ABB FSO-12, User Manual

Page: 267 / 388

Configuration 267
Example 1 : 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 smaller than 25 rpm,
so 10 rpm becomes the “limiting difference”.
Scaling by 10%: SLS4 limit -> 10 rpm, SLS4 trip limit -> 11 rpm (difference 1 rpm).
Difference 10 rpm: SLS4 limit = 10 rpm, SLS4 trip limit -> 20 rpm
In this case, the scaled SLS4 and SLS4 trip limits become 10 and 20 rpm,
respectively. The difference between the scaled SLS4 and SLS4 trip limits is
10 rpm, and the scaled SLS4 trip limit is above the zero speed value (10 rpm).
Example 2 : The original SLS4 and SLS4 trip limits are: 1000 and 1100 rpm. The
scaling value is 0%. The zero speed value is 20 rpm.
• original SLS4 limit - original SLS4 trip limit = 100 rpm. This is greater than 25 rpm,
so 25 rpm becomes the “limiting difference”.
Scaling by 0%: SLS4 limit -> 0 rpm, SLS4 trip limit -> 0 rpm (difference 0 rpm)
Difference 25 rpm: SLS4 limit = 0 rpm, SLS4 trip limit -> 25 rpm
In this case, the scaled SLS4 and SLS4 trip limits become 0 and 25 rpm,
respectively. The difference between the scaled SLS4 and SLS4 trip limits is
25 rpm, and the scaled SLS4 trip limit is above the zero speed value (20 rpm).
Speed
Time
Difference 10 rpm (< 25 rpm)
SLS4 limit
10 rpm
SLS4 trip limit
Scaled SLS4 trip
Scaled SLS4 limit
10 rpm
20 rpm
Speed
Time
Difference 100 rpm (> 25 rpm)
SLS4 limit
25 rpm
20 rpm
SLS4 trip limit
Scaled SLS4 trip limit
Scaled SLS4 limit