Configuration - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RT2 contactors/contactor assemblies
2.7 Accessories
Circuit diagram
The diagram below shows an RC circuit with an RC element on the left, and an RC circuit
with a varistor on the right.
Figure 2-32
2.7.4.2

Configuration

Selection aid
When motors or various inductive loads are disconnected, a counter-source voltage is
generated. This can lead to voltage peaks of up to 4,000 V with a frequency spectrum from
1 kHz to 10 MHz and a rate of voltage variation from 0.1 to 20 V/ns.
Figure 2-33
Capacitive input to various analog and digital signals makes it necessary to suppress
interference in the load circuit.
180
EMC suppression module, circuit diagram
Counter-source voltage without RC circuit
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03