N O T I C E
The stable signal time extends the safety option response time. The safety option only activates the safety function after the
response time has expired.
If the signal to the input on safety option is not stable, the option responds with an external fault after the stable signal time expires.
Definition of a Stable Signal
Following a change to the DI input signals, the option triggers an internal monitoring time. Use parameter 42-23 Stable Signal Time to
select an appropriate stable signal time. A constant signal level is a high or a low state, at least for the time specified in parameter 42-23
Stable Signal Time.
Safety function
Active
Inactive
S table signal time S table signal time
Illustration 8: Filter for Suppressing Temporary Signal Changes
Functions
Installation Guide | VLT®Safety Option MCB 152
AN327351953089en-000101 / 130R0578| 19
Danfoss A/S © 2020.02
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