Speed
Logical level
Logical level
SSM Reached
SSM Active
SSM Max Limit
SSM Min Limit
SSM td2
t
SSM Request
t
SSM td2
SSM td2
SSM Above
Max Limit
SSM Below
Min Limit
t
t
t
t
e30bi357.10
Illustration 67: The SSM Function Requested Externally, Automatic Acknowledgment
6.4 Combinations of Safety Functions
When many safety functions are used at the same time, all active safety functions execute the parameterized monitoring. Depend-
ing on the parameter settings of the functions and the system design, unexpected violations can occur.
N O T I C E
The Advanced safety option board or the PC tool do not check if the parameter values of different safety functions are compati-
ble.
N O T I C E
When the first violation is detected, the other safe monitoring functions stop their monitoring until the violation is reset. The
exception is the SSM function which continues to monitor the speed and update the output value.
Using the SSR function and a safe stopping function at the same time causes a conflicting situation. If the SSR function has a mini-
mum limit value that is greater than zero, and is active during the execution of the SS1, the SS2, the SQS-SS1, or the SQS-SS2 func-
AQ319736045637en-000101 / DPD01798 | 109Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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