Safety functions 105
Step Description
1 The SS1 request is received (for example, from the I/O). The drive starts to ramp down
the motor speed. SAR1 parameter 200.112 defines the deceleration ramp. The FSO
starts the SAR1 ramp monitoring (parameters SARx.21 and SARx.22).
Note: If parameter 200.112 has value 0, the drive (parameter 23.23) defines the ramp.
2 The drive trips on a fault or user stops the drive, modulation of the drive stops. FSO
module activates the STO function and STO indication (parameter STO.21 STO
output).
SAR1 ramp monitoring goes off.
See section Safe torque off (STO) on page 67 for more information on how to configure
the STO function.
Note: If STO is used in cascaded system (see Cascade on page 62), it will not be
activated in the whole system in this case.
Note: SS1 completed indication (SS1.22) is used instead of STO completed indication
(STO.22) in this case
Note: If the SBC is configured in the STO function, also the SBC is activated according
to the configuration (not shown in the figure).
3The SS1 completed output indication (parameter SS1.22) goes on and the
acknowledgement becomes allowed as soon as the SS1 request has been removed.
SS1 function can be acknowledged when STO.14 delay has elapsed after the drive
modulation is lost.
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