Hatchy
23-02-2012, 09:45 AM
Hi,
I have an old plant. Large motor (75HP I think) running a Trane compressor on a chiller for AC. Motor not going and I have isolated problem back to a Crompton Parkinson Cat No 187-120027 Temp Switch. I have power on Common to NC. Bridged Common to NO as test and motor fired up. Does anybody have info on this control. I am getting 120V on thermistor terminals. Motor re-wound 6 mths ago and hope not damaged. Any idea's what I should be looking at. Not familiar with this old control that must be 35yr old.
BTW. Motor sounded a bit rough last time on site. Was getting a Harmonic up-down noise.
I have an old plant. Large motor (75HP I think) running a Trane compressor on a chiller for AC. Motor not going and I have isolated problem back to a Crompton Parkinson Cat No 187-120027 Temp Switch. I have power on Common to NC. Bridged Common to NO as test and motor fired up. Does anybody have info on this control. I am getting 120V on thermistor terminals. Motor re-wound 6 mths ago and hope not damaged. Any idea's what I should be looking at. Not familiar with this old control that must be 35yr old.
BTW. Motor sounded a bit rough last time on site. Was getting a Harmonic up-down noise.