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Reply to "Screw Compressor Motor Overload Tripping"

All of the compressors should be seeing the same pressure at discharge if all valves are aligned correctly. I have a few questions to help troubleshoot. 1. Are all of the compressors set to the same discharge pressure set point? If so, do the pressure transducers or gauges all read the same? 2. Are these compressors variable speed or variable capacity? If so, are they staggered to have load picked up and shed in a sequential manner as system demand changes? 3. Do you have a system receiver tank to help minimize load fluctuations on the system? Discrepancies in any of these areas could be causing the problems you are seeing. If the smaller compressors are being used to "trim" the system, they could be cycling frequently and tripping because multiple starts in a short time are overheating the thermal overloads from repeated inrush current cycles in a short time period. If you can give me a little more information I believe that I can help you resolve the issue.

RM
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