VEHICLE PORTAL MONITOR MODEL VM-250 OPERATING AND SERVICE MANUAL Version 2.
How to use this manual Configuration tracking sheet: Record of system configuration, modifications, upgrades etc. Standard Warranty Table of Contents Section 1: Provides a general description and specifications for the unit. Section 2: Inspection and installation (if required) instructions. Section 3: General operating and programming instructions. Section 4: PC communications Section 5: Hardware theory of operation. Section 6: Calibration and periodic maintenance instructions.
CONFIGURATION TRACKING SHEET TSA MODEL NUMBER:______________ SERIAL NUMBER:________________ SOFTWARE VERSION:______________ DATE RECEIVED:________________ OPTIONS AND ACCESSORIES:_________________________________________ _________________________________________________________________ SYSTEM MODIFICATIONS MODIFICATION:____________________________________________________ _________________________________________________________________ INSTALLED BY:________________________________ DATE:__________ MODIFICATI
STANDARD WARRANTY FOR TSA SYSTEMS INSTRUMENTS TSA Systems, Ltd., warrants this instrument to be free from defects in workmanship and materials for a period of twelve months from the date of shipment, provided that the equipment has been used in a proper manner and not subjected to abuse. At TSA’s option, repairs or replacements will be made on in-warranty instruments without charge at the TSA factory.
VEHICLE PORTAL MONITOR, MODEL VM-250 TABLE OF CONTENTS 1. INTRODUCTION SCOPE AND PURPOSE OF MANUAL ..................................................................1 GENERAL DESCRIPTION......................................................................................1 SPECIFICATIONS....................................................................................................3 OPTIONAL COMPONENTS ...................................................................................4 2.
GLOSSARY ..........................................................................................................................42 APPENDIX A........................................................................................................................43 8. PARTS LISTS SPARE PARTS ORDERING INFORMATION .......................................................47 9. LIST OF DRAWINGS ...................................................................................................
INTRODUCTION ???????????????????????????????????????????? 1. INTRODUCTION 1.1. SCOPE AND PURPOSE OF MANUAL This manual is designed to enable operating and service personnel to properly operate and care for the VM-250. Since applications are necessarily site-specific, operation procedures are given in general terms. Service and repair are covered to the board level. Anything more complex than this requires that the instrument or assembly be returned to TSA. 1.2.
INTRODUCTION ???????????????????????????????????????????? analyzer (model SCA-725) and an infrared occupancy detector. The pillars use lead shadow shielding on the rear and sides of the detectors to reduce the background radiation and increase the ability of the system to detect SNM passing through the portal. User-supplied conduits must be used to provide power, signal, and optionally alarm outputs to external equipment.
INTRODUCTION ???????????????????????????????????????????? 1.3. SPECIFICATIONS Detectors: Two 6" x 30" x 1.5" (15 x 79 x 3.8cm) organic plastic scintillators in each pillar Sensitivity: Exceeds Los Alamos specification #7229 for SNM. For details refer to Los Alamos Publication number LA-10912-MS, dated March 1987, "An Applications Guide to Vehicle SNM Monitors". Power: 12 V 12.
INTRODUCTION ???????????????????????????????????????????? 1.4. OPTIONAL COMPONENTS 1.4.1. Alarm Monitor Model AM-255 The TSA Model AM-255 Alarm Monitor is a self-contained unit designed for use with TSA’s personnel and vehicle portal monitors. The AM-255 provides both remote audible and remote visual alarm indication for radiation level, high and low background, and tamper conditions. In addition, output relays are provided to integrate the AM-255 into existing alarm systems.
INSTALLATION ???????????????????????????????????????????? 2. INSTALLATION The following procedures should allow on-site personnel to correctly install and set up the VM-250 for normal operation. Follow the procedures in the order given. A Checklist is included at the end of section 3. It is recommended that a copy of this be filled out after initial installation and whenever the VM-250 is put into service after prolonged storage.
INSTALLATION ???????????????????????????????????????????? encountered, giving the model and serial numbers of the equipment. TSA will furnish specific shipping instructions. 2.2. SITE SELECTION AND PREPARATION Select a site with enough space to accommodate the detector cabinets. The pillars will need to have an adequate base or some means of stabilization to insure that they remain stationary after alignment. In addition, the system requires 90 - 250 Vac 47 - 63 Hz site power supply. 2.3.
INSTALLATION ???????????????????????????????????????????? 2.4.2. Pillar to pillar interconnections: The pillar interconnections must be connected from the DLT-001 in the master pillar to the DLT-001 in the slave pillar.
INSTALLATION ???????????????????????????????????????????? 2.4.4. Check that the ON/OFF switch on the Load Disconnect is in the OFF position, and connect the battery in the master pillar by connecting the battery cable to the in-line connector from the load disconnect. All of the other cables are factory installed. This completes the internal wiring of the VM-250. At this point the green LED on the Load Disconnect should turn on when the switch is in the ON position.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? 3. SET-UP AND PROGRAMMING 3.1. SET-UP The VM-250 is fully calibrated at the factory. Since these adjustments may be affected during shipment, the calibration should be verified using the Field Calibration Procedures in section 6. The SC-755 is a general purpose controller that is used in several different systems. It has many user programmable parameters that can be used to optimize it for a wide variety of applications.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? password access. This section outlines the menus, a detailed description of the functions immediately follows. Pressing the number associated with the desired operation permits the operator to access that function. Pressing the zero key will display the next page of the current menu, where appropriate.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? 1. The number of 200 ms intervals to "look back" after the system detects occupancy. 2. The number of 200 ms intervals that are used for each alarm comparison. This feature ensures that the front of the approaching vehicle is scanned, and prevents it from affecting the background. The factory setting is 5 intervals (one second), but the optimum setting may vary with local conditions. 3.3.1.3.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? 3.3.2. FUNCTIONS 1. 2. 3. 4. 5. SHOW COUNT: Displays detector counts DSCR. ADJUST: Discriminator adjustment VARIANCE: Performs variance test on all detectors SET CLOCK: Sets system time and date BAUD RATE: Sets baud rate for RS-232 communications 3.3.2.1.SHOW COUNT: Displays detector counts, in cps, updated once per second. All alarms are disabled in the show count mode. Press the pound (#) key to exit the show count mode. 3.3.2.2. DSCR.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? The master and slave discriminators are set independently to permit maximum flexibility in programming the system. In most cases the settings will be the same for both pillars. NOTE: After changing the discriminator settings, always run a variance test to ensure that system noise is not affecting the count data. Two methods of adjustment are provided: 1. Direct entry: Press the zero key from the "ADJUST ULD/LLD" menu.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? Pressing the asterisk (*) key at either the master or slave screen will load the default discriminator settings: LLD = 0.098 and ULD = 5.040. 3.3.2.3. VARIANCE: Performs a variance test on all detectors. The SC-755 runs 15 second variance passes. In the VM-250 system, TSA recommends running five, 15 second passes. After five passes all variance readings should be less than 0.15.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? 3.3.3. ADVANCED 1. 2. 3. 4. 5. 6. 7. ALGORITHM BKG TIME SHOW VERSION CLEAR CNTS F-ALARM TEST BKG.NSIGMA SYSTEM ID 3.3.3.1. ALGORITHM: Permits the operator to select which detectors will be included in the alarm calculations. This allows the operator to optimize system operation for the local conditions. When this mode is selected, the selections will be presented on the display one at a time.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? The false alarm routine takes a 30 second background, 60 seconds of occupancies. Each occupancy is for three seconds, after twenty occupancies, the system acquires a new background. The number of occupancies and number of alarms are displayed as the data is collected. The display looks like this: F-ALARM TEST TRIALS= nnnnnn ALARMS= nnnnnn MODE= BKG, OCC, DONE When MODE=DONE, press a <#> to exit the routine and erase the numbers.
SET-UP AND PROGRAMMING ???????????????????????????????????????????? 3.4. INITIAL INSTALLATION CHECKLIST ___ Incoming inspection performed by: __________________________ ___ ___ ___ ___ 90 - 250 Vac 47 - 63 Hz power supply available. Pillars vertical and square to each other. Pillars stabilized. Cabling correctly installed.
PC COMMUNICATIONS ???????????????????????????????????????????? 4. PC COMMUNICATIONS A communications package is shipped with each system. The package requires an IBM/PC compatible computer running Microsoft Windows 95/98 or NT 4. The package allows the operator to examine the system parameters and download data from the nonvolatile RAM. The system will continue to operate normally during PC communications, however communication will be suspended whenever the system is occupied.
PC COMMUNICATIONS ???????????????????????????????????????????? 4.4. ALARM DATA Data for the most recent six alarms, including 15 minutes of background data prior to the alarm is stored and may be viewed graphically. As the cursor is moved along the horizontal axis, current counts for all detectors are shown in the windows below the graph. Any of the detector data may be temporarily removed from the graphical view by clicking on the check boxes on the left side of the display. 4.5.
PC COMMUNICATIONS ???????????????????????????????????????????? The data file is in ASCII text format, and will look something like this: 06/09/95 17:20:51 Power-up 0 0 0 0 0 06/09/95 17:21:51 Avg. Bkg. 3515 861 849 873 932 06/09/95 17:22:51 Avg. Bkg.
THEORY OF OPERATION ???????????????????????????????????????????? 5. THEORY OF OPERATION 5.1. OVERVIEW The portal monitor makes its decisions for radiation alarms in the following manner. A level for n*sigma is selected using the keypad. Whenever the occupancy detector senses that a the monitor is occupied, the monitor starts making alarm comparisons based on the parameters that have been stored in the controller’s NVRAM (FAST COUNT mode).
THEORY OF OPERATION ???????????????????????????????????????????? occupancy detector has cleared (look after). The amount of time selected for this parameter is based on the estimated speed of passage and pillar spacing. 5.2. MODES 5.2.1. SELF-TEST MODE When the instrument is turned on, it performs a Power-On Self Test (POST).
THEORY OF OPERATION ???????????????????????????????????????????? DET X:LO/HI NNNN, where X is the detector number, and NNNN is the current background for that detector. It will also light the amber fault light on the control pillar, and the appropriate alarm lamp on a remote alarm console, if one is included in the system. 5.2.3.
THEORY OF OPERATION ???????????????????????????????????????????? 5.2.4. VARIANCE ANALYZER MODE In this mode, the unit takes 75 0.2 second background counts and performs a variance calculation on the data. A more detailed description of the variance test may be found in appendix A. 5.3. COMPONENTS 5.3.1. The SC-755 is installed in the master pillar. It is made up of the following components: 5.3.1.1.
THEORY OF OPERATION ???????????????????????????????????????????? customer’s security systems. 5.3.1.4. The DLT-001 is a Differential Line Transmitter/receiver to permit noise immune data transfer between the two pillars. The discriminator control signals are transmitted to the slave pillar, and the SCA outputs are received from the slave pillar. There is also a provision to convert an RS-232 signal to RS-422 compatible levels.
THEORY OF OPERATION ???????????????????????????????????????????? The SCA output is sent to U3, where the digital pulses are timed using the 4MHz clock oscillator. The outputs of U3 are passed on to U4, which drives an opto-isolator in the master pillar. Discriminator adjustment is accomplished using a four-channel, serial input, DAC (U5). The DAC output is set by the SC-755 each time the system is powered up, and whenever a new discriminator setting is entered. 5.3.2.3.
THEORY OF OPERATION ???????????????????????????????????????????? 5.3.8. Optional Alarm Monitor - If an alarm monitor, such as the TSA Systems AM-255, is being used in the system, it will indicate radiation, high and low alarms, but will not give a readout of radiation level. The tamper alarm is a signal that either the door of the pillar has been opened, or the load disconnect senses a low dc power condition.
MAINTENANCE ???????????????????????????????????????????? 6. MAINTENANCE Once initial installation has been completed, little maintenance is required. Periodic inspection is recommended to insure proper functioning. This should include (but is not limited to): - visual inspection for loose wires, etc. field calibration checking the settings of the control module running a variance test performing a drive-through test A Performance Verification Checklist is included at the end of this section.
MAINTENANCE ???????????????????????????????????????????? 6.1.1. SC-755 (MASTER PILLAR) All of the calibration adjustments in the master pillar are located in the SC-755 enclosure. To gain access for calibration, release the latches on the pillar door and swing the door open. The SC-755 is located in the center of the pillar. Loosen the four screws located in the corners of the enclosure, the screws are held captive in the lid.
MAINTENANCE ???????????????????????????????????????????? Test point Voltage Description ???????????????????????? TP7 ?12.6 volts Switched battery TP8 +5 ±0.1 volts VCC TP9 -3 to -5 volts negative rail J3-2 Channel 1 LLD setting ±0.015 volts J3-3 Channel 1 ULD setting ±0.030 volts J3-4 Channel 2 LLD setting ±0.015 volts J3-5 Channel 2 ULD setting ±0.030 volts Do not proceed with calibration until these voltages are within tolerance. 6.1.1.2.
MAINTENANCE ???????????????????????????????????????????? Use the high voltage probe to verify that the high voltage is <1,500Vdc, and is stable ±5Vdc. 6.1.1.3. CALIBRATING THE SC-755 (use Drawings 7 & 8) Attach the oscilloscope to the SC-755 board and set as follows: channel 1 probe to TP5 and probe ground to ground. Set the vertical deflection to 1 volt/division, horizontal sweep speed to 0.5 µseconds/division and positive edge triggering.
MAINTENANCE ???????????????????????????????????????????? Using the DVM, verify that the following dc voltages are present before performing a calibration. All readings are referenced to ground, there are numerous ground test points on the board. Test point Voltage Description ???????????????????????? TP9 ?12.6 volts Switched battery TP8 +5 ±0.1 volts VCC TP7 -3 to -5 volts negative rail TP10 5.00 ±0.01 volts Discriminator reference voltage TP3A LLD setting ±0.015 volts TP5A ULD setting ±0.
MAINTENANCE ???????????????????????????????????????????? 6.1.2.3. CALIBRATING THE SCA-725 (use Drawings 14, 15 & 16) Attach the oscilloscope to the SCA-456 board and set as follows: channel 1 probe to TP4A and probe ground to ground. Set the vertical deflection to 1 volt/division, horizontal sweep speed to 0.5 µseconds/division and positive edge triggering. The signal seen should resemble drawing 26 "typical pulse profile". Adjust the trigger level and intensity on the oscilloscope for the best display.
MAINTENANCE ???????????????????????????????????????????? 6.4.
MAINTENANCE page 35 ???????????????????????????????????????????? 6.5. RECOMMENDED SPARE PARTS The list of spare parts given here is based on the following assumptions. One - that the maximum downtime allowable is 2 hours. Two - that a technical background is not needed to perform the repairs. Qty. TSA Stock# Description Mfr.
TROUBLESHOOTING ???????????????????????????????????????????? 7. TROUBLESHOOTING This guide is designed so that on-site personnel can service the VM-250 and effect necessary minor repairs. It covers procedures and parts down to the board level. Any other problems should be referred to factory authorized service personnel. Unauthorized repair voids warranty. When a problem occurs, it is important to isolate the cause as much as possible.
TROUBLESHOOTING ???????????????????????????????????????????? To reinstall the battery charger, reverse the above steps. The detector assemblies can be removed by disconnecting the cabling and unfastening the velcro straps that secure them in place. Handle these with care to avoid damage which could cause light leaks. To replace, set the detector in place and fasten the velcro straps, and connect the cabling.
TROUBLESHOOTING ???????????????????????????????????????????? go on to the next step until the 90 - 250 Vac is present at the J-box. The battery charger is the only assembly that uses the 90 - 250 Vac directly. To test the battery charger, remove the white connector from the load disconnect and measure the voltage on pins 1 and 3 of the connector (pin 1 is + and pin 3 is ground). The voltage should be 13.5 Vdc. If the voltage is low or not present, the battery charger must be replaced.
TROUBLESHOOTING ???????????????????????????????????????????? In this step the wires to the IR detectors and lights are tested. The recommended action to be taken if the test fails is given in brackets [ ]. Remove the top cover from the IR detector and measure pin 2 for +12 volts and pin 4 for ground [Replace wires to the IR detector]. Test the wiring that brings power to the lights and Sonalert.
TROUBLESHOOTING ???????????????????????????????????????????? 7.3. INDIVIDUAL ASSEMBLIES This section deals with the individual assemblies and how to repair them. As stated at the start of this section the steps only go to board level. In the master pillar the detector signals are fed into the SC-755 controller, where they are processed. If an alarm condition is found, the SC-755 activates the lights and Sonalert. The SC-755 receives occupancy input through the IR detectors.
TROUBLESHOOTING ???????????????????????????????????????????? NOTE: if the pulses are not present for any detector, check the trigger level and intensity on the scope. If the pulses are not present, substitute the voltage divider assembly with a known working assembly, or replace the entire detector assembly. The system must be recalibrated after any components are replaced. 7.3.2.
Glossary page 42 ???????????????????????????????????????????? GLOSSARY ADC: Analog to Digital Converter is an integrated circuit that converts an analog signal into a binary number than can be used by the microprocessor. CPS or cps: Counts Per Second High Background Alarm/Fault: The condition that occurs if the counts exceed the programmed high background level. This condition prevents further operation until the problem is corrected. Normally set in cps.
Appendix page 43 ???????????????????????????????????????????? APPENDIX A The following formulas are used in various systems manufactured by TSA Systems, Ltd. They are provided to assist in verifying system operation and to give our customers a better understanding of how the systems operate. This is a general list, but most systems use some of these formulas. ACTIVITY FROM COUNTS Where: Activity = Activity in nCi Eff = Decimal efficiency (i.e. 10% = 0.
Appendix page 44 ???????????????????????????????????????????? N*Sigma Alarm Level Used to calculate the alarm level on instruments using n*sigma alarm algorithm. Most systems that use n*sigma alarm levels operate in counts/second. where: bkg = Background counts Sigma = 1bkg N = N*Sigma value RELIABLE DETECTABLE ACTIVITY (RDA) FORMULA This formula calculates the minimum activity, in disintegrations per minute, that can be reliably detected under a given set of operational conditions.
Appendix page 45 ???????????????????????????????????????????? SIGNAL TO BACKGROUND RATIO The following formula is helpful in determining the optimum discriminator settings. Always perform a variance test at the final setting of the lower-level discriminator to ensure that system noise is not being introduced into the amplifier stage. where: Q = Quality factor S = Net signal (count with source - background) B = Background count Higher values of Q result in better sensitivity.
Appendix page 46 ???????????????????????????????????????????? VARIANCE The variance analyzer mode is used to check whether the counts seen by the controller are actually ffrom the proper distribution. If the distribution approaches normal, the resulting number will approach 0. Any significant deviation from the normal distribution will result in a larger number. The two most common problems resulting in variance failure are light leaks in the detectors, and periodic noise in the electronics.
PARTS LISTS page 47 ???????????????????????????????????????????? SPARE PARTS ORDERING INFORMATION To facilitate the processing of spare parts orders the following information is required. Product Number Product Serial Number TSA Stock number Part description (from parts list) When ordering programmed proms, the software version is required. This can be found on the prom label. NOTE: Model number suffixes are generally not included in the text of the manual.
PARTS LISTS page 48 ???????????????????????????????????????????? 9. LIST OF DRAWINGS Description Drawing Typical Installation .......................................................................................1 System Wiring Diagram ...............................................................................2 Master Pillar, Front View .............................................................................3 Slave Pillar, Front View .............................................................
