Motor burnt?
- Thread starter phatski
- Start date
- Status
To properly test a motor you need a megger.
Here is a thread that helps on the proper procedure:
http://forums.mikeholt.com/showthread.php?t=99238&highlight=megger
With the meter you have you can check for shorts to ground (case) but unless the motor is completley shorted it will not show up.
The megger will test for breakdown of insulation.
Here is a thread that helps on the proper procedure:
http://forums.mikeholt.com/showthread.php?t=99238&highlight=megger
With the meter you have you can check for shorts to ground (case) but unless the motor is completley shorted it will not show up.
The megger will test for breakdown of insulation.
ptonsparky
Tom
- Occupation
- EC - retired
A megger is the best but a lot, most, of the time all it takes is your nose.
rt66electric
Senior Member
- Location
- Oklahoma
flip on the breaker to see it if blows up!!!
flip on the breaker to see it if blows up!!!
Here are a few basic steps (assuming a AC induction Motor)
(1) check each lead to ground---- all should read open or infinit resistance
(2) depending on the type of motor (3 phase) The leads come in pairs or wound poles,( I would have to look in a book to tell which are which) there shoud be some resistance ,but not a direct short . The last motor I did was about 8ohms in each.
(3) there should not be any continuity between adjacent/other poles.
When all basic test are complete
(1) wire it up like the namplates sez
(2) flip on the breaker and see if she blows up
(3) basic troubleshooting is complete
(4) if she runs , then run her till she blows (lets all of the magic smoke out)
(5) if she blows , get a new motor and try again..
there is a youtube on HOW ITS MADE large electric motors.
flip on the breaker to see it if blows up!!!
Here are a few basic steps (assuming a AC induction Motor)
(1) check each lead to ground---- all should read open or infinit resistance
(2) depending on the type of motor (3 phase) The leads come in pairs or wound poles,( I would have to look in a book to tell which are which) there shoud be some resistance ,but not a direct short . The last motor I did was about 8ohms in each.
(3) there should not be any continuity between adjacent/other poles.
When all basic test are complete
(1) wire it up like the namplates sez
(2) flip on the breaker and see if she blows up
(3) basic troubleshooting is complete
(4) if she runs , then run her till she blows (lets all of the magic smoke out)
(5) if she blows , get a new motor and try again..
there is a youtube on HOW ITS MADE large electric motors.
zog
Senior Member
- Location
- Charlotte, NC
Really, thats how you T/S motors, just see if they blow up??
-Check bolted connection using a microhmeter
-Perform Insulation Resiatance test using a Megger, values depend on the motor type, size, and vintage
-Perform phase to phase stator wingin resistance tests using a winding resistance set
-Perform IR test on insulated bearings
These are for small LV motors, there are a few more tests for larger MV motors and other tests for something other than AC induction.
ptonsparky
Tom
- Occupation
- EC - retired
zog
Senior Member
- Location
- Charlotte, NC
Well you would test it as part of a testing job, a motor like you described should take about 15 minutes to test, so about $20.
ptonsparky
Tom
- Occupation
- EC - retired
Sold. I've got one you can sub out now. It's 25 miles away 30 foot up and forget the safety rail.:grin: Dress warm.
zog
Senior Member
- Location
- Charlotte, NC
OK, I will meet you out there at 6AM Friday. Don't be late.
Cold Fusion
Senior Member
- Location
- way north
zog
Senior Member
- Location
- Charlotte, NC
Like I said, part of a testing job so there would be multiple motors. Obviously you want one little 3/4 hp motor tested either do it yourself or buy a new one.
- Status