Wednesday, June 14, 2017

Hydraulic Power Unit’s Use VFD Technology to Run More Efficiently

Dave Maloney

Project Engineer

As you know, Hydraulic Power Units exhibit optimized performance through variable frequency drive technology. The Hope Group was recently challenged by a major defense contractor to build a robust power unit that required large flows at high pressure to actuate a number of linear and rotary devices. A requirement of 400 GPM @ 3000 psi to satisfy all movements in the correct time was derived and the system had to ramp from 0 to 400 GPM in 160 milliseconds.

Realizing the sophistication of its customer, the THG team developed a written analysis that addressed the total cost of ownership for two possible options. One option being to satisfy the instant flow requirement with a bank of over twenty, 10-gallon accumulators and gas bottles. The second option was to incorporate four 150 horsepower VFD drive electric motors that would drive four Parker PV 270 pumps. The second option resulted in more efficiency, response, and energy savings.(To read about the project in detail, view the case study)

VFD Technology improves hydraulic power unit performance and saves energy (which also means saving money). Some other popular HPU applications that would benefit from this technology are metal forming presses, stamping presses, die casting machines, rubber forming presses, accumulator charging and wood presses. Being one of Parker's Hydraulic Technology Centers, The Hope Group has the capability to engineer the most efficient hydraulic power unit using VFD Technology. (Check out the Parker blog posted by the Parker Electromechanical Team that demonstrates another case study and its’ challenges).

The Hope Group and Parker Hannifin assist customers in running their HPU's more efficiently, reducing energy and improving productivity by offering VFD technology products and expertise. If you need assistance or have an inquiry, please contact me at 508-351-1859 or by email ( We can help you select proper components, design a system (or work from your design), fabricate a skid-mounted unit, witness test, and field install.

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