ALARM MONITOR MODEL AM-255 OPERATING AND SERVICE MANUAL Version 1.
AM-255 TABLE OF CONTENTS 1. INTRODUCTION..................................................................................................................... 1 1.1. SCOPE AND PURPOSE OF MANUAL.................................................................... 1 1.2. GENERAL DESCRIPTION ....................................................................................... 1 1.3. SAFETY PRECAUTIONS ......................................................................................... 1 1.4.
APPENDIX .................................................................................................................................. 19 A. WARRANTY .......................................................................................................................... 19 B. GLOSSARY ............................................................................................................................ 20 C. FORMULAS ...............................................................................
1. INTRODUCTION page 1 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 AM-255. 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.
1. INTRODUCTION page 2 1.4. SPECIFICATIONS Display: 4 alarm indicator LEDs per pillar being monitored; One systems ready LED, one power on LED Power: Internal: 12 volt, 7Ah sealed lead-acid battery pack Relay Power: Maximum 0.
2. INSPECTION AND SET-UP page 3 2. INSPECTION AND SETUP The following procedures should allow on-site personnel to correctly install and set up the AM-255 for normal operation. Follow the procedures in the order given. It is recommended that a copy of the Initial Installation Set-Up Checklist (section 2.4.). be filled out after initial installation and whenever the AM-255 is put into service after prolonged storage.
2. INSPECTION AND SET-UP page 4 2.1.4. Shipping: Before returning the instrument for any reason, notify TSA Systems of the difficulty encountered, giving the model and serial numbers of the equipment. TSA will furnish specific shipping instructions. 2.2. SET-UP PROCEDURES An Initial Setup Checklist is included at the end of this section. It is recommended that a copy of this be filled out when the AM-255 is first installed, and whenever it is put into service after prolonged storage.
2. INSPECTION AND SET-UP page 5 2.2.3. Connect the Positive Battery Cable: The positive battery cable is disconnected for shipping, and must be connected to the positive battery terminal. 2.2.4. Power: Plug the power cord into a standard 90 to 250Vac outlet. 2.2.5. Toggle Power Switch: There is a toggle power switch on the circuit board. This switch must be turned on (away from the connector edge of the board).
2. INSPECTION AND SET-UP page 6 Connect the wires to the appropriate connections on the terminal strips. The following tables outline the connections.
2.
2. INSPECTION AND SET-UP page 8 2.4.
3. OPERATING INSTRUCTIONS page 9 3. OPERATING INSTRUCTIONS 3.1. CONTROLS AND INDICATORS The controls and indicators can be made to operate in several different ways. How they operate is controlled by the software installed. The front panel contains the power LED, ready LED, alarm indicator LEDs, and the acknowledge switch. The power LED is on whenever the system has power. The ready LED shows that the system is clear of alarms and working properly.
3. OPERATING INSTRUCTIONS page 10 Acknowledge: This is a momentary contact pushbutton switch which clears the audio and visual indication of alarm conditions. Key Switch: The key switch is used to clear alarm lamps or test relays during maintenance. Test: A momentary contact pushbutton switch used to test the lamps, LEDs, and Relays. Sonalert: The Sonalert provides audible alarm. 3.2.
3. OPERATING INSTRUCTIONS page 11 3.3. OPERATION During normal operation no operator intervention is needed. If an alarm condition is indicated, the AM-255 will sound an audible alarm and the panel lamps will indicate the nature of the alarm so that proper action may be taken. Pressing the test button will cause all the alarm lamps to flash, the ready LED to illuminate and the audio alarm to sound. If the key switch is in the normal position, it will energize the relays.
4. THEORY OF OPERATION page 12 4. THEORY OF OPERATION The alarm monitor model AM-255 is a battery powered, remote monitor unit used with TSA’s pedestrian and vehicle portal monitors. The AM-255 provides both audible and visual alarm indications for radiation alarms, low and high background alarms, and tamper conditions. Parallel relay outputs are provided to permit interfacing with existing alarm systems.
4. THEORY OF OPERATION page 13 4.2. COMPONENTS 4.2.1. AM-255 Board: The AM-255 Board is the controller board for the system. It receives information from the system, and enables the appropriate lamps, relays, and the Sonalert. All functions of the AM-255 board are controlled by a Programmable Logic Device. There is also a battery monitoring circuit on the board. If the battery voltage drops below 10.5 Vdc the load disconnect will turn off the system power. When the battery voltage rises to 12.
5. MAINTENANCE page 14 5. MAINTENANCE 5.1. MAINTENANCE PROCEDURES The AM-255 has been designed for continuous use, and 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): - checking the alarm lamps and Sonalert with the TEST switch - performing an alarm test, High, Radiation, Low, Tamper - visual inspection for loose cables, wires, etc.
5. MAINTENANCE page 15 5.2.
6. TROUBLESHOOTING page 16 6. TROUBLESHOOTING This guide is designed so that on-site personnel can service the AM-255 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 repairs are completed and the unit returned to operation, a copy of the Performance Verification Checklist (section 5.2.) should be filled out and filed for future reference. 6.
6. TROUBLESHOOTING page 17 6.1.3. Battery Charger: The Battery Charger is wired directly into Molex connector to the AM-255 board. To disconnect, the Molex pins must be removed from the housing by inserting a small screwdriver or sharp pointed object into the slots in the housing and pressing down, while pulling gently on the wire. The ac input plugs into the charger with a standard IEC connector.
6. TROUBLESHOOTING page 18 To check the charger, disconnect the positive terminal from the battery and J1 from the AM-255 circuit board. Measure the voltage from between the black and red battery wires. It should be at least 13.5 volts. If it is not then the charger must be replaced. NOTE: Do not go on to the next step until the charger is working correctly. Battery voltage must be at least 12.5 Vdc for the unit to turn on. 6.3.
APPENDIX A. WARRANTY page19 APPENDIX A. WARRANTY 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.
APPENDIX B. GLOSSARY page20 B. GLOSSARY ADC: Analog to Digital Converter, is an integrated circuit that converts an analog signal into a binary number that 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 B. GLOSSARY page21 Rolling Background: This is the background accumulation method used in most of TSA’s instruments. Background accumulation is done in ten separate buffers, each buffer represents 1/10 of the total background time. As each buffer is filled, the background is updated. This results in a background update at background time/10. Initial background accumulation requires the full background time.
APPENDIX C. FORMULAS page22 C. FORMULAS 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 C.1. ACTIVITY FROM COUNTS Activity = Activity in nCi Eff = Decimal efficiency (i.e. 10% = 0.1.) Where: N = Net counts per second (cps – background cps) C.2.
APPENDIX C. FORMULAS page23 C.4. 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. BKG = total background counts per count time CON = confidence sigma CT = count time in seconds E = system efficiency in percent F = false alarm level in cps FA = false alarm sigma G = intermediate variance RDA = reliable detectable activity in DPM C.5.
APPENDIX C. FORMULAS page24 C.6. VARIANCE The variance analyzer mode is used to check whether the counts seen by the controller are actually from 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.
APPENDIX D. CONFIGURATION TRACKING SHEET page25 D.
APPENDIX E. PARTS LISTS page26 E. PARTS E.1. RECOMMENDED SPARE PARTS A complete list of spare parts is available by contacting TSA Systems, Ltd. E.2. 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 included with the instrument) When ordering programmed proms, the software version is required. This can be found on the prom label.
APPENDIX F. DRAWINGS page27 F. DRAWINGS Please reference the drawings package provided with the instrument to view the following: AM-255 Pictorial View ................................................................................................................. 1 AM-255 Pictorial View ................................................................................................................. 2 AM-255 Controller Board ...............................................................................
