Parameter adjustment effects, Formulas, Operation – West Control Solutions KS 40-1 Burner User Manual
Page 12

Values T
g
and x
max
(step change from 0 to 100 %) or
Dt and Dx (partial step re-
sponse) can be used to determine the maximum rate of increase v
max
.
y =correcting variable
Y
h
=
control range
Tu
=
delay time (s)
Tg
=
recovery time (s)
X
max
=
maximum process value
V
max
=
Xmax
Tg
=
{
{
x
t
= max. rate of increase of process value
The control parameters can be determined from the values calculated for delay
time T
u
, maximum rate of increase v
max
, control range X
h
and characteristic K ac-
cording to the formulas given below. Increase Xp, if line-out to the set-point os-
cillates.
Operation
KS40-1 burner
12
Manual tuning
Tu
Tg
t
x
y
100%
0%
t
Yh
Xmax
{X
{t
Parameter adjustment effects
Parameter
Control
Line-out of disturbances
Start-up behaviour
Pb1 higher increased damping
slower line-out
slower reduction of duty cycle
lower
reduced damping
faster line-out
faster reduction of duty cycle
td1 higher reduced damping
faster response to disturbances faster reduction of duty cycle
lower
increased damping
slower response to disturbances slower reduction of duty cycle
ti1 higher increased damping
slower line-out
slower reduction of duty cycle
lower
reduced damping
faster line-out
faster reduction of duty cycle
Formulas
K = Vmax * Tu
controller behavior
Pb1 [phy. units]
td1 [s]
ti1 [s]
With 2-point and
3-point controllers,
the cycle time must be
adjusted to
t1 / t2 £ 0,25 * Tu
PID
1,7 * K
2 * Tu
2 * Tu
PD
0,5 * K
Tu
OFF
PI
2,6 * K
OFF
6 * Tu
P
K
OFF
OFF
3-point-stepping
1,7 * K
Tu
2 * Tu