ABB FSO-21 - SS1 with Time Monitoring (SS1-T)

80 Safety functions
 SS1 with time monitoring (SS1-t)
The operation of the SS1 with time monitoring (SS1-t) is described in the time
diagrams and tables below. For configuration, see section How to configure SS1 with
time monitoring (SS1-t) on page 340.
With a safe speed estimate
A SS1-t delay for STO (parameter SS1.14): 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 SS1 completed indication (parameter SS1.22)
goes on.
C Response time (depends on system configuration, see page 532)
Drive STO state
& indication
SS1 request
Motor speed
Time
SS1 state &
indication
1
2
5
3
A
B
C
3b
SS1 completed
indication
SS1.14
4
- -> Safe torque off (STO)