You need to check that they are all adjusted correctly. It now checks that the full circle is complete, and if that fails they will not work.
Also, this check is only done on server start atm, so once you have everything working, you need to close the world and reload it.
In the dragonapi config, there is an option for TAB to show NBT data, turn that on.
Hold tab when looking at toroids. You need:
Next=1b
Solenoid=1b
If either of those is 0, it will not work.
Next is the completeness check, and solenoid is obviously checking the solenoid is there and working.
Charge and coolant is anything over 0. You need a lot of LN2 to keep up, and very little charge. ( 2dc engines can manage for the entire ring.)