88 Safety functions
SS1 with speed limit activated SBC
In these examples, the SBC and drive STO functions are activated at a user-defined
speed limit.
With time monitoring (SS1-t)
The operation of the SS1-t function with speed limit activated SBC is described in the
time diagrams and tables below. For configuration, see section How to configure SS1
with speed limit activated SBC on page 343.
With a safe speed estimate
A SBC speed (parameter SBC.15): Speed limit below which the FSO activates the SBC
(brake) and drive STO functions while ramping.
B SS1-t delay for STO (parameter SS1.14): Time after which the FSO activates the STO
function regardless of the motor speed.
C SBC time to zero (parameter SBC.13): Time from the SBC activation to the moment
when the safety function is completed and the SS1 completed indication (parameter
SS1.22) goes on. The acknowledgment becomes allowed. You must set this to the
estimated time in which the motor brakes to a stop from the maximum speed.
D Response time (depends on system configuration, see page 532)
Drive STO state
& indication
SS1 request
Motor speed
Time
SS1 state &
indication
1
6
2
5
SBC output
3
A
D
SS1 completed
indication
B
SS1.14
3b
- -> Safe torque off (STO)
C
SBC.13
4
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