Sto Via Power Module Terminals - Siemens SINAMICS PM240-2 Hardware Installation Manual

5.3

STO via Power Module terminals

With Power Modules, frame sizes
FSD ... FSF, you can implement the "Safe
Torque Off" (STO) safety function, corre-
sponding to PL e according to EN 13849-1
and SIL 3 to IEC61508.
You have two terminal blocks - STO(A) and
STO(B) - and two DIP switches at the front of
the Power Module.
To be able to use the safety functions, you
must enable the terminals; you do this by
setting the two DIP switches to ON. You can
only use the safety function if both DIP
switches are set to ON.
Set both DIP switches to OFF if you do not wish to use STO. If one switch is set to OFF and
the other to ON, the inverter signals that the pulses are inhibited, and the motor does not
start.
The terminals are low active.
Further information and wiring examples:
STO connection
Use shielded cables with a maximum length of 30 m, a cross-section of 0.5 mm
(20 ... 16 AWG), insulated for 600 V. Connect the shield to the shield plate of the Control
Unit through the largest possible surface area.
Use conductor end sleeves, stripped length 7 mm.
Note
Safety functions via the Control Unit
You can implement the safety functions via the Control Unit independent of the safety
function "STO via the Power Module terminals".
Power Module PM240-2
Hardware Installation Manual, 01/2017, A5E33294624B AE
5.3 STO via Power Module terminals
Manuals for your inverter (Page 133)
Connecting-up
... 1.5 mm
2 2
57