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Figure7-27 Parallel connection of two relays
If two relays are connected in parallel, the converter detects the following faults:
• Cross circuit between the F-DO terminals
The converter switches the relays o if there is a cross circuit.
The converter outputs dark pulses for cross-circuit detection. The dark pulses are staggered
for F-DO0+ and F-DO0-.
• Wire break between the F-DO terminals and the two relays
A wire break always leads to a safe state as at least one relay switches o.
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Figure7-28 Connection of a valve with a feedback signal
Connecting
7.2Interfaces for the controller
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 189
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