PLC COMMAND
FIRST CYCELE
SECOND CYCELE
8.2.6 Process PID setting main frequency
Process PID control is a common method of process control. By performing proportional, integral and
differential operations on the difference between the feedback signal of the controlled quantity and the target
signal, the output frequency of the inverter is adjusted to form a closed-loop system to stabilize the controlled
quantity. at target value;
When the system uses closed-loop PID as the command input, if the terminal is set to disable PID (terminal
function 44), the system will switch to the F9.29 standby channel for adjustment.
Figure 8 -2-6 Simple PLC continuous cycle mode
F9.00 GIVEN CHANEL
SELECTION
F9.15 closed-
loop regulation
Reserve
Reserve
Reserve
Multi-stage
command
F9.14 closed-loop
reverse selection
PID pause (X1~X6
function 43)
PID deviation limit
( F9.10)
F9.01 Feedback
channel selection
Primary frequency
as PID
Secondary frequency
as PID
frequency command
Primary and
secondary
frequency
operation
Reserve
Reserve
Reserve
Figure 8 -2-7 Schematic diagram of process PID as the main frequency
043
NVF2G-S Series Inverter User's Guide