ABB FSO-12, User Manual

Page: 283 / 388

Configuration 283

How to fine-tune when zero speed limits are detected
Example 1 : Zero speed limit in reached in the SS1 function (and SSE with
emergency ramp), the SBC is not used.
• parameter FSOGEN.31 Transient mute time = 20 ms .
Example 2 : Zero speed limit in reached in the SS1 function (and SSE with
emergency ramp), a negative SBC delay (parameter SBC.12 STO SBC delay ) is
configured in the STO function:
• parameter FSOGEN.31 Transient mute time = 20 ms .
Note : If the SBC delay (parameter SBC.12 STO SBC delay ) is positive or zero
( 0 ms ), the SBC and STO functions are activated at the same time.
Time
Speed
Zero speed
limit reached
FSOGEN.51
= 90 rpm
Mute time elapsed, STO activated
FSOGEN.31 = 20 ms
Time
Speed
Zero speed
limit reached
FSOGEN.51
= 90 rpm
Mute time elapsed, SBC activated
FSOGEN.31 = 20 ms
SBC delay elapsed, STO activated
SBC.12 = -15 ms