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LEAd
Differentiator with adjustable time constant t and gain P1.
Formula:
y(t)
y(t-T
)
r
T
= calculating cycle time = 160ms (320ms with resistance input)
r
t = time constant
x(t)
x(t-T
)
r
P1
The control input sets the output to 0.
(1) If the differentiator shall calculate a change per hour
⋅
P
1
60
(2) If the differentiator shall calculate a change per minute,
⋅
P
1
1
[
min
Procedure
Dependent of the maximum rate of change and of the required filter
+
effect, time constant t must be selected.
Use t to calculate the required gain P1 Ä (1) , (2).
+
Scal: y
SCAl
FiLt
Filterfunction t: Filter time constant ; b_F:Filterbandwidth
Parameter Point determines the number of digits behind the decimal point
---. - -
in the display (0...4). , when the output value of Func2 is displayed (normal
condition) see also p. 9 , switch Ct-di.
dISPL
12
t
{
=
⋅
y t
( )
+
t
T
r
= differentiator output
= differentiator output at last calculating cycle
= differentiator input
= differentiator input at last calculating cyle
= gain
t
=
1
is required.
[
min
]
t
=
1
is required.
]
=
+
ax b
(a --> A ; b --> P1)
[
+
⋅ 1
y t T
( \
)
P
x t
( ) \ ( \
r
}
]
x t T
)
r
9499-040-24701
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