Related Safety Functions - ABB FSO-21 User Manual

Example 3 (with encoder): The original SLS4 and SLS4 trip limits are: 100 and
110 rpm. The scaling value is 10%. The zero speed value is 10 rpm.
• original SLS4 limit - original SLS4 trip limit = 10 rpm. This is greater than 5 rpm, so
5 rpm becomes the "limiting difference".
Scaling by 10%: SLS4 limit -> 10 rpm, SLS4 trip limit -> 11 rpm (difference 1 rpm)
Difference 5 rpm: SLS4 limit = 10 rpm, SLS4 trip limit -> 15 rpm
In this case, the scaled SLS4 and SLS4 trip limits become 10 and 15 rpm,
respectively. The difference between the scaled SLS4 and SLS4 trip limits is
5 rpm, and the scaled SLS4 trip limit is above the zero speed value (10 rpm).
Speed
SLS4 trip limit
SLS4 limit
15 rpm
10 rpm


Related safety functions

The Variable SLS function uses SAR1 parameters to monitor and/or define the
deceleration ramp (Variable SLS with ramp monitoring). See section
on page 294.
The FSO module activates the STO function if the motor speed hits a ramp
monitoring limit during the deceleration ramp (Variable SLS with ramp monitoring).
See section Configuring STO
The FSO module activates the SSE function if the motor speed hits a trip limit. See
section Configuring SSE
Difference 10 rpm (> 5 rpm)
5 rpm
on page 264.
on page 284.
Configuration 305
Scaled SLS4 trip limit
Scaled SLS4 limit
Configuring SAR
Time