Answer Posted / varun tripathi
1 lack of maintenance. bearings quality,focous on zero-2 motor assembly,
2 check no load amp.& compare with on load amp. it is in range as name
plate .check mech. s/m healthy
3 long servicing renderd of motors. also affect its insulation, rotors strips etc.
4 protection of relay with sute range.& power factor 0.8 = or greater
,supply voltage as need spcification
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