Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Digital modules

3.5 How to protect digital modules from inductive overvoltages

S7-300 Automation System Module data

3-10 Manual, 08/2006, A5E00105505-04

3.5 3.5 How to protect digital modules from inductive overvoltages

Inductive overvoltages

Overvoltages occur when inductive reactance is deactivated. Examples of this are relay coils

and contactors.

Integrated overvoltage protection

The digital output modules of S7-300 have integrated overvoltage protection equipment.

Extra overvoltage protection

Inductive reactances should only be configured with extra overvoltage protection equipment

in the following instances:

● If SIMATIC output current circuits can be deactivated by extra fitted contacts (e.g. relay

contacts).

● If the inductive reactances are not activated by SIMATIC modules.

Note: Ask the suppliers of inductive reactances what size of overvoltage protection

equipment should be used.

Example

The following diagram shows an output current circuit which make extra overvoltage

protection equipment necessary.

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

&3836 60 6060 60 60 60

Figure 3-1 Relay contact for emergency stop in output current circuit

① Contact in output current circuit

② Inductive reactance needs a protective circuit

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