Safety Integrated - Industry - Siemens

Ex. No.
2.7
Safe standstill for several non-interlocked protective doors and several drives, Emergency Stop implemented using
safety combinations
Minimum circuit for the "safe standstill" with SIMODRIVE function
Function description
A structure in compliance with EN 954-1 control Category 3 and
EN 1037 can be implemented using four SIGUARD safety combinations
for Emergency Stop and protective doors. The drives are
shut down (stopped) according to stop function Category 1 according
to EN 60204-1.
■ Safety combinations for Emergency Stop and protective door
monitoring functions correspond to Category 4 (instantaneous
enable circuit) or Category 3 (delayed enable circuit).
■ Circuits for Emergency Stop and protective door monitoring
are monitored through 2 channels in a cross-circuit proof fashion.
424 Functional Example No. MC-FE-I-002-V11-EN
■ Switches S3 and S8 are positively opening position switches
corresponding to EN 1088.
■ The drives are shut down via the internal safety relays.
■ The on circuits of the safety combinations A1 to A4 monitor
whether the internal line contactor of the rectifier unit has
dropped-out after and Emergency Stop or whether time relay
K2a/b and contactors K3a/b have dropped-out after opening
the protective door circuits (this is necessary is the sense of
control Category 3 according to EN 954-1!).