ABB FSO-21 - Page 108

108 Safety functions
With an encoder
A Zero speed with encoder (parameter FSOGEN.52): Speed limit at which the motor has
stopped, the safety function is completed and the SSE completed indication (parameter
SSE.22) goes on. The acknowledgment becomes allowed.
Step Description
1 The SSE request is received (for example, from the I/O). The FSO activates the drive
STO function. SSE active indication SSE output (SSE.21) and STO output (STO.21)
go on.
2 The motor speed reaches the zero speed limit (A), the FSO 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 3).
3 The SSE request is removed.
4 After the acknowledgement, the SSE and STO functions are deactivated, and the
control is given back to the drive. The indications SSE output (SSE.21), SSE
completed output (SSE.22), and STO output (STO.21) go off.
Drive STO state
& indication
3
SSE request
Motor speed
Time
A
4
2
SSE completed
indication
1
SSE state &
indication