Electrical Connections
5–4
1070 073 822-104 (02.06) GB
Interference suppression examples
Suppression of contacts:
(Alternating current, direct current, offset DC current)
R
C
R
C
Rp
U
VDR
a) b) c)
to b) For sensitive contacts, residual current when contact open!
to c) Voltage-dependent resistance, residual current when contact open!
Suppression of an inductive load:
(Motors, solenoid, relay and contactor coils)
R
C
R
a) b) c) d)
−
+
VDR
D
D
ZD
e)
U
VDR
C
to c) For relay, drop-off delay.
to d) For relay, defined drop-off delay.
to e) Must be optimized for inductance!
Suppression example – mains input:
M
~
L
1
N
SL
M
L
1
C
y
SL
C
x
C
x
L
2
L
3
C
x
C
x
C
x
3
~
C
y
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