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Not sure if you got this working but based on my experiences with simovert it does check if the main contacter is off when it should be off and on when it should be on. It does that by measuring the voltage over the relay coil.
 

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Where would the pre-charge resistor go? Where can I find one?

Did you even look into the Siemens documentation and connection diagrams ?


The pre-charge R is connected in parallel over the main relay and controlled by a seperate pre-charge relay from the Simovert
After power-on the pre-charge relay is closed by the Simovert and it expects the voltage on its main terminal to rise up to a minimum voltage within 3seconds.
If this happens it will measure the voltage over the main relay coil. If the relay is open you are allowed to start.
If you apply start it will close the main relay.


This all happens with respect to timeouts, voltages etc etc.
If this all sounds difficult or strange to you i strongly recommend to stop what you are doing and acquire the proper knowledge before blowing up stuff.
 
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