166 Safety functions
FSO boot behavior with SLS active
When the safe speed estimate is in use, the following boot behavior exists.
During FSO module boot, the FSO module has no valid speed data and thus a very
high initialization value for motor speed is assumed for internal FSO usage. If an SLS
function or variable SLS function is active during FSO reboot and parameter SLSx.05
is configured so that Modoff delay time or Monitoring active is selected, the FSO will
prevent the drive from restarting until the STO.14 delay time has elapsed.
Step Description
1 SLS request is active during FSO boot.
2 FSO module is rebooted. STO.14 delay time counter is started.
3 STO.14 has elapsed, STO acknowledgement is possible, and SLS indication is
activated.
Note: STO acknowledgement is not possible until STO.14 delay has elapsed. If you try
to acknowledge STO before STO.14 delay has elapsed, STO.14 delay time counter will
be restarted.
Time
SLS ok
STO
SLS request
STO.14 delay
FSO boot
2 31
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