Vacuum Pumps The installation of a Variable Acceleration Drive (VSD), sometimes called a adjustable frequency drive, usually saves between 50 and 65% in electrical power costs with the same or better regulation of vacuum. The range of energy Energy-Conserving Vacuum Pump savings could be from 30 to 80 percent. They may be adapted to blower or in some instances rotary vane type vacuum pumps. They work by changing the quickness of the vacuum pump based on the reading from a pressure sensor that is installed on the vacuum collection close to the receiver jar. The VSD is actually a dedicated pc with many adjustments so it might be possible to boost vacuum regulation over the normal pneumatic vacuum regulator that only includes a vacuum level adjustment. A VSD for a vacuum pump is usually cost-effective for a dairy that milks a total of 8 hours or more per day. Typically a VSD will not be a cost-effective option for little dairies due to less milking time and thus shorter vacuum pump operate times but there are several other options to save energy costs.