Loma IQ2 Service Manual
  1. Manuals
  2. Brands
  3. Loma Manuals
  4. Metal Detector
  5. IQ2
  6. Service manual

Loma IQ2 Service Manual

Hide thumbs Also See for IQ2:
Table of Contents

Advertisement

Quick Links

Loma Systems
2
LOMA IQ
Service Manual
Search Head and Controls
Contents
Open Flash Memory Programming Supplement
(only if present)
Amendment Record
on page 2
2
Loma IQ
Service Manual
Part No 814119, Issue Level K 19/02/03

Advertisement

Table of Contents
loading

Related Manuals for Loma IQ2

Summary of Contents for Loma IQ2

  • Page 1 Loma Systems LOMA IQ Service Manual Search Head and Controls Contents Open Flash Memory Programming Supplement (only if present) Amendment Record on page 2 Loma IQ Service Manual Part No 814119, Issue Level K 19/02/03...
  • Page 2 Loma Gmbh new address added. Flash Note on fitting a boot eprom added. 7026 Serial link 16-way chassis connector wiring amended to suit the new IQ2 serial link loom assembly. 7026 New IQ2 serial link loom assembly part number added.
  • Page 3 Loma Systems Module Amendment Issue 7026 Dual frequency & Auxiliary (Aux.) relay menu positions added 7026 Catalogue freefall & ferrous in foil coil gaps added 7026 Details of new trend type tracker added 8023 Dual frequency information aded 9095 Dual frequency balance & phase integrity checks added...
  • Page 4 The Loma Group Companies & Service Centres Cautionary Advice Product Description & Environment Fault and Error Diagnosis Configuration & Setup Maintenance Functional Testing Wiring/Connection Diagrams Spare Parts Lists Service Returns Form...
  • Page 5 Loma Systems Limited, Southwood, Farnborough, Hampshire, GU14 0NY, England Telephone: 01252 893300 Fax: 01252 513322 E-mail: sales@loma.co.uk CANADA Loma Canada Limited, 333 Wyecroft Road, Unit 2, Oakville, Ontario, Canada L6K 2H2. Telephone: 1-800-387-7987 / 905-842-4581 Fax: 905-842-3460 E-mail: lomacanada@loma.com NETHERLANDS Loma Systems BV, Panovenweg 22, 5708 HR, Helmond, Netherlands.
  • Page 6 Loma International Inc., 283 East Lies Road, Carol Stream, Illinois 60188, USA. Telephone: 1-800-USA-LOMA / 1-630-588-0900 Fax: 1-630-588-1396 CANADA Loma Canada Limited, 333 Wyecroft Road, Unit 2, Oakville, Ontario, Canada L6K 2H2 Telephone: 1-800-387-7987 / 905- 842-4581 Fax: 905-842-3460 REST OF WORLD Loma Customer Services Dept., Unit 43 Campus Road, Bradford, West Yorkshire...
  • Page 7 Cautionary Advice CAUTIONARY ADVICE CONTENTS Safety Warnings ........................Lethal Hazard Electrical Supplies ..................Working on Equipment ......................Lifting Equipment ........................Moving a Search Head ......................Using a Crane ......................... Using a Fork Lift Truck ......................Dealing with Fire........................Module 4004...
  • Page 8 Cautionary Advice Safety Warnings Listed below are safety warnings that are used throughout this manual. It is strongly recommended that personnel who are, or will be, responsible for maintaining or operating the equipment described in this manual should read and understand these warnings. LETHAL HAZARD –...
  • Page 9 Dealing With Fire In the unlikely event of fire occurring in an item of equipment manufactured by Loma Engineering, it is important that a fire extinguisher containing the correct type of extinguishing material is used. Fire on electrical equipment must be extinguished using a dry powder extinguisher (Blue in the United Kingdom).
  • Page 10 Product Description and Environment PRODUCT DESCRIPTION AND ENVIRONMENT CONTENTS Search Head and Control Unit Technical Specification ............Electrical Supplies........................Spurious Triggering ........................ EMC Interference ........................Radio Frequency Interference ....................Module 5092...
  • Page 11 Product Description and Environment Search Head and Control Unit This section describes Loma IQ metal detector search head and control unit. Technical Specification Search Head ......................Loma IQ Case Material ................. Stainless steel 304L, fabricated Case Finish ......................Bead blasted Environmental Protection .................Dust and waterproof...
  • Page 12 User Manual. Spurious Triggering The Loma range of Metal Detectors is the product of many years' experience and development. They are inherently reliable. Provided a detector is set up as described in the setting up procedure, it is unlikely that any problem lies within the head assembly or control unit.
  • Page 13 Particles of metal under the skid plate. EMC Interference All Loma equipment has been designed to operate under factory conditions, and has been tested to recognised international standards for Electro Magnetic Compatibility (EMC). However, if your equipment is affected by unexplained false rejections that cannot be accounted for by any of the suggestions listed under Spurious Triggering, the equipment may be affected by excessive electrical noise via its supply or airborne (radiated) sources.
  • Page 14 Product Description and Environment Other EMC Considerations Any external sensor connected to the Metal Detector should be in screened cable, grounded at the point of entry into the metal detector control box and kept free from sources of electrical noise (e.g. mains supplies for large electrical machines).
  • Page 15 Product Description and Environment All Loma metal detectors are designed, and tested, to meet the requirements of the FCC and the new stringent European regulations for RF emissions. Both in terms of not emitting excessive or being unduly affected by emissions from other equipment...
  • Page 16 Fault and Error Diagnosis FAULT AND ERROR DIAGNOSIS CONTENTS Cold Start ..........................Run Errors ..........................System Faults ......................... Diagnostic Errors ........................LomaLink Diagnostic Errors ....................Module 6022...
  • Page 17 Fault and Error Diagnosis Cold start Other than that initiated by the use of JP6 on the control board, will not normally occur under normal operating conditions. However, there may be circumstances such as a faulty power supply or a noisy main supply that may cause the control unit to lose its memory.
  • Page 18 Fault and Error Diagnosis Run Errors Are classified as non-fatal but requires an operator's attention. When an error is generated the attention relay operates and subsequently any remote device connected ! ! ! ! to it. In addition the Run Error LED on the User Interface illuminates.
  • Page 19 Fault and Error Diagnosis System Faults Are classified as fatal and require immediate action. When an error is generated the fault relay operates, permanently operating the reject device and/or stopping the " " " " conveyor transport. In addition the Fault Relay LED on the User Interface illuminates.
  • Page 20 Fault and Error Diagnosis Message Cause Solution Bin full The reject bin full sensor has If the bin is not full: detected that the bin is full. 1. Check the Bin full sensor is working correctly. 2. Check the Bin full sensor is wired in the correct sense.
  • Page 21 Loma menu "Diagnostics" "View diagnostics?". The date & time accompany errors. The errors generated can be useful to Loma Service Engineer in the event of an intermittent problem. Do not erase the Log.
  • Page 22 Fault and Error Diagnosis Message Cause Actions Unkn dataset req The detector has received a 1. Check the controlling request for an unknown data set. device for reported errors. Unkn dataset chg The detector has received a 1. Check the controlling change message for an unknown device for reported errors.

  • Page 23: Table Of Contents

    Step by Step Configuration ....................Variable Speed Systems ...................... Calculating CTB Constant ....................Head Power (control lines) ....................Belt Speed ..........................PEC Length Calculation....................... Loma Menu..........................Machine Details Menu......................Serial Links ........................... Remote Sensor Board ......................Reports/Logs Package Upgrade ..................Menu Definitions ........................

  • Page 24: Service Menu Map

    +Not detecting+ System config report? * Reject time * Reject relay * Baud rate * Language * Dbug system LOMA USE ONLY * Manual setup * Reject timing * Data bits * Type * Dbug mask LOMA USE ONLY * Access ferrite...

  • Page 25: User Interface

    Configuration and Set up Information USER INTERFACE Graphics based display LOMA IQ +Not detecting+ " Σ Σ Σ Σ # # # # ! ! ! ! " " " " Main Menu Keys Symbol Function Change product number # # # #...

  • Page 26: Step By Step Configuration

    There are circumstances where it may be necessary for the end user to carry out the commissioning procedure for the control unit. Typically, this would occur when LOMA do not have enough information about the end application, such as the belt speed or reject details, too fully configure the machine. There are, in addition, other instances such as performing a software update, moving the detector to a different application, replacing a control card, etc.
  • Page 27 Configuration and Set up Information Step One If the unit is not already at the top of the Configuration menu, displaying the +Not detecting+ warning message, go to this menu now by following this key sequence: Press the [ ] key once. Press the [ ] key until the display shows “Service”.
  • Page 28 Configuration and Set up Information PHARM: Used with pharmaceutical detector. CONVEYOR: Driven transport system. Units: Select METRIC or IMPERIAL as preferred. Photo eye: Select YES if a product registration photo eye located prior to the detector has been wired to the control board. Coil gap: Enter the Coil Gap as shown on the machine details plate (inside control box), or by reference to Table 1.
  • Page 29 Configuration and Set up Information Table of Tolerance settings available: Menu position % of calibrated threshold added 15 % of calibrated threshold. 25 % of calibrated threshold. 50 % of calibrated threshold. 75 % of calibrated threshold. 100 % of calibrated threshold. AUTOCAL: Select the desired auto-calibration period: Photo Eye...
  • Page 30 Configuration and Set up Information Tracker: Turning this facility on allows the user to select the tracker option for each of the products as required. See Tracker for more information about the benefits of the tracker page 34 facility, and how it can be used. This option is only available if a photo eye is fitted.
  • Page 31 Configuration and Set up Information Step Four Move to the Reject options menu and set up the detector as required for your application. Reject options are listed in the Definitions section of this on page 39 chapter. Press the [ ] key once to exit the Reject options menu.
  • Page 32 Serial link configuration section of this chapter. page 28 Step Six For detectors using IQ2v1.1 software and above go to the Loma menu and follow the ADC Setup menu on page 22 Exit the Service menu by pressing the [ ] key four times.

  • Page 33: Variable Speed Systems

    On systems employing variable speed conveyors, special hardware is required to drive the CTB (Conveyor Time Base) input on the micro control card. Conveyor systems supplied by LOMA will already have this hardware fitted and commissioned, but on head only sales the following information should be observed when using variable speed.
  • Page 34 Configuration and Set up Information CTB Constant: This parameter is the number of pulses (ticks) per metre/foot of belt travel. To calculate this figure for entry into the “*CTB constant” menu position, use either the metric or imperial formula following: Metric systems: CTB = Encoder pulses per revolution x 1000 π...

  • Page 35: Head Power (Control Lines)

    Configuration and Set up Information Variable Speed Errors Because the detector can only work within a pre-determined speed range it is possible for the belt speed to move outside the limit of reliable operation of the machine. In these cases, speed-logging problems can be selected in the configuration menu that will generate either speed too slow or speed too fast run errors.

  • Page 36: Belt Speed

    Configuration and Set up Information CONTROL LINE FUNCTIONALITY OUT = +8V reference to 0V IN + 0V reference to 0V Following is a table detailing control line function and effect. Control line Function and effect Ctrl 1 Switches a resistor directly across the receiver search head amplifier. highest Reduces both product signal and metal contaminant signal regardless of mode resistor...
  • Page 37 Configuration and Set up Information “Configuration menu”. The values range from 150 KΩ up to 1.5MΩ. The detector will not allow a speed to be entered that is outside the range allowed by the selected filter resistor value. Driven systems generally are detectors which are mounted on conveyor systems, however if the product is pumped and the speed at which it is pumped is known e.g.
  • Page 38 Configuration and Set up Information FILTER RESISTOR VALUE vs SPEED THROUGH THE APERTURE for FIXED and VARIABLE SPEEDS The table shows the standard range of smallest aperture dimensions. The dimensions are shown in millimetres. To convert to inches divide by 25.4 and round to the nearest whole inch. The speed is shown in metres per minute.
  • Page 39 Configuration and Set up Information FILTER RESISTOR VALUE Vs SPEED THROUGH THE APERTURE for PIPELINE The table shows the standard range of detector apertures. The dimensions are shown in millimetres. To convert to inches divide by 25.4 and round to nearest whole inch. The speed is shown in metres per minute.
  • Page 40 Configuration and Set up Information FILTER RESISTOR VALUE Vs SPEED THROUGH THE APERTURE for 6000/7000 SLIMLINE COMBO The speed ranges available are the same for each of the standard aperture heights. Shaded and bolded values are only available on 6000 style Combos. The dimensions are shown in millimetres.
  • Page 41 Configuration and Set up Information FILTER RESISTOR VALUE Vs SPEED THROUGH THE APERTURE for FREEFALL & PHARMACEUTICAL The table shows the standard range of detectors apertures. The dimensions are shown in millimetres. To convert to inches divide by 25.4 and round to nearest whole inch.
  • Page 42 Configuration and Set up Information PEC (PHOTO ELECTRIC CELL or PHOTO EYE) LENGTH The detector can be configured to work with or without a product registration PEC. If a PEC is fitted, it can be mounted across the product flow or above the product flow in the case of product whose height is very small.

  • Page 43: Loma Menu

    This will only appear if the reports/logs package is in fitted. The report contains the set up information for the detector. * Dbug system BBAL Loma use only and contains no useful user information. * Dbug mask Loma use only and contains no useful user information.
  • Page 44 Configuration and Set up Information IQ2V1.1 and upwards software " " " " ADC setup menu Pressing ] to access the ADC setup menu for the devices fitted. " " " " ADC type Displays the device type fitted. Press ] to view the live R channel signal.
  • Page 45 Configuration and Set up Information • Monitor the R channels signal, the numbers will be continually moving. Observe the numbers and their sign to determine if the average movement is symmetrical about 0 or if it is biased in a negative or positive direction. If the direction is biased one way try to estimate the symmetrical point of that bias.

  • Page 46: Machine Details Menu

    Configuration and Set up Information MACHINE DETAILS MENU The following list details the individual menu positions sitting below the “Machine details menu” and their use. " " " " Machine details Press ] to access the menu options following. * Machine This menu position allows you to enter the serial number of the detector found on the serial number label located inside the control cabinet.

  • Page 47: Serial Links

    If the link is used to drive LomaLink then reference to the Serial Communications Handbook Loma is required to enable the correct interface protocol to be written. This can be emailed to you upon request. Link selection, 20mA configuration settings and JP2 header and detector...
  • Page 48 Configuration and Set up Information Most printers have a parallel interface as standard, which is not compatible, the chosen printer must have an optional RS232 serial interface supporting hardware handshaking fitted. RS422 for devices no more than 1000 metres (1093 yards) from the detector.
  • Page 49 Configuration and Set up Information SERIAL LINK SELECTION Communications selection links Link JP4 RXD JP1 TXD JP5 Power RS232 RS422 20mA Figure 8 Communications selection details 20mA Link Detector Active LK1 TX LK2 RX 20mA Link Detector Passive LK1 TX LK2 RX Figure 9 20mA Configuration setting details JP2 Header...
  • Page 50 Configuration and Set up Information Serial link menu configuration The serial link menu protocol for link 1 is configured as follows: " " " " Link 1 may be set to one of the following options. Press ] to select the usage list then again and use the [ ] to select one of the uses below.
  • Page 51 LK2 see figure 9 for link information Figure 11 Serial Link Board Loma Part Number 416245 Fitting the Board The board locates into connector JP1 and supported by 2 pillars the board will only locate one way round. Refer to...
  • Page 52 In order to make a connection to an external device your detector control box will require the fitting of a serial link loom assembly Loma part number 516517. The loom connects between the 14 way header plug found on the serial link board, with the 16 way external connector located in the second from right gland hole when facing the control box.

  • Page 53: Remote Sensor Board

    32 Sensor connections TBA1 Terminal 1 Figure 13 Remote Sensor Board Loma Part Number 416244 Optional External Sensor Connection Ladder Diagram for this on page 2 board can be found in the Wiring/Connections section of this manual. TBA1...

  • Page 54: Reports/Logs Package Upgrade

    33 this section. To enable the reports/logs option an additional component is required Loma part number 411210. The device fits into a socket U4 located on the control board. Before fitting the reports/logs option integrated circuit ensure the legs of the chip are straight and correctly formed to ensure positive location into its base.
  • Page 55 Configuration and Set up Information The fitting and connection of the serial link board can be found in the "Configuration and Set up" section of this manual, the serial link protocol set up can be found in the "Serial link Configuration" on page 28 Main control board...

  • Page 56: Menu Definitions

    Configuration and Set up Information MENU DEFINITIONS User options Tracker The following explanation applies only to software version 1.4 and below. Enables two working thresholds to be set. The working threshold selection is automatic and is used for frozen product that is subject to slight thawing effects. Tracking limit (V1.4 &...
  • Page 57 Configuration and Set up Information Reject out of run Turn this to ON if no product is to be allowed down the line without being checked for metal. This has the effect that it will not be possible to disable the reject mechanism via the disable reject menu and in addition, provided a photo eye is fitted to the system, that product will be rejected during a full calibration cycle.
  • Page 58 NOTE Wherever possible, LOMA will have set the entries within this menu to those required by your application before the dispatch of your system, or during a commissioning visit by a Loma engineer as applicable.
  • Page 59 Configuration and Set up Information You should check that the detector will detect the minimum contaminant sizes for your company QA specification, under all production conditions, when the detector is working with this threshold value. Lower thrsh This menu entry allows the lower threshold limit to be set. This value should be set as low as possible, so that when product is running with low product signals no false rejects occur.
  • Page 60 Configuration and Set up Information Operating conditions: The Tracking limits menu is only available if Tracker has been set to ON in the User options menu. For this option to be available, a photo-eye must be fitted for product registration purposes. Tracking is product relative, i.e.
  • Page 61 Configuration and Set up Information Reject options Pulse: When a contaminated package is detected the reject delay time is counted down, in order for the package to travel from the photo eye to the reject device, where upon the reject is turned on for a time equal to the reject dwell time. Typically, this mode of reject would be used for air blast or pusher type rejects for the accurate rejection of small packages at high speed.
  • Page 62 NOTES: Wherever possible the necessary settings will be selected before the unit is dispatched by LOMA. Specific hardware requirements are needed for some of the options to be operational, such as bin full detection. Module 7026...

  • Page 63: Principles Of Operation

    Configuration and Set up Information PRINCIPLES OF OPERATION Inside the metal detector an electromagnetic field is used, operating at a similar frequency to that used in AM broadcasting, through which the product passes. This field interacts with both the product and any metal contamination within it, in such a way that the interaction is measured to determine whether or not the product is contaminated.
  • Page 64 Configuration and Set up Information Oscillator Figure 2 Coil arrangement in search head Spaced equally on each side of the transmitter are two "receiver" coils. These coils act as aerials to pick up the magnetic field, so that a large voltage can be measured across the coils.
  • Page 65 Configuration and Set up Information Resistive and Reactive Components The search head produces two signals, known as the resistive and reactive signals (R and X), that tell the control unit about the interaction of the product with the magnetic field. In general terms, dry products only produce a small reactive signal, whereas wet or fresh products such as cheese produce mainly resistive signals.
  • Page 66 Configuration and Set up Information Figure 4 Locus plot of X against R for the block of cheese Product Compensation These so called locus plots can give us a valuable understanding of how the metal detector works, and how it must be set up for optimum performance in different applications.
  • Page 67 Configuration and Set up Information Cheese + 2mm Fe Cheese Figure 6 Shows how the cheese locus is “swung round” and made bigger by the 2mm ferrous contamination If we consider Figure 6, this shows the locus plot for a block of cheese with and without the 2mm ferrous contamination.
  • Page 68 Configuration and Set up Information Cheese 2mm Fe Threshold Cheese Figure 7 Locus plot after compensation applied The compensation and threshold values are automatically set by the detector, during a calibration cycle, but can be altered manually if so desired. The top menu position on the display shows the product signal level against the threshold.
  • Page 69 Configuration and Set up Information Dry operation is preferred wherever possible, because this minimises the effects of vibration on the detector - see below. In the event that during a calibration cycle the unit detects that the product has significant product effect, i.e. it is not dry, then a suitable mode of working (Reactive or Resistive) and compensation value is derived to compensate out the product effect.
  • Page 70 Face on, however, the same small piece may give an enormous signal. To overcome these problems Loma offer differently constructed units, such as cross field and twin angled systems, where necessary.
  • Page 71 Maintenance MAINTENANCE CONTENTS Cautionary and General Advice .................... Display Board Replacement ....................Keyboard Overlay Replacement ..................Control & PSU Board Replacement ..................Filter Resistor Pack ....................... Hardware Cold Starting ......................Control Board Links and Test Points .................. Power Supply ........................Connecting to a Power Source ..................

  • Page 72: Cautionary And General Advice

    Maintenance CAUTIONARY & GENERAL ADVICE WARNING The control box electronics use devices that are sensitive to static discharge. Incorrect handling of any of the boards or individual components could cause permanent damage. General Advice Following are a few simple precautions and general information items that should be read prior to performing any maintenance functions.
  • Page 73 Maintenance Antistatic wrist strap. Proprietary integrated circuit chip leg preparation tool. Thin stiff cardboard (for wet silicon removal). Torque wrench with 10mm socket set to 4 Newton metres (3 pounds/feet). Control Box The control box is supplied “specific to usage” and may be remote from the search head.

  • Page 74: Display Board Replacement

    Maintenance Keyboard Overlay Removal & Refitting If the overlay requires replacing then the overlay and display board can be removed as follows: NOTE The watertight seal between the keypad and the control box face is very strong. Care must be taken whilst attempting to break the seal. Excess force may damage the control box causing a potentially poor seal between the new keypad and control box.
  • Page 75 Maintenance Display board Control Item 1 Ribbon cable tie-wrapped in 2 places no requirement to remove Item 2 Overlay These items form part of the overlay Apply approximately 5mm clear silicon rubber in a continuous bead, around the centre line of the overlay fixing holes before fitting...
  • Page 76 Maintenance Boot eprom required for flash Display board connector memory programming and use of Reports/logs package the engineers panel diagnosis J1 Programme plug JP6 & 7 Filter resistor pack Watchdog LED Head board connector PL1 Relay LED's TP8 & 9 Optional serial link board JP10...
  • Page 77 Maintenance Control & PSU Board Removal & Refitting WARNINGS Read carefully before commencing any work. LETHAL HAZARD - The control board and power supply are combined on a single board that contains high AC/DC voltages. A grounded mesh screen cover protects the power supply area of the main control board.

  • Page 78: Filter Resistor Pack

    Maintenance Undo and remove the 10 M3 pillars that secure the control board into the control box. Ensure all removed fixings are retained. Carefully remove the board. Replacing the control board with your new board is the reverse of its removal. The new board will come pre-programmed with the current revision of operating software only.

  • Page 79: Control Board Links And Test Points

    Maintenance Switch off the detector power. Fit link 1-2 on JP6. Switch on the detector power. The display will show + Not detecting + Power down. Remove the link. Power up. Re-configure the detector menus. If the link is not removed then a warning message + Warning JP6 + will be displayed and exit from the “Configuration”...

  • Page 80: Power Supply

    T2A Loma part number 517033 If the power supply requires replacement follow the instructions for replacing the control board.
  • Page 81 If it is desired to attempt a replacement then the later re-settable fuse type should be used. Loma part number 517104. Later issue control & psu boards are fitted with the re-settable fuse as standard located as above.
  • Page 82 Maintenance Relay Contact Information Connections are made depending upon detector application, refer to your customised wiring diagrams in your User Manual supplied with the detector. Contacts are shown are for relays when de-energised (failsafe). Pin1 Reject relay 2 contact sets Fault relay 2 contact sets Error relay Run relay...
  • Page 83 Maintenance Power cabling must be rated at no less than 5A current carrying capability and be routed into the control box by a suitable watertight gland. The power input gland hole is on the extreme left of the control box when facing the controls. Access to the ac input connections is as access to the incoming ac protection fuse &...

  • Page 84: End Plate Removal And Refitting

    Maintenance END PLATE REMOVAL AND REFITTING The end plate located on the search head case is designed to be removable to allow access to the electronic boards located inside. There are no user replaceable parts inside, however if the plate is removed then the following instructions should be followed.
  • Page 85 Maintenance Figure 5 End Plate Item Number Quantity & Description Part Number Comments M6 X 25 hex head bolts 108068 Quantity is end plate size dependent Nylon shoulder washer 116036 Quantity is end plate size dependent M6 X 20 hex head bolts 108064 Quantity is end plate size dependent...
  • Page 86 There are also two power rails that will need to be checked and adjusted as required. If Loma has provided the board for a specific serial numbered detector then some of these components may already be correctly fitted.
  • Page 87 Maintenance item 6 Item 2 Item 3 Item 1 item 5 Item 4 Item 4 Non Metallic Mounting Wings Figure 7 Search Headboard Mounting Parts List Item Quantity & Description Part Comments Number Number 2 off 1/4” x No. 4 pan head self tapping screw 122011 122011 1 off used to secure P clip...
  • Page 88 Maintenance Sig gnd (signal ground) Green Tx output (Transmitter) Red (twisted) Tx gnd (Transmitter Blue (twisted) ground) RF input (Receiver input) Red (screened) RF gnd (Receiver ground) Blue (screened) Figure 8 Search Headboard Connection Details The search headboard can be replaced as follows: A general component layout diagram is given in Figure 6 and a diagram of the board fixing is given...
  • Page 89 Maintenance • Check the values of resistors RD1, 2 & 3. The values are 4.7KΩ 220Ω & 2.2KΩ respectively as standard, but the values on the old board may have been changed to accommodate an excessive product signal. If they have been changed then copy the changes to the new board.
  • Page 90 Maintenance 1 ORANGE 2 GREY 3 PINK 4 TURQUOISE 5 BLACK 6 BROWN 7 WHITE 8 RED 9 BLUE 10 VIOLET 11 YELLOW 12 GREEN Figure 10 Control Board Termination PL5 RECEIVER INTERFACE BOARD Located behind the removable end plate of your detector search head case is a receiver interface board.

  • Page 91: Dual Frequency Detectors

    Maintenance DUAL FREQUENCY DETECTORS A dual frequency detector is capable of operating at two different frequencies that are selectable from within the Product setup menu Frequency menu position. Selection is on a per memory basis giving the flexibility to change operating frequency upon a change of product.
  • Page 93 Functional Testing FUNCTIONAL TESTING CONTENTS Recommended Test Equipment ................... Balance ........................... Reactive and Resistive Channels ..................Phase Integrity and Channel Noise ..................OSGO ............................DC Power Rails ........................Module 9095...
  • Page 94 Functional Testing RECOMMENDED TEST EQUIPMENT Dual Beam Oscilloscope, 100 MHz bandwidth minimum. x1 probe 3.5 Digit - Digital Multimeter (DMM). Static safe wrist strap Plastic trim tool Penlight/flashlight WARNING Before commencing any test work ensure that you are wearing a correctly grounded wrist strap.
  • Page 95 Functional Testing JP9 link TP11 Earthing pillar Figure 1 Exploded View of JP9, TP11 and Earthing Pillar 6. Adjust the oscilloscope time base until a sine wave can be seen and the volts per centimetre to a setting of 50 mV. 7.
  • Page 96 Functional Testing REACTIVE AND RESISTIVE “X” & “R” CHANNELS Your detector converts the change in balance caused by either product or metal into two distinct signals called Reactive and Resistive signals, this technique is known as phase detection. The correct setting of these channels can be quite simply checked by the user, however in the unlikely event of the settings being incorrect there is no user adjustment available.
  • Page 97 Functional Testing Earthing pillar Figure 3 Exploded View of TP8 & 9 and Earthing Pillar 1. Adjust the oscilloscope time base until the white noise is clearly visible and the volts per division to 100mV. 2. The channel noise level should be less than 500mV peak to peak. 3.
  • Page 98 Functional Testing Your detector continuously monitors the presence of this important signal via a circuit called OScillator GOing. The AC signal is converted to a DC signal that can be found on pin 11 “yellow wire” on PL1. If this voltage falls below 1V then a “System fault” is generated, that causes the “Fault Relay”...
  • Page 99 Functional Testing DC POWER SUPPLY RAILS The continuous monitoring of the basic DC power rails required to operate your detector is another function of the fault monitoring circuits. In the unlikely event of any of the primary +12V, -12V analogue (AN) or +5V digital (DIG) rails go out of specification a “System fault”...
  • Page 100 Wiring Diagrams WIRING/CONNECTION DIAGRAMS CONTENTS Figure 1 Optional External Sensor Connection Ladder Diagram ........Module 10088...
  • Page 102 Spare Parts SPARE PARTS CONTENTS Spare Parts Lists ........................Module 11050...
  • Page 103 Spare Parts Suggested Holding of Major Items Spare Parts List Part Identification Part Suggeted Comments Number Holding Display Board Assembly includes 419205 1 per site Can be split to enable Keyboard Overlay replacement of either the display or overlay Control & PSU Board with Reports & 416265 1 per site approved...
  • Page 104 Service Return SERVICE RETURNS FORMS CONTENTS Instructions ..........................Form ............................Module 12005...
  • Page 105 Service Return INSTRUCTIONS For goods to be returned to Loma, the user must complete the Returns Form. Please photocopy the laminated form. Please ensure that the following is entered on the form: Company Name Date Description of the goods being returned Reason for return - please provide a reasonable description of the fault condition.
  • Page 106 Service Return RETURN FORM Customer: Date. Serial No. Description of Item: Description of Fault: Authorisation Number North America only Module 12005 10-3...

Table of Contents