Pump Drive Eliminates Pressure “Overshoot”

The SVP 7010 variable-speed pump drive from Bosch Rexroth expands the Sytronix family of drives with a comprehensive selection of hydraulic-specific functions. The servodrive integrates high control accuracy and dynamics, which in the past required proportional or servo valve technology. The control can eliminate pressure “overshoot” and position linear axes to a high degree of accuracy, without instability, the company says. Additionally, algorithms allow for the reduction of pressure ripple inherent in certain pump designs. These pre-programmed features can simplify installation, and control features such as the Productivity Agent monitor the machine to ease maintenance.

With power ranging to 120 kW, the pump drive is ideal for a range of machine applications. A direct coupled motor/pump assembly shortens the overall length by 20 percent and reduces the inertia of the drive by as much as half, boosting dynamics. The SVP 7010 drive can be used in both open- and closed-loop hydraulic circuits. Pumps for two- or four-quadrant operation are available, with three levels of performance to fit nearly any machine configuration.

The drive’s pump speed reduction during idle and partial load operation can result in energy savings as high as 80 percent as compared to conventional drive technologies, the company says. Drive regeneration or interconnecting multiple drives with overlapping machine cycles can provide additional energy savings. Energy storage using capacitor banks or kinetic storage regenerated during deceleration and braking motions can be used in other portions of a machine’s cycle. Additionally, the drive contributes to quieter operation.