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tions, the SSR function or the safe stopping function is likely to detect a violation. The safe stopping function aims to stop the mo-
tor, whereas the SSR function aims to keep the speed above the monitored minimum limit.
How to avoid a violation with the SSR function and a safe stopping function:
Use the SS1 and the SQS-SS1 functions in the time monitoring mode. After the delay, the STO function is activated and the SSR
monitoring is disabled. The situation after resetting the STO function still must be considered. The SSR must be reached before
the time that is set with SSR t1 elapses.
Deactivate the SSR function during the operation of safe stopping functions.
Do not use the SS2 function if you use the SSR function with a minimum limit value that is greater than zero, and if you cannot
deactivate the SSR function during the operation of the SS2 function. The SSR function will detect a violation of the minimum limit,
or the SOS function that is activated during the SS2 function will detect the rotation if the speed is still above SSR Min limit when the
SOS function becomes active.
AQ319736045637en-000101 / DPD01798110 | Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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