The plunger pump motor will not rotate
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This post was last edited by Mechanical elementary school student on 2017-7-12 at 10:02. Our facility has newly installed two three-cylinder piston pumps. During the trial operation phase, after starting up, the motors would rotate at low speed for a while before stopping (the fluid used in the pumps is water, the back pressure is 5 MPa; it’s variable-frequency pumps, and at startup frequencies of 30%, 50%, and 70%, the motors would stop rotating). All that could be heard was a screeching sound from the motors, and the current consumption was also high, but the motors simply wouldn’t rotate； When the drain valve was opened, the pump operated normally; the pump did not have a return line installed. There is a gear reduction between the motor and the pump; could everyone please help analyze the reason? Thank you! ! !
1. Check for sticking issues. 2. Check the motor condition. 3. Check the gearbox
It is likely that there is pressure at the pump’s outlet at startup, resulting in an excessive starting load and insufficient motor torque. First, close the pump outlet valve and open the outlet drain valve; once the pipes have been vented, close the drain valve again. After pressure builds up, slowly open the pump outlet valve.