Setting functions
8.9 Safe Torque Off (STO) safety function
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
243
Setting the filter for safety-related inputs
Procedure
To set the input filter and simultaneity monitoring of the safety-related 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 safety-related input.
Description of the signal filter
The following are available for the signal processing of the safety-related 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 safety-
related input, e.g. a wire break.
When appropriately set, the inverter tolerates brief discrepancies.
The tolerance time does not extend the inverter response time. The inverter selects its safety
function as soon as one of the two F-DI signals changes its state from high to low.
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