SOLAR_MODE_TRACKING¶
| Available as of PLC runtime system: | V1.3 and above |
| Included in library: | Solar_AC500_V22.lib |
| Type | Type_Function_Block_No_History |
| Group | Package of Function Blocks for different control modes |
This Function Block represents an operation mode that allows to track the sun based on a calculated sun position. This position is given by an SOLAR_NOAA algorithm depending on date, latitude and longitude.
This Function Block calculates the absolute difference between the calculated sun position and the actual tracker position. If the result is greater than the value of track error (TRACK_ERR), system moves to the calculated position. Otherwise, system is stopped.
The picture below shows how this operation mode works.
Figure below shows the logical sequence that implements SOLAR_MODE_TRACKING:
It is possible to follow sun´s path with an offset. This value is indicated by the parameter FOLLOW_OFFSET.
Figure below shows the logical sequence that implements SOLAR_MODE_TRACKING adding an offset value.
Note
Tracker follows the sun by using a discontinuous movement. It is a step by step movement in order to save energy from actuators.
Chart below shows real behaviour of azimuth tracker when is enabled SOLAR_MODE_TRACKING. In this case TRACK_ERROR = 0,05°.
Red line -> Calculated position using SOLAR_NOAA algorithm.
Blue line -> Actual axis position.