Analog Guy ST1-20A +RS1 light seeking tracker control DC motor linear actuator
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NEW The Analog Guy ST1-20A Single axis 20A ight seeking tracker control for DC motors/linear actuators with RS1 remote sensor


The ST1-20A is a light seeking tracker control designed for DC motor systems (typically linear actuators) with up to 48VDC maximum operating voltage (minimum operating voltage=10VDC).  In unobstructed sunlight it typically tracks within 0.25 degree of actual sun position.

           ST1-20A         Basic light tracking configuration.  Maximum motor current is 20 Amps, Single Axis Version

Included Accessories:
RS1: Single Axis weatherproof remote sensor with 10 ft (3m) cable.  

For more information, click here to view the datasheet


The following normal operating modes apply:
  • 1)       Useable sun-the unit points toward highest illumination, which is usually the suns disk but may be the brightest part of the sky During variable cloud conditions.
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  • 2)      Mostly obscured sun (e.g. cumulous clouds with breaks)-unit pauses at last valid control point to wait for conditions to change.
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  • 3)      Heavy overcast or night-unit moves to park position to await light level recovery.
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The PARK position is determined by S1-2 (East or West) and S1-3 (V=array vertical, HORIZ=array horizontal).



Abnormal conditions-typically, motor failure or mechanical system jam:

Tracker will attempt to move the array.  If motor overcurrent condition is sensed, tracker will terminate drive and flash the PAUSE LED.



Indicators on the control PCB:  PWR, PRK, PAUSE, E/W DRIVE, UP/DN DRIVE.



Notes on initial installation, power up and adjustments.



The remote sensor needs to be attached to the array frame such that the mounting surface of the sensor is parallel with the plane of the array-where on the array is not critical as long as the sensor receives unobstructed sun during the hours when the array is expected to track.



One second after power is applied, the tracker is active.  If the ambient light level is above the track threshold, it will then commence tracking.



There are three trimpot adjustments, two are for tracking accuracy and are used to compensate for component variations and slight misalignments of the remote sensor.  The third is to adjust the light level at which the tracker control changes from track to pause and pause to park-this single adjustment is for both the pause and park threshold-theyre approximately proportional.

Trimpot sensibilities:

                                    Light Level-Clockwise for lighter Pause/Park threshold.

                                    Position trim E/W-Clockwise for West.

                                    Position trim UP/DN-Clockwise for Down (toward horizon).



S1-1 (DLY) on the PCB controls the delay function.  The idea here is that, during the initial installation, this is in the OFF position.  In this state, everything happens instantaneously-a useful condition when tweaking the track trimpots and setting the PAUSE/PARK threshold.  When the DLY switch is in the ON position (for normal, unattended operation), the following delays are added to the system operation:

          

      A ten second delay is added to tracking corrections so that a requirement for a position change must remain constant for 10 seconds to be considered valid.  This is to reject transient events such as something flying over the sensor and, in cases where the sensor is shaded by moving vegetation during part of the tracking day, to hold off and/or reduce movement during back and forth shading events which arent representative of true sun position and are not dark enough to invoke the PAUSE function.



      A ten minute delay is added to the change from PAUSE to PARK.  This is for conditions of changing cloud cover (where the sun occasionally pokes through) to keep the tracker from sending the array back and forth between PARK and TRACK positions.  Light conditions must remain below PARK threshold for 10 minutes or more before the controller will allow movement.  (There is only a 10 second delay when changing from PARK to TRACK.)



The tracker control PCB needs to be housed indoors or in a weatherproof enclosure.

the ST1 is new and factory sealed. the rs1 appears unused.
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