Druck ADTS 405/405F - GE Measurement & Control
Contents
1. Ps 1813 25 mbar Bim 1813 25 lt PL 3199 91 mbar Dis 300000 J remove Tha PANEL FOR PRINTER CONNECTOR Een COCCI N Figure 1 2 General view K171 Issue No 1 Page 1 3 Druck ADTS 405 Service Manual SPECIFICATION e ere Kee E 88 to 260V a c O 47 to 440Hz TEE 200 VA maximum ADTS HOSF nn sarten tette eben toti ete tkt LASSE RE ENGE HE dicci n 500VA maximum Pneumatic outputs Atitude range NNN 2000ft to 80000ft Altitude accuracy SeT leve A I PE A 5ft e Rp NE NN 7ft A en ner ete eer erate tren tree eer Tere 25ft Static A A A on soie 1355 to 35 mbar abs AECI V RE RE Ea 0 012 reading A A ERE nee 0 008 FS Airspeed ranges A ERE RES m 0 to 500 knots II LIS Tg ett E 0 to 850 knots VNR 0 to 1000 knots Airspeed accuracy E 0 5 knots SOO KNOTS sr 0 07 knots Qc eLAKO E EE E EE anu 35 to 2700 mbar abs le elle Le 0 015 reading EE 0 007 ES Special ele 35 to 3500 mbar abs lge e 0 015 reading T EU MERE oT CY 0 00796 FS Mach number MU 0 to 1 00 MI 0 to 6 00 EE Better than 0 005 Rate of climb Generated ranges Esc c EU EIU ME E 0 to 6000 ft min military ea 0 to 15000 ft min TN 1 of value Dimensions ADIS 405 re t eee EE 485 mm x 270 mm x 3505 mm Weight NINE ee RR RR ee 12 kg ADTS RE 442 mm x 755 mm x 332 mm2. Figure 6 1 ADTS 405F Electronics Rack Page 6 3 K171 Issue No 1 Druck ADTS 405 Service Manual Se O HIN MD Em ZN S4 e CESR Cor iS a SO j PLA AO gt ND B 0 il pave y Y l Je DN J FO H E lt N CA d A L gt VEN y JE y y D A N 27 W Figure 6 2 ADTS 405F Pump Rock Page 6 4 K171 Issue No 1 Druck ADTS 405 Service Manual 5 Parts List Ref ADTS 405F Air Data Test System includes accessories ADTS 405F Air Data Test System ADTS 405 Electronics Rack Controller manifold Assembly 2 6 bar Pitot range Controller PCB Ps matched with item 4 3 Controller PCB Pt matched with item 4 3 Manifold assembly Controller manifold Assembly 3 5 bar Pitot range Controller PCB Ps matched with item 4 3A Controller PCB Pt matched with item 4 3A Manifold assembly Computer PCB DTS405 1729 66 Power Supply Unit AC DTS405 1729 71 Power Supply Unit AC DC option C DTS405 1729 72 alternative to item 6 IEEE 488 Interface PCB option E DTS405 1729 69 DCH Altimeter Encoder Interface special order DTS405 1729 89 DCH ARINC 429 Interface special order DTS405 1729 88 Panel Mimic DTS405 1729 70 DCH Display and Key pad part of option B DTS405 1729 80 Panel Display and Key pad part of option B DTS405 1729 79 kk xk xx
3. 2 Ampere Absolute Alternating current Altitude Calibrated airspeed Direct current For example End of conversion Engine pressure ratio Electrically programmable read only memory And so on Figure Foot Gauge Mercury Hertz Indicated airspeed That is Institute of Electrical and Electronic Engineers standard 488 data Inch Kilogram Light emitting diode Magnesium alloy Metre Milliampere Maximum Millibar Minute or minimum Millimetre Millivolts Number Newton metre Paragraph Static pressure Pounds per square inch Total pressure Differential pressure Ps Pt Local atmospheric pressure Barometric pressure at sea level Rate of climb Standard commands for programmable instruments True airspeed Test equipment Volts Calibrated velocity True velocity Positive Negative Degrees Celsius K171 Issue No 1 Page v Druck ADTS 405 Service Manual K171 Issue No 1 Page vi Druck ADTS 405 Service Manual Chapter 1 Description CONTENTS Para MN 1 SPECIFICATION DESCRIPTION ADTS 405 and Electronics Rack ADTS 405F 5 Pitot dnd static ola 11 Oda 14 Pressure OUTPUT Lunestad 19 MSN eege 21 Control computer and communications 22 ARINC 429 Interface Special order 23 Altimeter Encoder Interface special order 24 IEEE 488 Interface option E 25 PUMO ARR EN EE S e 26 pego EEN ech
4. Adjust To bring to a more satisfactory state to manipulate controls levers linkages etc to return equipment from an out of tolerance condition to an in tolerance condition Align To bring into line to line up to bring into precise adjustment correct relative position or coincidence Assemble To fit and secure together the several parts of to make or form by combining parts Calibrate To determine accuracy deviation or variation by special measurement or by comparison with a standard Check Make a comparison of a measure of time pressure temperature resistance dimension or other quality with a known figure for that measurement Disconnect To detach the connection between to separate keyed or matched equipment parts Dismantle To take apart to the level of the next smaller unit or down to all removable parts Ensure To confirm that a proper condition exists to find out with certainty Examine To perform a critical visual observation or check for specific conditions to test the condition of Fit Correctly attach one item to another Inspect Review the work carried out by Specialists to ensure it has been performed satisfactorily Install To perform operations necessary to properly fit an equipment unit into the next larger assembly or system Maintain To hold or keep in any particular state or condition especially in a state of efficiency or validity Operate Ensure that an item or system
5. Pump Front Panel Figure 2 5 47 Unscrew and remove the four countersunk screws securing pump front panel to pump chassis 48 While retaining the front panel and pump chassis together carefully lay pump unit on its side 49 The front panel can now be carefully pulled slightly away from the chassis to give better access to other components Pump and Motor Assembly Figure 2 5 50 Disconnect the pressure pipe between the bowl filter on the pump assembly and the rear of the rack 51 Disconnect the vacuum line between the pump assembly and the unit rack by removing the swivel right angle fitting from the pump assembly collect the bonded seal 52 Make note of the orientation of the three pipes from pump assembly to pump front panel Remove the three pipes by sliding the red locking rings on the pressure connectors towards the front panel and then pulling the pipes out 53 Disconnect the two electrical connectors from the motor 54 Remove sealant from the four nuts securing pump and motor assembly to the mounting pillars then remove the nuts and washers 55 Carefully remove the pump and motor assembly from front panel K0171 Issue No 1 Page 2 8 Druck ADTS 405 Service Manual Fan 56 Pull back the outer sleeving as necessary to gain access to the cables Cut and remove any tyraps securing the cable loom Disconnect the red and black cables at the terminal block under the front panel 57 From the top of the pump fro
6. ADTS 405 as the pressure source or by using the pressure standard as the pressure source The recommended method is to use the ADTS 405 as the pressure source as this is the normal mode of operation of the ADTS 405 Three different calibration functions are provided Calibration Check 4 This is used to verify accuracy of the calibration without adjusting it Rate Calibration 5 This is used to adjust the control transducers to the main transducer to ensure accurate rate control Rate calibration does not affect ADTS 405 pressure measurement accuracy Main Calibration 6 This is used at depot level and should be carried out by qualified personnel Purging 7 If contamination by water vapour is suspect use the calibration check facility to purge and leak check the ADTS 405 and calibration standard as follows 1 Enter the calibration check facility and select the required calibration mode 2 Apply a vacuum from the calibration pressure source Maintain for five minutes 3 Return the pressure to approximately atmospheric pressure using the calibration media dry air Do not vent to atmosphere Repeat twice more 4 Apply a suitable pressure allow to stabilize and leak test the ADTS 405 and calibration system K171 Issue No 1 Page 5 2 Druck ADTS 405 Service Manual Rate Calibration 8 Rate calibration should only be performed if the rate accuracy is suspect The accuracy of measure or controlled pressures are not affected
7. bowl filter 52 Carefully place pump rack in the case apply Dow Corning Silastic 732RTV sealant to the securing screws Secure the rack in the case Electronics Rack 53 Connect the output pipes and cables to the rear panel of the electronics rack 54 Carefully place the electronics rack into the case apply Dow Corning Silastic 732RTV sealant to the securing screws Secure the rack in the case K0171 Issue No 1 Page 3 6 Druck ADTS 405 Service Manual Chapter 4 Testing CONTENTS Para STANDARD SERVICEABILITY TEST A de EE 1 Procedure rennes 2 FUNCTIONAL TEST IntroducHon nn rennes 8 Procedure nee 10 IEEE 488 Interface test 19 IEEE 488 test Program 20 K171 Issue No 1 Page 4 1 Druck ADTS 405 Service Manual STANDARD SERVICEABILITY TEST General 1 The following procedure can be used to check the functions and facilities of the ADTS 405 When one of the keys on the hand terminal or local key pad is referred to the term PRESS is used e g Press ALT When a menu item on the display is referred to the term SELECT is used In the text the menu item is enclosed in square brackets e g Select MORE Menu items are selected using the appropriate function or soft keys F1 F2 F5 and F4 The menu items may be shown either over the function keys or as a list on the display Procedure Connection and power on checks 2 1 Connect power to the unit connect the hand terminal Ensure that the blank
8. each system function An electroluminescent panel provides back lighting for a twenty character by four line liquid crystal display An internal microprocessor controls the display All key functions are held in EPROM an audio tone sounds to confirm a valid key press The hand terminal connects to the ADTS 405 through the front panel connector extension cables allow the hand terminal to be used on most flight decks K171 Issue No 1 Page 1 15 Druck ADTS 405 Service Manual K171 Issue No 1 Page 1 16 Druck ADTS 405 Service Manual Chapter 2 Dismantling CONTENTS computer PE lt lili FEE 488 EE PCB ra ob Altimeter Encoder Interface DCH ARINC 429 ME OG A FP 4 Glen e EE Power Supply E Pump Rack ADTS AOS a A PUMP Front PANE RE Pump ana Motor Assembly uccisi nt aee Et eege PSU Motor Controller Assembly Illustrations IEEE 458 Interface POB tods Ke gl Al 5 EE EEE ETE Output 1 EE Power Supply Unit Installation a PUB RACK DENE 2 K0171 Issue No 1 Page 2 1 Druck ADTS 405 Service Manual DISMANTLING WARNING VOLTAGES IN EXCESS OF 30 VOLTS RMS AC OR 50 VOLTS DC IN CERTAIN CIRCUMSTANCES CAN BE LETHAL CARE MUST BE TAKEN WHEN WORKING ON LIVE EXPOSED CONDUCTORS General 1 Absolute cleanliness of the work area tools and equipment must be observed Expendable items must be discarded ADTS 405 and Electronics Rack 2 Remove the case lid of the ADTS 405F Disconnect and remove all the electri
9. functions correctly as far as possible without the use of test equipment or reference to measurement Readjust To adjust again to move back to a specified condition to bring backto an in tolerance condition Reconnect To rejoin or refasten that which has been separated Refit Fit an item which has previously been removed K171 Issue No 1 Page iii Druck ADTS 405 Service Manual Terminology continued Remove To perform operations necessary to take an equipment unit out of the next larger assembly or system To take off or eliminate To take or Move away Repair To restore damaged worn out or malfunctioning equipment to a serviceable usable or operable condition Replace Remove an item and fit a new or a serviced item Reset To put back into a desired position adjustment or condition Service To perform such operations as cleaning lubricating and replenishing to prepare for use Test Ascertain by using the appropriate test equipment that a component or system functions correctly K171 Issue No 1 Page iv Druck ADTS 405 Service Manual Abbreviations The following abbreviations are used in this manual the abbreviations are the same in the singular and plural A abs a c ALT CAS d c e g EO EPR EPROM etc Fig ft g Hg Hz IAS i e IEEE 488 in kg LED M m mA max mbar min mm mV No N m Para Ps psi Pt Qc QFE QNH ROC SCPI TAS TE VC Vt ve ve
10. nn M EE 29 kg Temperature OBe GUN0 REE P 10 to 50 C Go ape A nen 5 to 35 C SLO 0 on 40 to 70 C Note The rates ranges and limits may be different depending on customer requirements K171 Issue No 1 Page 1 4 Druck ADTS 405 Service Manual BD ADT5405 AIR DATA TEST SYSTEM mbar Kei mbar mu AA 1 REMOVE Ten PANEL FOR PRINTER COnMECTOR HEE 40h CONNECT TERMINAL keen u HANDBOOK A Ee D Pt controller Ps controller Manifold internal comms Hand terminal LULU 1 4 IEEE 488 Altimeter een PCB Encoder Interface PCB Key pad and display PCB Supervisor computer PCB 5A anti surge HBC 250V 5A anti surge HBC 250V Printer connector IEEE connector Altimeter ARINC connector Power encoder supply connector KEY PAD AND DISPLAY PANEL Figure 1 3 ADTS 405 K171 Issue No 1 Page 1 5 Druck ADTS 405 Service Manual Pump Rack Electronics Rack anti surge HBC 250V Figure 1 4 ADTS 405F Racks K171 Issue No 1 Page 1 6 Druck ADTS 405 Service Manual Description ADTS 405 and Electronics rack ADTS 405F 5 The unit contains the pitot and static manifolds together with all appropriate solenoid valves pressure transducers and pneumatic output connectors
11. on the display with the corresponding measured parameter from the ADTS 405 The labels used for transmitting and receiving each parameter conform to the standard ARINC 429 labels The interface is contained on an option PCB and locates and connects into the motherboard An external connector provides for one transmit and one receive channel A connector fitted to the front panel provides connection to the aircraft ARINC 429 data bus Altimeter Encoder Interface special order 24 The altimeter encoder interface receives the 10 bit digital code from the altimeter enabling the ADTS 405 to display the decoded altitude value and the applied aeronautical value A connector fitted to the front panel provides connection to the altimeter encoding circuit IEEE 488 Interface option E 25 The IEEE 488 Interface option provides a parallel communications system compatible with either 1975 systems option E 1 or SCPI protocol option E 2 Amphenol connectors fitted to the front and rear panels provide connection to a suitable computer K171 Issue No 1 Page 1 13 Druck ADTS 405 Service Manual Pump Rack 26 The rack pump consists of an electric motor driving a pump and controlled by a controller PCB The rack is cooled by an electric fan A power supply unit produces electrical power for the motor circuit fan and circuits to the electronics rack The electrical supply connector power switch elapsed time indicator fuses and auxiliary pneumatic
12. pressure in the manifold is measured by the control transducer which is a silicon strain gauge pressure transducer giving a voltage output proportional to the pressure applied This voltage is amplified by the signal conditioning circuits given further gain depending on the mode of operation by the gain switching circuits and then subtracted from the inner loop set point and amplified in the error amplifier The resulting error signal is frequency compensated to keep the inner control loop stable then applied to a pulse generator circuit that produces a pulse width modulated output through a power driver circuit to both the vacuum and pressure solenoids Outer loop 16 As the pressure changes in the manifold the pressure approaches the set point the outer loop starts operating The pressure in the manifold is first measured by the main transducer This is a vibrating cylinder pressure transducer producing a high stability high accuracy frequency square wave proportional to pressure and an analogue voltage proportional to temperature 17 The pressure signal feeds a 24 bit period counter which counts a 20 MHz reference oscillator for a number of cycles of the incoming square wave representing pressure This enables the incoming square wave to be measured to a very high resolution by the microcomputer The microcomputer software uses the pressure and temperature data to calculate the exact pressure being applied to the main transducer Further corr
13. the earth bonding wire through the p clips Connect the earth bonding wire to the stud on the front panel 21 Secure the PSU cover to the side panel of the rack with the eight screws and shakeproof washers 22 Carefully locate the Pt controller PCB on the studs of the side panel Secure the Pt controller PCB with the four spacers and nuts 23 Secure the PSU cover to the rear panel of the rack with the four screws and shakeproof washers 24 Connect the nine pin connector to the PSU cover Manifold Assembly Figure 3 1 25 Locate the manifold on the front panel and secure with the two screws 26 Position the connectors through the slots in the side panels 27 Carefully insert the output fittings through the front panel into the manifold rotating slightly to ease fitment Secure each fitting with two screws Refit the p clips securing the cable looms to the manifold assembly 28 Connect the two input pipes one to the front panel Ps connector and the other to the pressure regulator Connect the cables to the solenoid valves refer to table 3 1 Note For solenoids with a moulded connection refit the solenoid over the valve and screw on the washer and knurled securing nut Mimic panel 29 Locate the mimic panel on the front panel and secure with the seven nyloc nuts and plain washers 30 Connect the ribbon cable to the mimic panel K0171 Issue No 1 Page 3 4 Druck ADTS 405 Service Manual Display and key pad pan
14. the two screws and plain washers securing PCB bracket to rear panel Carefully remove the PCB K0171 Issue No 1 Page 2 2 Druck ADTS 405 Service Manual retaining wing nut Y PCB retaining bar wing nut spigot IEEE 488 Interface PCB securing screws Figure 2 1 Location of the Interface PCB K0171 Issue No 1 Page 2 3 Druck ADTS 405 Service Manual IEEE 488 interface connector panel Manifold assembly Front panel key pad and display Front panel Mimic panel humidity sensor Figure 2 2 Front Panel K0171 Issue No 1 Page 2 4 Druck ADTS 405 Service Manual Altimeter Encoder Interface PCB Figure 2 1 13 The altimeter encoder interface PCB locates on a connector in the motherboard Release the two clips and disconnect the ribbon connector on the top edge of the PCB 14 Unscrew and remove the two screws and plain washers securing PCB bracket to rear panel Carefully remove the PCB ARINC 429 Interface PCB Figure 2 1 15 The ARINC 429 interface PCB locates on a connector in the motherboard Release the two clips and disconnect the ribbon connector on the top edge of the PCB 16 Unscrew and remove the two screws and plain washers securing PCB bracket to rear panel Carefully remove the PCB Front Panel Figure 2 2 17 To gain access to other components lower the front panel as follows Note This procedure does no
15. 05 1729 81 Kit Filter Rack rear AN4 AN6 DTS405 1729 82 K171 Issue No 1 Page 6 8 Druck ADTS 405 Service Manual List of Accessories Ref Accessory Bag DTS405F 1728 39 MO Terminal Hand see item 3 2 DTS405F 1728 40 MO Cable Assembly 2 5M 6 5ft option A DTS405F 1728 41 MO standard for flight line units Cable Assembly 15M 50ft option A DTS405F 1533 11 MO Cable Assembly 18M 59ft option A DTS405F 1728 42 MO Cable Assembly 30M 100ft option A DTS405F 1533 12 MO Cable Assembly 46M 150ft option A DTS405F 1533 13 MO Cable Assembly Power 5M 16ft DTS405F 1728 43 MO Kit Service DTS405F 1728 44 MO Hose Assembly Static 2 5M 8ft DTS405F 1728 50 MO Hose Assembly Pitot 2 5M 8ft DTS405F 1728 51 MO Kit Hose Adaptor DTS405 1729 52 MO Kit Filter Pump internal DTS405 1729 83 MO Kit Filter Pump panel DTS405 1729 84 MO K171 Issue No 1 Page 6 9 Druck ADTS 405 Service Manual 6 Index of Part Numbers Part Number Figure and item Part Number Figure and item number number ADTS405F 1533 11 MO 4 4 ADTS405 1729 71 MO F ADTS405F 1533 12 MO 4 6 ADTS405 1729 72 MO 1 6A ADTS405F 1533 13 M0 4 7 3 5A ADTS405F 1728 39 MO 4 1 ADTS405 1729 78 MO 3 12 ADTS405F 1728 40 MO 3 2 ADTS405 1729 79 MO 1 12 S 3 11 4 2 ADTS405F 1728 41 MO 4 3 ADTS405 1729 80 MO 2 ADTS405F 1728 42 MO 4 5 A
16. Also located in this rack are the controller PCB for each channel computer PCB IEEE 488 PCB key pad and display PCB ARINC 429 PCB and a power supply unit IEEE 488 Control PCB computer PCB Manifold printer connection IEEE 488 connection Vacuum input Humidity connection sensor Pressure cable regulator Pressure input connection Controller PCB Ps Figure 1 5 ADTS 405 and Electronics rack Internal view K171 Issue No 1 Page 1 7 Druck ADTS 405 Service Manual Power supply 6 The power supply unit is located in the electronics rack enclosed in a metal casing Output from the PSU supplies the rack with a nominal 5V and 15V and a semi regulated 24V supply regulated with respect to 5V supply The circuit automatically resets after an interruption caused by a power failure Solenoid valves 7 All solenoid valves are of a similar type spring loaded to the de energised condition When energised the plunger moves against spring pressure to operate the valve The principal valves are the apply and release solenoids these operate alternately to connect the manifold either to the pressure or the vacuum connection from the pump generating and then holding the required pressure in the manifold The relative opening times of the two valves are determined by the error signal in the controller PCB thereby ensuring that the pressure in each manifold reaches an equilibrium at the pressures appropr
17. Connect the pressure standard to the Ps output on the front panel Fit the blank on the Pt output Pt channel absolute 15 This enables a check of the Pt channel using an absolute pressure standard 1 Connect the pressure standard to the Pt output on the front panel Fit the blank on the Ps output Combined Ps and Pt channel absolute 16 This enables a combined check of the Ps and Pt channels minimising calibration time and the errors due to pressure standard non repeatability 1 Connect the calibration standard to the Pt output on the front panel Fit the blank on the Ps output 2 Apply the pressures in ascending order starting from the lowest pressure Each value will be used as a check point for both Ps and Pt until Ps END is selected At this point the Ps check is complete a valve closes to protect the Ps channel and the remaining points only used for the Pt channel K171 Issue No 1 Page 5 3 Druck ADTS 405 Service Manual Procedure 17 The calibration check should be carried out with the ADTS 405 in the normal operating mode The following equipment is required Note Equivalent substitutes can be used Pressure standard accuracy 0 01 FS absolute and gauge IBM PC with IEEE 488 interface 1 Connect the pressure standard 2 Switch on the ADTS 405 and wait for the start up sequence to take place 3 After a successful start up sequence enter the calibration mode by simultaneously pressing key
18. DTS405 1729 81 MO 3 13 ADTS405F 1728 43 MO 4 8 ADTS405 1729 82 MO 3 14 ADTS405F 1728 44 MO 4 9 ADTS405 1728 83 MO 4 13 ADTS405F 1728 50 MO 4 10 ADTS405 1728 84 MO 4 14 ADTS405F 1728 51 MO 4 11 ADTS405 1729 88 MO 1 9 ADTS405 1728 62 MO Sa 3 8 ADTS405 1728 73 M1 2 3 1A ADTS405 1729 89 M0 e ADTS405 1728 74 M1 2 3 2A ADTS405 1728 77 MO 4 4 ADTS405F 1728 85 MO 2 5 ADTS405 1729 29 MO 4 12 ADTS405 1729 63 MO 1 4A ADTS405 1729 64 MO 1 4 ADTS405 1729 65 MO 3 3 ADTS405 1729 66 M0 15 3 4 ADTS405 1729 69 MO 1 3 3 6 ADTS405 1729 70 M0 1 10 3 9 K171 Issue No 1 Page 6 10
19. Illustrations fig ADTS 405 General view nn 1 1 ADTS 405F General View oia 1 2 ADTS AOS vr 1 3 ADS AOS PE ROCKO rar 1 4 ADTS 405 and Electronics Rack Internal view 1 5 Controller PCB STENE aas opo san 1 6 Ps M anifeld Schematie_ cn lion 1 7 PPE MPR MITEL e E 1 8 Supervisor Computer and Communications 1 9 EI e e 1 10 Hand ea 1 11 K171 Issue No 1 Page 1 1 Druck ADTS 405 Service Manual INTRODUCTION 1 There are two versions of the ADTS 405 a 19 6U high 10 rack mounted unit and a flight line unit The ADTS 405 is a rack mounted system and with external pressure and vacuum supplies connected provides measurement and control for sense and leak testing and functional tests of air data instruments components and systems The ADTS 405F is a self contained air data test system providing complete pressure and vacuum measuring and control for on aircraft sense and leak testing and functional tests of air data instruments components and systems The unit comprises an electronics rack and pump rack enclosed in a high density polyethylene case 2 The user interface for the rack mounted version is a front panel keyboard and display with a hand terminal as an option For the ADTS 405F version the hand terminal is the supplied user interface with the front panel keypad and display as an option The ADTS 405 can also be controlled by a computer PC using the front or rear panel IEEE 488 comm
20. K171 Issue No 1 Page 6 5 Druck ADTS 405 Service Manual 5 Parts List contd Ref Pump Rack ADTS405F 1728 62 MO Pump motor Assembly ADTS405F 1728 85 MO PSU Motor Controller Assembly Mod 00 Superseded by items 3 1A an 3 2A PSU Pump Universal AC DTS405F 1728 73 Mod 01 Supersedes item 3 Controller Brushless Motor DTS405F 1728 74 Mod 01 Supersedes item 3 Fan DTS405F 1728 77 K171 Issue No 1 Page 6 6 Druck ADTS 405 Service Manual Figure 6 3 ADTS 405 Page 6 7 K171 Issue No 1 Druck ADTS 405 Service Manual Ref ADTS 405 Air Data Test System Terminal Hand option A ADTS405 1728 40 MO Controller manifold Assembly ADTS405 1729 65 MO Controller PCB Ps matched with item 3 3 Controller PCB Pt matched with item 3 3 Manifold assembly Computer PCB DTS405 1729 66 Power Supply Unit AC DTS405 1729 71 Power Supply Unit AC DC option C DTS405 1729 72 alternative to item 5 PCB IEEE 488 Interface option E DTS405 1729 69 DCH Altimeter Encoder Interface special order DTS405 1729 89 DCH ARINC 429 Interface special order DTS 405 1729 88 MO Mimic Panel DTS405 1729 70 DCH Display and Key pad ADTS405 1729 80 matched with item 11 Panel Display and Key pad TS405 1729 79 matched with item 10 PCB Motherboard ADTS405 1729 78 Kit Filter Front Panel DTS4
21. Sensing amp Inspection Technologies Druck ADTS 405 405F Air Data Test Systems Service Manual K0171 BES O 2008 General Electric Company All rights reserved Druck ADTS 405 Service Manual TABLE OF CONTENTS Preliminary pages Table of contents this table Introduction Purpose Scope Glossary Abbreviations Chapter 1 DESCRIPTION 2 DISMANTLING 3 ASSEMBLING 4 TESTING 5 CALIBRATION 6 ILLUSTRATED PARTS LIST K171 Issue No 1 Page i Druck ADTS 405 Service Manual INTRODUCTION Purpose This technical manual provides servicing instructions and a parts list to an intermediate level of maintenance for the Druck ADTS 405 series of air data test systems Scope This technical manual contains a constructional description a functional description explaining the theory of operation dismantling assembling and testing procedures The test equipment and special tools required for the recommended maintenance level are listed Associated Druck Documents K114 ADTS 405 User Manual K171 Issue No 1 Page ii Druck ADTS 405 Service Manual GLOSSARY Terminology The terminology used in this manual is specific and individual interpretation must not be introduced The terms are defined as follows
22. age from the transducer A difference error is used to generate the pulse width modulated drive voltages for the apply and release solenoid valves which determine the pressure in the manifolds Both controllers operate in a similar way with additional configuration held in EEPROM 12 The controllers receive pressure and pressure rate commands over the internal communications ring and convert them into controlled pressure and pressure rates at the output using the rough vacuum and pressure supplied by the pump unit They accurately measure the pressure and pressure rate at the output and transmit it over the communications ring the control computer 13 Other commands can be used to open and close auxiliary solenoid valves switch the controller on and off measure mode hold the changing control pressure and oscillate around the set point Any errors detected during internal self test and during normal operations will be coded and transmitted on the internal communications ring Operation 14 Ifthe controller is on a pressure and pressure rate demand received is processed by the microcomputer and output via the set point generator digital to analogue convertor as an analogue voltage which forms the inner loop set point The inner loop is a high bandwidth analogue closed loop pressure control system The inner loop maintains a pressure in the manifold which at all times closely follows the inner loop set point Inner loop 15 The
23. by a rate calibration 9 Select RATE CAL rate calibration takes less than two minutes Note For the rate calibration to be performed pressure and vacuum supplies need to be connected and the Ps and Pt outlets blanked Calibration Check 10 The procedure for calibration check compares the entered aim values and the actual values With a dual channel check the Ps END must be selected to close a valve to protect Ps sensor Pressures must be applied in ascending order Note Pt channel is checked in absolute mode with Auto Zero automatically disabled 11 Differential Qc or airspeed accuracy may be checked in normal user mode For optimum differential accuracy during these tests auto zero should be ON This is particularly significant for very low airspeed work Pressure source 12 Select the pressure source to be used during the calibration Internal 1 This is the recommended method of calibration using the pressure controllers within the ADTS 405 to generate the required pressures for calibration The AIM value and RATE of change of pressure can be entered as required To use this mode vacuum and dry air must be connected External 2 In this mode the ADTS 405 is in measure mode This should only be used when the pressure standard generates the pressure Channel selection 13 Select the channel for checking Ps channel absolute 14 This enables a check of the Ps channel using an absolute pressure standard 1
24. cal and pneumatic connections 3 Unscrew and remove the four screws and cup washers securing the rack in case ofthe ADTS 405F 4 Carefully position the rack on the side of the ADTS 405F case Disconnect all pneumatic and electrical connections from rear of the rack and separate the rack from the case Cover 5 Unscrew and remove the eighteen screws and shakeproof washers securing the cover to the chassis Slide cover off to the rear Controller PCB Note This is part of the Controller Manifold Assembly comprising this component and the manifold as a matched set 6 The controller PCB are located at each side the chassis removal procedures are identical Disconnect the four connectors from the bottom of the PCB 7 Unscrew and remove the four nyloc nuts and collect the four nylon spacers Remove the controller PCB PCB retaining bar Figure 2 1 8 Unscrew and remove the two nylon wing nuts securing PCB retaining bar Release the ribbon cable retaining clip and remove retaining bar Computer PCB 9 The computer PCB locates in a connector on the motherboard A ribbon cable connects on the top edge of the PCB 10 Disconnect the ribbon cable connector on the top edge of the PCB Carefully remove the PCB IEEE 488 Interface PCB Figure 2 1 11 The IEEE 488 interface PCB locates on a connector in the motherboard Release the two clips and disconnect the ribbon connector on the top edge of the PCB 12 Unscrew and remove
25. connections are located on the front panel of the rack 27 The pump is driven by a brushless DC motor Hall effect sensors provide feedback to the motor drive circuits 28 The pump consists of four reciprocating pistons on a central eccentric One piston head is configured for pressure and the other three for vacuum Reed valves in the piston heads control the direction of air flow One of the vacuum heads provides an initial rough vacuum that in turn feeds the other two vacuum heads The output of the pressure head is cooled and then passed through a coalescing filter to extract any condensed water vapour 29 One of the auxiliary pneumatic connectors is supplied by the initial rough vacuum the other two are for external input of vacuum and pressure or can be used as outputs of the pump 30 The power supply unit receives power through a switch and fuse to produce 24 V DC for the motor drive circuits and the power indicator Fan Filter Power supply unit Motor controller PCB Figure 1 10 Pump Rack K171 Issue No 1 Page 1 14 Druck ADTS 405 Service Manual Fi r2 es F4 G STATIC PaA z paso Qc Pt TEAK LOCAL CONTROL TEST PROGRAM Figure 1 11 Hand Terminal Hand terminal Note The hand terminal is a standard component for the ADTS 405F and option B for the ADTS 405 31 The hand terminal has a four key by nine key matrix to allow single key operation for
26. d i compensation generator drivers pressure solenoid I parameter control I Figure 1 6 Controller PCB Schematic Ps Ps Ps Ps vacuum pressure input output MANIFOLD output to main transducer controller PCB pressure temperature power supply from controller PCB vacuum pressure EE E output blank to controller PCB filter gt orifice power supply from controller PCB filter control transducer Figure 1 7 Ps Manifold Schematic K171 Issue No 1 Page 1 10 Druck ADTS 405 Service Manual blank blank blank blank output to main transducer controller PCB pressure temperature power supply rom controller PCB pressure t output output o controller PCB vacuum pressure lt nTWI N ve ref orifice power supply fro m controller PCB control transducer Figure 1 8 Pt Controller PCB Schematic Pressure output 19 The pressure generated in the manifold can be applied to the aircraft system by opening the output solenoid The command to open the output solenoid is received over the internal communication ring A signal is sent to the auxiliary drivers but the output solenoid will only open if the ready line is active Ready line 20 The ready line must be in an active state to enable the auxiliary solenoid driver circuits The ready line is deactivated by an interruption of this line or by a fault detected by the watchdog timer and fail sa
27. ections are made by the microcomputer using the stored zero and span constants from the controller module and the stored constants for the humidity sensor 18 The resulting accurate pressure reading is amplified and frequency compensated by the microcomputer and after subtracting the entered aim point the resulting value is sent to the set point generator DAC to generate the inner loop set point This causes the manifold pressure to change until the pressure measured by the main transducer is exactly the same as the pressure demand sent by the hand terminal K171 Issue No 1 Page 1 9 Druck ADTS 405 Service Manual ready line zero solenoid ready line Watch dog timer Auxilary fail safe circuitry ng output solenoid test point Period counter power bus 8 input A and D convertor configuration EEPROM input from main transducer pressure I Microcomputer test points software EPROM x temperature main transducer power supply power supply to main transducer RS422 serial inteface control transducer parameter power supply power supply to control control transducer set point generator input from DAC control transducer error inner loop amplifier set point signal I to conditioning I microcomputer N I soft start gain switching I controller on off I I eeh r control measure f lt control frequency pulse power vacuum solenoi
28. el 30 Locate the key pad and display on the front panel and secure the display with the four screws and washers 31 Connect the two pin and ribbon cable connectors to the display Front Panel Caution Do not trap any cables between front panel and rear chassis 32 Locate the four screws through the holes in the front panel above and below each handle Secure the front panel to the side panels 33 Invert the partially assembled rack and secure the base plate along the front edge with five screws and shakeproof washers Reposition the partially assembled rack IEEE 488 Interface PCB Note Make sure the PCB connections are correctly aligned on the motherboard 34 Carefully insert the PCB into motherboard and align the holes in the PCB bracket with the rear panel of the rack 35 Secure the PCB with the two screws and plain washers 36 Connect the ribbon cable connector to the top edge of the PCB and secure with the two clips Altimeter Encoder Interface PCB Note Make sure the PCB connections are correctly aligned on the motherboard 37 Carefully insert the PCB into motherboard and align the holes in the PCB bracket with the rear panel of the rack 38 Secure the PCB with the two screws and plain washers 39 Connect the ribbon cable connector to the top edge of the PCB and secure with the two clips ARINC 429 Interface PCB Note Make sure the PCB connections are correctly aligned on the motherboard 40 Carefully inser
29. etween STATE and OFF Program Open channels to the IEEE 488 interface card for control and data Set up interface as Device address 1 Time out 5 secs or greater EOI with last byte out Input terminated by EOI Send Interface Clear Send string1 to device 1 Send string to device 1 Instruct device 1 to TALK and input the response string IF device time out THEN Display FAILED TIME OUT STOP ENDIF IF response string OFF THEN Display PASSED ELSE Display FAILED ENDIF End of IEEE 488 test program K171 Issue No 1 Page 4 7 Druck ADTS 405 Service Manual K171 Issue No 1 Page 4 8 Druck ADTS 405 Service Manual Chapter 5 Calibration CONTENTS Para General 1 Ria 2 Rate calibration rennes 8 Calibration Cheek ii ias 10 POC daa 17 COMP 18 K171 Issue No 1 Page 5 1 Druck ADTS 405 Service Manual CALIBRATION General 1 For optimum calibration accuracy the ADTS 405 should be connected to the pressure standard using metal PTFE or high density polyethylene hoses to avoid contamination of the internal sensors This is particularly important when using an EXTERNAL pressure source 2 Allow one hour for the ADTS 405 to thermally stobilize after power on and before performing any calibration routines 3 The ADTS 405 incorporates an automated calibration facility that can be controlled through the hand terminal or the IEEE 488 SCPI interface The calibration can be performed with the
30. fe circuitry Under fault conditions the output valve instantly closes isolating the output from the aircraft systems Soft start Fig 1 7 21 This provides an almost instantaneous transition from measure mode to control mode When the controller is off the switch is in the measure position connecting amplifier A across the input and output of the frequency compensation circuit The output of the frequency compensation circuit is forced to zero ensuring that no pulses will be applied to the pressure and vacuum valves when the controller is switched on When the controller is selected on the set point generator is adjusted until the voltage at the output of the error amplifier is the same as the voltage applied to the frequency compensation circuit by amplifier A With equal voltage applied the switch changes from measure to control disconnecting amplifier A and amplifier B initiates the soft start signal to microcomputer which switches on the controller The value of the set point is sent back to the microcomputer where it is converted to current units of display and used as the current aim value It takes less than 2 seconds for the controller to come on line K171 Issue No 1 Page 1 11 Druck ADTS 405 Service Manual Supervisor Computer and Communications 22 The supervisor computer consists of the computer PCB located on a motherboard The computer PCB is a self contained microcomputer based on the 68000 microprocessor The software i
31. he hand terminal Ensure that the blanking caps are fitted to the Ps and Pt front panel outputs 2 Switch the unit on using main power switch Switch the pumps on using pump power switch 3 Check power indicator is ON Check the display shows the power up message as below where x is the issue number of the installed software version number DK 126 Version x xx Display Power Up Please Wait 4 Check the power up message displays as below where x is the issue number of the installed software version number DRUCK ADTS 405F DK 127 VER x xx 11 The ADTS 405 will display any errors that are detected Check that the power up sequence continues through the following stages without error Self Test Measuring Ground Pressures Equalizing System Pressures 12 Check that the display then changes to show measured altitude and airspeed CAS values Note 1 The display shows the WARM UP message in the lower right corner This signifies that full pressure accuracy may not be achieved The WARM UP message clears after approximately 15 minutes The WARM UP indication does not inhibit operation and these tests may proceed without waiting for the flag to clear Note 2 An automatic zero takes place if enabled on a regular basis The word ZERO appears on the display and the state of the valves on the mimic panel changes for approximately six seconds This is normal operation Commands ma
32. iate to the altitude speed rate of climb or engine intake condition demanded at the hand terminal The valves also equalise air pressure to give a zero reading during a self test routine when the test system is isolated from the aircraft air data systems Both channels have protection valves controlled by the microcomputer when energised the valves close isolating the test system from the aircraft system 8 The humidity sensors measure the humidity of the air for each manifold producing a voltage signal proportional to the humidity The voltage is amplified and corrected using stored calibration data held in each controller circuit The resulting voltage is used to correct the signal from the vibrating cylinder pressure transducer 9 The pressure input line is fitted with a filter and o 9 bor pressure regulator before it feeds the monifold assembly The vacuum input line also hos q filter 10 The principal components of the manifold assembly are two pneumatic manifolds one for pitot connection one for static together with their associated solenoids pressure sensing transducers These components are mounted on the inside of the rack and ore not accessible when the rack is instolled K171 Issue No 1 Page 1 8 Druck ADTS 405 Service Manual Pitot and Static Controllers 11 The controller PCB is a self contained pressure measurement control system which takes the analogue set point from the data converter and compares it with the volt
33. ing caps are fitted to the Ps and Pt front panel outputs 2 Switch the unit on using main power switch Switch the pumps on using pump power switch 3 Check power indicator is ON Check the display shows the power up message as below where x is the issue number of the installed software version number DK 126 Version x xx Display Power Up Please Wait 4 Check the power up message displays as below where x is the issue number of the installed software version number DRUCK ADTS 405F DK 127 VER x xx 3 The ADTS 405 will display any errors that are detected Check that the power up sequence continues through the following stages without error Self Test Measuring Ground Pressures Equalizing System Pressures 4 Check that the display then changes to show measured altitude and airspeed CAS values Note 1 The display shows the WARM UP message in the lower right corner This signifies that full pressure accuracy may not be achieved The WARM UP message clears after approximately 15 minutes The WARM UP indication does not inhibit operation and these tests may proceed without waiting for the flag to clear Note 2 An automatic zero takes place if enabled on a regular basis The word ZERO appears on the display and the state of the valves on the mimic panel changes for approximately six seconds This is normal operation Commands may still be entered while auto ze
34. ion 10 Pull the outer sleeving over the cable loom and secure with tyraps Pump and Motor Assembly 11 Before assembling carefully apply Dow Corning Silastic 732RTV sealant to the stiff nuts and anti vibration washers securing pump and motor assembly to pillars 12 Fitananti vibration washer to each mounting pillar and then locate the pump motor assembly with the four anti vibration washers and stiff nuts 13 Connect the two electrical connectors to the motor 14 Connect the three pipes to the connectors under the front panel in their previously noted positions K0171 Issue No 1 Page 3 2 Druck ADTS 405 Service Manual S A DA PIOU8IOS T SANBIY Q o D o Se l lt mi lt mi lt mi lt m m 0 oO a 9 O oe pa 4oe q UMOJq 49819 aBueJo 4981 MOIS Jnojo S A DA piouejos T ejqo1 SUOIND3UUOD Josuas YPILINH suuoo Buunoes di 5 d Page 3 3 K0171 Issue No 1 Druck ADTS 405 Service Manual 15 Locate a new bonded seal to the right angle fitting and connect the vacuum pipe to the pump unit 16 Connect the pressure pipe to the bowl filter Pump Front Panel 17 Carefully align the front panel over the partially assembled pump unit and secure with the four countersunk screws 18 Refer to final assembly para 51 ADTS 405 and Electronics Rack ADTS 405F Power Supply Unit 19 Fitthe PSU board to the motherboard Locate the cover over the PSU board 20 Route
35. nt panel unscrew and remove the four screws stiff nuts and plain washers securing fan cover to fan 58 Unscrew and remove the four hexagonal socket cap screws securing the fan to the front panel this breaks the water seal Remove the fan PSU Motor Controller Assembly 59 Cut and remove any tyraps securing the cable looms attached to the PSU 60 Disconnect the electrical connectors from the PSU and motor controller 61 Unscrew and remove the two screws and plain washers securing the motor controller PCB 62 Unscrew and remove the four screws and shakeproof washers securing PSU 63 Remove the motor controller and PSU K0171 Issue No 1 Page 2 9 Druck ADTS 405 Service Manual c o LE Pump motor assembly Bowl filter connectors q j aN UU LE WI Lee Deg ei Gas lit AN nr LL NA N Y x NE BD A 7 i SD Controller PCB TN D SN De Power input connector Auxiliary pneumatic connectors Power supply unit Figure 2 5 ADTS 405F pump rack details Page 2 10 K0171 Issue No 1 Druck ADTS 405 Service Manual Chapter 3 Assembling CONTENTS Para TEO I 1 Pump Rack ADTS 405 Fh Jemen 2 PSU Motor Controller Assembly 2 FAN pe 5 Pump and Motor Assembly LI Pump FP Le 17 ADTS 405 and Electronics Rack ADTS 405F 19 Power Supply Unit don 19 Manifold Assemb etr abre tH Se 25 Mimic Panel rennes 29 Front Panel
36. r min Check that the displayed valve of Ps and Qc both remain within 0 5 mbar Press Pt to display the measured rate of change of Pt Check that the Pt Rate is less than or equal to 0 5 mbar min Pressure leak check 17 This section verifies that the unit is leak tight under positive pressure conditions 1 2 3 4 5 6 7 Press CONTROL to turn the pressure controllers ON The display shows AIM in place of LEAK MEASURE Enter a Ps aim of 1016 mbar by pressing Ps 1 0 1 6 ENTER Enter a Qc aim of 272 mbar by pressing Qc 2 7 2 ENTER Wait for the aim values to be achieved then wait for 1 min Press LEAK MEASURE to turn the controllers OFF Press RATE TIME and select WAIT 05 00 TIME 01 00 Observe that the WAITING time is shown on the display as it counts down followed by the TIMING time At the end of the TIMING period press RATE to display the measured rate of change of Qc T is shown after the value indicating a timed average Check that the Qc Rate is less than or equal to 0 5 mbar min If the leak rate is not achieved allow further thermal stabilizing time and re test by pressing RATE TIME and selecting WAIT 05 00 TIME 01 00 18 Using key presses based on the above control the Ps and Qc pressures to the normal limits of operation and ensure that these are achieved Use minimum Ps and zero Qc and then maximum Ps and maximum Qc Note Do not exceed the maximum Pt as
37. ration mode il Select go to ground or stay at the current pressure Table 5 1 Table 5 2 Calibration Check Points Ps Calibration Check Points both channels Calibration Pressure GR Ci 1 Table 5 3 Calibration Check Points Special version both channels Ps END Pt value only 103 4 3502 K171 Issue No 1 Page 5 5 Druck ADTS 405 Service Manual K171 Issue No 1 Page 5 6 Druck ADTS 405 Service Manual Chapter 6 Illustrated Parts List CONTENTS Para Introduction ettet TEE DERE tis 1 A eite et ba 5 Index of Part Numbers nier 6 Illustrations fig ADTS 405F Electronics Rock 6 1 DE PPU RACK LL Su eee 6 2 TER 6 3 K171 Issue No 1 Page 6 1 Druck ADTS 405 Service Manual Illustrated Parts List Introduction 1 The purpose of this list is to itemise the parts that comprise the unit It is intended for use in provisioning requisitioning and storing replacement parts 2 In general parts are listed in order of disassembly and are indented to show their relationship to the next higher assembly 3 Numerical indexes are provided to assist in locating part numbers in the Parts List 4 Items that are non procurable are indicated in the QTY column by the letters NP Items that are for reference are indicated by the letters ref Items that are not illustrated have a t symbol next the item ref number K171 Issue No 1 Page 6 2 Druck ADTS 405 Service Manual
38. rennes 30 IEEE 488 Interface DCH 32 Altimeter Encoder Interface DCH 35 ARINC 429 Interface 38 Computer PCB C 41 Controller DCH 46 EVE 48 Final Assembly ADTS ADOBE 49 Pump Rack ias 49 Electronics Bock 51 Illustrations fig Solenoid valves nr 3 1 K0171 Issue No 1 Page 3 1 Druck ADTS 405 Service Manual ASSEMBLING General E Ensure all parts are clean absolute cleanliness of the work area tools and equipment must be observed Pump Unit ADTS 405F PSU Motor Controller Assembly 2 Secure the PSU to the side panel of the pump rack using the four screws and shakeproof washers 3 Secure the motor controller PCB with the two screws and plain washers 4 Connect the input and output connections to the PSU Connect the two cables to the connector block on the controller PCB Fan 5 Before assembling carefully apply Dow Corning Silastic 732RTV sealant to the lower face of the fan and locate the fan on the front panel Note Avoid sealant on the fan blades Ensure the sealant is continuous around periphery of the fan 6 Locate the fan on the front panel of the pump rack and secure with the four hexagonal socket cap screws and washers rA Insert the red and black cables into the outer sleeving and route the cable to the terminal block under the front panel 8 Crimpa terminal connector to each cable 9 Connect each cable to the terminal block Slide the insulating sleeve over each connect
39. ress Ps and wait for the aim values to be achieved 5 If auto zero is enabled wait for an auto zero to take place During auto zero the valve state changes on the mimic panel and the display shows ZERO in place of the airspeed aim value The time to auto zero should be less than 1 minute from achieving the aim value 6 Wait for a minimum of 20 seconds after auto zero before proceeding 7 Observe the measured values of Ps and Qc on the display for 1 min 8 Check that the displayed value of Ps remains within 0 068 mbar 9 Check that the displayed value of Qc remains within 0 068 mbar Note Ifa further auto zero takes place allow the display to stabilise following the auto zero before proceeding K171 Issue No 1 Page 4 5 Druck ADTS 405 Service Manual Vacuum leak check 16 This section verifies that the unit is leak tight under vacuum conditions 1 2 3 4 5 6 Press LEAK MEASURE to turn the controllers off Press RATE TIME and select WAIT 05 00 TIME 01 00 Observe that the WAITING time is shown on the display as it counts down followed by the TIMING time At the end of the TIMING period press ROC to display the measured rate of change of Ps T is shown after the value indicating a timed average Check that the Ps Rate is less than or equal to 0 5 mbar min Press RATE to display the measured rate of change of Qc Check that the Qc Rate is less than or equal to 0 5 mba
40. rily restrain the PCB 37 Disconnect the earth bonding wire from the stud on the front panel Cut and remove the tyrap securing the earth bonding wire and pull through the p clips K0171 Issue No 1 Page 2 6 Druck ADTS 405 Service Manual Controller PCB mounting detail Nylon spacer Nylon spacer Nylocnut A C power connector D C power connector option C Front panel Side panel Pt Controller PCB Figure 2 4 Power Supply Unit Installation 38 Remove the insulating sheet from the studs Unscrew and remove the eight screws and shakeproof washers securing the PSU to the right hand side of rear chassis 39 Unscrew and remove the four screws securing the PSU to the front panel 40 Remove the PSU and cover It may help to carefully lever top cover upwards at a point near the six pin connector K0171 Issue No 1 Page 2 7 Druck ADTS 405 Service Manual Pump Rack ADTS 405F 41 Unscrew and remove the four screws and cup washers securing the electronics rack in the case 42 Carefully position the electronics rack on the side of the case 43 Disconnect all pneumatic and electrical connections from electronics rear of the rack Temporarily place the rack in the case 44 Unscrew and remove the four screws and cup washers securing pump unit in the case 45 Carefully lift out the pump unit and carefully position the pump unit on the case 46 Unscrew the drain pipe from the bowl filter
41. ro takes place K171 Issue No 1 Page 4 2 Druck ADTS 405 Service Manual Key pad Check 5 Press the MACH key and check the display changes to show Altitude and Mach measured values Pump unit 6 Switch on the pump unit 1 Press CONTROL to go to control mode Enter an altitude aim of 5000 ft by pressing 5 0 0 O ENTER 2 Enter an airspeed aim of 500 knots by pressing SPEED 5 0 0 ENTER 3 Check that these aim values are achieved Completion 7 On successful completion of this test procedure switch off the unit and the power supply K171 Issue No 1 Page 4 3 Druck ADTS 405 Service Manual FUNCTIONAL TEST Introduction 8 This test verifies that the ADTS 405 is fully functioning all external interfaces are tested When one of the keys is referred to the term PRESS is used e g Press ALT When a menu item on the display is referred to the term SELECT is used In the text the menu item is enclosed in square brackets e g Select MORE Menu items are selected using the appropriate function or soft keys F1 F2 F5 and F4 The menu items may be shown either over the function keys or as a list on the display Test Equipment 9 The following test equipment is required for this procedure i PC compatible computer with IEEE 488 interface cord and cable ii PC based test program for IEEE 488 communications Procedure 10 Connection and power on checks 1 Connect power to the unit connect t
42. s F1 and F4 The display shows CALIBRATION F1MAIN CALIBRATION F2 CALIBRATION CHECK F3 RATE CALIBRATION Note The main calibration facility is used at depot level by qualified personnel 4 Press F 2 Calibration check 5 Switch on the pump unit 6 Select the pressure source internal 7 Set the channel to be checked Ps Pt Ps and Pt 8 Select the combined channel check Ps and Pt Note For only checking the Ps channel use the values in table 5 2 9 Enterthe first aim value in table 5 1 and record the value on the pressure standard 10 Repeat this for further values in table 5 1 until after point 8 press Ps END CAUTION THE Ps SENSOR WILL BE OVER PRESSURED AND DAMAGED UNLESS PsEND IS SELECTED 11 Enter the remaining values in table 5 1 for the Pt channel and then press Pt END 12 Compare the recorded values and with the applied values the difference must not be greater than 0 012 Ps and 0 015 Pt of the applied values 13 If the difference exceeds these values repeat the procedure If the differences still exceed these values return the unit to depot K171 Issue No 1 Page 5 4 Druck ADTS 405 Service Manual Completion 18 When the calibration check is complete repeatedly use the QUIT key to return to the first calibration screen i If necessary carry out a rate calibration or press QUIT can be pressed again to exit calib
43. s contained in two EPROM located on the computer PCB The computer PCB provides direct communication with the hand terminal and an internal communications ring in the form of RS422 differential drivers and receivers It also provides a direct interface for the Centronics parallel printer output connector on the front panel The motherboard distributes the data address and control bus to the control computer It also contains a ready line interface and EEPROM for storing system configuration information and test program sequences Mimic panel l status indicator calibration solenoid I i red green LED enable status LED I I X X gt 20 ls dad Co stedt A SA Espe AA EEN je by EPROM ag EEPROM d Er decode hand terminal communications link Interface ready line ready line Supervisor data address and LV power computer control bus PCB 68000 internal I communications buffers GE GE ENCODER I IEEE 488 PCB INTERFACE PCB i PCB i U I SE DEE parallel printer IEEE 488 Altimeter encoder ARINC 429 interface interface interface interface Figure 1 9 Supervisor Computer and Communications K171 Issue No 1 Page 1 12 Druck ADTS 405 Service Manual ARINC 429 Interface special order 23 The ARINC 429 interface option enables the transmitting of aeronautical and pressure parameter data to the aircraft system It also monitors ARINC 429 data from the aircraft and shows the data
44. shown on the front panel of the unit Use maximum available rates of change to minimise test times See User Manual K114 for further information on setting limits K171 Issue No 1 Page 4 6 Druck ADTS 405 Service Manual IEEE 488 interface test 19 This section verifies IEEE 488 operation 1 2 3 4 5 6 7 8 IEEE 488 tes Ensure that the IEEE 488 address of the ADTS 405 is set to 1 as follows a Hold down F1 and press SETUP to display the CONFIG menu b Select MORE DISPLAYS OPTIONS OPTIONS IEEE 488 DEVICE ADDRESS Enter an address of 1 by pressing 1 then ENTER C Press QUIT Switch off the unit and pumps Connect the PC with IEEE 488 interface to the IEEE 488 connector under the cover on the front panel Switch on the unit Wait until the display shows altitude and airspeed Run the test program on the PC Check that REMOTE appears in the lower right corner of the display Check that PASSED is displayed on the PC Switch off the unit and disconnect the PC and IEEE 488 cable t program 20 The following test program should be implemented on an IBM PC or compatible computer The test program is shown in pseudo code The exact details of the commands depend on the actual IEEE 488 interface card used and the language used for programming 1 2 Definitions string1 SOURCE STATE OFF one space between STATE and OFF string2 SOURCE STATE one space b
45. t f Figure 2 3 Output fitting 27 Remove the p clips securing the wiring looms to the manifold Disconnect the two input pipes from the front panel and regulator 28 Unscrew and remove the three hexagonal socket cap screws securing the static transducer mounting block to the main manifold Repeat this operation for the Pitot transducer 29 Identify and note the cables to all the solenoids Disconnect the connectors from all solenoids For solenoids with moulded connectors unscrew and remove the knurled securing nut and washer from the coil and remove the coil Caution The manifold is now free to move Extreme caution should be taken in further operations to prevent damage to the manifold or other components 30 Carefully remove the manifold Display and key pad panel 31 Disconnect the ribbon cable connector and two pin connector from the display 32 Unscrew and remove the four screws and washers securing the display to the front panel Remove the display and key pad Power Supply Unit Figure 2 4 33 The PSU is contained in a metal enclosure at the right hand side of the rear chassis To gain access the Pt controller PCB must be removed from the four mounting studs as follows 34 Disconnect the nine pin connector from the PSU enclosure 35 Unscrew and remove the four nuts securing Pt controller PCB to right hand outside end of rear chassis 36 Carefully lower Pt controller PCB to the horizontal position tempora
46. t completely remove the front panel 18 Disconnect the ribbon cable connector from top edge of IEEE 488 interface PCB 19 Invert the rack unscrew and remove the five screws and shake proof washers securing base plate to front panel along front edge of base plate Restore rack to the correct way up 20 Unscrew and remove the four screws securing front panel to rear chassis These are located above and below each handle 21 Carefully lower the front panel until it is in a horizontal position on the bench 22 Start to carefully separate the front panel from the chassis and disconnect the ribbon cable from the mimic panel Mimic Panel 23 Unscrew and remove the seven nyloc nuts and plain washers securing the mimic panel to the front panel Remove the mimic panel Controller Manifold Assembly Figures 2 2 and 2 3 Caution Ensure absolute cleanliness of the work area for the following procedure to prevent ingress of dirt into manifold 24 Tilt the front panel to the vertical position and rest against rear chassis Remove blanking caps from Ps and Pt output fittings 25 Unscrew and remove the two screws from each output fitting and remove fittings rotating slightly to ease removal 26 Unscrew and remove the two screws from under output fittings securing manifold to front panel Lower front panel to horizontal position K0171 Issue No 1 Page 2 5 Druck ADTS 405 Service Manual L NED oy Le ald i i pi s l
47. t the PCB into motherboard and align the holes in the PCB bracket with the rear panel of the rack 41 Secure the PCB with the two screws and plain washers 42 Connect the ribbon cable connector to the top edge of the PCB and secure with the two clips K0171 Issue No 1 Page 3 5 Druck ADTS 405 Service Manual Computer PCB Note Make sure the PCB connections are correctly aligned on the motherboard 43 Carefully insert the PCB into motherboard 44 Connect the ribbon cable connector to the top edge of the PCB PCB Retaining bar 45 Fit the retaining bar on the spigots make sure that the PCB are secured by the bar but not under tension If necessary adjust the nuts on the spigots 46 Secure the ribbon cable in the clip on the retaining bar Caution Do not over tighten the nylon wing nuts the PCB can be damaged 47 Carefully fit the nylon wing nuts Controller PCB 48 Fit the insulating sheet on the studs Locate the controllers PCB on the appropriate side panel and connect the connectors to the controller PCB 49 Secure each controller PCB with four nylon spacers and nyloc nuts Cover 50 Slide the cover over the rear of the assembled rack align the holes and secure the cover with the eighteen screws and shakeproof washers Note This completes the assembly of the ADTS 405 Final Assembly ADTS 405F Pump Rack 51 Place the cables and output pipes of the pump rack through the case Connect the drain pipe to the
48. unications interface The front panel contains the operate switch and the mimic panel with LED indicators showing the operation of the two pneumatic channels 3 The pump rack on the ADTS 405F produces pressure and vacuum supplies for the electronics rack and for external connectors Located on the front panel the external connectors provide for external pressure and vacuum supplies EXT PRESSURE and EXT VACUUM and an auxiliary static vacuum output AUX The auxiliary static output provides vacuum for suction type static adaptors The rack is cooled by a fan located under a protective cover on the front panel The power supply connection for the ADTS 405F is located on the front panel 4 The ADTS 405 can display and operate in either units of pressure measurement or aeronautical units The rate that the pressure changes to a new set point can be set The rate is then reduced as the set point is achieved and maintained without overshoot A ground facility automatically and safely controls both channels to atmospheric pressure at the previously entered rates of change and then informs the user when both channels are safely at ground K171 Issue No 1 Page 1 2 Druck ADTS 405 Service Manual AIR DATA TEST SYSTEM ADTS405 REHNE THR PANEL FOR E Pr PRINTER CONNECTOR ru Era Cri TOR ROC RATE IER TE M BOOK 242 HANDBODK Figure 1 1 General view
49. y still be entered while auto zero takes place K171 Issue No 1 Page 4 4 Druck ADTS 405 Service Manual Key pad Check 13 This verifies the hand terminal key pad operation 1 Press the MACH key and check the display changes to show Altitude and Mach measured values 2 Press each key in turn in the order shown below and check that the hand terminal beeps on each key press Note The display shows a warning message when the EPR key is pressed This message should be ignored Do not press the QUIT key to clear the warning message F1 F2 F5 F4 ALT SPEED MACH EPR ROC RATE TIME HOLD RATE LEAK MEASURE GROUND PORT LOCAL PRINT EXEC TEST PROGRAM HELP SETUP UP ARROW 7 8 9 DOWN ARROW 4 5 6 000 1 2 3 CLEAR 0 ENTER 14 Change the units to mbar as follows 1 Press SETUP then select UNITS Repeatealy select NEXT until the display shows mbar 2 Select SAVE and then press QUIT twice and the display now shows Ps and Pt in units of mbar Controller stability 15 This section verifies the control stability 1 Press CONTROL to turn the pressure controllers ON AIM replaces LEAK MEASURE on the display 2 Enter a Ps aim of 510 mbar with a rate of change of 204 mbar min by pressing the following Ps 5 1 0 ENTER Ps RATE 2 0 4 ENTER 3 Enter a Qc aim of 0 mbar with a rate of change of 204 mbar min by pressing the following Qc 0 ENTER RATE 2 0 4 ENTER 4 P
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