Safety functions 111
With an encoder
A Zero speed with encoder (parameter FSOGEN.52): Speed limit at which the motor has
stopped, the SSE completed indication (parameter SSE.22) goes on and the
acknowledgment becomes allowed.
B SBC delay (parameter SBC.12): Time from the activation of the drive STO function to the
moment when the FSO activates the SBC function (brake).
In this case, the value is
positive and the FSO activates the SBC after the drive STO. If the value is zero, the FSO
activates the SBC and drive STO at the same time. Note: It is possible to set the SBC
delay so that the SBC is activated while the motor is still rotating.
Step Description
1 SSE request is received (for example, from the I/O). The FSO activates the drive STO
and starts a counter for time B. SSE active indication SSE output (SSE.21) and STO
output (STO.21) go on.
2 After time B has elapsed, the FSO activates the SBC function (brake).
Note: If speed limit A is reached before time B has elapsed, the FSO activates the SBC
immediately when the motor has stopped.
3 The motor speed reaches the zero speed limit (A), the FSO module defines the motor
as stopped and the SSE completed indication goes on. The acknowledgement
becomes allowed as soon as the SSE request has been removed (step 4).
4 The SSE request is removed.
5 After the acknowledgement, the SSE, STO and SBC functions are deactivated and the
control is given back to the drive, which controls the brake from now on. The indications
SSE output (SSE.21), SSE completed output (SSE.22), and STO output (STO.21) go
off.
Drive STO state
& indication
SSE request
Motor speed
Time
SSE completed
indication
1
4
B
2
SBC output
5
3
SBC.12
A
SSE state &
indication
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