Help needed
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The screw compressor I’m looking at is used for transporting carbon dioxide. The unit operated fairly steadily, with a rotation speed of 7000±20 revolutions per minute. Two minutes before a fault occurred, the rotation speed dropped briefly to 6880 revolutions per minute before returning to its normal level. Two minutes later, the displacement of the screw shaft started to increase; it rose from -0.44 mm to -0.9 mm within 3 minutes, which triggered an automatic shutdown. By checking the trend charts, there were no changes in oil pressure, inlet and outlet pressures, or the pressure of the spray water. I’d like to know why the shaft displacement increased
There are significant issues with the manufacturing process. Is your motor variable-frequency? A large axial displacement is mostly caused by low suction pressure. Send a video to take a look.