Setting The Filter For Fail-Safe Inputs - Siemens SINAMICS G120 Operating Instructions Manual

8.8.3.6

Setting the filter for fail-safe inputs

Procedure
To set the input filter and monitoring for simultaneous operation for a fail-safe input, proceed
as follows:
1. Select the advanced settings for STO.
2. Set the debounce time for the F-DI input filter.
3. Set the discrepancy for the simultaneity monitoring.
4. Close the screen form.
You have set the input filter and the simultaneity monitoring of the fail-safe input.
Description of the signal filter
The following are available for the signal processing of the fail-safe inputs:
● A tolerance for the simultaneous monitoring.
● A filter to suppress short signals, e.g. test pulses.
A tolerance for the simultaneous monitoring
The inverter checks whether the signals at both inputs always have the same signal status
(high or low).
With electromechanical sensors (e.g. emergency stop buttons or door switches), the two
sensor contacts never switch at exactly the same time and are therefore temporarily
inconsistent (discrepancy). A long-term discrepancy indicates a fault in the wiring of a fail-
safe input, e.g. a wire break.
When appropriately set, the inverter tolerates brief discrepancies.
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
8.8 Safe Torque Off (STO) safety function
Setting functions
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