Safety functions 59
SBC before STO
The operation of the SBC before the STO function (negative SBC delay) is described
in the time diagram and table below. For configuration, see section
on page
The reason to use a negative SBC delay is to have the mechanical brake closed just
before the drive STO circuit is opened.
A
): Time from the activation of the drive STO to the moment
when the FSO activates the SBC function (brake)
.
In this case the value is negative and
the FSO activates the SBC before the drive STO. If the value is zero, the FSO activates
the SBC and drive STO functions at the same time.
B
SBC time to zero speed (parameter
): Time from the SBC activation to the
moment when the safety function is completed and the STO completed indication
(parameter
) 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.
C
Response time (depends on system configuration, see page
Drive STO state
& indication
STO request
Motor speed
Time
A
STO completed
indication
1
6
5
SBC output
3
B
4
C
2
Содержание FSO-12
Страница 1: ... OPTIONS FOR ABB DRIVES FSO 12 safety functions module User s manual ...
Страница 4: ......
Страница 12: ...12 Table of contents ...
Страница 26: ...26 Introduction to the manual The PROFIsafe certificate for the FSO 12 module is attached below ...
Страница 36: ...36 Safety information and considerations ...
Страница 136: ...136 Safety functions ...
Страница 196: ...196 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Страница 200: ...200 PROFIsafe ...
Страница 326: ...326 Start up ...
Страница 386: ...386 Dimension drawings ...