I have moved a three phase electrically powered hydraulic machine from one position to another and now it will not operate. What is wrong?
A. Hydraulic pumps operate correctly with their drive shaft rotating in one direction only. Electric motors can easily rotate in either direction with the reversal of any two electrical phases. Three phase electrical outlet sockets have no commonality with phase rotations. Therefore, moving hydraulic equipment from one electrical outlet to another could cause the equipment to malfunction. With the equipment plugged into an alternative location, it is possible for the electric motor to rotate in an opposite direction. Rotating the pump backwards (sucking instead of blowing) causes the operational fault. The fix is an easy one for a certified electrician. Exchanging any two electrical phases will cause the pump to operate as designed.
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