One of the over looked problems i see when a engineer is fitting a motor back on a machine is not checking they have 3 phase through the circuit breaker switch, and contactor. Also checking the cable to the motor for damage.
When fault finding in the field I never remove the links and always start with a insulation test. Most motors fail to earth. No need to carry out more tests. Start with the black lead on a earth point and the red lead on another earth point, this test your leads and earth point. then use use the red lead for the winding tests. When tests complete retest the red lead back to a earth point.
If the motor is 415V, I understand each phase is only 230V rms to neutral/earth. So a 500VDC IR test to chassis makes sense. But why wouldn't you test between phases at 1kV? 415Vrms is 587V peak, which is admittedly only the peak value, but you're not checking that for the duration of the peak the insulation is not breaking down. So a 500VDC IR to chassis and then 1kVDC IR between phases would be correct?
In waste management, no problems lol. I guess depends where you are and who is hiring, im teaching to apprentices in the UK so difficult to tell in the real world but your experience is a definite plus if you happy to retrain. I wish you luck in finding somewhere.
A very good explanation, easy to follow. Will use this video for my teaching sessions.
סמי הכבאי
Thanks for sharing this with us
Nice and simple illustration❤
Excellent video, complete and concise, Thank You.
Is there a mistake with the illustration at 4:23? Shouldn't the last test be at the bottom far right terminal?
thank you very much great video
Great video!
One of the over looked problems i see when a engineer is fitting a motor back on a machine is not checking they have 3 phase through the circuit breaker switch, and contactor. Also checking the cable to the motor for damage.
You see. A engineer has zero experience actually fixing the things they create.
Very helpful. Thanks v much
When fault finding in the field I never remove the links and always start with a insulation test. Most motors fail to earth. No need to carry out more tests. Start with the black lead on a earth point and the red lead on another earth point, this test your leads and earth point. then use use the red lead for the winding tests. When tests complete retest the red lead back to a earth point.
If the motor is 415V, I understand each phase is only 230V rms to neutral/earth. So a 500VDC IR test to chassis makes sense.
But why wouldn't you test between phases at 1kV?
415Vrms is 587V peak, which is admittedly only the peak value, but you're not checking that for the duration of the peak the insulation is not breaking down.
So a 500VDC IR to chassis and then 1kVDC IR between phases would be correct?
That's great
Great detailed clear explanation!
Nice 👍
Useful
Very nice broo
Hey can you teach me more about motors
Quick question. Can a commercial installation electrician with 22 years experience move into industrial maintenance?
In waste management, no problems lol.
I guess depends where you are and who is hiring, im teaching to apprentices in the UK so difficult to tell in the real world but your experience is a definite plus if you happy to retrain. I wish you luck in finding somewhere.
If you can install industrial or commercial electrics you can therefore maintain them.
Yes.