CIM motor testing

[efoote868]

Originally Posted by Ether

Safety warning: If you decide to use such a setup, make sure to use a heavy-duty load switch and that is properly insulated/shielded (including cables). I'm not sure how much instantaneous voltage will be generated when the load switch is opened. Maybe someone (some adult) could test this. If the voltages are high enough to be a concern, a condenser (old-school term) -- like the ones that were used to keep the automobile distributor points from pitting back in the pre-electronic-ignition days -- could be placed across the load switch.

I think I'll use a speed controller instead of the power switch (bonus if it has current monitoring built in), and I don't have any intention of opening the load switch with the cim being tested under power. But if I absolutely have to do that, I'll probably invest in a contactor or snubber diodes to do it safely.