Fso Boot Behavior With Sls Active - ABB FSO-21 User Manual

Safety functions module

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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

is configured so that Modoff delay time or Monitoring active is selected, the FSO will

prevent the drive from restarting until the

SLS request is active during FSO boot.

FSO module is rebooted.

has elapsed, STO acknowledgement is possible, and SLS indication is

Note: STO acknowledgement is not possible until

to acknowledge STO before

be restarted.

delay time counter is started.

delay has elapsed,

delay time has elapsed.

STO.14 delay

delay has elapsed. If you try

delay time counter will