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Issue 1.0 09/06/03

SIMRAD

39

threshold level is reset at the end of each receive period by the microprocessor port P2.1 via Diode
D10.  Any signal exceeding the threshold is passed to the microprocessor for processing.

5.2 

Hand Controller PCB Assembly

.  Refer to Drawing Number 

E03721

.  The

Hand Controller provides remote control of any display connected into an IS12 network.
Individuals displays may be selected in turn and, once selected, the remote keypad provides the
same services as the keypad on the desired instrument.  With the exception of component labelling
the circuitry is identical to that of the generic Display PCB and no further explanation is considered
necessary.

5.3 

Mast Head Unit

.  The Mast Head Unit detects the wind speed and direction

and provides the information to the various instruments for display and / or data manipulation.

Motherboard PCB

.  Refer to Drawing Number 

E03724

.  .  With the exception of component

labelling the Supply and Regulation, Microprocessor, NVM and CANBUS circuitry is identical to
that of the generic Display PCB and no further explanation is considered necessary.

Refer to Drawing Number 

E03934

.  Wind speed is detected by a Hall Effect Device IC3 which is

triggered by 2 magnets mounted in the anemometer.  The output of IC3 is fed directly to the
microprocessor ports P6.4 to 6.6.

Refer to Drawing Number 

E03931

.  Wind angle is detected by a pair of matched linear Hall Effect

devices, IC1 and IC2, mounted in a predetermined position at right angles to each other.  A
cylindrical magnet attached to the wind vane is suspended between them and the Hall Effects each
produce a voltage corresponding to the position of the magnet poles and hence the position of the
vane.  The output of IC1 and IC2 are fed directly to the Microprocessor ports P7.0 and 7.1.

5.4 Compass System

.  The Compass Transducer detects the current bearing and provides the

data for display in both analogue and digital form.

Refer to Drawing Number 

E03789

.  With the exception of component labelling, the Microprocessor

and Reset, Supply and Regulation, NVM and CANBUS circuitry have been previously described
and no further explanation is considered necessary.

The excitation coil of the fluxgate is driven at approximately 20KHz by anti-phase square waves
from microprocessor ports P4.6 and P4.7.  The anti-phase signals are buffered by Transistors TR1
and TR2 to provide the necessary drive.  A reference level of approximately 1.5v is fed to the
fluxgate coils from the junction of Resistors R25 and R26.  The fluxgate coils are set at right angles
and thus effectively provide analogue Sine and Cosine output signals proportional to the currents
induced by the earth’s magnetic field.  These signals are fed to two dual slope integrating analogue
to digital converters IC5 and IC6 via the electronic switch IC7.  The timing of IC7 switching is
controlled by the microprocessor to provide simultaneous precision analogue to digital conversion
of both signals whilst avoiding possible errors caused by multiplexing of the inputs.   The outputs of
the comparators IC5 are fed directly to microprocessor ports P6.5 and P6.6 which provide input
capture facilities.   The heading is calculated by the processor and the data is output via the
CANBUS.

Содержание Simrad IS12

Страница 1: ...1 IS12 INSTRUMENT SYSTEM SERVICE MANUAL ...

Страница 2: ...e Aids 10 TECHNICAL NOTES 2003 Simrad Margate Ltd The technical data information and illustrations contained in this publication were to the best of our knowledge correct at the time of going to print We reserve the right to change specifications equipment installation and maintenance instructions without notice as part of our policy of continuous development and improvement No part of this public...

Страница 3: ...3 IS12 Instrument System Section 1 Introduction ...

Страница 4: ...nsducer display unit and relevant cabling MEGA The Mega Instrument is a multifunction data repeater that can display data from any IS12 master unit in the system or act as an NMEA repeater The unit consists of a display and 5m data cable to enable it to be linked into an existing IS12 system DATA The IS12 Data Unit is a multi line data repeater that can display information from any master unit in ...

Страница 5: ...5 IS12 Instrument System Section 2 Operation ...

Страница 6: ...NSTRUMENTS This Service Manual only contains calibration and operational information for those features of the IS12 System which are not normally available to the end user For details of normal calibration and operation please refer to the appropriate user manual ...

Страница 7: ...7 IS12 Instrument System Section 3 Dis assembly Assembly Instructions ...

Страница 8: ...Socket Collars E03803 and O Rings 190044 will remain with the Case Rear De solder the leads to the Piezo Sounder 160074 to release the PCB Assembly Ensure that the Square Case Seal E03830 is fitted securely into the seal well with the radius side into the well and the flat side facing outwards Solder the Sounder leads into place Ensure that the O Rings are in place in each Sim Net Socket Header Gu...

Страница 9: ...ugh the Cable Grommet E02542 Assembly Locate the Case Seal E03858 into the recess in the Front Case moulding E03876 ensuring that the radius side is towards the case and the flat side is visible Place the Keypad E03819 into position ensuring that the buttons locate correctly into the apertures Fit the Keyboard Shim E03954 over the switches on the PCB and fit the PCB into the front case ensuring th...

Страница 10: ...at each of the corner stand offs and fit the 6 3 x 10 mm Screws 200303 and tighten down Complete a full functional check 3 3 Mast Head Unit Wind Transducer Drawings relating to the masthead unit are shown for information only The masthead unit is a factory calibrated item and only the anemometer and the wind vane can be replaced without recalibration ...

Страница 11: ...ow on the securing flange of the Gimballed Element should be closest to the straight edge of the PCB Terminate the element connections on the PCB Fit the Cable E04042 through the Case Bottom E02781 BK and Grommet E03701 and secure it with a Cable Tie 200026 to provide strain relief Terminate the cable on the PCB Fit the PCB into the Case Bottom E02781 BK the Case Seal E02783 into the recess and br...

Страница 12: ...12 IS12 Instrument System Section 4 Mechanical Assembly Drawings ...

Страница 13: ...ega Square E04156 PCB Assembly Mega E04154 Sht 2 General Assembly Data Square E03896 PCB Assembly Data E03887 Sht 2 General Assembly Wind Square E03897 PCB Assembly Wind E03888 Sht 2 Assembly Case Back E04000 General Assembly Remote Inst Cont E03800 Masthead Cable Connector Cover Assembly E04221 Assembly Top Cap Masthead E04028 Assembly PCBs Masthead E04029 Assembly Masthead Unit E04015 Assembly B...

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Страница 35: ...35 IS12 Instrument System Section 5 Circuit Descriptions ...

Страница 36: ...es Links LK1 to LK3 provide additional pull down options to increase flexibility of board usage e g a Wind Display can easily be converted to a Compass Display by making the solder link LK3 NB Post manufacturing changes to R100 to R106 and R10 to R14 are not recommended due to their location between the PCB and the LCD Supply and Regulation The Display Unit is designed to work from a 12 V source P...

Страница 37: ... to SW4 are directly connected to microcontroller ports P1 0 to P1 3 The lines are normally held high by Resistors R74 to R77 but are pulled to ground when the switch is operated Backlighting The analogue display backlighting configuration utilises LEDs 1 to 4 9 and 14 and 15 and the digital display LEDs 5 to 8 Both configurations are driven by the same circuit Transistors TR13 and 14 under contro...

Страница 38: ...ignals and calculations Integrated Circuit IC9 is a highly stable tone and frequency decoder which generates a constant output tuned to 200KHz adjustable with Variable Resistor VR2 This output at Pin 5 is fed to IC8b c and d where it is gated by the transmitter synchronisation pulse from the processor Port P6 0 at the appropriate pulse width 380µS 1 66mS or 3 32mS The 200KHz pulse switches on TR5 ...

Страница 39: ...net attached to the wind vane is suspended between them and the Hall Effects each produce a voltage corresponding to the position of the magnet poles and hence the position of the vane The output of IC1 and IC2 are fed directly to the Microprocessor ports P7 0 and 7 1 5 4 Compass System The Compass Transducer detects the current bearing and provides the data for display in both analogue and digita...

Страница 40: ...40 IS12 Instrument System Section 6 Circuit Diagrams ...

Страница 41: ...ansducer PCB Circuit Diagram E03789 6 2 Component Lists and Layouts Speed Display PCB Assembly Detail E03884 Sht 1 Depth Display PCB Assembly Detail E03885 Sht 1 Combi Display PCB Assembly Detail E03886 Sht 1 Mega Display PCB Assembly Detail E04154 Sht 1 Data Display PCB Assembly Detail E03887 Sht 1 Wind Display PCB Assembly Detail E03888 Sht 1 Hand Controller PCB Assembly Detail E03723 Masthead M...

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Страница 60: ...Issue 1 0 10 06 03 SIMRAD 60 IS12 Instrument System Section 7 Programming and Configuration ...

Страница 61: ...his Service Manual only contains programming and configuration information for those features of the Instrument System which are not normally available to the end user For details of normal programming and configuration please refer to the appropriate user manual ...

Страница 62: ...Issue 1 0 10 06 03 SIMRAD 62 IS12 Instrument System Section 8 Fault Finding ...

Страница 63: ...Issue 1 0 10 06 03 SIMRAD 63 8 FAULT FINDING 8 1 Common User Faults None Yet Identified 8 2 Common Technical Faults None Yet Identified ...

Страница 64: ...Issue 1 0 10 06 03 SIMRAD 64 IS12 Instrument System Section 9 Spare Parts Detail ...

Страница 65: ...per pack ISPK18 SPR KEYPAD DATA Qty 5 items per pack ISPK19 SPR KEYPAD COMPASS Qty 5 items per pack ISPK20 SPR KEYPAD MEGA Qty 5 items per pack ISPK21 SPR ASSEMBLY CASE BACK ISPK22 SPR REAR LABEL SPEED Restricted availability ISPK23 SPR REAR LABEL DEPTH Restricted availability ISPK24 SPR REAR LABEL COMBI Restricted availability ISPK25 SPR REAR LABEL DATA Restricted availability ISPK26 SPR REAR LAB...

Страница 66: ...Issue 1 0 10 06 03 SIMRAD 66 IS12 Instrument System Section 10 Technical Notes ...

Страница 67: ...Issue 1 0 10 06 03 SIMRAD 67 10 TECHNICAL NOTES None yet issued ...

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