Safe Maximum Speed (Sms) - ABB FSO-21 User Manual

142 Safety functions

Safe maximum speed (SMS)

The SMS function is used to protect the machine from too high speeds/frequencies.
You can configure it to be permanently on or off. There are two different versions of
the SMS function:
1. Version 1: If the motor speed reaches the minimum or the maximum SMS trip
limit, the FSO module activates the SSE function.
2. Version 2: The minimum and maximum SMS limits limit the motor speed. This
version of the SMS function is similar to the SLS function except that it can only
be permanently on or off.
The required SMS function is selected with an FSO parameter at the start-up.
You can configure the minimum and maximum SMS and SMS trip limits separately.