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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
on page
Without an encoder
A
SBC delay (parameter
): 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
): Time from the SBC activation to the
moment when the safety function is completed and the STO completed indication
(parameter
) 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
): 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
Summary of Contents for FSO-21
Page 1: ... OPTIONS FOR ABB DRIVES FSO 21 safety functions module User s manual ...
Page 4: ......
Page 16: ...16 Safety instructions ...
Page 34: ...34 Safety information and considerations ...
Page 52: ...52 Overview ...
Page 236: ...236 PROFIsafe ...
Page 265: ...PROFIsafe 265 2 Select your CPU from the list 3 Install the FENA 21 GSDML file ...
Page 275: ...PROFIsafe 275 20 In ABB_Drive FB add blocks DPRD_DAT and DPWR_DAT 21 Insert values to blocks ...
Page 282: ...282 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Page 286: ...286 PROFIsafe ...
Page 304: ...304 Installation ...
Page 400: ...400 Configuration ...
Page 488: ...488 Verification and validation ...
Page 506: ...506 Fault tracing ...
Page 514: ...514 Maintenance ...
Page 536: ...536 Technical data ...