3
F
unction
d
iag
ram
s
3.2
E
xp
lana
tio
n
s on the fun
ction
diag
ra
ms
SINAMICS G120
C
U
250S-2 C
ontrol Units
74
0
List Manua
l, 09/2
017
, A5E3384289
0
F
ig.
3
-3
10
22 – Explan
ation of th
e
symbo
ls
(p
art
3)
- 1022 -
Function diagram
8
7
6
5
4
3
2
1
fp_1022_97_61.vsd
Explanations on the function diagrams
G120 CU250S-2
05.09.2017
V4.7.9
Explanation of the symbols (part 3)
T
0
x
y
pxxxx
y
x
H(s) =
s
2
2
· s + 1
+
+
s
2
2
2 ·
2
2
f
2nd Order Filter
|y|
fs
f_B
t
y
pxxxx
H(s) =
+
s
2
2
· s + 1
2 ·
2
1
y
x
f
|y|
fn
D
0
T
x
y
pxxxx
T
1
T
2
T
0
pxxxx
0
T
pxxxx
x
y
x
y
x
y
T
1
T
2
x
y
pxxxx pyyyy
pxxxx pyyyy
x
T
y
x
y
x
T
y
T
1
T
1
T
2
T
2
y
x
1
I
x
2
f_B
Switch-on delay
The digital signal x must have the value "1" without any interruption
during the time T before output y changes to "1".
Switch-off delay
The digital signal x must have the value "0" without interruption
during the time T before output y changes to "0".
Delay (switch-on and switch-off)
PT1 element
Delay element, first order.
pxxxx = time constant
PT2 low pass
Damping, denominator
D_d
pyyyy
Natural frequency, denominator
fn_d
pxxxx
Damping, denominator
D_d
pyyyy
Natural frequency, denominator
fn_d
pxxxx
Transfer function
2nd-order filter (bandstop/general filter)
Natural frequency, numerator
fn_n
pzzzz
Damping, numerator
D_n
pwwww
Used as bandstop filter
- center frequency fs:
fn_n = fs
fn_d = fs
- bandwidth f_B:
D_n = 0
D_d =
Transfer function when used as general filter
Analog adder can be activated
The following applies to I = 1 signal: y = x1 + x2
The following applies to I = 0 signal: y = x1
The digital signal x must have the value "1" without interruption
during time T1 or must have the value "0" during time T2 before
output y changes its signal state.
2 ·
· s + 1
2 · fs
T
T
T
T
T
T
1
0
pxxxx
Switch symbol
Simple changeover switch
The switch position is shown according
to the factory setting of pxxxx
(in this case switch position 1).
fn_n
D_n
fn_d
D_d
fn_d
fn_d
fn_n
fn_d
D_d
