Functions
5.12 Safety-related applications
Frequency inverter
200 Operating Instructions, 08.10. 2008, t.b.d.
5.12.3 Controlling the safety functions via fail-safe inputs
Connecting sensors to fail-safe inputs
The fail-safe inputs of the frequency inverter are designed for connecting electromechanical
sensors with two NC contacts.
It is not possible to directly connect sensors with two NO contacts and antivalent contacts (1
NO contact and 1 NC contact).
Figure 5-40 Sensors that can be connected to the fail-safe inputs
The following diagrams show the principle possibilities of connecting-up fail-safe inputs:
● Connecting sensors with electromechanical contacts, e.g. Emergency Stop mushroom
pushbuttons and end position switches
● Connecting electronic sensors, e.g. SIMATIC FS-400 light curtains
● Connecting safety relays, e.g. SIRIUS 3TK28.
● Connecting fail-safe outputs, e.g. SIMATIC F digital output modules
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Figure 5-41 Connecting an electromechanical sensor
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