146 Safety functions
Step Description
1 The SLS request is received. The motor speed is above the SLS trip limit positive (A).
2 After time C has elapsed, the drive starts to ramp down the motor speed. The SAR1
parameter 200.112 defines the deceleration ramp until the speed reaches the SLS limit
positive (B). The FSO starts the SAR1 ramp monitoring (parameters SARx.21,
SARx.22).
Note: If parameter 200.112 has value 0, the drive (parameter 23.23) defines the ramp.
The FSO starts the SLS monitoring when the motor speed is in the middle of the SLS
limit and the SLS trip limit (see also section How to configure mute time for monitoring
start on page 399), and stops the SAR1 monitoring. The SLS active indication
(parameter SLSx.15, SLSx.24, SLSx.34 or SLSx.44) goes on.
2b If the motor speed does not follow the ramp monitoring limits, the FSO activates the
STO function. See section Safe torque off (STO) on page 67 for more information on
how to configure the STO function.
3 The motor speed reaches the SLS limit positive (B).
3-5 The drive limits the motor speed, but if the motor speed still reaches the SLS trip limit
positive, the FSO activates the SSE function. For more information, see section SLS
trip limit hits on page 167.
4 The SLS request is removed, but the SLS monitoring is still on (acknowledgement
method is manual or from a safety PLC).
Note: If automatic acknowledgement is used, the SLS monitoring is also ended.
5 The SLS function is acknowledged and the FSO stops the SLS monitoring. The SLS
active indication (parameter SLSx.15, SLSx.24, SLSx.34 or SLSx.44) goes off.
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