Emad ,
What is motor rpm ? Is the Ammeter electronic or electromechanical. If it is an old one with a moving coil, you can see if there are current oscillations. If there are, that can be a good sign that there is a problem with rotor cage. 100 Hz oscillations can be a sign of not equal...
...I would be a millionaire. Recently, colleagues reported an electrical problem with 1,1 MW DC motor due to large vibrations, so we spent a lot of time checking motor and old analog DC regulator. Finaly then we asked them to turn off DC switch at rotor and excitation winding two seconds...
I used this technique 20 years ago with old SKF CMVA 60 instrument. Today there are many others that offer current analysis in one or all three phases of AC motor , so you have to do a little research. I am attaching a document of SKF on how it work and how vibration diagnostics can together...
There is probably a problem with breaking some rod on the rotor. This can be detected reliably when motor is running under load using the Motor Current Signature Analysis method or vibrodiagnostics .
This is data from Siemens website.
There are definitely differences in the voltage and power itself, ie the choice of Smart Line Module (SLM) or Active Line Module (ALM) -
It seems that someone brave simply need to pull out the 2.2 mm shimps from the lower pole and insert it under the upper one. But that is not case because sometimes it is important disposition of shimps respecting they are made of magnetic or non-magnetic material.
Good luck
I was on the road and did not provide minimum information related to my question
It's about 6kV ,3,5MW motor that was talked about a lot and it was used to drive the fan .
Link
Now it is considers that this motor should be used to drive one pump where we have motors with same voltage and...
Hello everyone ,
I recently saw at manual for Westinghouse High voltage motor that as starting method was given soft starter only . In your opinion, what should be structural difference compared to the motor with a DOL start .
TT ,
A good question for maintenance is whether someone has been working on something at high voltage and whether there was perhaps a phase change and consequently change direction of rotation of the motor.
Is there a time delay between the release of star contactor and activation of delta contactor. Often, a small time delay is solution to solve problem if large currents occur at that moment .
Since the motor was replaced, winding connection should definitely be checked .
Good luck .
You should look at the expected starting current of the motor, bearing in mind that newer motors with improved efficiency have a higher starting current of 10 IN.
Then this four-pole distribution switch could be tripped by its characteristic .
