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74 Safety functions
SBC before STO
The operation of the SBC before the STO function (negative SBC delay) is described
in the time diagrams and tables 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.
Without an encoder
A
SBC delay (parameter
): 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-21
Страница 1: ... OPTIONS FOR ABB DRIVES FSO 21 safety functions module User s manual ...
Страница 4: ......
Страница 16: ...16 Safety instructions ...
Страница 34: ...34 Safety information and considerations ...
Страница 52: ...52 Overview ...
Страница 236: ...236 PROFIsafe ...
Страница 265: ...PROFIsafe 265 2 Select your CPU from the list 3 Install the FENA 21 GSDML file ...
Страница 275: ...PROFIsafe 275 20 In ABB_Drive FB add blocks DPRD_DAT and DPWR_DAT 21 Insert values to blocks ...
Страница 282: ...282 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Страница 286: ...286 PROFIsafe ...
Страница 304: ...304 Installation ...
Страница 400: ...400 Configuration ...
Страница 488: ...488 Verification and validation ...
Страница 506: ...506 Fault tracing ...
Страница 514: ...514 Maintenance ...
Страница 536: ...536 Technical data ...
Страница 538: ...538 Dimension drawings 3AXD50000018513 ...