ABB FSO-21 - SSE with Time Monitoring

116 Safety functions
 SSE with time monitoring
The operation of the SSE with time monitoring is described in the time diagrams and
tables below. For configuration, see section How to configure SSE with time
monitoring on page 354.
With a safe speed estimate
A SSE delay for STO (parameter SSE.15): Time after which the FSO activates the STO
function regardless of the motor speed.
B Zero speed (parameter FSOGEN.51): Speed limit for activating the drive STO function.
The safety function is completed and the SSE completed indication (parameter SSE.22)
goes on. The acknowledgment becomes allowed.
C Response time (depends on system configuration, see page 532)
Drive STO state
& indication
SSE request
Motor speed
Time
SSE state &
indication
1
2
5
3
A
B
C
3b
SSE completed
indication
4
SSE.15
- -> Safe torque off (STO)