Answer / satya rout (oeg rr)

A new 3ph IM check some following stepssss.
1.check bearing status
2.winding insulation resistance
3.check earth leakage current
4.check supply connection input (RYB) =output(RYB) is same.
basically phase inter-change is main reason for rotets the bello speed

Answer / ashok k

This is due to Slip also. Anther possible reason broken short circuited rotor ring or Rotor lamination may be broken.

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