ABB FSO-21 - Page 126

126 Safety functions
With an encoder
A SBC speed (parameter SBC.15): Speed limit below which the FSO activates the SBC
(brake) and drive STO functions while ramping.
B Zero speed with encoder (parameter FSOGEN.52): Speed limit to define the motor as
stopped. The safety function is completed and the SSE completed indication (parameter
SSE.22) goes on. The acknowledgment becomes allowed.
C SSE delay for STO (parameter SSE.15): Time after which the FSO activates the STO
function regardless of the motor speed.
D Response time (depends on system configuration, see page 532)
SSE.15
Drive STO state
& indication
SSE request
Motor speed
Time
SSE state &
indication
1
6
2
5
SBC output
3
A
D
SSE completed
indication
C
B
4
3b
- -> Safe torque off (STO)