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Thanks Onatirec, noted.

Thanks Gr8blue, edison123 and electricpete for all your information and advice, all noted.

Hi Hoxton, thanks for your advice.

Thanks, Mr. Che, it's a good advice, will try do that when the motor is offline.

Hi Pante, its about 10 to 15degress Celsius difference in normal operating condition.

Hi Waross, yes the cooling passage is fine, we checked and nothing wrong with it. I suspected to be faulty RTD but still unsure what really causing it.

From our siemens motor rated: 660V,900kw, 3Phase, 1492RPM, Ta: -20...+40 degree Celsius, I'm observing that one of the RTD (i.e., 5) Temperature is always increasing and triggers alarm everyday while the 5 other RTDs gives nominal reading. At one occasion, the motor trips when RTD 5 exceed...