User Manual
EM303A General Purpose Inverter
104
keypad. Upon the completion of uploading, F3-31=0 is set automatically.
F3-31=2 Download the parameters from the EEPROM on keypad to the control panel
of inverter. Upon the completion of downloading, F3-31=0 is set
automatically.
The function may be applied to the setting parameter copy between different
inverters, and to save the initial parameters defined by user. When the
parameters are edited by mistake, the inverter cannot work normally, please
ownload the parameter to reset user parameters.
7.5 Group F4: General Parameters of PID
PID control is a close-loop control mode, which feedbacks the output signal of
control object in the system to PID controller, and then form one or more
close-loops by regulating the output of controller after PID calculation. PID control
is to make the output value of control object in the system identical to the setting
target value.
Based on the error between system setting target and feedback signal, PID controller
computes the control variables with proportion, integration and differentiation. The
characteristics of each computing factor are as follows:
Proportion (P):
Proportional control is a simplest control mode. The output and input error signal of
its controller is in proportional relation. The stable errors of system output exist in
proportional control mode only.
Integration (I):
In integration control mode, the output and input error signal integration of
controller is in direct ratio. It can eliminate stable error and keep the system away
from stable errors after entering stable status, but sharp changes cannot be tracked.
Differentiation (D):
In differentiation control mode, the output and input error signal differentiation (i.e.
the change ratio of error) of controller is in direct ratio. It can forecast the trend of
error change with quick response, and improve the dynamic performance of system
in the process of regulation.
★ Stable error refers to the difference between the expected output of system and
the actual output after system response is stable.
See Figure 7-13 for the function of three computing factors in PID control mode.
To Next Page
Loading...
Need help?
General