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3-17
System Manual
C79000-G8576-C199-06
3.3.4
Special Measures for Interference-Free Operation
As a rule, inductances such as contactor or relay coils controlled by
SIMATIC S5 do not require external quenching elements in the circuit,
because the quenching elements are already integrated in the modules.
Inductances should only be fitted with quenching elements
when SIMATIC S5 output currents can be switched off by additionally
fitted contacts, such as relay contacts. In this case the integrated
quenching elements in the modules are no longer effective;
if they are not controlled by SIMATIC S5 modules.
You can place freewheel diodes, varistors or RC networks in circuit with
inductances.
Circuitry for DC-Operated
Inductances
With Diode
With Zener Diode
With Varistor
With RC Network
Circuitry for AC-Operated
Inductances
Figure 3-6
Quenching Circuits for Inductances
Fitting Quenching
Elements to
Inductances
Installation Guidelines
Содержание S5-135U
Страница 10: ...x SystemManual C79000 G8576 C199 06 Contents ...
Страница 18: ...1 8 SystemManual C79000 G8576 C199 06 Notes on Using this Manual and on the CE Symbol ...
Страница 26: ...2 8 SystemManual C79000 G8576 C199 06 Centralized and Distributed Configuration of a Programmable Controller ...
Страница 66: ...3 40 SystemManual C79000 G8576 C199 06 Installation Guidelines ...
Страница 496: ...9 114 SystemManual C79000 G8576 C199 06 Analog Input Output Modules ...
Страница 536: ...11 24 SystemManual C79000 G8576 C199 06 Connector Assignments ...
Страница 558: ...Index 8 SystemManual C79000 G8576 C199 06 Index ...