INTRA Installation Manual
Contents
1. nadir File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 4 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 2 3 Overview of INTRA 2 3 1 Hardware Overview Figure 2 4 Block Diagram of INTRA The sun monitor and the controller board are integrated into the case of INTRA making it a compact unit that requires only an external power supply of 24 V DC nominal for autonomous operation Note that the clock RTC and memory RAM are powered with a back up power supply that allows them to operate also during power fails DATA 40DR BUS p o Q a The hardware of both axis primary and secondary are identical Both drives use a worm gear driven by a brushless DC motor and both axis carry an encoder disk that allows to decode the position of the axis with a resolution of better than 0 05 Each encoder disk includes an index mark that determines the hardware zero position of the axis File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 5 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 Figure 2 5 Determination of the zero position of an axis The horizontal axis has its zero at the position where the reference plane on its flange is horizontal while the other axis is exactly vertically positioned Note that this zero position does not necessarily coincide with the hardware zero of an axis although it is close to within a few degrees reference plane primary axi2. the case of the tracker Plug the connector into the power serial link socket on the drawer of the electronics Note All covers on INTRA do have dead end threaded holes in which you may screw a M5 screw to ease lift off of the cover File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 9 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 Figure 2 7 Location of sockets and fuse holder European projection sun monitor power amp serial I O secondary opto encoder primary opto encoder se 3 15A slow secondary axis motor primary axis motor Watch out that enough cable is available inside the tracker so it can rotate freely around its primary axis Note that the tracker is strong enough to cause considerable damage if its pulling on a cable either on the cable itself or on the drawer of the electronics if connector is locked Using the power connectors of the cable that comes with INTRA you connect its power socket to your laboratory power supply Do not switch it on yet Connect a PC with a terminal emulator program or a terminal to the serial interface socket Set your terminal to 9600 bps 8 data 1 stop bit no parity File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 10 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 If your tracker is configured with an RS 232C interface you may use the same type of cable you would use to interconnect two AT type PCs If
3. Installation of the Shading Disk Mechanism sssssssessenesenenenenenenenenenenenenenanenenenananananann 19 3 4 START UP PROCEDURE File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 1 Introduction Sun trackers for operational use generally do not run on active control Pointing accuracy is thus limited among other factors by installation errors It is not a trivial task to install a tracker with installation errors not exceeding let s say 0 5 degrees On the other hand actively controlled trackers while being very accurate during good weather conditions present start up problems and additional problems during unattended operation under cloudy conditions and are hence not well suited for operational use It was our intention to build a new solar tracker for operational use that would combine the advantages of both approaches and would avoid the drawbacks of either method The result of our effort INTRA does exactly this INTRA stands for intelligent tracker Its controller computes the position of the sun and it then points into this direction If the sun is not found exactly there this is due to a misalignment between the true alti azimuth system and the alti azimuth system of the tracker INTRA will now learn from the observed tracking errors and subsequently establish a transformation that allows it to transform co ordinates between the alt
4. cables depending on your needs All these cables enter the tracker through the opening of the flange which attaches to the pod 3 2 Setting up the Tracker Once you have mounted the pod according to the previous chapter all that is left to do is to mount the tracker on its pod You must mount the tracker in such a way that an instrument properly mounted on the flange of the secondary axis is looking approximately south 5 It is important that you use bolts made from stainless steal only and that you apply some grease to them This applies for the bolts you use to mount the tracker on its pod but also to any other bolts that you use to fasten your equipment instruments on the tracker Finally you complete the installation of INTRA by feeding the power serial link cable through the primary axis to the controller Make sure there is enough cable inside the housing of the tracker that it can rotate by at least 360 around the azimuth axis Fix the cable at the installation pod in a way that it can t be pulled out or even slip out by itself File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 14 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 Figure 3 1 This figure shows the fixation of the power serial link cable with a clamp at the installation pod Make sure that all openings of INTRA are closed in a way that no rain snow insects etc may enter the inside of INTRA Use waterproof covers f
5. to 180 or 180 which is the same position and set around 90 secondary axis 5 90 mode primary axis vertical and 180 turned primary axis 90 450 secondary axis 5 185 mode primary axis horizontal primary axis 90 90 secondary axis 200 200 If both axis are at position zero INTRA is pointing to the south point on the horizon In case INTRA reaches a limit of a range setting while following the sun it will move automatically to the alternate position in general INTRA has two sets of possible co ordinates to look at a celestial position e g p s and p 360 s Nevertheless this will take a little time less than 2 minutes because one of the axis will have to do a full rotation Warning INTRA and all devices installed on INTRA have to be mounted in such a way that both axis can rotate freely without causing a collision with any surrounding obstacle People standing close to INTRA have to keep in mind that getting in between the moving INTRA and any solid obstacle will be harmfull to the person and or the equipment Using the V command you write all installation parameters again V command to the EEPROM Exit installation menu X command enter clock menu L command Set time and date Universal time UT by using the T and D command Exit monitor X command type R0 0 lt cr gt INTRA will go to positions 0 0 0 0 Wait for INTRA to reach target positions This p
6. B R U S A G Sensorik amp messtechnische Entwicklungen Chapfwiesenstrasse 14 CH 8712 St fa Switzerland INTRA Installation Manual INTRA DOC 206 BRU Version 2 31 of 21 Jul 1998 Leonard and R Brusa ph 411 926 74 74 web www brusag chem rbrusa brusag ch fx 411 926 73 34 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 TABLE OF CONTENTS TDs INTRODUCTION skesis sicctasescesecsste eoi aseri aeie sds suacuecassuscessee bebdeesvbds cause csunctecossaese 1 2 GETTING ACQUAINTED WITH THE TRACKER ccscsssscsscssssssssocsccessscescassscocsssscsassssaccasscsassacscsassssaces 1 3 1 VERSIONS OF THE TRACKER 050 ae ee ee tt 1 2 2 CONVENTIONS AND DEFINITIONS 2 2 4 Alt Azimuth System auusenias as n nk enlene ca A EEEE NRE e AE AEE EANA 2 2 2 Azimuth over Elevation System 2 3 OVERVIEW OF INTRA ee 2 3 1 Hardware Overview 2 3 2 Firmware Overview a AE kdb BRAS EA ES TOERE N 2 4 FUNCTIONAL CHECKS AND FIRST STEPS FOR INSTALLATION ccccccccssscssecsssessecssesseecssesseecsseseeseeesasees 8 3 FIELDINSTALLATION usususssessnensssenenensessnsnsnssnsnensnssnenenenssssssnsnsnnensnsnsnsensnenenssssnsnensensnsnenssnsnsnenssssnsnsnsenenene 15 3 1 PREPARATION OF SITE use iin anne EAEE TEE ETETEA EE E 3 2 SETTING UP THE TRACKER 3 3 INSTALLATION OF INSTRUMENTS 3 3 1 Solar Pointing Instruments 3 3 2 Pyranometersi un iesse lt Dainese soe ES 3 3 3
7. Jul 98 3 Field Installation Warning INTRA and all devices installed on INTRA have to be mounted in such a way that both axis can rotate freely without colliding with any surrounding obstacle People close to INTRA have to take care that no movement of INTRA may do any harm to them We assume you followed the instructions given in chapter Functional Checks and First Steps for Installation and you have set both axis to position zero by specifying the command R0 0 Switch the power off and remove the power serial link cable INTRA is now ready to be installed at its final site 3 1 Preparation of Site We recommend that you prepare one of the pods shown in the appendix of the reference manual The pods are also available from BRUSAG It is best mounted on a heavy block of concrete Use a thick app 5 mm copper wire to connect the pod to a proper ground Of your site you should know which direction is south and you should mount then the pod accordingly An error of up to 5 degrees is not critical INTRA will automatically correct for this following the first few days with good weather conditions Similarly the quality of the horizontal alignment of the top plate of the pod is not critical We recommend that you align it better than within 1 As a minimum you will have two cables that go to the tracker Firstly the power serial link cable for INTRA and secondly the cable to your instrument s on INTRA There may be more
8. alent to a resulting maximum pointing error of less than 0 15 Still over extended periods of time the deviation of the RTC might reach critical values Therefore an additional feature has been included in INTRA s firmware It uses its knowledge of astronomy to keep its RTC on universal time with a maximum deviation a few seconds over years File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 6 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 The type of serial interface depends on the interface circuit s that are installed on the board If you remove circuits U8 LTC485 and U9 LTC485 but mount U25 MAX232 instead the interface will be RS232 C Without U25 but with U8 and U9 in place the interface is RS422 The hardware is also capable for RS485 but presently the firmware does not support RS485 2 3 2 Firmware Overview Upon power up INTRA checks if its the first power up If so it initialises the RTC to a default value clears possible RAM contents and reads in parameters from the EEPROM INTRA initialises its serial interface and is now ready to accept commands If its the first power up INTRA enters the remote mode INTRA defines the actual position of both axis as position 0 0 Because all informations about time date and position of the axis are lost or wrong INTRA waits for a new start up as described in chapter 4 4 Entering the clock mode or the sun mode befor
9. by using the T and D commands If INTRA has lost it s correct time informations because it was without power for longer than 12 hours enter this informations with the commands Thhmmss lt cr gt and Dddmmyy lt cr gt Enter the S or Ccommand to force INTRA into the sun or clock mode We recommend the sun mode at least during the first days following initial installation You may now disconnect your terminal You have given INTRA all informations it needs to track the sun for years Note If you want to keep connection to INTRA via modem we strongly recommend a modem which is capable to communicate with 9600 Bit s Otherwise it s not possible to update your software via modem line INTRA can track the sun using the clock or sun mode We recommended that you operate INTRA in sun mode because of the following reason INTRA will lock on the sun leading to a zero error on the sun monitor The current position is now read from the encoder circuits of each axis The position the tracker would have selected according to date time and site co ordinates is also known Hence deviations between target position and actual position are not contaminated by possible nonlinearities of the sun sensor and hence later analysis of the measurements for the case of large deviations will produce a more accurate result and hence a faster convergence Prior to let INTRA run without supervision keep in mind that and therefore it is important t
10. e ground File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 17 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 3 3 3 Installation of the Shading Disk Mechanism Figure 3 3 The shading disk mechanism lower part Gives the names of the parts and shows details on how the mechanism interfaces to the tracker File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 18 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 The mechanism has been partly disassembled for shipment Fig 3 3 helps you to identify its parts and gives you the overall look how the assembled mechanism should look In fig 3 4 you find further details that will help you during assembly of the shading disk itself assemble mechanism as shown in fig 3 3 and 3 4 Prior to mounting the shading disk mechanism to the tracker make sure that a the init procedure has been successfully completed mounting primary axis vertical In other words that INTRA does have valid co ordinates Entering the init mode after installing the shding disk mechanism will lead to demage the limits for the secondary axis are set to an interval smaller than 5 95 Forcing the altitude axis to a position exceeding this interval by several degrees will damage the mechanism it is not allowed to run the INTRA in the primary axis vertical and 180 turned mode when the shading disk is mounted This mode will damage the mechani
11. e a start up procedure would make no sense and could lead to a damage of INTRA and of the instruments mounted on INTRA If its not the first power up then INTRA enters operation using the RTC setting RAM contents etc as found INTRA is now depending on previous settings in one of the following 3 modes clock INTRA computes the position of the sun based on the date time information of its RTC Pointing errors are measured during the day and stored for later analysis If the sun disappears behind the mathematical horizon a rewind to the morning position of the tracker is performed Furthermore the pointing data gathered during the day are analysed and a new improved set of parameters for the installation errors Aw nw AOw is computed These data will be used the next day to compute more accurate positions of the sun sun INTRA uses the data of the sun monitor to actively control the pointing If the intensity drops below a certain level it falls temporarily back to clock mode In either mode pointing errors are determined and stored for later analysis The night time operation is as in clock mode We recommend to use this mode because it leads to the best pointing results especially during the period following initial installation remote Primary and secondary values are set by commands sent to INTRA using its serial interface No special operations are performed during the night in remote mode Note Primary and secondary
12. flanges A kit is available from BRUSAG to convert an INTRA to an INTRA II Cables to and from the instruments mounted on the flanges of the secondary axis are fed through the tubular axis into the case of the tracker There they are routed to the primary axis and exit the tracker at the fixed flange of the primary axis In order to facilitate handling of these cables INTRA has service openings File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 2 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 2 2 Conventions and Definitions There are several systems of co ordinates in use in astronomy The tracker uses the alti azimuth system of polar co ordinates Fig 2 2 and the azimuth over elevation system Note that the conventions remain the same whether the tracker is operated in the northern or in the southern hemisphere 2 2 1 Alti Azimuth System Figure 2 2 The alti azimuth system of polar co ordinates Shown is the projection of the celestial semi sphere centred at the site of the observer The projection is along the vertical through the observer hence the projection of the zenith Z is in the centre of the horizon circle A general point X on the celestial sohere is characterised by its azimuth angle A and its altitude angle a or distance to zenith z qw2 a A is measured on the horizon and is reckoned from the North South meridian The sign convention is such that direction West corresponds to an azi
13. hat you close the openings in the flanges of both axis with some suitable means The covers which are not facing upward need not be absolutely waterproof If a few drops of water enter an axis during a heavy rain this will do no harm to the tracker We have found that using a foam of app 5 cm thickness is adequate You cut somewhat oversized plugs out of the foam and then carve suitable openings into each plug that will allow you to feed cables through it Then you insert these plugs into the openings of the flanges Using open pore foam is advantageous because water vapour can pass through is Be shure no opening is left unclosed or small animals in special insects will enter INTRA Axis openings which are facing upward keep rotations in mind should be closed with a waterproof cover for instance a metal plate File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 21
14. he flange See Fig 3 2 for details Figure 3 2 Detail of mechanical interface A short tube that extends from the flange into a corresponding hole in the interface part allows for a precise positioning between interface and INTRA bolt M6 interface Feed the instrument cable s through the primary then secondary axis to the instruments Make sure that both axis may rotate within their full range File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 16 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 3 3 2 Pyranometers A pyranometer may be mounted on the top flange of the primary axis of an INTRA II or on an optional base plate which can be installed on an INTRA I Note that the shading disk mechanism the top flange base plate and the dimensions of the pyranometer must match each other for optimum results In general pyranometers are mounted with their instrument cable facing north on the northern or facing south on the southern hemisphere The top flange provides corresponding footprints cone groove flat for the pyranometer Feed the cable through the primary axis to the pyranometer on the top flange of the primary axis Note when using an INTRA II that the primary axis itself does not rotate hence you need no extra cable to take rotation into account The case of INTRA Il rotates around the primary axis The axis itself and hence the instrument on the top flange remains fixed with respect to th
15. he kind of installation of the fixed axis which will be further called primary axis If the primary axis is mounted vertical see figure 2 1a the tracker works in the alti azimuth system If the primary axis is mounted horizontal see figure 2 1b the tracker works in the azimuth over elevation system This term is not a good description because it suggests that both axis do not interfere which is not true File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 1 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 Figure 2 1 Two ways of mounting INTRA The left part of this figure shows the mounting of INTRA for the altitude over azimuth mode primary axis vertical The right part shows the mounting for the azimuth over elevation mode primary axis horizontal The wall to which the primary axis is attached is facing west The black spot on the flange of the secondary axis is the window of the sun sensor INTRA I has one flange on its secondary axis that will accept your instrument whereas INTRA II has two such flanges see cover page In addition the primary axis of INTRA II is fed through the case ending in a flange that remains fix while INTRA II rotates about its primary axis A shading disk mechanism comes with INTRA II and is also available for INTRA as an option INTRA II is particularly well suited to accept a shaded pyranometer on its top flange and a radiometer and sun photometers on its secondary
16. i azimuth system and its own system After INTRA has eliminated errors caused by installation this way it uses its knowledge about astronomy to control the real time clock This excludes errors caused by slowly increasing deviations of time The result will be a tracking that is as good as active tracking but avoids all the complications that active control presents for operational use This installation guide includes all informations that you have to know in order to successfully configure install and operate INTRA for your application Chapter 2 starts with an explanation of some basic concepts and terms and then proceeds with an overview of the operational modes of the tracker and finally guides you through some functional tests that may and should be done with the tracker following unpacking Chapter 3 explains step by step how the installation of INTRA is done The reference manual gives detailed description of the commands implemented in the firmware for users who are interested in deeper knowledge about INTRA Furthermore it contains the full specifications of INTRA and diverse drawings tables and diagrams 2 Getting acquainted with the Tracker 2 1 Versions of the Tracker INTRA is available in two versions INTRA and INTRA Il Common to both is that they are trackers that work in the alti azimuth system and in a system which is commonly called azimuth over elevation The decision in which system the tracker works is made by t
17. in A terminal or a PC with a terminal emulator program a cable for power and serial link see below When you receive INTRA it will in general have been sufficiently long without power to exhaust its back up supply capacitor Hence upon power up it will enter init mode But wait do not apply power yet First read the following few lines Each tracker is shipped in the following configuration Both axis are set to a position that is a few degrees positive of the hardware zero position Because the init mode firstly starts searching the hardware zero by rotating the axis in a negative direction this ensures a fast success of the init operation The serial interface is configured for 9600 bps 8 data and 1 stop bit no parity The site parameters in the EEPROM longitude latitude altitude a s are the ones of St fa Switzerland File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 8 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 The RTC will be set during init mode to a suitable date and time e g the version date time of the current firmware With INTRA you also receive a short 5 m cable with a FISCHER connector 10 pin on one end The wires at the other end of the cable have to be connected to the power supply and your serial link RS232 C or RS422 A In case you have an INTRA with heater option you have to connect two more wires see additional instructions This cable is i
18. muth of 2 or 90 N horizon File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 3 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 2 2 2 Azimuth over Elevation System In this System the primary axis is mounted parallel to the ground plane in the East West direction Although this system is generally termed azimuth over elevation this term is somewhat sloppy In fact its even wrong because the system of co ordinates has nothing in common anymore with the azimuth altitude system previously described It now makes sense to talk about a primary and a secondary axis or angle If we hold the primary axis fixed and rotate the secondary axis the result will be a great circle passing through the east and west points on the horizon Alternatively holding the secondary axis constant will produce circles that are centred on and perpendicular to the east west direction Figure 2 3 The Azimuth over Elevation System Shown is the celestial sphere at the site of the observer projected along the west east direction onto the plane of the north south meridian The north south meridian shows as a circle the horizon as a straight line separating the zenith and nadir hemispheres A general point X on the celestial sphere is characterised by the the primary angle p reckoned from the south point of the horizon and a secondary angle d n 2 s which is measured as angular distance d from the west point Z
19. ntended to be used as supply cable for functional checks in your lab and later for the final installation The isolation of the cable consistes of silicone which stayes flexible over the whole temperature range Therefore use only this cable For outdoor installation use a waterproof wirebox The following tables show the pin assignment of this cable Table 1a Pin Assignment for Power Serial Link Connector INTRA side Fisher connector plug 510 5 A 062 10 7 sleeve DB 105 A 062 The pin assignments of the serial interface connector depend on the interface configuration If U8 and U9 both LTC485 are removed and U25 Max232 is in place the interface is RS232 C If U8 and U9 are in place and U25 is removed the interface is RS422 Pins not shown in this table are no connection NC name pin description colours of wires Power Supply 24V 8 power supply red GND 9 ground power ground PE 10 protective earth violet Serial Interface RS232 C Rx 2 serial input to INTRA Tx 1 serial output from INTRA SGND 5 signal ground Serial Interface RS422A Rx 1 ser in low signal to INTRA Rx ser in high signal to INTRA SGND signal ground Tx ser in high signal to INTRA TX ser out high signal from INTRA Heater Option Hti 6 Ht2 7 You should ed the supply cable through the primary axis entering at the bottom flange of the primary axis You may then get access to the cable through the appropriate service opening in
20. ongitude latitude altitude a s I meters Do this by using the S command The altitude a s stands for above sea level is used by the program to compute expectation values for the intensity measured by the sun monitor as a function of air mass With the C command you choose the correction mode INTRA will use We recommend use of angle and time correction see reference With the M command you tell INTRA how it will be mounted primary axis vertical or horizontal see reference If you change the actual setting INTRA will also change the ranges of the axis and the three alignment parameters see reference manual according to the selected mounting All these changes are saved to the EEPROM automatically With the Ocommand you may check the installation settings Do the range settings meet your needs If required change the range settings with the Rcommand The set ranges command is a help for excluding certain angle zones under normal operating conditions This command is critical and is thus password protected File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 11 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 Note mode primary axis vertical primary axis For mid latitude southern sites you must change the range from its default 200 200 to 270 270 This is due to the fact that at mid latitude southern sites the sun would rise at an azimuth of app 90 move down
21. or openings which may be hit by rain directly Close other openings with foam which enables water vapour to leave the inside of INTRA Again connect a terminal and switch INTRA on Enter the monitor by typing MON lt cr gt Then type the kcommand twice This will enter the init mode INTRA again searches the zero positions of both axis This should be done before any instrument is mounted on INTRA The range settings mustn t exclude the zero points of the axis After INTRA has done the initialisation for both axis type any character to quit the init mode and exit the monitor by entering the Xcommand twice File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 15 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 3 3 Installation of Instruments For the installation of your instruments it might be helpful to force INTRA to look to the south point of the horizon You do this by entering the command R0 0 3 3 1 Solar Pointing Instruments Solar pointing instruments are interfaced by the customer to one of the flanges of the secondary axis Both flanges use the same pattern of mounting holes You find a drawing of the flange in the appendix of the Reference Manual The upper part of the mounting holes has a diameter of 8 mm with a narrow tolerance of H7 The thread M6 starts at a depth of 5 mm only This allows to design a mechanical part that can be mounted easily removed from and accurately be remounted onto t
22. osition will correspond to the south point on the horizon after INTRA is installed properly In case you are performing the installation continue now with the chapter Field Installation Type C lt cr gt This will force INTRA into clock mode It will now depending on date time and site parameters go to the appropriate position WARING Be aware that if you experiment with site parameters just to see what happens you will have to a adjust the range settings accordingly and b make sure that enough cable is available for the specified range While INTRA is moving you may interrogate its position using the P lt cr gt command Now you are in the ideal situation to familiarise yourself with INTRA We recommend that you now go through all the commands of the command decoder and through all the menus of the monitor See the Reference Manual for details But watch out there are some parameters the user should not modify Use the chapter Firmware Reference in the reference manual as your guide In case you inadvertently modified an important parameter even in the EEPROM you may restore factory parameters using the R command in the EEPROM menu of the monitor File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 12 BeReUeSeAeG File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC Doc No Version Date INTRA DOC 206 BRU 2 31 21 Jul 98 13 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21
23. s vertical The true zero position of either axis is determined at factory according to the method show in fig 2 5 The difference between hardware zero and true zero may be up to several degrees These values are stored in the EEPROM of the controller Note that the firmware reckons angles from the true zero and not from the hardware zero Let us conclude our overview of the hardware with some remarks concerning the control electronics The board is equipped with a circuit large capacity no battery to provide power back up for the RTC and the RAM The RTC will continue to run and the RAM will not lose its contents during power fails not exceeding 12 hours this is a worst case specification typically RTC and RAM remain ok during up to 24 hours The RTC uses a quartz which is specified to have a stability of better than 15 pom 25 C nom Temperature effects would degrade this value up to app 150 ppm in the temperature range 30 30 Therefore the quarz is characterised by BRUSAG We measure the deviation of its frequency from its nominal value and we also measure the change of its frequency as a function of temperature A temperature sensor is included on the circuit board of INTRA and firmware that corrects the RTC for accumulated drifts of the frequency of the quartz We estimate that typically an accuracy of the RTC in the order of a few ppm can is obtained Note 1 ppm corresponds to an error of 32 seconds per year equiv
24. sm mount base of mechanism to case of INTRA A flat surface on top of INTRA has been prepared for it adjust the height of the base in such a way to level the axis of rotation of the mechanism with the receiver area of the instrument command the secondary axis into a position of about 45 attach interface piece to secondary flange command secondary axis to position 0 loosen the three screws of the adjustable tie rod move the arm of the shading disk into the horizontal line fasten the screws again Attention Never enter init mode while shading mechanism is installed Otherwise several mechanical components will be distroyed This is also valid for the reinstallation after a long term power fail File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 19 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 Figure 3 4 a Assembly drawing of the shading disk Cross sectional drawing that gives details on how to assemble the shding disk PN SAIS SM 022022 Figure 3 4b Picture of the redy installed shading disk File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 20 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 3 4 Start up Procedure Once you have installed INTRA on its pod and mounted all the instruments on the tracker proceed as follows Connect a terminal and switch INTRA on if you have not already done Check date and time of RTC
25. values are measured in the astronomical system which is normaly slightly different from the tracker system installation errors computed by INTRA Note If the value of the secondary axis is near to 90 or 90 the tracker is near to it s singular points That means that a small movement on the celestial sphere may lead to large movements of the axis of INTRA A forth non operational mode the so called monitor mode is also available It is used to configure INTRA A detailed explanation of all the firmware commands is given in the Reference Manual File G PROJEKTE INTRA DOC DOCV231 INSTAL_206_V231 DOC 7 Doc No INTRA DOC 206 BRU BeReUeSeAeG Version 2 31 Date 21 Jul 98 2 4 Functional Checks and First Steps for Installation In the billowing we will describe some functional tests that you should perform with the tracker after receipt This will also be helpful to familiarise yourself with INTRA After the functional tests are done you use the same instructions to pre install INTRA in your lab This pre installation contains all steps you can and should perform before you install INTRA at its final site Figure 2 8 Positioning INTRA for tests in your lab sun monitor secondary service axis opening For these tests pre installation you should place the tracker on a table such that both axis may rotate freely as shown in fig 2 8 In order to perform the tests you need A laboratory power supply 24 V DC 2A m
26. your interface is RS422 or RS485 you will have to prepare a special cable Check table 1 and the documentation of your equipment for details For the routing of the cable the same arguments as outlined above for the power cable do apply Now switch power on Type MON lt cr gt INTRA should respond by displaying the main menu of its monitor you can find more about this in the reference manual In every level of the firmware you may type H to see the a summery of all commands you may select from the current level If INTRA does not respond check a your cable and b the communication parameters of your terminal emulator In the following we do not give details on the commands to be used For more informations see the reference manual Enter the password menu W command Use the tcommand to prove your identity The monitor will ask you for the password The password has been preset at factory to read CORONA you may and should change it if you want to use this safty feature After the monitor accepted your password you may also access protected menu items flagged with until you quit the monitor Enter the installation menu l command and force INTRA to perform an initialisation I command again Wait for done messages of both axis These messages must appear within less than 5 minutes See in the chapter on trouble shooting if this is not the case Still in the installation menu specify the parameters of your site l
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