is a micro-processor-guided controller which contains the positioning logic as well as the power unit for the relais and also for smaller motors. It is possible to drive two seperate relais/motors (max 2.5 A/axis) with dual backfeed-pulse-sensors one for the elevation axis, one for the azimuth axis. The relais/motors are actuated by relais (semiconductor-version on request).
The positioning procedures onto the sun are calculated with a comprehensive astronomical program. Therefor the Kepler data of sun and earth as well as date and time and the system's location have been involved.
- with up to 90 degrees elevation-swing
- with up to 360 degrees azimuth turn angle
- with 40 characters LC display
with lots of dynamic operational information in the display:
- optional analog-level
- and many more
- direction of move
- with quartz controlled calendar clock
- with programmable angle limits
- with battery-backed buffered memory
- with auto-start after mains failure
- with wind-sensor-interface
The complete control is implemented in the frontsided key panel (image B).
This device can be delivered for use with 230/115 V AC or 24 V DC.
- linear feedback pulse for movement angle ratio (Optional by a collecting system for nonlinear "feedback pulse for movement angles" can be provided.)
- dual bipolar feedback pulse system
- feedback pulse frequency: max. 200 Hz
- feedback pulse length: min. 2.5 mSek.
- max. resolution: 65000 pulses/axis (speak with us about the choice for a resolution!)
- one orientation-switch per axis
Installation sequence: When mounting the load to be positioned mechanically (PV-panel, collector, measuring sonde etc.), the mechanical assembly has to be aligned roughly into the north-south direction only. Merely 4 parameters are to be entered after that:
1. The motor's "pulse to movement angle ratio".
2. The geographical coordinates of the installations location (longitude and latitude).
3. Time and date (UT). (The consideration of leap-years, the true local time calculation and the calculation of the sun-coordinates are performed full-automatically. Any re-adjustment of the internal clock is not required, when the time shifts from summertime to wintertime).
4. Tracking-frequency/-intervals or tracking-angles selection (max. allowable angle-deviation).
The load to be positioned now is turned/driven directly into the sun-optimum with the four keys (UP/DOWN/EAST/WEST).
After starting the system follows the sun day by day completely automatic. If the sun leaves the angle-limits set by you, the rotor waits in his night-inoperative position for the next day and starts again his daily work in the right moment and at the right spot.
To use the rest-light after sunset, the user determinates, how long the system holds out in this position after sunset. This happens correspondingly at sunrise. Equally any park/night position can be programmed freely.
By clever setting the max. allowable angle-deviation or the next search-cycle, the system can be influenced motor sparing.
Of course, you may drive to any desired position with such a system: Look at the display, watch AZ- and EL-angle; push right-left up-down as you like. Min. step size 0.1°!
Wind-sensor-pulses can be transmitted to the control logic via the wind-sensor-interface for an automatic evaluation. This is used to drive to a programmable motor-/gear-position automatically, when a selectable wind speed threshold is exceeded (image G)!
If the control system should drive the 24 V DC motors directly, a semiconductor-relais-version instead of mechanical relais can be delivered. This version then allows:
- softer starting and stopping of the motors
- no loss of contact due to contactless mechanical switching
- less vulnerable to operational interruptions due to no switching or tear off spark formation
- noiseless control device due to no movable parts
- accomplished two-speeds-operation, because semiconductors can be switched on and off highfrequently,
- because it is possible to drive different speeds using semiconductor switches