Pid Controller - Xylem DIQ/S 281 Operating Manual

DIQ/S 281
Function
ba76226e02

PID controller

6.7.2
PID controller
The
lator can be configured as a Proportional regulator with switchable Integral and
Differential regulator parts (PID Controller).
The control response of the PID controller is described by the following formula:
= +
I I K
Regler 0
with:
−
I I
=
max min
K
X
p
= −
x x x
e soll ist
≤ ≤
I I
min Regler
I
Controller
I
0
K
X
p
x
e
x
actual
x
set
ti
td
t
I
min
I
max
The adjustable control parameters are x
table on page 124).
By activating or deactivating the Integral (
the following controller types can be configured:
Regulator type
P controller
03/2023
function can use an output as a controller output. The regu-

1

 
+ +
x x dt T
e e d

T
i
I
max
Current on the controller output at time t
Current on the output if x
Amplification
Proportional range
Control difference
Actual value (current measured value)
Set value
Integral algorithm
Differential control part
Time
Lower current limitation
Upper current limitation
td
[s]
0

dx
 
e

dt
= x
actual set
, I , X , I , I
set 0 p min max
ti
) and Differential (
ti
[s]
0
Outputs
ti td
, and (see setting
td)
controller part,
121