Safety functions 73
C Restart delay after STO (parameter STO.13): 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.
Step Description
1 The STO request is received (for example, from the I/O). The FSO activates the drive
STO function and starts counters for times B and C. STO active indication parameter
STO output (STO.21) goes on.
2 After time C has elapsed, the acknowledgement becomes allowed as soon as the STO
request has been removed (step 5).
3 After time B has elapsed, the FSO activates the SBC function (brake).
Note: If zero speed limit A is reached before time B has elapsed, the FSO activates the
SBC function immediately when the motor has stopped.
4 The motor speed reaches the zero speed limit (A), the FSO module defines the motor
as stopped and the STO completed indication goes on.
5 The STO request is removed.
6 After the acknowledgement, the STO and SBC are deactivated, and the control is given
back to the drive, which controls the brake from now on. The indications STO output
(STO.21) and STO completed output (STO.22) go off.
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