ABB FSO-21, User Manual

Page: 372 / 540

372 Configuration
constant even if the scaling value is decreased further. Zero speed value is less than
the 25 rpm and has no effect to the trip limit scaling.
Example 3 (with encoder):
• Original SLS4 limit 100 rpm
• Original SLS4 trip limit 110 rpm
• Zero speed value 3 rpm
In this example, the difference between original SLS4 and SLS4 trip limits is greater
than 5 rpm. SLS4 limit and trip limit are scaled down normally from 100% to 50%.
When the scaling value is 50%, the difference between the limits is 5 rpm and it stays
A Scaled SLS4 trip limit
B Scaled SLS4 limit
C Zero speed value FSOGEN.51
D The difference between SLS4 limits is 50 rpm when the scaling value is 100%
E The difference between the scaled SLS4 limits is 25 rpm if the scaling value is 50% or
less
Speed
Scaling value (%)
100
0
50
A
B
C
D
75 25
E