Safety functions 71
SBC after STO
The operation of the SBC after the STO function (positive SBC delay) is described in
the time diagrams and tables below. For configuration, see section How to configure
SBC after STO on page 333.
Without an encoder
A SBC delay (parameter SBC.12): Time from the activation of the drive STO function to the
moment when the FSO activates the SBC function (brake). In this case the value is
positive and the FSO activates the SBC after the drive STO. If the value is zero, the FSO
activates the SBC and drive STO functions at the same time. Note: It is possible to set
the SBC delay so that the SBC is activated while the motor is still rotating.
B SBC time to zero speed (parameter SBC.13): Time from the SBC activation to the
moment when the safety function is completed and the STO completed indication
(parameter STO.22) goes on. You must set this to the estimated time in which the motor
brakes to a stop from the maximum speed.
C Restart delay after STO (parameter STO.13): Time from the STO activation to the
moment when the acknowledgment becomes allowed. With this parameter, you can
allow a restart of the drive before the motor has stopped (fly-start). You can use this
feature only in certain applications. This parameter is relevant only when an external
request activates the STO function.
Drive STO state
& indication
STO request
Motor speed
Time
STO completed
indication
1
5
A
3
SBC output
B
2
6
C
4
SBC.13SBC.12
STO.13
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