8 STO (safe torque off)
Notes concerning the circuit example
l The servo drive with an integrated STO function does not include any cross-circuit
detection. In the case of a direct wiring of light grids, the cross-circuit detection will
be performed by the light grid, provided that it is suitable for this purpose.
l The circuit example has a two-channel structure that is suitable for category 3 and
4 if additional measures are implemented. The additional measures depend on the
area of application and on the safety concept of the machine.
8.6.2 Deceleration and safe torque switch off
(SS1, "Safe Stop 1")
Figure 120: Circuit example "Deceleration and safe torque switch-off"
(SS1, "Safe Stop 1") (single-phase servo drive)
Pos. Description
1 Servo drive with an integrated STO function (only the relevant connect ions are
shown)
2a Emergency stop button
2b Safety gate
2c Light grid
3 Safety relay K1 with a delayed output
Product manual BL 4000-C Page 202 of 298
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