Siemens SINUMERIK 828D Function Manual page 30

Description of the Safety Integrated Extended Functions
3.7 Safe Speed Monitor (SSM)
How does SSM function in detail?
Prerequisites:
● The safety function SSM cannot be selected or deselected using external control signals.
● SSM is active, if you have set a monitoring speed > 0 for SSM .
Evaluating the speed
The inverter compares the load speed with the speed limit and signals if the limit value falls
below the higher-level control.
Figure 3-3
30
Time response of the safety function SSM (Safe Speed Monitor)
Function Manual, 07/2012, 6FC5397-3EP40-3BA0
Safety Integrated