstable water
pressure.
Function codes F8.18 and F8.19 allow the closed-loop regulation to quickly enter a
stable stage.
After the closed-loop operation is started, the frequency is first accelerated to the
closed-loop preset frequency F8.18 according to the acceleration time, and then
continuously runs F8.19 at this frequency point for a period of time, before running
according to the closed-loop characteristics.
Figure 6-44 Schematic Diagram of Closed-loop Preset Frequency Operation
