Siemens SIMATIC - Page 160

Switching of Loads
E.1 Switching of Capacitive Loads
ET 200pro Distributed I/O System - Fail-Safe Modules
160 Operating Instructions, 05/2007, A5E00394073-02
Remedy:
1. Determine the load current and capacitance of the load.
2. Determine the operating point in the figure above.
3. If the operating point is above the curve, you must increase the load current until the new
operating point is below the curve by connecting a resistor in parallel.
Switching of Capacitive Loads for the F-Switch PROFIsafe
The figure below shows the typical curves indicating the relationship between load
resistance and switchable load capacitance.
Behavior is as described above.
&DSDFLWLYHORDGSDUWLQ˩)
/RDGFXUUHQWLQP$
7HVWRIRXWSXWVHQDEOHG 7HVWRIRXWSXWVGLVDEOHG
Figure E-2 Comparison of Maximum Switchable Capacitive Loads for the F-Switch PROFIsafe