Functional safety
13.5 Application examples
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
717
STO application with circuit breaker
①
First channel (blue): Circuit breaker (3WL) ar armature auxiliary contactor
②
Second channel (red): Firing pulse circuit, SAFETY circuit
③
Safety components (green)
④
Contact blocks for field excitation (gray): Line contactor field + field auxiliary contactor (also as the field contactor is
usually controlled as well)
Figure 13-4 STO application with circuit breaker