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MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018
18
3-4 Multiple Motor/Pump Units
For applications that require large thrust/torque output or fast stroking speeds it is possible a secondary
motor/pump unit will be used in tandem with a standard HPS. The secondary power unit pumps a large
volume of hydraulic fluid to move large displacement cylinders quickly, while the smaller displacement
HPS pump maintains the ability to provide fine positioning.
The system operates on the principal that both motor/pumps operate when large actuator movements
are required, but only the HPS motor/pump operates for smaller movements. In addition, even when the
secondary motor/pump is used it is de-energized prior to completion of the actuator movement and the
HPS alone is responsible for the final, fine positioning.
Using the large, secondary pump only would create excess mechanical gain in the actuator system and
would require a proportionally larger deadband to maintain controllability, while using the HPS alone
would provide the fine positioning required, but would not deliver the stroking speeds needed. The
solution is to utilize both a large displacement and small displacement pump in the same system utilizing
the advantages of both and neutralizing the disadvantages of using either individually.
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