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154 Safety functions
Step Description
1
The SLS request is received. The motor speed is above the SLS trip limit positive (A).
The drive starts to ramp down the motor speed. The SAR1 parameter
defines
the deceleration ramp slope until the speed reaches the SLS limit. The FSO starts the
SAR1 ramp monitoring (parameters
). SAR1 configuration defines
the target and monitoring limits for the deceleration ramp (
,
).
Note:
If parameter
has value 0, the drive (drive parameter 23.23) defines the
deceleration time.
2
The drive trips on a fault, there is a drive power loss, or user stops the drive by coast
stop.
SAR1 monitoring of the FSO is on (parameter
configured as Monitoring active
and modoff delay time).
SLS Modoff delay time starts (parameters
).
As the modulation is lost, FSO's safe speed estimation is stopped and it starts to use
the last speed information that it had before the modulation was lost.
3
Modulation of the drive returns before the last valid speed information hits the SAR1
limit and before the modoff delay time has run out.
Deceleration continues as parametrized as long as the speed does not hit the SAR1
limits.
4
If modulation of the drive has not returned and the
out or the last valid speed reaches the SAR limit, FSO activates STO function and STO
indication (parameter
STO output). See section See section
on page
for more information on how to configure the STO function.
5
The FSO starts the SLS monitoring when the motor speed is in the middle of the SLS
limit and the SLS trip limit (see also section
How to configure mute time for monitoring
on page
), and stops the SAR1 monitoring. The SLS indication (parameters
,
) goes on.
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 ...