[thingstodo]

Wiring was completed last night.

Turned it on and the fuse on the PLC output card blew. The shunt resistor limited the current to 25.2V / 1.6 ohms = 15.75 amps if there is no resistance in the load.

The fuse that blew was a 10 amp slow-blow. The 5A self-resetting fuse is still in the circuit ... I messed something up.

Perhaps I don't need to control the speed of the grinder with the PLC. I can test basic stuff with a display, then use the variac to change the speed of the grinder ... until I track down my wiring error. Perhaps it isn't an error in wiring, but an error in how I expected the PLC output to act.

I will go through my assumptions and test a few things on low-current loads ... tomorrow