SATELLITE COMPASS SC-50/110
The paper used in this manual is elemental chlorine free. FURUNO Authorized Distributor/Dealer 9-52 Ashihara-cho, Nishinomiya 662-8580, JAPAN Telephone : 0798-65-2111 Fax 0798-65-4200 : All rights reserved. Printed in Japan Pub. No. SME-72510-A ( KAOK ) SC-50 FIRST EDITION : NOV.
Contents 1. Overview ...................................................................................... 1 2. Maintenance Menu ....................................................................... 2 1) MONITOR display ..............................................................................2 2) COMPASS display .............................................................................3 3) R MONITOR display ..........................................................................
1. Overview The satellite compass, SC-50/110 calculates the heading by using the carrier signal of the GPS satellite signals. The system also calculates the heading with three rate sensors. When the satellite signal is blocked, the system outputs the heading data based on the rate sensor signal for a maximum of 5 minutes. The system always compares GPS heading with rate sensor heading. If the difference between two exceeds the preset value, an alarm is generated.
2. Maintenance Menu The system provides TEC menu or Maintenance menu for servicing. To show TEC menu, press and hold down MENU and ENT keys simultaneously until the menu appears after three beeps. It takes about 8 seconds to hear the third beep. Release the finger from MENU key, and then ENT key. If you release the finger from ENT key first, Main menu appears. This procedure is the same as SC-60/120.
2) COMPASS display MASK-EL is used to set a minimum elevation angle of the satellite. The satellite of which elevation angle is lower than MASK-EL is not used for heading calculation. Default: 5 degrees. DO NOT change GPS DELAY, TIME CONST, SDEV-S, SDEV-C, and CHK NEW SV. COMPASS MASK-EL : 05° GPS DELAY : 0.220 SEC TIME CONST : 01 SEC SDEV-S : 0.0016 SDEV-C : 0.0069 CHK NEW SV : 0.20 Fig.4 COMPASS display 3) R MONITOR display “Rate sensor Monitor” display shows rate sensor errors as below.
4) R-CALIB display R-CALIB (Rate sensor Calibration) is used to enter the calibration value of the rate sensor at factory. It is not necessary to change this value when the rate sensor is replaced with new one. However, the value on top of the original sensor is written on top of the replacement sensor for future service. R-CALIB S1 : +0.0% S2 : +0.0% S3 : +0.0% Fig.6 S2 (Roll*) S3 (Yaw*) S1 (Pitch*) *: Default Fig.
5) RATE ERR display This menu sets the level to trigger the heading error alarms; NO HEADING OUTPUT and RATE ERROR. The system compares the output of the angular rate sensor with one obtained by the GPS signal. In the following example, an error is detected when the difference is 2.0º or more. An alarm is generated according to SHIFT CONT setting. In the example below, an alarm is generated when Roll sensor has four consecutive errors. YAW LIMIT: Used to detect Yaw output error.
7) ALARM display This menu sets the ALARM port signal. When ALARM MODE is set to “STOP,” the alarm signal is not sent out after acknowledgement. When selected “Continue,” the system continues to output the alarm signal. ALARMS ALARM MODE : STOP BUZZER FREQ : 2.075 kHz Fig. 10 8) ANALOG display This menu is used to test and compensate the motion sensor output signal. Set the desired angle on the ANGLE line and the set angle data is output from “ROLL” and “PITCH” ports.
The display consists of four indications; a circular graph which shows direction where the tracking error rate is the highest, a bar graph which shows tracking error rates in 12 directions, mutlipath indexes, and elapsed time. Circular graph: Shows the relation of 12 directions to the bow. The direction of the highest tracking error rate and its opposite direction are painted. Note that the sectors are painted even when no heading loss problem occurs. Bar graph: Shows tracking error rate in 12 directions.
10) MESSAGE display Error messages appear in the display. If RATE ERROR! appears, first check Installation Setup menu for correct setting: “Mounting” method and “Direction.” MESSAGES • NO HEADING OUTPUT ! • HEADING ERROR ! • RATE ERROR ! (YAW) Fig.14 Error Message display 11) REC MONI menu The REC MONI display, Figure 15 shows whether the system works normally or not. The GPS receiver having the least tracking error rate reads 1.0. The error rate of other receivers is between 0.7 and 0.9 normally.
3. Replacement of Battery The processor unit has a battery which backs up the RAM contents when the power is removed. When the voltage of the battery drops to 2.5 V, the message “BATTERY!” appears on the screen. To check the message, press [MENU] key and choose “MESSAGE.” The lifetime of the batteries is 3 to 5 years. CAUTION! Take care to avoid short-circuit of the battery. This could create a burn or fire hazard. Do not dispose of the battery in a fire or an incinerator; this may cause an explosion.
5. Program Upgrade The three programs are used for the SC-50/110. Two programs are used in the processor unit and one program is in the display unit. The program numbers are tabulated below. Note that the program number of SC-50 is the same as SC-110, but they are different. The program for SC-50 cannot be overwritten by the one for SC-110 in the field and vise versa. (As of February 2005) Unit Board Processor unit Display unit Program No. How to update MAIN board 205-1341-01.
2) CPU board (Display unit) To upgrade the program on the CPU board; 1. Connect the serial port of the PC to J15 on MAIN board in the processor unit. 2. Turn on the PC. Do not as yet turn on the SC-50/110. 3. Click the SCUP.bat file in the SC-50/110 program file. 4. Turn on the SC-50/110 after the message “TARGET POWER ON” on the PC screen. 5. “NOW LOADING” appears on the SC-50/110 display unit, while “Now Erasing,” and “xxx percent completed” appear during program upgrade on the PC screen,. 6.
6. Maintenance 6.1 Adjustment 1) PWR board Switching regulator frequency is adjusted on PWR board, 20P8181 as below. Test Point GND Rating Adjuster TP2 TP1 120.0 kHz ± 10 kHz VR79 TP5 TP3 120.0 kHz ± 10 kHz VR80 2) MAIN board Vcc-c supply voltage to Rate sensor is adjusted by VR96 on MAIN board, 20P8178. Test Point GND Rating Adjuster #1 of J20 #2 of J20 5.0 V (Vcc-c) VR96 6.2 Line voltage check Line voltages are checked at J3 on the MAIN board.
7. Location of Parts Rate Sensor (Default: Roll) Rate Sensor (Default: Yaw) Rate Sensor (Default: Pitch) PWR Board (20P8181) GPS Receivers (1, 2, 3 from Top) Main Board (20P8178) Fig. 17 Processor Unit with cover removed F1, 3A TP2 TP1 TP4 Fig.
Log/Alarm Roll (above) Pitch Beacon Ext Data out 6 Data In (AD-10) Data out 1 to 5 (from right, IEC or AD-10 Heading data) J3 J15 for system update R96 CR3 (CPU), Blinking No short bar (for R&D) TP1 JP1 BT1 (CR2450-F2ST2L) Fig.
Appendix 1 Protection of ICs in Data Output Circuit Appendix 1 describes how to prevent ICs in the data output circuit temporarily. Refer to Appendix 2 for permanent remedy. Symptom U1, U2, and U3 in the heading output circuit are damaged. Cause Ground potential difference - The cable shield, or a signal return path between the circuit grounds of the equipment is not connected securely. The shield is connected to the unit through the cable clamp on SC-50/110, while the connector pin is used on SC-60/120.
1. Fabrication of Signal Cable The signal cable is fabricated as below. DO NOT hold back the cable shield over the armor. The installation manual will be revised. 80 Armor 70 Twist and cut. FV1.25-M3 Grounding wire Solder 40 Remove coat for clamping. 80 Armor Twist and cut. 70 FV1.25-M3 Grounding wire Solder 40 Vinyl tape Fig. 2 16 Remove coat for clamping.
2. Grounding Cable Shield Ground the cable shield or grounding wire to the chassis by using the screw fixing the MAIN board, 20P8178 to the chassis. Fig.
3. Adding Zener Diodes Zener diodes are added to the data output circuit as below. 1. Fabricate the diode as shown in the figure below. Type: RD9.1EB3-T4 4 mm C/N: 000-138-700 4 mm 2 mm 4 mm 4 mm Fig. 4 Fabrication of zener diode 2. Remove the coat and solder the diode. See Fig. 5. 3. Do the same for other pins and other ports. J2 J3 J4 Remove the coat and then solder the anode. Do the same for other diodes. Fig.
Reference) The following waveforms show the effectiveness of the modification. With the SC-50/110 processor unit being not modified, a spike noise is observed at the output terminal on SC-50/110 when the interconnected unit is turned on. (Fig. 6) After modification, the noise is not observed. (Fig. 7) Before modification Condition: SC-50 switched off Measuring points: CH1: TD1-A (pin #1) on DATA 5 port CH2: TD1-B (pin #2) on DATA 5 port Ground lead: SG (=FG) on SC-50 Fig. 6 After modification Fig.
Appendix 2 Modification on Data Output Circuit Appendix 1 describes the tentative remedy to prevent U1, U2, and U3 in the heading output circuit from being damaged. Following modification (Table below) is the permanent remedy. The connector is changed from 4 pins to 5 pins for the connection of cable shield. When installing the unit having the current MAIN board (-55); 1) Connect the cable shield to pin #5 of DATA OUT port. 2) Ground the frame of SC-50/110 securely.
ﾐﾆｸﾗﾝﾌﾟ MINI CLAMP UAMS-05-0 (000-141-865) PW M4 SW M4 N 4M PW M4 PW M4 SW M4 W ing Nut M4 ｶ-ﾄﾞｽﾍﾟ-ｻ CARD SPACER KGPS- 3S (000-801-836-10) ｺﾈｸﾀ (231) CONNECTOR 231-302/026-FUR (000-148-883) +-ﾅﾍﾞｾﾑｽ ﾈｼﾞB WASHER HEAD SC REW *B* M B NI2 C 2700W M 3X8 (000-881-404) ﾐﾆｸﾗﾝﾌﾟ MINI CLAMP UAMS-0 3-0 (000-136-792) ｺﾈｸﾀ (ｸﾐﾋﾝ) CONNECTOR PH 7P-M J7P-L 260 (000-148-552) ﾊ -ﾈｽﾘﾌﾀ HARNESS LI FTER HL-1 8-0 (000-808-214-) ｽｲﾂﾁﾄﾘﾂｹｲﾀ SWITCH MOUNTING PLATE 20-024-2005-1 (100-310-701) ﾌﾞﾗｲﾝﾄﾞﾌｲﾙﾑ B LIND FILM 20-024-2
GPS ｱ ﾝﾃﾅ GPS ANTENNA ASSEM GSC-00 1 (004-382-480) B LY B LY MODEL B LY O S.kubota T.Yoshida H.Kuwamura DRAWN 06 Sep.2005 CHECKED SC-50 N 06 Sep.2005 06 Sep.2005 APPROVED ﾄﾞｰﾑｼﾀ ｸﾐﾋﾝ RADOME LOWER ASSEM SC-303 (004-378-140) ﾎ ﾞｳｼﾖｸﾊﾟﾂ ｷ ﾝ ANTI-CORROSION GASKET 20-020-3212-0 FURUNO ﾏ -ｸ FURUNO LOGO STICKER 03-151-3102-1 ﾄﾞｰﾑ ｳ ｴｸﾐﾋﾝ RADOME COVER ASSEM SC-303 (004-378-120) DWG.NO.
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