Adtech iMASTER – A1 Series - Pid

A1-User’s Manual
１４６
8.2.21 PID
The PID function enables the system running at the reference automatically by regulating the
process using the system feedback, error term. It is used for Cubic Feet of Air it moves per minute
(CFM) for fan application, Gallons per minute (GPM) for pump application, pressure control,
heating application, etc.
Process
Proportional
Integral
Derivative
Current Error
Accumulated Past Error
Predicts Future Error
Based on current rate of changes
Error, e(t)
Set Point
+
_
Basic PID Overview
P
0
= K
p
e(t)
I
0
= K
i
D
0
= K
d
d
dt
e(t)
t
o
e(t) dt
u(t)
PID Functional Description
 Reference: Desired System Output Value
 Error: Difference between System output and reference
 Proportional (P) Term: Current Error
 Integral (I) Term: Accumulated Past Error
 Derivative (D) Term: Predicted Future Error based on current rate of changes
 40.01 PID function select
0: Disable ----- Initial value
1: Enable
Select PID function type
 Related Parameters: '40.01' ~ '40.24'
 40.02 PID reference
Range: 0.0 ~ 100.0 % in 0.01 %
Initial value: 0.0 %
It can be worked when '40.03'(PID reference source) set 2
 Related Parameters: '40.03'