6.9 Safety function STO
A frequently required application task is the protection of personnel against the restarting
of drives. The S300 servo amplifier offers, even in the basic version, a single channel
STO function (Safe Torque Off) that can be used as a functional safe restart lock.
Advantages of the restart lock STO :
— the DC bus link remains charged up, since the mains supply line remains active
— only low voltages are switched, so there is no contact wear
— very little wiring is required
The safety function STO can be operated from a safe external control (semiconductor
output or driven contact).
The safetys concept is certified. The safety circuit concept for realizing the safety function
"Safe Torque Off" in the servo amplifiers S300 is suited for SIL CL 2 according to IEC
62061 and PLd according to ISO 13849-1.
6.9.1 Safety characteristic data
The subsystems (servo amplifiers) are totally described for safety technics with the
characteristic data SIL CL, PFH
D
and T
M
.
Device Operation mode EN 13849-1 EN 62061 PFH
D
[1/h] T
M
[Year]
STO-Enable single channel PLd SIL CL 2 1,50E-07 20
S300 Instructions Manual 37
Kollmorgen 02/2017 Technical description
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