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Safety functions 83
Step Description
1
The SS1 request is received (for example from the I/O). The FSO starts a counter for
time A. SS1 state indication parameter
(
) goes on.
2
After time C has elapsed, the drive starts to ramp down the motor speed. SAR1
parameter
defines the deceleration ramp.
Note:
If parameter
has value
0
, the drive (parameter
23.23
) defines the ramp.
3
The motor speed reaches the zero speed limit (B), the FSO activates the drive STO
function and STO active indication parameter STO output (
) goes on. The
indication (parameter
) goes on and the acknowledgement
becomes allowed as soon as the SS1 request has been removed (step 4).
Note
: If the SBC is configured in the STO function (see section
page
), also the SBC is activated (not shown in the figure).
) is negative, the SBC is activated here and
the drive STO after this delay.
is positive or zero, the SBC and drive STO functions are
activated at the same time.
Note
: You can define an extra delay (parameter
) before the FSO activates the
drive STO (and SBC, if used) (not shown in the figure).
3b
If the drive has not ramped down fast enough when time A has elapsed, the FSO
activates the STO function. See section
on page
for more
information on how to configure the STO function.
4
The SS1 request is removed.
5
After the acknowledgement, the STO and SS1 functions are deactivated. The
indications
(
) go off.
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 ...