Service Manual GMX X-Ray Generator

Transcription

1 Service Manual GMX X-Ray Generator CMR X-Ray, LLC 2000 Pewaukee Road, Suite H Waukesha, Wisconsin Copyright CMR X-Ray, March 2015

2 GMX X-RAY GENERATOR SERVICE MANUAL CONTENTS 1) PRE- INSTALLATION Introduction Dimensions, Weight and Cable Access Environmental Requirements Packaging Electrical Requirements, 208 to 480 Volt Lines Electrical Requirements, Power Assist Units Safety Devices ) INSTALLATION Introduction Tools and Materials Measurement Equipment Pre- Installation Check Unpacking Power Cabinet Installation / power assist Operator Console Installation Interface Connections Generator Connections Left side Generator connections right side T1 Voltage Taps, Rotor and Filament X- Ray Tube Stator Connections DiGital Interface, 2TS Relay Board, Bucky Interface, 2TS System Connect, 2TS T1 Power Module AUX Power T1 Taps (Rotor & Filament) and Fuses TS- 1-1 Power assist transformer input i Copyright CMR X-Ray, 2015

3 3) GENERATOR CONFIGURATION Configuration procedure ) CALIBRATION TRUE- TRACK Calibration with Computer Typical ma and kv Wave Forms ) TROUBLESHOOTING Introduction Service RECOMMENDATIONs Error Codes ERROR Code Descriptions ) RENEWAL PARTS Power Module LINE Inverter ) ACCEPTANCE TESTING Introduction Preliminary Testing X- Ray Time Measurement kv/ma X- Ray Measurement Linearity Repeatability SUPPLEMENT B POWER ASSIST SUPPLEMENT C USEFUL TABLES SUPPLEMENT D HV CABLE MAINTENANCE ii

4 1) PRE-INSTALLATION 1.1 INTRODUCTION Planning and preparing the customer site. This list contains the main topics to consider during pre-installation planning: Equipment dimensions Installation and sizing of the electrical supply Installation of safety devices, Door Interlocks, X-Ray On-Lamps, Disconnect Circuit Breakers, etc. 1.2 DIMENSIONS, WEIGHT AND CABLE ACCESS POWER MODULE DIMENSIONS: FRONT 23 SIDE 24 HEIGTH 19.5 WEIGHT 178 lbs. (Illustrated W/O covers) 1

5 BASIC RAD CONSOLE DIMENSIONS: FRONT SIDE 9.75 HEIGTH 4.5 WEIGHT 4.75 lbs. POWER ASSIST DIMENSIONS: FRONT 23 SIDE 24 HEIGTH 10.0 WEIGHT 98 lbs. (Illustrated W/O covers) 1.1 GENERATOR COMPONENTS 2

6 1.3 ENVIRONMENTAL REQUIREMENTS Temperature: 10ºC to 40ºC (50 F to 104 F). Relative Humidity 0 to 90%. Maximum Altitude: 2440 meters (8000 feet) above sea level. Note: This X-Ray Generator will dissipate 544 btu/hr. 1.4 PACKAGING 1.7 SHIPPING CRATE 3

7 1.5 ELECTRICAL REQUIREMENTS, 208 TO 480 VOLT LINES Model Power Supply Voltage Frequency (Hz) GMX 325 RAD 30 kw 208/220, 1Ø 50/60 GMX 525 RAD 50 kw 220, 3Ø 50/60 GMX 625 RAD 60 kw 380, 3Ø 50/60 GMX 825 RAD 80 kw 480, 3Ø 50/ LINE VOLTAGES Power and Ground Wire Size (AWG): Model Power Ground Power Ground Power Ground Power Ground Power Ground Power Ground 0 to 30m 31 to 50m 51 to 70m 71 to 90m 91 to 110m 111 to 130m GMX 325 RAD 1/0 6 1/0 6 2/0 2 3/0 2 4/0 1/0 250 MCM 1/0 GMX 525 RAD 1/0 6 1/0 6 2/0 2 3/0 2 4/0 1/0 250 MCM 1/0 GMX 625 RAD 2 6 1/0 6 2/0 2 3/0 2 4/0 1/0 250 MCM 1/0 GMX 825 RAD 2 8 1/0 6 2/0 2 3/0 2 4/0 1/0 250 MCM 1/ POWER AND GROUND WIRE SIZING 4

8 electrical requirements continued. Line Disconnect to Power Module Model Power Ground 0 to 10m GMX 325 RAD 2AWG 2AWG GMX 525 RAD 2AWG 2AWG GMX 625 RAD 2AWG 6AWG GMX 825 RAD 2AWG 6AWG 1.4 WIRE SIZING, TO POWER MODULE Model Power Transformer Capacity (kva) Main Disconnect Switch GMX 325 RAD 40, 1Ø 100 Amp GMX 525 RAD 50, 3Ø 100 Amp GMX 625 RAD 65, 3Ø 100 Amp GMX 825 RAD 80, 3Ø 100 Amp 1.5 WIRE SIZING TOLINE TRANSFORMER Note : Line voltage variations must not exceed ± 10% from nominal voltage. Note : Line voltage drop during X-Ray exposures must not exceed 10%. 5

9 1.6 ELECTRICAL REQUIREMENTS, POWER ASSIST UNITS Power assist Generators require 115 VAC, 20 Amps, supplied from a standard wall outlet or 220VAC, 30 Amp. The Power assist Line Voltage is configured by taping its input transformer (located in the Power Assist Chassis) to the appropriate Line Voltage. See page 22, this manual. 1.7 SAFETY DEVICES Door safety switch: Prevents X-Ray exposures when the room door is open. Check local requirements. X-Ray On lamp: Installed outside the X-Ray suite, (typically above the room door). Check local requirements. Note: The GMX X-Ray Generator provides a switching function to activate the X-Ray On Lamp, the lamp voltage is supplied by the customer. Note: The GMX X-Ray Generator is not configured to supply any voltage or currents that may be required to interface other ancillary devices that may be installed with the X-Ray generator. Grounding and or load issues to the GMX circuits may result in faulty operation and function during X-Ray generation. 6

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11 2) INSTALLATION 2.1 INTRODUCTION This chapter describes procedures used to install the GMX X-Ray Generator. The installation process will depend on Generator type and ancillary equipment configuration: Check for transportation damage. Report shipping damage to the Freight Company or CMR X-Ray. Check that supplied components and cables match what was ordered system. NOTE: Power Assist Generator installation is covered in Appendix PA 2.2 TOOLS AND MATERIALS Required tools and materials: Hand tools. (Service Engineers Tool Kit) Terminal Crimp Tool (Wire sizes 12 through 22) Power Drill Motor, Drill Bit Index Rotary Hammer, Concrete Bits Extension cord. Soldering iron, 60 Watts. Silicone Insulating Grease DC4 Vapor Proofing Compound or Equivalent. Degreasing/Cleaning agent. Dielectric Oil. 8

12 2.3 MEASUREMENT EQUIPMENT Fluke 177 or equivalent digital multimeter. Tektronix TDS 2002 or equivalent oscilloscope. mas meter. KVP Meter Dose Meter 2.4 PRE-INSTALLATION CHECK Prior to installation, inspect the site and verify that the X-Ray room complies with Preinstallation requirements: Incoming Line, voltage and current capacity. Main Switch and Safety Devices. Conduit, size and location. Space Requirements. Note: Refer to Pre-Installation Chapter (1) 2.5 UNPACKING TWO PEOPLE ARE REQUIRED FOR MOVEMENT AND PLACEMENT OF THE HV TRANSFORMER AND POWER MODULE and/or POWER ASSIST. IT S HEAVY, DON T RISK AN INJURY! During the equipment unpacking, inspect all items for visible damage. After unpacking, verify the following: All items on the customer order are present. All hardware and internal wiring is secure. 9

13 2.6 POWER CABINET INSTALLATION / POWER ASSIST TWO PEOPLE ARE REQUIRED FOR MOVEMENT AND PLACEMENT OF THE HV TRANSFORMER AND POWER MODULE and/or POWER ASSIST. IT S HEAVY, DON T RISK AN INJURY! Power Cabinet Installation: 1. After unpacking, remove Power Module trim covers. 2. Remove the shipping screws that attach the Power Module to the pallet. Place the Power Module chassis near to its final position in the room. Two people are required for this operation. 3. Do not install HV Transformer wires, HV cables and covers until instructed to do so in this Manual. 4. Power Cabinet may be freestanding or located on a platform or shelf or bolted to the room floor. NOTE: Local requirements apply. 2.7 OPERATOR CONSOLE INSTALLATION 1. Place the Operator Console at its final location. 2. Connect provided interconnect cable, the other end will terminate at the Power Module. 10

14 2.8 INTERFACE CONNECTIONS The following drawings show the connections between the generator and peripherals, ie.: Table Bucky, Wall Bucky, Safety Lamp, Door Switch, etc GENERATOR CONNECTIONS LEFT SIDE 2TS1 Rotor AUX Voltages See pp 14 2TS2 Digital Interface 2TS3 Relay Board, Bucky Interface See pp 17 2TS4 System Connect Jumper 4 and 10 to enable Service Mode See pp 18 11

15 2.8.2 GENERATOR CONNECTIONS RIGHT SIDE 1TS1 Pre Charge Functions & ON/OFF Functions MAKE NO CHANGES F6, F7 ON/OFF 1TS2 T1 Primary Tap 1TS3 Rotor Start & Run Taps Filament Inverter Volts Tap FUSE F8, 15A Pre Charge F9, 15A T1 F10, 15A RTR Start F11, 15A RTR Run F12, 15A Filament F14, 15A Filament 12

16 2.8.3 T1 VOLTAGE TAPS, ROTOR AND FILAMENT GMX X-RAY GENERATOR 2TS1-1 1F10* A , J1-3 1F11* A , J1-1 1F12* 1F13* A , J1-8 Fluoro Only 1F14* A , J1-1 1F15* Fluoro Only Stator Common Tap for Rotor Start Voltage Tap for Rotor Run Voltage Tap for Filament Inverter Voltage * All Fuses are 15A / 250 VAC 1TS V BLK 40V BRN 60V RED 100V ORN 130V YEL 220V BLU 310V WHT 270V GRY 0V VIO T1 220V RED 208V BRN 0V BLK 1TS

17 2.8.4 X-RAY TUBE STATOR CONNECTIONS 2TS1 X-Ray Tube 1 Common WHT 2 Phase Shift RED or GRN 3 Main BLK 4 Housing Ground 5 Thermo Switch t o 6 Thermo Switch RTN Tie Point (Open) 7 Tie Point (Open) 8 AUX +24, < 500mA 9 AUX +24 Common 10 Will not support more than 500 ma Load *2C1 Phase Shift Capacitor Value as/per X-Ray Tube Stator 2C1* 0 VAC 1TS3 ** Chassis Ground added by installer ** 2TS1 X-Ray Tube/ Stator Interface Low Speed Rotor Control A J3 1 3 Closes at Power UP NO Contact: UL Rating: 5 A at 30 VDC 5 A at 125 VAC Wall Bucky Suppl Cable. Generator Descriptio 14 Table

18 Varian Color Black Red White Orange-Brown Brown-Orange Green-Yellow Description Main Auxiliary Common Thermal switch Thermal switch Ground TOSHIBA Color Black Red White Yellow Blue Green-Yellow Description Main Auxiliary Common Thermal switch Thermal switch Ground KAILLONG Color Black Red White Blue Blue Green-Yellow Description Main Auxiliary Common Thermal switch Thermal switch Ground 15

19 2.8.5 DIGITAL INTERFACE, 2TS2 2TS2 Digital Interface Used for Software based interfaces 16

20 LED1 LED2 LED3 LED4 LED5 K1 D1 K2 D2 K3 D3 K4 D4 K5 D5 R1 R2 R3 R4 R5 K1C K1B K2C K2B K3C K3B K4C K4B K5C K5B P1 P3 P4 P6 P7 P9 P10 P12 P13 P15 P5 P8 P2 P11 P CMD Return Bucky 1 Start CMD Bucky 2 Start CMD Spare 1 Start CMD Spare 2 Start CMD Room Light Room Light Return EXP Start CMD EXP Start Return Tie Point (Open) A Ancillary Interface Board J V Bucky 1 Bucky 2 Bucky 3 Bucky 4 Room Light Bucky/Tomo EXP 2TS3 TS1 Tie Point (Open) GMX X-RAY GENERATOR RELAY BOARD, BUCKY INTERFACE, 2TS3 Tie Point (Open) 17

21 2.8.7 SYSTEM CONNECT, 2TS4 127 VAC and 2TS4 2 Descriptio 1 Tie Point (Open) Tie Point (Open) Tie Point (Open) *SERVICE MODE Spare Interlock **DOOR OPEN *** X-Ray Tube Thermo Switch Tie Point (Open) GND GND *Jumper to GND for Service Mode ** Must be LOW for EXP Through Door Switch or Jumper to GND *** Must be LOW for EXP Connects to Tube at 2TS1-5 2TS4 A System Connect 18

22 2.8.8T1 POWER MODULE AUX POWER 19

23 2.8.9 T1 TAPS (ROTOR & FILAMENT) AND FUSES GMX X-RAY GENERATOR 2TS1-1 1F10* A , J1-3 1F11* A , J1-1 1F12* A , J1-8 1F13* Fluoro Only 1F14* A , J1-1 1F15* Fluoro Only Stator Common Tap for Rotor Start Voltage Tap for Rotor Run Voltage Tap for Filament Inverter Voltage * All Fuses are 15A / 250 VAC 1TS V BLK 40V BRN 60V RED 100V ORN 130V YEL 220V BLU 310V WHT 270V GRY 0V VIO T1 220V RED 208V BRN 0V BLK 1TS

24 TS-1-1 POWER ASSIST TRANSFORMER INPUT GMX X-RAY GENERATOR Generator Descriptio 21

25 3) GENERATOR CONFIGURATION The following procedure describes the initial configuration for the GMX X-Ray Generator. Generator calibration follows in chapter 4. In order to successfully complete configuration and calibration you must observe the following: Required Hardware / Software: Computer, Laptop Windows 7 or higher Service Interface Box, CMR part Number G , with USB cable. Service Software (A4000-xx), CMR CD provided. Software Driver, USB to UART bridge (silicon labs CP 2102 USB to UART); available at Silicone Labs website : (also available on the CD provided with the CMR X-Ray Generator). 3.1 CONFIGURATION PROCEDURE 1. Verify that the Mains Power breaker is Off; Generators with Power Assist (PA) verify that the PA power cord is disconnected. 3. Connect the USB cable between your laptop computer and the Service Interface Box. 4. Connect the Generator to Operator Console cable (DB-15), from the Power Module front panel to the Service Interface Box. 5. Place a jumper between 2TS4-4 and 2TS4-10 on the A board located in the power module (see page 11 and page 18 in this manual).. 22

26 Turn the Mains wall breaker On, or connect the Power Assist unit to outlet power. Turn the Generator On with the ON switch located on the Service Interface Box. Close the toggle switch on the PA unit. 7. Insert the installation CD or flash drive into your PC. 8. Open Folder A v4, in that Folder find Folder Software, copy and paste Software to C Drive Open A v4 found on the installation disk or flash drive 11. Double click setup.exe, follow instructions, this will install the generator calibration program ion c:\program Files (x86)\a On your PC, Click Windows Start 13. Click on Control Panel 14. Click on Device Manager 12. Select Ports (COM & LPT), this will indicate which COM Port connects to the X-Ray Generator. Note and remember this number. If you don t see a comport that is connected to the generator via the service box then you don t have the UART bridge driver installed. Most of the time your computer will search for this driver and find it on the supplied CD. However if that does not work you must go online to the silicone labs website, this will allow your computer to download and install the correct USB two UART driver. This operation is extremely critical to the successful and functional application of the configuration and calibration features of this generator. 23

27 12 COM Port # 13. Run program A v4, accessible fron Windows Start or Program Files (x86)\a Or create a shortcut from Program Files 24

28 15. The next screen should look like this. Select the ON button. GMX X-RAY GENERATOR 14, ON 16. You will see this window displayed for approximately 10 seconds 25

29 17. Next, the Main screen will display. Note: Status box reflecting possible problems or errors. Note: that various selections located at the bottom of this window.. Select Configuration button. 11, Configuration 26

30 18. In configuration mode, the following screen is visible. System ID and System Ratings cannot be changed. 100 Amp Line Power is default it when 1 Tube Rad is selected Rather than defining and repeating the selections on this screen, you as the installer should be able to configure and select the various functions presented. If you have trouble recognizing these choices you may want to enlist a more experienced service engineer to help (call a friend). The selection of the correct X-Ray Tube Type is extremely important. 20, Close 18, SAVE 19. Once configuration selections have been made use the Save button to move these settings into Generator memory. 27

31 20. During Configuration Save you will see this screen 21. After saving the configuration settings, Select Close,, the software will return to the Main screen. NOTE: If you are not moving to Calibration Mode, remove the Service enable jumper on 2TS4 (see page 11 in this manual). If you are proceeding to the Calibration Mode, select ma Calibration,continue as follows. 20, ma Calibration 28

32 4) CALIBRATION 4.1 TRUE-TRACK CALIBRATION WITH COMPUTER TRUE-TRACK insures that X-Ray parameters calibrate to required specifications. If you have just finished Configuration, connect your scope and start at step # 6, this chapter. If you are checking Calibration only, install the software and setup as per Chapter 3.1 (pp 22 this manual), steps The following procedure will ensure compliance. Connect scope Channel 1 to TP12 (ma test point) on the PWM A board, Set Amplitude: 500mV per division Set.Time 5ms per division. Use channel 1 trigger in normal mode. Connect scope Channel 2 to TP3 (kv test point) on the PWM A board, Set Amplitude: 1V per division. PULSE WIDTH MODULATOR A TEST POINTS TP3, kv Test Point, Chanel 1 TP12, ma Test Point, Chanel 2 TP 23, kv and ma signal common 29

33 1. Connect the USB cable between your laptop and the SERVICE BOX, connect the Generator cable to the SERVICE BOX. 2. Place a jumper between 2TS4-4 and 2TS4-10 on the A board located in the power module (see page 11 in this manual) Install the.exe file found in the A folder. This software is compatible with Windows XP and Windows Turn the Mains breaker On 5. Turn the Generator On with the ON switch located on the OPERATOR CONSOLE SIMULATOR BOX 6. From the Main screen, access Calibration mode. 7, Calibration 30

34 7. Calibration screen. Note the Status window, if any of these are highlighted you will not be able to make an exposure. Repair or reconfigure as needed to satisfy all parameters in the Status window. 16, Status Window 8, Closed Loop. True-Track NOTE: When True Track is selected the software will default to the starting technique setting, 80 kv, 10 ma, at 40 ms 8. Insure that Closed Loop and True-Track are selected. 9. To start (10 ma at 80 kv) make sure that the Filament Demand set point is at least 2200 but not greater than 2400 (for most x-ray tubes). Note: Filament Demand Limit and starting Set Point are set relative to the X-Ray Tube selected during Configuration. 31

35 10. With a Hand switch connected to the service box make an exposure, the Filament Demand number will change. 11. Continue to hold exposure switch, X-Ray exposures will automatically continue, until a green highlight annotated with Calibration successful appears 12. Release the Expose and Prep switch, Note the WAIT indication in the STATUS Box, You must wait for the indicator to change to Ready to expose before continuing with the next ma Calibration. True-Track automatically saves the data and advances to the next station. 13. Continue to initiate the exposure switch until the next station is calibrated. 14. Repeat until all ma stations are calibrated. 15. A green indication of Cal complete will present when each station is calibrated. 12, WAIT Will Change to Ready to expose 16, OFF 10, Filament Demand 11, 15, Green 16. When all ma stations are Calibrated, Select OFF. 32

36 Note: to recalibrate a specific ma station select the MA value and select 80 kva, initiate the calibration process, after the 45 kva station is calibrated you must manually select the 125 kv station and then initiate the Cal process. 4.2 TYPICAL MA AND KV WAVE FORMS 80 kv 10 ma 80 kv 100 ma 80 kv 300 ma 33

37 You have just installed the Medical Imaging industry s most cost effective High Performance High Frequency X-Ray Generator. Thanks for your wise choice. 34

38 5) TROUBLESHOOTING 5.1 INTRODUCTION The generator includes self-diagnostic routines to facilitate troubleshooting. When in the unlikely event there is an error, the Operator console displays an error code. This chapter lists the errors, with corresponding corrective actions. 5.2 SERVICE RECOMMENDATIONS CAUTION: This X-Ray Generator has components that maybe damaged by electrostatic discharges (ESD). Use ESD precautions when working with the printed circuit boards. WARNING THE HIGH VOLTAGE INVERTER CAPACITORS RETAIN A LARGE PORTION OF CHARGE FOR APPROXIMATELY 2 MINUTES AFTER THE UNIT IS TURNED OFF. Auto-DISCHARGE CIRCUITS ARE IN PLACE BUT ALWAYS CHECK FOR BUS VOLTAGE WHEN WORKING IN THIS AREA. Do not produce Radiation without cause When making exposures during service activities, be mindful of the expected path of the primary X-ray beam. Keep all parts of your body outside of this path. Exposure to X ray radiation may be harmful, care must be taken to avoid direct exposure to the primary X Ray beam. Always Collimate the x-ray beam to as small an area as possible 35

39 Do not defeat or override any safety features on the GMX X-Ray generator. Note: In the unlikely event of a blown fuse: To insure the continued protection against fire replace uses only with the same type and ratings as supplied and specified by CMR X-Ray. After service, insure that all protective panels and covers are in place. 5.3 ERROR CODES Error codes, provided for troubleshooting. There are two categories (1) recoverable and (2) non-recoverable. A recoverable error prevents exposures until the conditions generating the Fault have been repaired, does not require a Generator restart. A non-recoverable error requires the Generator to be repaired and restarted. For the Basic RAD Console, the lamp of the selected function key will flash. When that key is pressed, the kv indicator displays the error code. To check if more than one error occurred, keep the function key pressed and simultaneously press one of the kv keys. For the Touch Screen Console, Error/Fault Codes display on the Operator Counsel using text, not numbers. 36

40 5.3.1 ERROR CODE DESCRIPTIONS Non-Recoverable Errors, Requires repair and Restart E02 E07 E10 E19 E27 E36 E38 E39 E44 E46 E47 E49 E52 E53 E56 E57 E58 Battery Fault (Battery Systems Only) X-Ray Tube Thermal Switch Fault. Bucky Signal Fault Rotor Signal Fault Communication Fault (Console to Power Module) Inverter Bus Voltage Low IPM Fault Filament Fault Console Pushbuttons activated during Power UP Microprocessor Battery Fault Tube Data Fault ma Station Not Calibrated kv Unbalanced Checksum Error, Flash Memory AEC No Calibration Data High Speed Rotor Fault Microprocessor Not Initialized Recoverable Error, Re-Start Not Required E18 E29 E32 E33 E51 E51 X-Ray Room Door Open Exposure Back Up Time Selected AEC Technique greater than 650 mas Selected Technique Exceeds Available Heat Units Pre-Charge Error Exposure Hand switch released before End of Exposure 37

41 6) RENEWAL PARTS 6.1 POWER MODULE Low Voltage Distribution A Low Voltage Power Supplies ,24,25 IPM Line Fuses Filament Driver A Contactors, Line & Pre Charge Low Speed Rotor Control A HV Transformer Inverter Module (CONT. Next Page) 38

42 Digital I/O A Micro Controller A Analog I/O A Pulse Width Modulator A

43 GMX X-RAY GENERATOR 6.2LINE INVERTER Assembly Number: A , Inverter Module, 1 Phase 240 VAC A , Inverter Module, 3 Phase 240 VAC A , Inverter Module, 3 Phase 480 VAC IPM kw kw kw Snubber Caps MF MF IPM Driver A Input Filter/Charge Monitor A (240V 1P) A (240V 3P) A (480V 3P) Line Rectifiers, (2 or 3 each) (Not Visible) Capacitor, 4 each MF (Not Visible) 240 VAC Fuses (480V 3P Only) Resistor, Pre- Charge E 30 kw E 80 kw Pre-Charge Contactor Line Contactor Line Fuses

44 7) ACCEPTANCE TESTING 7.1 INTRODUCTION This chapter defines the tests used to ensure that the calibrated operation of this equipment meets performance requirements set by the FDA in 21CFR, Sub Chapter J. Make these checks after installation calibration or any maintenance that would affect Generator calibration. 7.2 PRELIMINARY TESTING These procedures confirm the operation and calibration of the generator. 1. Turn the generator ON and note the operator console startup routine. The control console indicators will display the last ma, kv, and time 2. Change the technique factors and verify they are updating relative to operator input. 3. Press the prep pushbutton and make sure the X-Ray tube rotor is turning and the Ready Lamp illuminates. 4. Release the prep pushbutton and make sure the prep lamp turns off and the X-Ray Tube rotor is no longer powered. 41

45 7.3 X-RAY TIME MEASUREMENT Test Equipment Oscilloscope. Method Connect the oscilloscope at test point TP3 (KV test point), on the PWM board. Acceptance Limit Set time Acceptance limit 1ms at 5s +/- (1%+0.1ms) Procedure 1. Make an exposure at 80kV, 100mA, using the exposure times specified in table Measure the exposure time with oscilloscope. 3. Record the measurement information in form 6 Time Measurement (chapter 5, in this manual). The measured results must be within the indicated limits, see table

46 Exposure time (s) Limits (s) Table 6.1 Time Measurements. 43

47 7.8 KV/MA X-RAY MEASUREMENT Test Equipment Non-invasive kv meter. mas meter. Method Connect the kv meter as indicated by the manufacturer. Connect the mas meter to the red and black test terminals located on the high-voltage transformer. Acceptance Limits Factor Acceptance limit kv +/- (5% of kv + 1 kv) ma +/- (5% of ma + 1 ma) Table 6.2 kv and ma Measurements. 44

48 kv/ma Measurement (continued) Procedure 1. Select 50kV, 100ms and the lowest station in the set scale. 2. Make an exposure and record the measured values in Form 7 or Form 8 (Chapter 5, in this manual). 3. Select 80kV, 100ms 4. Make an exposure and record the readings for kv/ma in form 7 or 8, as applicable. 5. Select 120kV, 100ms 6. Make an exposure and record the readings for kv/ma in Form 7 or 8, as applicable. 7. Repeat until you are finished with the ma values and record in Form 7 or 8, as applicable. Note: Observe X-Ray Tube rating limitations during this procedure 45

49 7.8 LINEARITY Test Equipment Dosemeter. Handheld Calculator. mas meter. Aluminum Filter. Method Place the X-ray tube at a focus-film distance of 100cm (40 ). Place the dosemeter in the middle of the radiation field and a distance of 50cm (20 ) from tube focal point. Adjust the collimator as per the size of the radiation area. Place an aluminum filter over the image reception to minimize secondary radiation. Connect the mas meter in the red and black terminals aon the high-voltage transformer. Remove the shorting link located between the red and black terminals. 46

50 Linearity (Continued) Specifications The linearity coefficient (CL) or difference between two radiation averages and the mas obtained for an two consecutive readings of the tube current, must not exceed 0.1 times the sum. That is: CL = ( X 1 X 2) 0.1( X 1 X 2) Where X and values. 1 X are the mr/mas averages obtained from two consecutive tube current 2 Procedure Select 80kV, 200mA, and 100ms. Perform a series of 5 exposures and record them in form 9 Linearity (chapter 5, in this manual). Select 80kV, 250mA y 100ms. Perform a series of 5 exposures and record them in form 9 Linearity (chapter 5, in this manual). Estimate the generator linearity with the data from the table and test its linear behavior. 47

51 7.8 REPEATABILITY Test Equipment Dosemeter. Calculator. Aluminum filter. Method Place the X-ray tube at focus-film distance of 100cm (40 ). Place the dosemeter in the middle of the radiation field and at a 50cm (20 ) distance from tube focal point. Adjust the collimator based on the size of the radiation area. Place an aluminum filter over the image reception to minimize secondary radiation. 48

52 Specifications The radiation coefficient of variability (CV) must not exceed 0.05 for any specific combination of technical factors. That is: CV = s mr Where: CV = Coefficient of variability. s = The simple standard deviation (σ (n-1)) or the square root of the differences and the square of the total of 5 exposures divided by 4(n-1). mr = Is the average doses for 5 exposures. Procedure Select 80kV, 100mA, and 200ms. Perform a series of 5 exposures and record the results in Form 10 Repeatability (Chapter 5, in this manual), for estimating the Repeatability. Repeatability must have a coefficient less than

53 SUPPLEMENT B POWER ASSIST The Optional CMR Power Assist allows CMR X-Ray Generators to operate from 115VAC, 20 Amp outlets. Once installed mimimal Service or Operator interaction is required. Power outages will necessitate the Operator to push the Reset Push Button when power is restored. POWER ASSIST MODULE POWER ASSIST INVERTER, LOCATED IN POWER MODULE 50

54 POWER ASSIST SERVICE SWITCH Located under the front cover of the Power Assist module. When Closed (Down Toggle) the Service Switch, will discharge the capacitor banks. Discharge may take up to 20 minutes, SWITCH, Push to reset PA Module Service Switch SWITCH, UP Position (ON), enables PA function SWITCH, UP Position (ON), enables power to Generator Power Module LAMP, Indicates a Charge on PA Bus LAMP, indicates Reset pushbutton must be activated POWER ASSIST CONTROL PANEL LAMP, Indicates PA Module is connected to power 51

55 SUPPLEMENT C USEFUL TABLES Selected ma Linear Scale Voltage at TP 12, PWM Linear ma Scale I Selected ma Renard Scale Voltage at TP 12, PWM Renard ma Scale Note: See page 11 for Test Point locations Selected KV Voltage at TP 12 PWM

56 SUPPLEMENT D HV CABLE MAINTENANCE If required, remove old insulating grease from cable ends and receptacles. Clean cable ends and receptacles with a hydrocarbon cleaning solvent. Avoid touching the cleaned areas with your hand to avoid leaving perspiration or skin oil on the insulating surfaces. Inspect cable ends and cables for evidence of arching, carbon tracking, burnt or pitted areas, and/cracked conditions. If any of these conditions cannot be cleaned it may be necessary to replace the cable or receptacle. Insure that the cable ends have a rubber sealing-ring and that the rubber ring is correctly positioned and clean. At the HV transformer, insulating oil (Shell Diala X or equivalent) may be used in the HV receptacles to provide insulation and vapor displacement. After cleaning, insert approximately ¼ inch of oil in the receptacle. Insert the cable(s) and tighten the spanner ring. At the X-Ray Tube, apply a fresh layer of insulating grease to the cable ends. Use a wooden or plastic spatula to apply the grease, avoid using fingers. On the side of the cable ends apply a 1 to 2mm layer of grease. At the cable end cover the cable pins with insulating grease. Insert the cable(s) and tighten the spanner ring. NOTE: after the X- Ray Tube has been heated recheck the tightness of the spanner ring; during the thermal cycling of the X-Ray tube the grease has melted and repositioned, causing the cable to loosen 53

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