For precise East-to-West tracking, SPFB relies on multiple variables and inputs. These include atmospheric pressure, site elevation, azimuth, latitude, longitude, date and local time. Calculations are then paired with the internal clock of a WAGO Programmable Fieldbus Controller, optimizing mirror position. Data is communicated to a connected WAGO DC Motor Control Module and encoder, or other component (e.g., variable frequency drive) for alignment.

Unlike many traditional sensor-driven systems, WAGO SPFB provides remote access and manual control by linking to a central PC via fieldbus. System status/alarms are available via e-mail, and a “stow” feature positions panels horizontally (wind) or vertically (snow), reducing stress during inclement weather.

SPFB was developed in-house utilizing data from both the U.S. National Resource Energy Laboratory, and the 2011 Astronomical Almanac produced by the U.S. Naval Observatory and H.M. Nautical Almanac Office.

WAGO’s free Solar Tracking Function Block is also available. It allows the WAGO-I/O-SYSTEM to align PV panels with the sun, for 30% more energy production than fixed panels.

www.wago.com