Thread: Checking an electric motor before being able to power it

Can you physically turn it over?
If not connecting up the power will be sure to let the smoke out.

I'd be disconnecting it from the pump? and seeing if it turns over.

Then Megger it (insulation testing) if close to acceptable it might get better with a clean up but clean it up anyway

Then check the coil to coil resistance to see that they are the same.

If OK check if it starts and runs check the running current , if too high might not be worth pursuing.

Replace bearings and run it and see how hot it gets.

If you need help sing out!

Should be able to remove the top endcover and rotate the fan to see that pump and motor are free. Exposure may have allowed moisture into the top end bearing, or even the windings, so expect the top bearing to be noisy. Definitely get a megger (insulation) check done on the windings for peace of mind. Any indication which direction it should rotate? Pump will only work one way. Rotation can be reversed by swapping any two of the three input wires to motor or contactor. Good luck,
Combustor.

Cheers fellas, pulled my thumb out and took the cover off the fan, turns fairly easily, no telltale feeling of bad bearings.
Is the megger check able to be done without having to find a way into the windings?

Originally Posted by LordBug

Cheers fellas, pulled my thumb out and took the cover off the fan, turns fairly easily, no telltale feeling of bad bearings.
Is the megger check able to be done without having to find a way into the windings?

Yes the connection or terminal box is opened up and connections made between the coils and the earth - no need to open it up to the windings.
If you get stuck I'm happy to test it for you.