ABB FSO-21 - Page 98

98 Safety functions
With an encoder
A SBC speed (parameter SBC.15): Speed limit below which the FSO activates the SBC
(brake).
B Zero speed with encoder (parameter FSOGEN.52): Speed limit to define the motor as
stopped. The safety function is completed and the SS1 completed indication (parameter
SS1.22) goes on. The acknowledgment becomes allowed.
C SS1-t delay for STO (parameter SS1.14): Time after which the FSO activates the STO
function regardless of the motor speed.
D SBC delay (parameter SBC.12): Time from the activation of the SBC function to the
moment when the FSO activates the drive STO function
.
E Response time (depends on system configuration, see page 532)
Drive STO state
& indication
SS1 request
Motor speed
Time
SS1 state &
indication
1
7
2
6
SBC output
3
A
E
SS1 completed
indication
C
SS1.14
B
3b
D
SBC.12
5
4
- -> Safe torque off (STO)