Star delta testing help needed

[David Prosser]

I'm going for mechanical fault (or lack of maintenance) on the vacuum pump. Oil and filter candles need changing. Just a complete guess but as I can't see it, hear it, or test it I'm just having fun guessing.

 

[Kj14]

Are you talking IR or resistance testing

Are you talking IR or winding resistance testing

Winding resistance from the panel

 

[Pete999]

Winding resistance from the panel

At which contactors? you will need to identify the 6 cables going to the motor

 

[Kj14]

That's what I need to know I can see the star contactor and the delta contactor

 

[Deleted member 72666]

Check at the main contactor and the delta contactor not forgetting the o/l unit. Identify the windings U1 start and finish U2, V1 & V2 and finally W1 & W2, these should have the same value, don't be surprised at the very low impedance readings. Also check for leakage to earth from U, V and W. Don't forget to check the input voltage.
If all above are present and correct including what was said in #24, then it's almost certain a mechanical problem.

 

[Deleted member 72666]

That's what I need to know I can see the star contactor and the delta contactor

What was the outcome?

 

[theguz]

make sure all the contacts in the contactors are making . you might be losing a phase

 

[Deleted member 72666]

The fault has probably been fixed by someone else as the op not been back with any info.