Functional safety
13.5 Application examples
SINAMICS DCM DC Converter
716 Operating Instructions, 12/2018, A5E34763375A
STO application with line contactor
First channel (blue): Line contactor armature + armature auxiliary contactor
Second channel (red): Firing pulse circuit, SAFETY circuit
Safety components (green)
Contact blocks for field excitation (gray): Line contactor field + field auxiliary contactor (also as the field contactor is
usually controlled as well)
Figure 13-3 STO application with line contactor