service & repair manual scan 2000 gyrocompass
Contents
1. 14 x 16 7 20 x15 X 17 X 19 pi b 11 1 4 8 36 2 107 9 plo f 0 1 m V D L L 2 Zw L GSB TB CB SFB ASB 6558 HDB ICB 0 SCAN STEERING Page 44 January 2001 SCAN 2000 SERVICE amp REPAIR MANUAL Page 45 CD OS 7 CS gt 2 N CU a P lt M lt T CD C SCAN STEERING SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 Gimbal Ring Bracket 9 V 7 V e VV Ly Pir o hese 2 resistors must be changed together with gyroscope For normalizing gyroscope SCAN STEERING Page 46 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 a EE CO D d I lt lt 2 SCAN STEERING Page 47 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 p x gt 3 m N aDduUueuesey m m e lt N Joy NA CU 2 lt gt gt lt gt k AY 593 e 1 N A lt X M x2. check Value Regularity Check of external appearance monthly Check of insulation resistance min 20 MOhm once a year Gyro settling time check min 1 5 at each run up Gyro bias drift compensation max 0 2 deg once a year The result of the periodic maintenance shall be written down into the record book Procedure of checks 7 3 1 It is allowed to make gyrocompass external appearance inspection with gyrocompass running Gyrocompass units are checked for cleanliness security of attachment condition of cables and reliability of their connection 7 3 2 Insulation resistance check is made in accordance with described in p 6 7 of this Manual SCAN STEERING Page 17 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 7 3 3 Check of the gyro settling time is made in accordance with the procedure described in p 6 8 of this Manual 7 3 4 Compensation of the gyro bias drift is made in normal climatic conditions when the ship is moored to the berth The procedure of compensation is given below 7 3 4 1 Azimuth drift compensation a switch on the gyrocompass in accordance with the procedure described in p 6 8 of this M and define the gyrocompass settling time b when indicator READY on the front panel of the Operator Console lights let gyrocompass operate during 2 hours and after that take the reading of the current heading Ho from the display of the Operator Console c set the switch CG GA on the El
3. 7 A 2 N e N bu lt m N lt N ce c lt lt c e cu m N mg N V Qu ES A lt X g youbig CU m 95555 andang ion 5 Sc gs VU JA N N 6 amp O X ex V m n ES oo puodey 6 o Xo amp Ex joubs 1044005 e s E 4 e t N Co joubs 1943 03 o N Q 6 7 G 4 R ew NG D O Y 8 G D V 5 en o I x CU m m V D e CU m m lt P x CU e m m lt e lt e SCAN STEERING Page 48 Diagram Page Electrical 7 onic Unit ectr 7 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 CO ON gt lt gt lt gt lt gt lt o lt m o e CN o ZH 81 M A CU V N QJ V 8 M 6 e O m SD N OS N e e o N _ S X e n FE 27 m e X e lt oe eoe m Jta ey e a e i i e X e lt N X e d V g 0 a m o J D CU pi m 2 e N X f CU OO v CU m o 2 5 5
4. READY is lit with the help of resistors on the Electronic Unit set zero voltages DC on the jack Wat and wrt with accuracy of 5 mV Adjust gyrocompass in accordance with paragraph 8 3 4 of Service Manual SCAN 461 524 001 N3 Measure ambient temperature at which adjustment was performed Increase ambient temperature or temperature in a heat chamber for 10 3 C hold gyrocompass in this temperature for 6 hours and then perform adjustment in accordance with paragraph 8 3 4 of Service Manual SCAN 461 524 001 N3 considering Wa WAT WR Wit After adjustment check gyrocompass SCAN 2000 in accordance with paragraphs 6 8 and 6 12 of Service Manual SCAN 461 524 001 N3 TESTING OF GYROCOMPASS SCAN 2000 AFTER ACCELEROMETER AND GYROSCOPE REPLACEMENT After repair gyrocompass SCAN 2000 shall be tested in accordance with paragraphs 4 8 9 10 12 of Table 1 from Service Manual SCAN 461 524 001 N3 SCAN STEERING Page 42 January 2001 SCAN 2000 SERVICE amp REPAIR MANUAL 201 6 006 2 AVANI NIXJJLS NVY9 831539 quuny x AS9JoS Quunu 8 yseq eubd 5ununoy ONIINOONW 3 JOH 0 0 7 O Page 43 SCAN STEERING SCAN 2000 SERVICE amp REPAIR MANUAL January 2001
5. oj RS232 RS232 RS422 9 RS422 05 10 Screen 05 s V Cable 4 4x1 0 500 Pin Circuit Pin 80 Remarks aids MM2 24 Cinalns 1 0 2 24V Cinalns 10 24V 10 4 24V SCAN 461524 001 36 AN 2000 SERVICE amp REPAIR MANUAL January 2001 e 12V 400Hz 3 RS232 4 5 Screen 13 sin K 5 14 sin K 8 M Cable 6 10x0 5 500 gt Sectic ie Circuit Pin We 8 Remarks 5 PN ay 1 STEP R EN 2 esTEP 3 35STEP A 2E ka us 4 Uss e4V 05 Q GND e4V _RS232 RS422 RS422 10 Screen 0 5 Cable 7 2x1 0 500 Pin Circ Section A ae PUN Cir cui pin Remarks 24V 1 0 A e 24V 1 0 Cable 8 10 0 Pin rcuit Section PA x16 i Me Remarks 1 10 2 20V 50hz 10 I Page 2 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 REPAIR MANUAL SCAN 461841 001 TP SCAN STEERING Page 31 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 INSTRUCTION CARD NO 1 GENERAL INSTRUCTIONS MAINTENANCE TASK Tools equip ment materials GENERAL REQUIREMENTS Repair Manual shall be complemented by the following technical publications on gyrocompass SCAN 2000 H Operation Manual SCAN 2000 B Service Manual SCAN 461524 001 N3 Main Repair procedur
6. 320 mV The new value of DC voltage U wA on the jack wA that was set by potentiometer turning is U wA UoA Ucom 100 mV 320 mV 220 mV 7 3 4 2 Horizontal drift compensation a after testing on p 7 3 4 and two hour operation of gyrocompass in CG mode the settle point error SPE is determined in accordance with p 6 11 1 6 11 3 b if SPE exceeds 0 2 deg measure the value of the DC voltage Staking the sign into account on the jacks wr and O T common point of the Electronic Unit Use the digital voltmeter for measuring The signal lead of the voltmeter is connected to wr and the common lead to O T c calculate the horizontal drift compensation voltage taking the sign into account by the formula Ucom SPE 0 262 cos 400 mV deg where is the local latitude d turning the potentiometer wr on the Electronic Unit set the value of DC voltage U or on the jack wr equal to U or Uor Ucom taking the sign into account e determine once again the SPE value in accordance with pp 6 11 1 6 11 3 SPE shall not exceed 0 2 degree otherwise the compensation must be repeated SCAN STEERING Page 19 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 Example SPE 0 85 p 60 600 mV Ucom SPE 0 262 cos e0 8 0 262 0 5 400 mV deg 0 42 mV The new value of DC voltage Uywr on the jack wr that was set by turning the potent
7. 001 from main 24V DC supply and SCAN 461524 001 01 from the main switchboard and emergency supply unit battery 4 3 3 The automatic switching from the main to the emergency feeder is made with the help of the Supply Unit PS 220 4 3 4 Each unit of the gyrocompass is delivered with the set of mounting and Spare parts in accordance with the factory certificate SCAN STEERING Page 9 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 5 Preparation for use Before switching on the gyrocompass the following operations shall be done 5 1 Operator Console set SPEED switch to 0 position set LATITUDE switch to 0 position e set the dimmer in medium position 5 2 Electronic Unit e open the cover and set NORMAL selector to TEST position 5 3 Main Unit e set the dimmer into medium position 5 4 Repeaters e set the dimmer into medium position 5 5 Course Recorder all preparatory works are done in accordance with the Instructions Manual for the course recorder SCAN STEERING Page 10 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 6 Operation procedure and Measurement of Parameters 6 1 After installation on board a ship each gyrocompass shall pass mooring and running trials to prove its serviceability in actual conditions 6 2 Trials are carried out in standard climatic conditions in the scope and sequence specified in Table 1 Table 1 No Parameter Requirement or Method SM point SM point
8. 2001 NN MAINTENANCE TASK Tools equip ment materials INSTRUMENT LIGHT REPLACEMENT Unscrew screws 14 with washers 17 to disconnect terminal Screwdriver lugs from instrument light board 2 Unscrew screws 11 and remove defective instrument light Screwdriver 2 from the unit Note Instead of removing instrument light it is allowed to make two jumpers with a wire of 0 3 0 5 mm in diameter passed through conduit on the pins 2 and 3 fig 3 view B and replace terminal lug and screw 11 from the second to the first pin Group of spare lamps is used Mount new instrument light 2 on the casing and secure it Screwdriver with screws 11 and washer 16 Screws are locked with Prime Brush prime Connect terminal lugs to instrument light board 2 in Screwdriver accordance with wire marking and secure with screws 14 Prime Brush with washers 17 Screws are locked with prime Inspect unit appearance for coating deterioration If Brush necessary paint casing with black enamel 2 layers Before Black enamel painting degrease surface with coarse calico cloth Gasoline moistened in gasoline Dry first layer for 1 2 hours second Coarse calico layer for 6 7 hours at temperature 18 25 C Tweezers L 100 150mm Test repaired instrument lamp within Gyrocompass SCAN 2000 in accordance with paragraph 6 of Table 1 from Service Manual SCAN 461 524 001N3 Before testing mount scale 7 and casing 4 with cap 6 on the Main Unit in accordance with step
9. 4 with cap 6 on the unit so that a notch on the casing 4 match a notch on the unit case on connectors side and secure it with screws 9 Screws are locked with prime It is allowed to lock screws after testing is finished ACCELEROMETER REPLACEMENT Attention Be careful operating with gyroscopic unit Avoid shocks shaking abrupt turns If necessary turn gyroscopic unit smoothly and slowly one turn in 5 8 seconds Removed unit shall be stored and works with it shall be done on perolon shockmount January 2001 Cage Screwdriver Screwdriver Screwdriver Prime Brush Screwdriver Prime Brush Screwdriver Prime Brush Perolon Schockmount NN MAINTENANCE TASK Tools equip ment materials SCAN STEERING Page 38 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 Disassemble the Main Unit in accordance with step 4 2 fig 3 To remove unit 1 from the platform of the main Unit unscrew screws 12 and disconnect plugs XP3 XP4 from Screwdriver sockets 3 XS4 unscrewing captive screw of connectors Perolon Schockmount Unscrew screws 8 and remove glue from wire harness and bracket 3 Dismount base 2 with defective accelerometer Screwdriver together with wire harness and plug Mount new base 2 with accelerometer wire harness and Screwdriver plug on bracket 3 and secure it with screws 6 placing Prime Brush washers 4 under base bushings Screws are locked with prime Attach wire harness to bracket 3 w
10. 5 5 U eJ 6 6 ig lt 9 cH 3 iq D in O o Em 0 6 fo wl n n 5 5 5 0 5 IN 4 Q QU Q 675 27 a m lt e e e 2 a SCAN STEERING Page 49 z Unit Electrical Diagram page uronic Elec SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 y 2 V P g M 29 9 Qi Qu 7 a m m N lt X M U dor E v P 3 Qi C C 3 m m G 5 de 7 o S CU CU gt e m m m 9 d e G 3 qj 8 o o d D U 5 CU m m lt G b e ON n dg a m m m R 9 Q OS R P m m EB N 3 di No on dg ES ES x x e gt 02 7 ES t 4 2 gt 7 95 ea m D oe J 00 2 o a lt lt lt 0 lt lt lt G e e 4 gt n n n ON J lt lt lt lt o o 7 Lu x e e d Ug gt 3 To v N R CU 80 m O 9a s o al MSS sq n c Qu v Es e x Qu 4 ed Id n D gt gt gt gt gt gt gt 5 Y gt O 5 O O Zz gt 2 gt SCA
11. Main Unit in accordance with step 4 4 Make entry in the log on replacement of gyroscope Perform adjustment of Main Unit in accordance with step 4 7 Perform testing of Main Unit in accordance with step 4 8 CHECK AND ADJUSTMENT OF GYROCOMPASS SCAN 2000 AFTER ACCELEROMETER AND GYROSCOPE REPLACEMENT Check the time of gyrocompass self alignment on stationary base To do that e Remove casing 4 with cap 6 from Main Unit in accordance with step 4 2 and displace gyro unit to an angle 90 95 deg Or 265 270 deg Using Main Unit scale Put casing 4 with cap 5 on Main unit in accordance with step 4 4 4 Switch on gyrocompass and test it in accordance with paragraph 6 8 of Service Manual SCAN 461 001 N3 Record the time of lighting up green LED READY on front panel of Operator Console Make records of heading each 5 minutes within 1 hour Check settle point error and static error in accordance with paragraph 6 12 of Service Manual SCAN 461 524 001 N3 NN MAINTENANCE TASK Tools equip ment materials SCAN STEERING Page 41 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 In case settling time settle point error and static error do not meet requirements specified in Service Manual SCAN 461 524 001 N3 make adjustment of gyrocompass SCAN 2000 in accordance with step 4 7 3 To adjust gyrocompass SCAN 2000 switch it on in accordance with paragraph 6 8 of Service Manual SCAN 461 524 001 N3 When LED
12. Mooring Trials Quality of installation check point 6 6 point 6 6 Alignment of the Main Unit and peloruses point 6 6 point 6 6 insulation resistance Mohm 20 point 6 7 Gyrocompass setting time at unknown meridian with max error 1 deg point 6 8 Slaving of repeaters tot he readings of the operator Console deg 0 2 point 6 9 Check of brightness adjustment on the Main Unit Operator Console and point 6 10 point 6 10 repeaters Check of the course recorder point 6 11 point 6 11 Settle point error at one run up deg p lt 60 60 lt g lt 75 0 35 sec point 6 12 1 5 Static error at one run up deg 0 2sec point 6 12 Settle point error repeatability from one run up to another deg 0 25sec P point 6 13 Check of heading translator servo system parameters follow up time Damping time point 6 14 point 6 14 SCAN STEERING Page 11 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 Speed compensation error with 20 knots 0 2 sec point 6 15 speed correction deg Running Trials Remote data transfer error from the 0 point 6 16 Main Unit to repeaters deg Error due to a rapid alteration of point 6 16 speed of 20 knots deg p lt 60 60 lt P lt 75 Error due to a rapid alteration of point 5 16 course of 180 deg at a speed of 20 knots deg lt 60 60 lt g lt 75 Note Standard climatic conditions are characterized by the following parameter ambi
13. Page 23 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 SUPPLEMENT A ALIGNMENT OF PELORUSES Peloruses on which bearing repeaters are placed shall be installed in places that provide the best view for direction finding Line 0 180 of the bearing repeater azimuth scale shall be parallel to the longitudinal central plane of the ship with maximum error 0 2 degree Reading 0 of the scale shall be directed to the stern and 180 to the bow of the vessel The procedure of pelorus alignment shall be performed as follows On the basis of the coordinates that are known calculate the distance from the repeater to the jack staff or flag staff or any other marks which is located on the vessel s bow and stern for such purposes Calculate the angels between the longitudinal plane direction and the lines repeater jack staff repeater flag staff or repeater some other mark Place the direction finder upon the repeater Alignment mark of the direction finder shall match the scale reading that correspond to the calculated angle Secure the direction finder in this position Looking through the direction finder turn the pelorus together with repeater and direction finder until the vertical wire of the direction finder sight matches the jack staff To test the accuracy of the repeater course line alignment match the sight wire with the flag staff Secure the pelorus in it s position Alignment of the repeater can be made by
14. amp REPAIR MANUAL January 2001 1 Introduction This Service Manual SCAN 461524 001 NB is intended for gyrocompass SCAN 2000 operational personnel It includes all necessary data for proper usage technical support transportation and storage of gyrocompass as well a maintenance of its operational status SCAN STEERING Page 4 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 2 General Requirements 2 1 Reliable operation of gyrocompass SCAN 2000 is achieved by daily monitoring and observance of requirements given in this Manual 2 2 Gyrocompass SCAN 2000 is designed for navigation in latitudes up to 75 degrees at speed up to 90 knots under the following conditions temperature range from 10 C to 55 C from 40 C to 65 C for bearing repeaters peloruses and direction finders sinusoidal vibration in the frequency range from 5 to 80 Hz with amplitude 1 6 mm for frequencies from 5 to 13 2 Hz and with acceleration 10 m sq s for frequencies from 13 2 to 80 Hz rolling motion with amplitude 2042 and period from 6 to 15 s pitching motion with amplitude 1041 and period from 6 to 15 s yawing with amplitude 5 1 and period from 6 to 15 s voltage and frequency variations 220 22 V 50 3 Hz in vessel s AC electrical system and voltage variation from 19 2v to 31 2V in DC electrical system maximum tilt of 45 degrees Under these conditions gyrocompass provides determination of heading against geographi
15. getting bearing of the battens located on the bow and stern of the vessel They must be perpendicular to the longitudinal central plane of the vessel and their length must be equal to the displacement of a repeater against the central plane In case the repeater is installed in the longitudinal central plane bow and stern bearings will be 180 and 0 It is allowed to align peloruses in another way With the help of a direction finder that is mounted on the repeater measure angles against the reference line and after that calculate the angle of connection figure 1 by the formula ctg y ctg y ctg y2 ctg y 2 cte Qn 8 arctg SCAN STEERING Page 24 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 After calculation of the angle of connection b turn the left and the right peloruses with the repeaters to the b and b correspondingly Test the accuracy of alignment by taking the bearing of a remoter reference point minimum distance 2 nautical miles Difference between the bearing angles shall not exceed 0 5 degree Fasten peloruses 3 GE SA ane 7006 Central SCAN STEERING EH SOS igure 1 Alignment of pelorus skl plane line Page 25 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 SUPPLEMENT B SLAVING OF REPEATERS Each time you connect additional devises to the gyro
16. 4 4 below After testing final assembly of the Main Unit is made in accordance with step 4 4 Make an entry in the Log on repair performed NN MAINTENANCE TASK Tools equip ment materials SCAN STEERING Page 37 SCAN 2000 SERVICE amp REPAIR MANUAL FINAL ASSEMBLY OF MAIN UNIT Before final assembly thorough visual inspection inside the unit is made to check for proper mounting and absence of foreign objects Cage movable system I e lock gimbal against the bracket To do that screw the cage into the hole A of the bracket and align it with the hole E on the gimbal ring that should be tilted Place scale 7 with bushing 3 on the unit Align zero mark 0 with a notch on the unit case on connectors side and secure it preliminary with washer 5 and screws 10 Put casing 4 with cap 6 on the unit Align a notch on the cap with a notch on the casing Check alignment of zero marks on the scale 7 and the cap scale 6 In case of non coincidence remove casing 4 with cap 6 unscrew screws 10 remove washer 5 turn scale 7 to achieve alignment of zero marks and secure it again with washer 5 and screws 10 Put casing 4 with cap 6 on the unit and check alignment of scales In case of failure repeat the above procedure Remove casing 4 with cap 6 Secure scale 7 and bushing 3 with washer 5 and screws 10 Screws are locked with prime Remove cage from the unit Insert seal ring into the groove of the unit casing Place casing
17. 7 and remove clamp 10 that secure gyroscope 1 with wire harness and plug from the bracket 3 Screwdriver Unscrew screws 6 with washers 5 and remove defective gyroscope 1 with wire harness and plug from the bracket 3 Screwdriver Install new gyroscope with wire harness and plug bracket 3 and secure it with washer 5 and screw 6 Screws are locked Screwdriver with prime Prime Brush Secure wire harness on bracket 3 with clamp 10 and screw 7 Lock screw with prime Screwdriver Prime Brush Install resistor 3 a on platform of Main Unit in accordance with their codes R1 R2 and corresponding nominal value Screwdriver specified in Data Sheet for Gyroscope Resistors shall be Prime Brush placed with their codes down Secure with screws 10 and lock with prime Solder cable wires to resistors 3a in accordance with their Soldering iron marking fig 3 View C Tweezers Time of soldering 3 5 seconds L 100 120mm Temperature of soldering 230 250 C Stripper Use coarse calico cloth moistened in gasoline to clean Coarse calico places of soldering Tweezers L 100 150mm NN MAINTENANCE TASK Tools equip ment materials SCAN STEERING Page 40 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 Places of soldering shall be locked with yellow prime Prime shall be air dried at room temperature 1 layer for 3 hours 2 layer for 8 hours Install unit 1 on the platform in accordance with steps 4 5 6 4 5 7 Assemble
18. ATIONS OF HEADING ON THE OPERATOR CONCOLE DISPLAY OR ON THE REPEATERS WHEN THE SHIP IS NOT MOVING OR HER COURSE IS STEADY OR CHANGES SLOWLY IMMIDIATELY SWITCH OFF GYROCOMPASS RESTART OF THE GYROCOMPASS CAN BE MADE NOT EARLIER THAN TWO MINUTES AFTER SWITCH OFF SCAN STEERING Page 21 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 8 2 Possible trouble that may be corrected on board ship are listed in Table 3 Table 3 Possible Cause Indicator on the Supply Unit PS220 is not lit after the unit is switched on Indicator on the Supply Unit is lit but there is no indication on the digital display of the Operator Console after pressing START button Indicator on the Supply Unit is lit but there is no illumination on the repeaters Indicator on Supply Unit is lit but there is no illumination on one of the repeaters When the battery power is in use 24V DC there is no in dication on the digital display of the Operator Console when pressing START button Indicator on Supply Unit is lit but there is no indication on the digital display of the Operator Console after pressing START button High settle point error of the gyrocompass SCAN STEERING Blown fuse in the Supply Unit Blown fuse in the Supply Unit Blown fuse in the Supply Unit Blown fuse in the Electronic unit Blown fuse in Distribution Box Blown lamp of repeater lighting Blown fuse in the Supply Unit Blown fuse in the Supply Unit o
19. N STEERING Page 50 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 QU CD e Page 2 Q c 1 e 1 s e CT V G 4 e j U V i k V e e CU A4 Unit e T lt CU e Gia p a 7 Eas m m O GU x e e lt AST U D c e D ACT QU 0J a 1 E AG 3 m m S 9 AFO 4 Od lt punoan oublis e Qu e m 652 o ETA CU p R CU m N 9 o 2 e e CU mM x MN V V 2 55 A Mains U m 7 m 9 gt N 5 6 N o n gt gt gt gt E 0 CU KV o a 0 TA 3 Z T ea SCAN STEERING Page 51
20. NSTRUCTION CARD NQ 3 eese pie e pes 35 3 1 Supply Umit Replacement yuks esso nori n 35 3 2 Replacement of Printed Circuit Boards eene enne 35 4 INSTR GTION CARD NO 4222 E R ped 36 4 1 General Instructions eter here ar 36 42 Main Unit Disassembly ere emen doo Rin nds 36 4 3 Instrument Light Replacemant tenete 37 4 4 Final Assembly of Main Unit 38 4 5 Accelerometer Replacement stresses uo Ee TESTES Erop ERR Deed 38 4 6 Gyroscope Replacement edo ener He tt tosta e t ee est 40 4 7 Check and Adjustment of Gyrocompass SCAN 2000 After Accelerometer and Gyroscope Replacement san l ETH 000000000 41 4 8 Testing of Gyrocompass SCAN 2000 After Accelerometer and Gyroscope Replacement 42 DRAWING SCAN 468332003 Operator Console 43 DRAWING SCAN 468353001 Electronic Unit nnne nennen ens 44 DRAWING SCAN 462 515 001 Main Unit nennen nennen 45 DRAWING Unit eU as 47 WIRING DIAGRAM Electronic Unit eese een eene nene 48 SCAN STEERING Page 2 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 Service Manual SCAN 461524 001 NB SCAN STEERING Page 3 SCAN 2000 SERVICE
21. SERVICE amp REPAIR MANUAL SCAN 2000 GYROCOMPASS SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 CONTENTS SERVICE MANUAL SCAN 461524 001 NB 3 1 INTRODUCTION eee a aaa D Ta a a KANANE aa aa NTEN Ga Ng NE Tag Ga a NA NGA DR Ta NGON eag ga Kan 4 2 GENERAL REQUIREMENTS 555455349055 eor aE aa KENE a e PEE aan gag 5 3 SAFETY PRECAUTIONS L S ga Aa baa ga pa nga ag a NANA rrr 7 4 INSTALEATION AND WIRING ott aa NG a Ta R RR 8 53 PREPARATION FOR SEO 10 6 OPERATION PROCEDURE AND MEASUREMENT OF PARAMETERS esee 11 T TECHNICAL MAINTENANCE usb apa 17 8 FAILURE AND TROUBLE SHOOTING KARENAN KANA KANE GAN 21 9 STORAGE AND SHIPMENT INSTRUCTIONS ies ene 23 SUPPLEMENT A nte oce On Deb RF E 24 SUPPLEMENT 26 SUPPLEMENT ido ieget b E PER be b ei t tet A 27 REPAIR MANUAL SCAN 461841 001 12 tette 31 1 INSTRUCTION CARD NO 1 nee RR etre eR ete tee eei 32 1 1 General Requirements eite DT renin 32 1 2 Basic Requirement and Arrangement of Gyrocompass SCAN 2000 Repair 33 2 INSTRUCTION CARD NO Ziadie lessee 34 2 1 Indicator Replacement sissal Tas Sia pU hei ie Ri eic 34 3 I
22. and vibration are within the limits specified in Section 2 The Main Unit must be mounted on a rigid metal foundation that is secured to the deck close to the ship s center of mass Notches on the base of the Main Unit shall be parallel to the longitudinal central plane of the ship Accuracy of alignment shall be 0 2 degree Cable connectors of the Main Unit shall face the bow of the ship Free access to the Main Unit shall be provided from the side where connectors are located and from the top not less than 0 5 meter from all other sides 0 2 meters 4 2 2 It is recommended to place the Operator Console close to the working area of a navigator to ensure convenient manipulation of its switches and buttons The Operator Console can be secured on some vertical or horizontal plane due to it s rotating bracket Length of the cable that interconnect the Operator Console and the Electronic Unit shall not exceed 50 meters 4 2 3 It is recommended to install the Distribution Box in same room with Main Unit and the Electronic Unit Length of the cable connecting the Distribution Box to the Electronic Unit shall not exceed 50 meters 4 2 4 The bearing repeater shall be mounted onto a pelorus Axes of the repeater are placed into nylon sleeves that are inserted into slots of the gimbal ring of a pelorus The place of installation of analog and digital steering repeater shall guarantee the ease of the heading reading Length of cable connecting any rep
23. anuary 2001 1205 0 in Circuit ss Remarks X20 dii IPV 400Hz Uie c Pm 0 5 C f 2V 400Hz 4 RS232 0 5 oO 7 RS232 05 Oo 5 Screen 0 5 amp RS422 0 5 Sr RS422 11 cos K 5 cos K i 13 sin K 29 86 14 sin K O C Cable 6 10x0 5 500 pu rcuit in Remarks 1 STEP 05 E 2 Pm 6 3 35STEP 9 4 sste4v 05 O 5 GND 24V 08 6 6 2 0 5 O 7 ge 8 72 0 5 9 RS422 0 5 10 Scree 05 January 2001 SCAN 2000 SERVICE amp REPAIR MANUAL un Ayddns woh og 52 23 V 2004 SE yOUBUUSEH 0002 5 5532 AW ODO UAT 0 00 vcSI9v NVOS SEVEKE c 00 ce9689 NV 3S zx Avg SuloW sassaA HUN 12817 C 9 D el 2 0 0 x lt 59 SaD 60 ANaydiued 020020989705 00 29889 NVOS 3160502 HUN UN sex N Z Page 29 SCAN STEERING Cable 1 4x0 5 500 Pin Circuit Log SEC o Remarks X18 MM2 Pulse 05 Iw 2 Common Point 0 5 Pulse Inhibition Common Point CInhibi tion Pin X16 4x0 5 500 Cable 2 Circuit tRS422 RS422 RS232 4 RS232 0 5 Cable 3 7x0 5 500 Pin Circuit Pin Section Remarks X20 MM2 4 5 Um GND 74
24. ary pain casing or bracket with Gasoline black enamel 2 layers Before painting degrease the Coarse calico surface with coarse calico cloth moistened in gasoline Dry Tweezers first layer for 1 2 hours second layer for 6 7 hours at L 100 150mm temperature 18 25 C Test Repaired Operator Console within gyrocompass SCAN 2000 in accordance with the following paragraphs of Table 1 from Service Manual SCAN 461 524 001N3 B ICB SVB paragraphs 4 5 B SU TB CB paragraphs 4 5 6 8 9 10 12 B GSB HDB paragraphs 4 8 9 10 B SFB ASB paragraphs 4 8 9 10 12 Make an entry in the Log on repair performed SCAN STEERING Page 35 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 INSTRUCTION CARD NO 4 MAIN UNIT REPAIR NN MAINTENANCE TASK Tools equip ment materials GENERAL INSTRUCTIONS Repair works shall be performed in maximum short period of time after cap and casing are removed In case of intervals in work put the cap back our use a film to cover gyro unit Removal and mounting of casing 4 with a cap must be performed with care Casing must be tilted to prevent damage of scale 7 MAIN UNIT DISASSEMBLY Unscrew screws 9 and remove casing 4 together with Screwdriver cap 6 Unscrew screw 10 and remove washer 5 and scale 7 Screwdriver together with bushing 3 Unsolder 2 wires 17 of thermal sensor Iron Tweezers SCAN STEERING Page 36 SCAN 2000 SERVICE amp REPAIR MANUAL January
25. ashers 10 11 Connect plug X of indicator to the socket 13 of the Operator Console Screwdriver Place indicator board 2 on the front panel 5 and secure by Prime Brush screws 7 Lock screws with prime Connect plug XP3 of Operator Console to Socket XS3 Connect plugXP4 to socket XS4 on flat cable of panel 5 Screwdriver Place gasket 6 and panel 5 on the casing of Operator Prime Brush Console and secure by screws 8 Lock screws with prime Test repaired Operator Console within gyrocompass SCAN 2000 in accordance with paragraph 6 of table 1 from the Service Manual SCAN 461 524 001N3 Make an entry in the Log on repair performed SCAN STEERING Page 34 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 INSTRUCTION CARD NO 3 ELECTRONIC UNIT REPAIR NN MAINTENANCE TASK Tools equip ment materials SUPPLY UNIT REPLACEMENT Supply Unit replacement is made in accordance with the following procedure Screwdriver Unscrew screws 11 and remove defective Supply Unit 1 Screwdriver Place new Supply Unitl into the casing and secure with screw 11 with washers 12 13 REPLACEMENT OF PRINTED CIRCUIT BOARDS Screwdriver Unscrew screws 10 and remove defective board 2 9 Extractor together with screws Screwdriver Place new board 2 9 into Electronic Unit and secure it Prime Brush with screws 10 Screws are locks with prime Brush Inspect Electronic Unit appearance for coating Black enamel deterioration If necess
26. cal meridian transmission of heading data to analog and digital receivers automatic receipt of speed and latitude inputs from GPS automatic receipt of speed input from log manual input of speed and latitude remote control from the Operator Console connection with electric radionavigational equipment including radio direction finder radar autopilot integrated navigation system etc 2 3 Gyrocompass preserves its performance being exposed to the following conditions minimum temperature 60 C ceiling temperature 70 C excessive humidity 95 at temperature 40 C mechanical impact with maximum acceleration 100 m sq s and pulse duration 10 15 ms 2 4 Gyrocompass has the following power supply circuits e 24V DC for the basic modification 220Vm 50 Hz and 24V DC battery when modified with power supply 2ps 220 2 5 Installation and wiring of the gyrocompass is carried out after all construction and finishing works in navigation spaces of the ship are done SCAN STEERING Page 5 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 2 6 Before introduction into service the gyrocompass should pass mooring and running trials according to the procedure and in terms specified in Section 6 2 7 Gyrocompass operation conditions shall meet requirements for static electricity Allowable value of electrostatic potential is 100 V SCAN STEERING Page 6 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 3 Safety Precautio
27. compass it is necessary to check repeater slaving to the readings of the Operator Console SCAN STEERING Page 26 January 2001 SCAN 2000 SERVICE amp REPAIR MANUAL SUPPLEMENT C Dome SCAN 2000 OM JU Gyro m Ora N 2 JIQ a6ody 38S 2 508 woubvig 16221581 0002 NVOS 55000009 9t 1001219217 NVOS udiJ p2 SUM 5 355 00 298589 NVOS 02X 43 LIX RENE 0002096805 13 SIX 002295689705 SIX S 3105002 03010 2X ON Page 27 SCAN STEERING SCAN 2000 SERVICE amp REPAIR MANUAL able 1 4x0 5 500 E Pin Circuit og Section Remarks X18 MM2 1 Pulse 05 2 Common Point Jio gt Pulse 7 3 Inhibition 0 5 4 Common Point 0 5 Inhibition Cable 2 4x0 5 500 Pin X16 Circuit Section MM2 Remarks RS422 0 5 2 3 4 YO RS422 2 RS232 able 3 7x0 5 500 Pin 024602 I Circuit Pin 55 241 GND 24V tRS232 RSe3e RS422 RS422 Screen 200 able 4 0 f Circuit Pin MM2 sect en Remarks M M2 05 05 ERI QUE 4 0 5 05 C 0 5 Section Remarks n 24V Cinalns 1 0 24V Cinalns 1 0 24V n 4 24V V SCAN 461524 001 36 Cable J
28. e is replacement of defective parts with new ones from group set of spare parts SCAN 461 841 001 All item numbers of parts and assemblies in Instruction Cards relate to figures 1 2 3 and 4 of the illustrated Parts Catalog All repair works shall be executed by qualified servicemen familiar with gyrocompass design and operation and authorized to make repairs Requirement for the compartment where gyrocompass SCAN 2000 repairs are carried out E ambient temperature 25 10 C 298 10 K B ambient humidity 65 15 6 H ambient atmospheric 750 30 mm Hg pressure 100000 4000 Pa To prevent electrostatic charges during gyrocompass assembly and disassembly definite measures shall be provided 8 e g antistatic bracelet SCAN STEERING Page 32 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 NN MAINTENANCE TASK Tools equip ment material BASIC REQUIREMENT AND ARRANGEMENT OF GYROCOMPASS SCAN 2000 REPAIR Repair of units is performed after investigation of the cause and compilation of list of Defects List of Defects is the main document and authority for replacement of assemblies and units Before disassembly thorough visual inspection of units is made to check for dents cracks chips and deformations Initial cleaning of surface is made During disassembly all small parts shall be placed and store in special separation boxes Screws bolts and nuts shall be handled with care to prevent their dama
29. e there is no marking of the line parallel to longitudional center plane of ship pelorusses alignment shall be made in accordance with the Supplement A 6 7 Insulation resistance check is made as follows e All modifications Measure insulation resistance between the Electronic Unit and connector s pins X12 3 X12 4 X19 4 with the help of a teraohmmeter with voltage range 100V Modification SCAN 461524 001 01 In addition to the above mentioned measure insulation resistance between the casing of the Supply Unit PS 220 and connector s pin X1 1 with power switched on Use a teraohmmeter with voltage range 500V In all cases insulation resistance shall not be less than 20 Mohm Testing of the gyrocompass settling time is performed in the following session 1 When the gyrocompass is prepared for use in accordance with Section 5 of this Manual energize the Electronic Unit with supply voltage 24V DC Modification SCAN 461514 001 Switch on external supply of 24V DC Modification SCAN 461524 001 01 Switch on external supply of 220V AC 50 Hz and 24V DC 2 Set the local latitude by the LATITUDE switch on the Operator Console the upper switch is for tens in the range from 0 to 180 degrees the lower is for units in range from 0 to 9 degrees 3 Switch on the gyrocompass with the button START on the Operator Console The START button lights 4 Use buttons NORTH or SOUTH on the Operator Console to set the correspondent hemisphere A
30. eater DE 180 DE 200 BRA 250 BRB 250 BRC 250 to the Electronic unit or Distributor Box shall not exceed 200 meters 4 2 5 Peloruses shall be installed in places that ensure maximum field of view for the direction finding Line 0 180 of the bearing repeater azimuth scale shall be parallel to the longitudinal central plane of the ship with maximum error 0 2 degree Reading 0 of the scale shall be direct to the stern and 180 to the bow of the vessel SCAN STEERING Page 8 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 4 2 6 Location of the course recorder shall provide the ease of data reading and servicing 4 2 7 It is desirable to place Supply Unit PS 220 in the same room with Electronic Unit Length of cables connecting the Supply Unit with Electronic Unit and vessel s mains shall not exceed 25 meters 4 2 98 The minimum distance between the units of the gyrocompass and the magnetic compass shall be 0 5 meter with the following exceptions Peloruses and course recorder minimum 1 5 m Bearing Repeaters minimum m 4 3 Wiring of Gyrocompass Units 4 3 1 Wiring of the gyrocompass SCAN 2000 is performed in accordance with 4 3 2 Wiring Diagram SCAN 461524 001 86 for the basic set e Wiring DiagramSCAN 461524 001 01 B6 for basic set with PS 220 power supply They are given in the Supplement c to this Manual 4 3 2 Two independent feeders can be provided to energize the gyrocompass Modifications SCAN 461524
31. ectronic Unit to GA and simultaneously start the stop watch Let the gyrocompass operate in GA mode for an hour and after that make another reading of the heading H1 Set the switch GC GA to GC position d determine the value of the azimuth drift for the period of 1 hour by the formula taking the sign into account AH HI Ho The value of DH will be positive if the second reading is greater than the first and vice versa e if DH exceeds 0 2 deg measure the value of the DC voltage UwA taking the sign into account on the jacks wA and O T common point of the Electronic Unit Use the digital voltmeter for measuring The signal lead of the voltmeter is connected to wA and the common lead to O T f calculate the azimuth drift compensation voltage taking the sign into account by the formula Ucom AH 400 mV deg g turning the potentiometer wA on the Electronic Unit set the new value of DC voltage U wA on the jack wA equal to U wA Uo A Ucom taking the sign into account calculate once again the azimuth drift value in accordance with p 7 3 4 6 The difference SCAN STEERING Page 18 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 AH 111 Ho shall not exceed 0 2 degree otherwise compensation must be repeated Example Ho 0 4 hl 359 6 UwA 100 mV AH HI Ho 359 6 0 4 0 8 Ucom AH 400 Mv deg 0 8 400 mV deg
32. ent temperature C 25 10 e relative humidity 65 15 e atmospheric pressure Pa mm Hg 100000 4000 750 30 6 3 At the mooring trials the bow of the ship shall be directed to the North with maximum deviation in direction 45 degrees Course deviation during the trials shall not exceed 0 25 degrees During the trials a bearing of reference points is taken A distance from the reference points to the ship shall be minimum 2 nautical miles The bearing is read out from one of the bearing repeaters in series of 3 5 bearings Arithmetic value of compass bearing is determined for each series 6 4 Running trials shall be carried out in the region equipped with the head ranges that are seen from the ship during 30 minutes of movement with the maximum speed The true bearing shall be as close to 0 or 180 as possible 6 5 The results of the mooring trials shall be written in the gyrocompass record book 6 6 The quality of installation is tested in the following succession e check of the product completement in accordance with the record book e check of the quality of electrical wiring connections the reliability of grounding safe distance from magnetic compass in accordance with points 3 3 3 4 4 3 1 4 3 3 4 2 9 SCAN STEERING Page 12 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 e check of the Main Unit installation in accordance with point 4 2 1 e check of peloruses installation in accordance with point 4 2 5 In cas
33. f the Electronic Unit Change of gyro unit bias drift Replace defective fuse with a new one Replace defective fuse with a new one Replace defective fuse with a new one Replace defective fuse with a new one Replace defective lamp with a new one Replace defective fuse with a new one Replace defective fuse with a new one Perform bias drift compensation in accordance with p 7 3 4 Page 22 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 9 Storage and Shipment Instructions 9 1 The gyrocompass shall be stored in the manufacturer s packing in a storehouse where heating and ventilation are provided Air temperature range in the storehouse shall be from 5 to 40 C Maximum relative humidity shall be 80 at temperature 25 C 9 2 Storage time without re preservation is 3 years 9 3 Gyrocompass units in the packing can be transported by all means of transport to any distance and shall withstand the influence of the following weather conditions e change of ambient temperature within the range of 60 to 60 C e maximum relative humidity 100 at temperature 35 e maximum rain intensity 5 mm min influence of sunlight and dust is allowed 9 4 Packing boxes with gyrocompass units shall be fastened during transportation to prevent their movement Fastening of cargo is made in accordance with the regulations and instructions that are in use for the correspondent means of transport SCAN STEERING
34. fter pressing the button lights Write down the time when the gyrocompass was switched on in the record book The operator Console digital display will indicate the azimuth position of gyro unit against ship s central plane on the moment of the gyrocompass switching on The gyrocompass is automatically aligned Alignment time is within 25 to 120 minutes and depends on the gyro unit initial angle of deflection from the meridian and run up conditions temperature inclination angle local latitude The gyro is considered to be aligned when the green LED READY on the front panel of the Operator Console lights Settle point error shall not exceed 1 degree Fine alignment of gyrocompass with the settle point error 0 35 degree per secant latitude can be achieved within maximum 2 hours after illumination of READY indicator dependent on sailing conditions SCAN STEERING Page 13 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 6 9 The check of adjustable lights for illumination of gyrocompass and repeaters readings is carried out after testing under the point 6 8 Turning the dimmers on the Operators Console DE180 DE200 BRA250 BRB250 BRC250 check the existence of light and adjustability of brightness 6 10 The course recorder is checked in accordance with the specification for the given recorder 6 11 The check of the settle point error and static error in one run up is made as follows 1 When the gyrocompass is ready for operation bu
35. ge When unsoldering is made all wires shall be marked with identification sleeves or in some other manner After disassembly all parts shall be cleaned of dust and waste products Good attaching parts and holes in parts and assemblies shall be washed in acetone gasoline or any other solvent When reassemble is made bolts screws nuts without springs washers are locked with a prime in accordance with the following procedure B attaching parts are degreased with gasoline and then air dried for 20 30 minutes W 2 3 of screw thread is primed then it is screwed in and tightened H prime is dried during 2 5 hours at temperature 18 35 C SCAN STEERING Page 33 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 INSTRUCTION CARD NO 2 OPERATOR CONSOLE REPAIR NN MAINTENANCE TASK Tools equip ment materials INDICATOR REPLACEMENT Indicator replacement is made in accordance with the following procedure Screwdriver Unscrew screw 8 turn back switching panel 5 and disconnect plug XP4 from the socket XS4 of the panel 5 flat cable Screwdriver Disconnect plug XP3 from the socket XS3 Unscrew 5 screw 7 that secure indicator board to the panel5 and remove the board Screwdriver Disconnect indicator plug X1 from Operator Console socket 13 Unscrew 4 screw 7 with washers 10 11 that secure indicator to socket 13 of the Operator Console Screwdriver Place new indicator 2 and secure I on the casing 4 by screws 7 with w
36. iometer is U wr Uor Ucom 600 mV 42 mV 642 mV SCAN STEERING Page 20 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 8 Failure and Trouble Shooting 8 1 Built in test facilities are provided for gyrocompass check and rapid fault diagnosis Malfunction warning circuit generates acoustic signal and red indicator of FAILURE light on the front panel of the Operator Console In case of failure following must be done switch off the gyrocompass check the voltage in the ship s mains check the setting of SPEED and Latitude switches on the Operator Console not earlier than 2 minutes after this switch on the gyrocompass and set the correspondent hemisphere with button NORTH or SOUTH If FAILURE indicator is still lit it is necessary to apply to the service center or to the manufacturer Malfunction warning circuit generates the failure signal also in case of log failure if the gyrocompass is operating with the log and SPEED switch is set to LOG and in case of lack of speed and latitude data from GPS receiver if the gyrocompass is operating with GPS and SPEED switch is set to GPS In case of servo system failure in the Electronic Unit one or both ASB PCBs red indicator of failure is lit and in approximately 8 seconds the gyrocompass is switched off Please notice that in case of the servo system failure the signal is generated only 2 minutes after the gyrocompass is switched on ATTENTION IN CASE OF RAPID ALTER
37. ith help of a clamp 11 Screwdriver and screw 9 Screw is locked with prime Prime Brush Install unit 1 on the platform of the Main Unit and secure Screwdriver with screws 12 Place clamp 18 under one of the screws Prime Brush and secure an accelerometer mounting cable with it Lock screw with prime Connect plug XP3 XP4 to sockets XS3 XS4 of the Screwdriver platform ands secure with captive screws Place a level on the surface A of bracket 3 and balance Squared level the platform about its gimbal axis 1 with a pin see fig 3 200 0 05 View B Level bubble displacement from zero shall not Screwdriver exceed 0 5 Of scale division Remove the level Assemble the Main Unit in accordance with step 4 4 Make an entry in the Log on replacement of accelerometer Perform adjustment of Main Unit in accordance with step 4 7 Perform test of Main Unit in accordance with step 4 6 NN MAINTENANCE TASK Tools equip ment materials SCAN STEERING Page 39 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 GYROSCOPE REPLACEMENT Disassemble the Main Unit in accordance with step 4 2 2 fig 3 Dismount the platform from the Main Unit in accordance with step 4 5 2 To remove resistors 3a from the main Unit unsolder wires from resistors 3a simultaneously marking wires of a Soldering iron mounting cable Tweezers Time of soldering 3 5 seconds L 100 120mm Temperature of soldering 230 250 C Unscrew screw
38. ns 3 1 Only trained personnel familiar with the design and working principle of the gyrocompass SCAN 2000 Specification SCAN 461524 001 TO is permitted to operate this instrument 3 2 When working on the gyrocompass it is necessary to observe the safety regulations on service of electrical devices as well as standing safety engineering and fire safety rules 3 3 Devices that constitute the gyrocompass SCAN 2000 shall be grounded to the hull in the shortest possible way Successive grounding is not allowed 3 4 Shielding of interconnect cables shall be electrically connected with the hull 3 5 When the gyrocompass is operating all it s covers must be locked 3 6 Installation wiring and replacement of the gyrocompass units are carried out only when the gyrocompass I de energized 3 7 Rating of fuses shall correspond to that indicated on the devices Replacement of fuses is made only when the gyrocompass is switched off SCAN STEERING Page 7 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 4 Installation and Wiring 4 1 Before the installation and wiring of the gyrocompass on the ship one should carefully study Specification SCAN 461524 001 TO as well as Specification for all periphery equipment 4 2 Installation of Gyrocompass units 4 2 1 Distance between the Main Unit and the Electronic Unit shall not exceed 2 meters They must be placed in a room where there are no sudden temperature fluctuations and humidity
39. of ship s running For each compass bearing Cbi the error is calculated by the formula 5H TB CBj SPE Values Hi received during the running trials shall not exceed those specified in the Table 1 6 14 6 During the running trials it is necessary to compare the heading indicated on the Operator Console display and the readings of repeaters Difference shall not exceed 0 2 degrees 6 15 To test the operational status of all navigation equipment installed on the ship mooring and running trials shall be performed annually SCAN STEERING Page 16 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 7 Technical Maintenance 7 1 Technical maintenance includes e on line maintenance that is performed at each switch on and switch off of the gyrocompass e periodic maintenance that is performed annually if the gyrocompass is installed on a sailing ship as well as after the repair or long storage period of the gyrocompass Technical maintenance of the gyrocompass and trouble shooting on board the ship are performed by the specialist who is responsible for its serviceability Repair of the gyrocompass and post repair test are made by the authorized personnel of service centers 7 2 Main checks 7 2 1 On line maintenance consists of the gyrocompass condition check in accordance with the requirements of the point 7 3 1 of this manual 7 2 2 Periodic maintenance of the gyrocompass is performed in accordance with the Table 2 Table 2
40. onsole and de energize Modification SCAN 461524 001 external 24V DC power supply Modification SCAN 461514 001 01 external 220V AC and 24V DC power supply 2 After at least 12 hours but not later than 7 days the gyrocompass is started again and the determination of the settle value of the compass bearing Cbset and settle point error SPE is repeated in accordance with the procedure specified in pp 6 8 6 11 81 3 The difference between SPE in the first and the second run up is considered to be the indication of the settle point heading instability This value including the Main Unit and peloruses alignment error shall not exceed the value given in Table 1 6 13 Speed compensation error is checked after the gyrocompass is tested under p 6 12 e Set the SPEED switch on the front panel of the Operator Console to 20 knots e Three hours later take a bearing and define the new value of the settled compass bearing CBset in accordance with pp 6 12 1 6 12 11 e Calculate speed compensation error by the formula AEsp CBset CBset ACbcom where is the settled value of compass bearing in the second run up determined in accordance with p 6 12 ACbcom is theoretically computed value of the settle point heading for the latitude of the test by the formula ACBcom 1 27 cosK sec lat Where K is the course at which the ship is moored and lat Is the local latitude Speed compensation error ESP including alignment er
41. ror of the Main Unit and peloruses shall not exceed the value specified in Table 1 SCAN STEERING Page 15 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 6 14 The following procedure is recommended for the running trials When the mooring trials are finished she ship goes to the region of the running trials and heaves aback or comes to an anchor for the time period of 2 hours minimum After that the ship at a dead slow speed is brought on the ranges Moving along the ranges she rapidly increase her speed up to 20 knots Follow up the increase of speed manually turning the SPEED switch on the Operator Console If the log is connected to the gyrocompass set the upper switch SPEED on the Operator Console to LOG If GPS receiver is connected to the gyrocompass set the upper switch SPEED to GPS position In the last two cases green indicator LOG GPS lights on the Operator Console When the ship approaches the range as close as possible at speed 20 knots she turns to 180 degrees and proceeds in reverse direction along the ranges until they are seen The actual scheme of the ship s running is adapted to the circumstances of navigation When the ship is within the ranges and her speed rapidly changes to 20 knots and her course to 180 degrees compass bearings of the range true bearing of which is known with an accuracy 0 2 degree is taken from one of the peloruses with intervals of 5 10 minutes Interval duration depends upon the scheme
42. t not earlier than 2 hours after switch on take 10 readings at 20 minutes intervals of compass bearing CB of a remote reference point the true bearing TB of which is known with the error 0 2 degree maximum 2 Use these 10 readings to calculate the settled value of the compass bearing by formula 10 CBset i l where CBi ten readings taken at 20 minutes intervals 3 Calculate the settle point error SPE as the difference between the settled compass bearing Cbset and true bearing TB of the reference point SPE value shall not exceed the one given in the Table 1 If SPE value is beyond tolerance limits check the correctness of installation of the main unit and peloruses under the point 6 6 4 Calculate the difference between the Cbset and each of ten readings CBI by the formula DCBi Cbi Cbset 5 Calculate the static error Est as RMS value of differences between ten individual values of compass bearing CB and CBset by the following formula 10 Est lcs i l Error shall not exceed the value specified in Table 1 SCAN STEERING Page 14 SCAN 2000 SERVICE amp REPAIR MANUAL January 2001 6 12 Settle point error repeatability from one run up to another is tested after the above p 6 11 test is finished and the settle point error SPE in the first run up is determined The procedure of testing is as follows 1 Switch off the gyrocompass pressing STOP button on the front panel of the Operator C
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