Basic Safety - Sto; Connection Diagram - Lenze i550 Series Mounting Instructions

Basic Safety - STO

DANGER!
With the "Safe torque off" (STO) function, no "emergency‑stop" can be executed according to EN 60204−1
without additional measures. There is no electrical isolation between the motor and inverter and no service
switch or maintenance switch!
Possible consequences: Death or severe injuries
▶ "Emergency stop" requires electrical isolation, e. g. via a central mains contactor.

Connection diagram

Active sensors
S1 Active sensor - example of lightgrid
Passive sensors
S1 Passive sensor
S2 Safety switching device
S2
S1
STO
S1
STO
S1 Passive sensor
Electrical installation
Functional safety
Basic Safety - STO
S1
+24 V 0 V
DC 24 V SELV/PELV
97