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118165-001 REV. A

475 Wireless Boulevard • Hauppauge, New York 11788, USA • www.spellmanhv.com • T:+1 631.630.3000 • F:+1 631.435.1620

Predictive Filament Scheme for VMX

3/12/2010

Preheat

mA loop cntrl

Fil fdbk

mA Sampled here

Exposure On

mA fdbk

mA Servo Activated

Ideal response.

Enable HV Output

mA overshoot. This is due to too much Fil Preheat

mA undershoot. This is due to too little Fil Preheat

End of Exposure

Figure 1 Figure showing the time sampling of mA feedback during transition from preheat to mA
servo.

Содержание PMX

Страница 1: ...ction Manual High Voltage Power Supply MODEL SERIAL DATE SPELLMAN HIGH VOLTAGE ELECTRONICS CORPORATION 475 Wireless Blvd Hauppauge New York 11788 1 631 630 3000 FAX 1 631 435 1620 E mail sales spellmanhv com Website www spellmanhv com PMX ...

Страница 2: ... aware of the electrical hazards WARNING note in the text call attention to hazards in operation of these units that could lead to possible injury or death CAUTION notes in the text indicate procedures to be followed to avoid possible damage to equipment Copyright 2000 Spellman High Voltage Electronics Corporation All Rights Reserved This information contained in this publication is derived in par...

Страница 3: ...spannungsnetzteiles benötigen ca 5 Minuten um sich zu entladen Erden Sie sich nicht und arbeiten Sie nicht in feuchter oder nasser Umgebung Notwendige Reparaturen können es erforderlich machen den Gehäusedeckel während des Betriebes zu entfernen Reparaturen dürfen nur von qualifiziertem eingewiesenem Personal ausgeführt werden WARNING im folgenden Text weist auf gefährliche Operationen hin die zu ...

Страница 4: ...de l alimentation Ne vous mettez pas à la masse ou ne travaillez pas sous conditions mouillées ou humides La maintenance peut nécessiter l enlèvement du couvercle lorsque l alimentation est encore allumée Les réparations doivent être effectuées par une personne qualifiée et connaissant les risques électriques Dans le manuel les notes marquées WARNING attire l attention sur les risques lors de la m...

Страница 5: ...carica della capacità interna dell alimentatore ad alta tensione Non mettere a terra il proprio corpo oppure operare in ambienti bagnati o saturi d umidità SICUREZZA NELLA MANUTENZIONE Manutenzione potrebbe essere richiesta rimuovendo la copertura con apparecchio acceso La manutenzione deve essere svolta da personale qualificato coscio dei rischi elettrici Attenzione alle AVVERTENZE contenute nel ...

Страница 6: ...LOCK CONNECTIONS 14 2 8 TUBE CURRENT MONITOR CONNECTION 14 2 9 GROUND CONNECTION 14 2 9 1 X Ray Tube Housing Ground 14 2 9 2 Chassis Ground 15 2 10 FINAL CHECKS 15 2 11 GUI SOFTWARE 15 CHAPTER 3 17 INTERFACING 17 3 2 MULTI INTERFACE 17 3 2 1 Connector Style and Pin Layout 17 3 2 2 Serial Communication Interface 18 3 2 3 Digital I O Control Interface 19 3 2 4 Remote Status Interface 20 3 2 5 Remote...

Страница 7: ... 5kW peak high voltage output coupled with a dual focal spot DC current source filament power supply provides stable and accurate X Ray tube emission currents The solid encapsulated high voltage output section eliminates oil concerns while reducing effects of environmental humidity and contamination PMX s flexible interfacing and controlling capabilities as well as powerful application features re...

Страница 8: ...INE VOLTAGE LEVEL THE CURRENT REQUIREMENTS AND THE LENGTH OF THE CABLE RUN AND MUST BE CONFIRMED BY THE INSTALLER ALL THE RATINGS LISTED CONSIDER THE GENERATOR REQUIREMENTS ONLY THE INSTALLER MUST MAKE THE NECESSARY COMPENSATION FOR ADDITIONAL LOAD REQUIREMENTS A POOR QUALITY INPUT LINE MAY RESULT IN THE INSTALLER HAVING TO DERATE THE GENERATOR S MAXIMUM POWER Mains Voltage Minimum Recommended Mai...

Страница 9: ...ilter is connected to an off line auxiliary power inverter circuit that provides 24V power for generating other auxiliary supply DC voltages 1 2 3 Inverter The inverter is a half bridge topology Current mode control is used for driving the inverter An IGBT power module employed The IGBT provides high frequency switching to control the primary current flow to the high voltage transformer Circuits o...

Страница 10: ...vers provide system Fault Control Indication User interface is processed on this PWB as well providing isolated relay coils opto couplers and open collector contacts 1 2 7 Filament Power Supply The filament inverter provides the power to drive the filament winding of the X Ray tube The filament inverter is a high frequency series resonant inverter The inverter provides high frequency ac current to...

Страница 11: ... of boost steps consisting of different frequencies and increased voltage during the boost cycle to increase the acceleration of the anode rotation to operating speed within several seconds Following the boost cycle the applied voltage is reduced to proper voltage to maintain rotation There are two operating modes for the anode rotor low speed 60Hz stator voltage and high speed 180Hz stator voltag...

Страница 12: ...NLESS SAFE EXPOSURE FACTORS AND OPERATING INSTRUCTIONS ARE OBSERVED The following advisory symbols are used on the safety warning labels and or on circuit boards High voltage symbol used to indicate the presence of high voltage Warning symbol used to indicate a potential hazard to operators service personnel or to the equipment ...

Страница 13: ...ARP TOOLS MAY DAMAGE THE CONTENTS 3 Set aside the cardboard packaging 4 After unpacking inspect for visible damage 5 Keep the shipping containers In case of shipping damage place the unit s back in its shipping pack and notify the carrier and the Customer Support Department as indicated in this manual 2 3 OVERALL CONNECTIONS NOTE THIS IS BASIC CONNECTION ILLUSTRATION FOR TESTING MORE COMPLEX AND D...

Страница 14: ...PMX MANUAL 9 118164 001 REV A Figure 2 1 PMX I O and indicator locations ...

Страница 15: ...provide fuses or circuit breaker protection on the input power lines to limit fault current that may occur due to component failure or operator error Fuses or circuit breakers with current rating of 35 Amps are recommended Refer to Chapter 1 for generator power and generator power line requirements 1 Check the input voltage rating on the nameplate of the supply and make certain that this is the ra...

Страница 16: ...l 2 Connect wires from the X Ray tube housing low voltage connector stator pins to PMX terminal block TB2 terminals 1 stator PHASE 2 stator RUN 3 stator COM and 4 GROUND 3 Connect tube thermal switch wires to TB3 5 and TB3 6 if present If not short the two pins Normally there are no such separate wires for MAMMO tubes it is always integrated into the three phase line Refer to tube housing data she...

Страница 17: ...GND Generator signal ground for reference of interface circuits JB1 2 5VDC Out 5 volts DC from generator for use in powering interface circuitry such as optocouplers 100mA maximum JB1 3 RS232 Tx Out RS232 Transmit out from generator JB1 4 RS232 Rx In RS232 Receive in to generator JB1 5 PREP User Signal Contact Closure to alert the generator that exposure sequence will begin Once this signal is act...

Страница 18: ...istor output Low Active Fault JB1 15 Status Bit 1 3 bit status lines for up to 6 status messages See separate matrix Table 2 4 describing functionality Open Collector transistor output Low Active Message JB1 16 Status Bit 2 JB1 17 Status Bit 3 JB1 18 N C N C JB1 19 N C N C JB1 20 kV Monitor Signal from generator 0 10V 0 50kV Zout 1K ohm JB1 21 Emission Monitor Signal from generator 0 10V 0 200mA Z...

Страница 19: ...rrent test pins are provided for monitoring the actual tube current mA if needed Normally a jumper is installed to short the two pins refer to Figure 2 2 Remove the jumper and install the current meter in series to monitor the actual tube current Two test pins are located in TB3 TB3 15 TB3 16 Short the two pins if not used The pin definition shows below Pin Definition Description TB3 15 Tube curre...

Страница 20: ...ck that all cables are dressed neatly outside the cabinet and secured as necessary Check the ground connection again NOTE THE INSTALLER SHOULD ENSURE THAT ALL CABLE CONNECTIONS TO THE GENERATOR ARE SECURE AND ALL CABLES EXTERNAL TO THE GENERATOR ARE ADEQUATELY PROTECTED AGAINST ACCIDENTAL DISCONNECTION 2 11 GUI SOFTWARE The optional GUI utility software allows for data communication between the ge...

Страница 21: ... Monitor System Status and Fault sections are always visible and can be accessed at any time The Command Tab section provides access to other commands grouped together by function Clicking on the tabs at the top of the Command Tab section selects a particular group of commands Only one group tab can be selected at any one time See separate document for the detailed GUI instruction ...

Страница 22: ...N FOR SAFETY THE MAIN DISCONNECT SHOULD BE SWITCHED OFF AND LOCKED OUT WHILE CONNECTING ROOM EQUIPMENT 3 2 1 Connector Style and Pin Layout Figure 3 1 multi signal interface connector Pin Definition Description JB1 1 GND Generator signal ground for reference of interface circuits JB1 2 5VDC Out 5 volts DC from generator for use in powering interface circuitry such as opto couplers 100mA maximum JB...

Страница 23: ...OWN AEC User Signal to generator to rapidly turn HV OFF and ON during Exposure AEC Reference to GND LOW Shuts down HV JB1 13 RS232 ISO Ground Isolated ground from the isolated RS232 transceiver I C JB1 14 HVG FAULT Status Generator signal indicating generator fault Open collector transistor output Low Active Fault JB1 15 Status Bit 1 3 bit status lines for up to 6 status messages See separate matr...

Страница 24: ...op their own ultimate software based on open protocol Refer to separate document and design system control board to integrated PMX into their system with proper method Refer to 2 6 1 NOTE the isolation requirement 3 2 3 Digital I O Control Interface Remote digital control of the PREP ROTOR SHUTDOWN EXPOSURE X Ray SHUTDOWN are available on the 25 pin I O connector for maintenance All of these contr...

Страница 25: ...OTES Relay coil Z 178 Ω 5V 24 24V Figure 3 2 Digital I O Control Interface 3 2 4 Remote Status Interface Remote status signals for KV MIN tube current limit tube power limit overvoltage and filament Current limit over temperature and power supply fault is provided These signals are open collector type Normally off and are intended to drive the diode of an opto coupler Figure 3 3 for recommended in...

Страница 26: ...e power supply will shut down and a 3 bit binary code will be generated at the user interface connector JB1 To reset use the reset function on remote user interface The fault information is provided with three bits code Below is the information list More than one fault is defined with one code combination Use can get specific fault information by serial command BIT1 BIT2 BIT3 MESSAGE high high hig...

Страница 27: ...tomer side 20 21 1K 0 1 1K 0 1 1K 0 1 23 M M M kV monitor mA monitor Filament monitor Monitor return NOTES 1 Metering circuit should be high Z type 10Meg for accurat e measurement 2 All signals 0 10Vdc 0 100 of specified maximum outputs Figure 3 4 Remote monitoring interface 3 3 ETHERNET INTERFACE Ethernet is an optional serial communication interface with separate standard RJ45 style connector JB...

Страница 28: ...TE SAFETY PRECAUTIONS TO PROTECT PERSONNEL FROM X Ray RADIATION WARNING ALWAYS ENSURE THAT THE EQUIPMENT UNDER TEST AND ALL ASSOCIATED TEST EQUIPMENT IS PROPERLY GROUNDED ENSURE THAT THE HIGH VOLTAGE CABLES ARE INTACT UNDAMAGED AND PROPERLY CONNECTED BEFORE ATTEMPTING EXPOSURES ENSURE THAT THE PMX IS PROPERLY INSTALLED AS PER CHAPTER 2 AND CHAPTER 3 BEFORE OPERATING WHAT THIS CHAPTER DESCRIBES 4 2...

Страница 29: ...witch 2 does not change or reload the tube table if the unit is powered up with Switch 8 in the up position Table 1 Tube Table Selection Matrix Tube Selected Tube number Switch 1 Position Switch 2 position IAE XM1016T 0 Up Up Varian M113T 3 Down Up Invalid Setting do not use Down Down Follow the below steps to select the desired table from the pre installed tube table Step Action 1 Power down the ...

Страница 30: ...ion mode but in pause state as the Prep and Exposure is inactive 2 Enable Prep and Exposure to start calibration Calibration will be starting if both Prep and Exposure are activated Once the sequence has started the generator will automatically cycle through the exposure settings as long as the Prep and Exposure control are ON until it either finishes calibration or there is an exposure fault An e...

Страница 31: ... of 20kV is suggested mA 10mA suggested and EXPOSURE time 0 5 seconds suggested 2 PREP After presetting desired levels initiate a PREP command This will cause the X Ray tube anode rotor to start and apply filament pre heat current to the tube per value stored in the PMX internal memory 3 READY After approximately 2 seconds a READY status signal will be returned to the computer indicating that the ...

Страница 32: ...cate that the kV reach to 75 setting value and the exposure time begin to accumulate See below the timing Exposure kV T1 T2 kV设定值的 75 T Xray_ON Prep Exposure Ready Filament Inhibit Enable MA Program Enable KV Program DSP Inhibit Xray On Ma Servo HSS Low Speed States HSS High Speed States STOP STOP BOOST BOOST RUN STOP RUN RUN Hang Time RUN Hang Time BRAKE STOP BOOST BOOST RUN STOP RUN BRAKE STOP P...

Страница 33: ...nates when any of the following are true 1 Prep goes inactive low 2 Exposure control goes inactive low 3 The exposure timer times out Timer is set as part of exposure command 4 The 30 second Prep time is exceeded When in AEC Mode it is assumed that the AEC signal will be in the off state when the exposure sequence terminates If the AEC signal is ON an under time fault will occur The rotor continue...

Страница 34: ...rt are all involved with Smart AEC mode The sequence of events for doing a Smart AEC exposure is as follows 1 The host sends the required commands to set up the exposure These are HSS Speed Filament kV mA and exposure time for 3 point mode or Filament kV and mAs for 2 point mode Note that in smart AEC 2 point mode HSS Speed is automatically set to Fast 2 The host sets Prep On The unit will go into...

Страница 35: ...llow enough time for the filament to reach the desired temperature This may result in large mA variations at the start of the 2nd part of the exposure Note 3 In Smart AEC mode Break after exposure is forced to OFF and the Break after exposure hang time set to 30 seconds regardless of the previously programmed values This is the same as in standard AEC mode Note 4 There is no specified maximum time...

Страница 36: ...the AEC signal low before X Ray On status goes low X Ray Off will cause an under time fault Exposure commands sent at an illegal time such as when AEC is high or X Ray is ON will be ignored and will return a State Error code Exposure commands used to set up the 2nd part of the exposure must be sent at the time indicated in the diagram Aborting the Smart AEC sequence by bringing Prep and or Exposur...

Страница 37: ... 24V power supply is active DS3 DSP Alive RED Lit DS4 STATUS BIT1 YEL Lit 3 bit status lines for status messages Refer to chapter 3 the status messages matrix DS5 STATUS BIT2 YEL Lit DS6 STATUS BIT3 YEL Lit DS7 READY YEL Lit Indicate the generator is ready for X Ray exposure DS8 SPARE YEL Lit DS9 FAULT RED Lit Indicate generator fault DS10 X Ray shutdown AEC YEL Lit Indicate the status of the sign...

Страница 38: ...shutdown high voltage because an electric arc occurred 1 Check HV cable connections 2 Season X ray tube 3 Replace the X ray tube Over Power 5 An attempt was made to turn on the generator with settings that result in a power output of greater than 5kW Over Time 6 This fault is possible only in AEC Mode It indicates the unit shut down because of the expiration of the exposure timer rather than the A...

Страница 39: ...0 or mA output has exceeded 25 of the set value Note There is a delay from high voltage on to when the kV and mA are checked to allow time for the kV and mA to stabilize so false faults are not generated This time is 30 msec for kV regulation and 250 msec for mA regulation 1 Check the line voltage in good condition 2 Replace the X ray tube 3 Consult product support Open Filament 12 Tube filament s...

Страница 40: ...lt in the PMX supply operation Over Duty faults can only occur at the transition of exposure control from off to on That is right at the start of an exposure Once an exposure is started it will be allowed to continue even if after it is finished the on time exceeds 5 seconds over the previous 2 minutes Table 1 Guidance and MANUFACTURER S declaration ELECTROMAGNETIC EMISSIONS for all ME EQUIPMENT a...

Страница 41: ...rcial or hospital environment Surge IEC 61000 4 5 1 kV line s to line s 2 kV line s to earth 1 kV line s to line s 2 kV line s to earth Mains power quality should be that of a typical commercial or hospital environment Voltage dips short interruptions and voltage variations on power supply input lines IEC 61000 4 11 5 UT 95 dip in UT for 0 5 cycle 40 UT 60 dip in UT for 5 cycles 70 UT 30 dip in UT...

Страница 42: ...s the recommended separation distance in meters m Field strengths from fixed RF transmitters as determined by an electromagnetic site survey a should be less than the compliance level in each frequency range b Interference may occur in the vicinity of equipment marked with the following symbol NOTE 1 At 80 MHz and 800 MHz the higher frequency range applies NOTE 2 These guidelines may not apply in ...

Страница 43: ...ower of the communications equipment Rated maximum output power of transmitter W Separation distance according to frequency of transmitter m 150 kHz to 80 MHz d 1 17 P 80 MHz to 800 MHz d 1 17 P 800 MHz to 2 5 GHz d 2 33 P 0 01 0 117 0 117 0 233 0 1 0 370 0 370 0 737 1 1 17 1 17 2 33 10 3 70 3 70 7 37 100 11 7 11 7 23 3 For transmitters rated at a maximum output power not listed above the recommen...

Страница 44: ...t Procedures for High Voltage Power Supplies Copies can be obtained from the Spellman Customer Service Department Test equipment including an oscilloscope a high impedance voltmeter and a high voltage divider such as the Spellman HVD 100 or HVD 200 is needed for performance tests All test components must be rated for operating voltage 6 3 HIGH VOLTAGE DIVIDERS High voltage dividers for precise mea...

Страница 45: ...d serial number of the power supply in question 7 2 Correspondence and Ordering Spare Parts Each Spellman power supply has an identification label on the rear of the chassis that bears its model and serial number When requesting engineering or applications information please state the model and serial number of the power supply If specific components or circuit sections are involved in the inquiry...

Страница 46: ...early on the outside of the shipping container Packages received without an RMA Number will be returned to the customer The Customer shall pay for shipping to and from Spellman A preliminary estimate for repairs will be given by phone by Customer Service A purchase order for this amount is requested upon issuance of the RMA Number A more detailed estimate will be made when the power supply is rece...

Страница 47: ...To obtain information on Spellman s product warranty please visit our website at http www spellmanhv com en About Warranty aspx ...

Страница 48: ...information contained in this publication is derived in part from proprietary and patent data This information has been prepared for the express purpose of assisting operating and maintenance personnel in the efficient use of the model described herein and publication of this information does not convey any right to reproduce it or to use it for any purpose other than in connection with installati...

Страница 49: ...Errors 9 3 5 Timeouts 9 4 0 Command Overview 10 4 1 Command Mode Commands 10 4 2 Service Mode Commands 12 4 3 Response Overview 13 4 3 1 Set Command Response Format 13 4 3 2 Request Command Response Format 13 4 3 3 Warnings and Errors 14 4 4 Detailed Command Structure 15 4 4 1 Request Analog Monitor Readbacks 15 4 4 2 Request Status 18 4 4 3 Request Fault Status 22 4 4 4 Reset Faults 25 4 4 5 Set ...

Страница 50: ...ntrol Mode 51 4 4 25 Request AEC Mode 52 4 4 26 Set 2 Point 3 Point Mode 53 4 4 27 Request 2 Point 3 Point Mode 54 4 4 28 Set Smart AEC Mode 55 4 4 29 Request Smart AEC Mode 56 4 4 30 Request Current X Ray Tube Anode Heat Loading 57 4 4 31 Request Auxiliary Status 58 4 4 32 Request Expanded Fault Status 59 4 4 33 Request Expanded HSS Status 60 4 5 Service Mode Structure 62 4 5 1 Program Filament L...

Страница 51: ...4 5 13 Set Baud Rate 74 4 5 14 Set Calibration Mode On Off 75 4 5 15 Get Calibration Status 76 4 6 Serial Command Handling 78 5 0 Predictive filament 79 6 0 General Timing 81 7 0 Brake After Exposure 82 8 0 AEC Automatic Exposure Control Mode 84 9 0 2 Point and 3 Point Mode 85 10 0 Smart AEC Mode 87 11 0 Calibration Mode 91 ...

Страница 52: ...mmand arguments is a variable length string To represent the number 42 the string 42 042 or 0042 can be used This being the case commands and responses that carry data are variable in length 1 2 Check Sums The checksum is computed as follows Add the CMD and ARG bytes into a 16 bit or larger word The bytes are added as unsigned integers Take the 2 s compliment negate it Truncate the result down to ...

Страница 53: ...unctionality is provided by the software implementation of the Open Systems Interconnection OSI TCP IP protocol stack specifically the upper 4 layers Byte 0 Protocol Version Header Length Type Of Service Total Length 4 Packet ID Flags Fragmentation Offset 8 Time To Live Protocol Header checksum 12 Source Address 16 Destination Address 20 Source Port Destination Port 24 Sequence Number 28 Acknowled...

Страница 54: ... a transport for the serial PMX commands The commands themselves have the exact same format responses and meanings as with the RS232 serial command The command formats responses and examples as shown in section 4 apply equally to both RS232 and Ethernet communication 2 3 Ethernet RS232 use PMX will accept commands via the RS232 serial link or the Ethernet interface but only one communication inter...

Страница 55: ...g 42 042 or 0042 can be used This being the case commands and responses that carry data are variable in length 3 3 Checksums The checksum is computed as follows Add the CMD and ARG bytes into a 16 bit or larger word The bytes are added as unsigned integers Take the 2 s compliment negate it Truncate the result down to the eight least significant bits Clear the most significant bit bit 7 of the resu...

Страница 56: ...hecksum Errors If the DSP detects a checksum error the received message is ignored and the unit responds with a command byte equal to 1 as shown in the following sequence STX 1 CSUM ETX The 1 in the command byte indicates a checksum error has occurred 3 5 Timeouts There exists the possibility that the message from the Host to the unit is distorted so badly that the unit can t process the message a...

Страница 57: ...mand Mode Commands Command Mode RS232 Commands Command Name CMD ARG RANGE Request Analog Monitor Readbacks 19 None Request Status 22 None Reset Faults 31 None Set Exposure Settings 50 1 4 ASCII See cmd Get Exposure Settings 51 None Set Exposure Time 72 1 ASCII 20 12000 Set Exposure kV 10 1 ASCII 0 4095 Set Exposure mA 11 1 ASCII 0 4095 Set Exposure Filament 73 1 ASCII 0 1 Set Exposure mAs 74 1 ASC...

Страница 58: ...er Exposure 35 1 ASCII 0 1 Set Brake After Exposure Hang Time 36 1 ASCII 0 65535 Get Brake After Exposure Hang Time 37 None Set AEC Mode 57 1 ASCII 0 1 Request AEC Mode 58 None Set 2 Point 3 Point Exposure Mode 55 1 ASCII 0 1 Request 2 Point 3 Point Exposure Mode 56 None Set Smart AEC Mode 75 1 ASCII 0 1 Request Smart AEC Mode 76 None Request Current Anode Heat Load 77 None Request Auxiliary Statu...

Страница 59: ... Filament Limit Setpoint 16 None Request Filament Pre Heat Setpoint 17 None Get Revision 27 None Set Exposure Settings Max Exposure Time 40 1 ASCII 0 10000 Request Max Exposure Time 32 None Set Exposure Settings PreHeat Value 33 1 ASCII 0 4095 Set Ready For Exposure Time 34 1 ASCII 0 4095 Get Ready For Exposure Time 42 None Set Maximum mAs 38 1 4 ASCII 0 600 Get Maximum mAs 39 None Request Filamen...

Страница 60: ...ter If the setting is invalid or results in an invalid setup for the system a 1 or 2 character code will be returned See the following section on warnings and errors 1 ASCII comma 0x2C character CSUM Checksum see section 3 3 for details ETX 1 ASCII 0x03 End of Text character 4 3 2 Request Command Response Format The general format for the response to a request command is STX CMD ARG1 ARGn CSUM EXT...

Страница 61: ...icates an invalid or out of range parameter This is the only possible error for these functions Some functions such as the Set Exposure function use multiple error codes For these commands the meaning of the error codes is dependent on the particular command See the individual command for a list of possible error codes and their meaning A response of an ASCII 10 2 characters indicates a warning Th...

Страница 62: ...ive set values Direction Host to supply Syntax STX 19 CSUM ETX Example STX 19 CSUM ETX Response STX 19 ARG1 ARG2 ARG3 ARG4 AR G5 ARG6 ARG7 ARG8 ARG9 ARG10 ARG11 ARG12 ARG13 ARG14 ARG15 ARG16 CSUM ETX Where ARG in ASCII format ARG1 15V 0 4095 scaling 0 0062256 V Bit ARG2 15V 0 4095 0 0043663 ARG 16 4665 ARG3 24V 0 4095 0 0104762 V Bit ARG4 3 3Va 0 4095 0 00310847 V Bit ARG5 3 3Vb 0 4095 0 0011978 V...

Страница 63: ...rrent ARG14 The monitored current through the filament ARG15 Ground Voltage Offset This actually measures the offset error of the A D converter rather than an actual voltage Scaling Summary Table ARG Function Range Scaling Bit 1 15V 0 25 5V 0 0062256V Bit 2 15V note1 16 466V 0V Use Equation Voltage Arg 0 0043663 16 4665V 3 24V 0 42 9V 0 0104762V Bit 4 3 3V a note 2 0 12 73V 0 00310847V Bit 5 3 3V ...

Страница 64: ... b monitor the same voltage These voltages are used for an A D calibration routine To monitor the 3 3V the user may use either one 3 The kV and mA feedback values when X Ray is on are held for 2 seconds after the end of an exposure X Ray turns off This is the default mode of operation but if SW2 switch 6 is set then the values are not held after the end of the exposure Example STX 19 2048 1024 307...

Страница 65: ... in ASCII format representing unscaled value ARG1 X Ray On Off 1 On 0 Off ARG2 Safety Interlock 0 Open 1 Closed ARG3 Fault Condition 1 Fault 0 No Fault ARG4 Prep 1 Prep Active 0 Not in prep ARG5 Status Bit 1 ARG6 Status Bit 2 ARG7 Status Bit 3 ARG8 Tube Selection Bit 1 ARG9 Tube Selection Bit 2 ARG10 Tube Selection Bit 3 ARG11 Tube Selection Bit 4 ARG12 Load Tube Default Table to FRAM memory ARG13...

Страница 66: ...y will not make high voltage unless faults are cleared 0 no active faults See also Request Faults and Clear Faults Command ARG4 Prep Condition 1 Unit is in Prep state preparing to make X Ray shot 0 Unit is not in Prep state ARG7 ARG5 Status Flags 2 0 These flags mimic the state of the Fault status LEDs ARG5 ARG6 ARG7 Message 0 0 0 No Messages No Faults 1 0 0 Tube Temp Flow Fault HSS Fault Safety I...

Страница 67: ...ion line voltage input fault not bypassed 1 Test mode line voltage fault is bypassed ARG18 Open Filament Fault bypass 0 Normal operation unit faults on open filament 1 Test mode unit will not fault if open filament ARG19 Analog Programming Mode 0 Normal operation unit is under digital control from serial interface 1 Test mode unit is programmed via analog control ARG20 Over duty Fault bypass 0 Nor...

Страница 68: ...perature sensor must not read over 60c This ARG combines all of the above conditions in to a single flag If all of the conditions are ok then the Duty cycle OK flag will be 1 and it is ok to enter prep If any of the conditions listed above that would prevent an exposure is present this ARG will be 0 and attempting to enter prep will result in an over duty fault Note that if other faults or a setup...

Страница 69: ...ARG15 ARG16 ARG17 CSUM ETX Where ARG in ASCII format ARGx 1 Fault 0 No Fault ARG1 Interlock 1 Tube Temp ARG2 Interlock2 Tube Flow ARG3 HSS Fault ARG4 ARC ARG5 Over Power ARG6 Over Time ARG7 Over mAs ARG8 Over Duty ARG9 Over Voltage ARG10 Over Current ARG11 Regulation ARG12 Open Filament ARG13 Filament ARG14 AC DC ARG15 Under Time ARG16 Safety Interlock Fault ARG17 Setup Fault Fault Description ARG...

Страница 70: ...ious exposures exceeds 5 seconds in any 2 minute period An attempt to start a new exposure is made less than 20 seconds after the previous exposure ended An attempt to start a new exposure is made when the Inverter Temperature Sensor reading exceeds 60c The system is limited to a total exposure time of 5 seconds over a 2 minute period If the cumulative exposure time exceeds 5 seconds the exposure ...

Страница 71: ...ct the unit setup before an exposure can be made See the note after the example Example STX 68 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 CSUM ETX Note Operation of the Invalid Setup Status and Fault flags This note is an attempt to clarify the operation of the Invalid Setup Status Flag returned in the Request Status message and the Setup Fault Flag returned in the Request Faults message The Invalid Setup ...

Страница 72: ... the firmware resets all Fault messages and indicators Note that if the fault persists after the reset fault message the fault will immediately reoccur For example if the DC rail voltage is low AC DC fault and you clear the faults again reading the faults will still show a DC rail fault Direction Host to supply Syntax STX 31 CSUM ETX Example STX 31 CSUM ETX Response STX 31 ETX ...

Страница 73: ...s command should only be used when the unit is in 3 Point Mode If you are in 2 Point mode the command will not change the exposure settings Direction Host to supply Syntax STX 50 ARG1 ARG2 ARG3 ARG4 C SUM ETX Where ARG in ASCII format ARG1 Exposure Time in milliseconds ARG2 kV program 0 4095 0 50 000V ARG3 mA program 0 4095 0 200mA ARG4 Large Small Filament 1 Large 0 Small Example STX 50 4095 4095...

Страница 74: ...mmand is used in 3 Point Mode only Note 1 To clarify the meaning error codes please note the following Error Code 8 is returned if the Tube Table for that kV mA Filament setting has zero exposure time for both High and Low speed meaning there is no possible combination of exposure time and HSS speed that is valid for that combination of kV mA filament If the Tube Table has a non zero exposure time...

Страница 75: ...ngs Command if you are in 2 Point Mode In 2 Point mode mA and Exposure Time settings are automatically determined by the firmware using the kV and mAs settings Direction Host to supply Syntax STX 51 CSUM ETX Example STX 51 CSUM ETX Response STX 51 ARG1 ARG2 ARG3 ARG4 C SUM ETX Where ARG in ASCII format ARG1 Exposure Time in milliseconds ARG2 kV program 0 4095 0 50 000V ARG3 mA program 0 4095 0 200...

Страница 76: ...ws for additional parsing and expanded error code response over using individual commands but otherwise performs the same function This command should only be used when the unit is in mAs mA Mode If you are in 2 Point or 3 Point mode the command will not change the exposure settings Direction Host to supply Syntax STX 71 ARG1 ARG2 ARG3 ARG4 C SUM ETX Where ARG in ASCII format ARG1 kV program 0 409...

Страница 77: ...lly all arguments are in valid range but the combination is not 9 State Error An attempt to change exposure settings was made while X Ray was on 10 Invalid Setup Warning When the current settings are combined with the HSS Speed the setup is invalid 11 Mode Error The unit is not in mAs mA Mode this command is not allowed in 2 Point Mode or 3 Point mode Note 1 To clarify the meaning error codes plea...

Страница 78: ...26 HSS Speed This command should only be used when the unit is in 3 Point Mode If you are in 2 Point mode the HSS Speed is automatically set based on kV and mAs settings Direction Host to supply Syntax STX 59 ARG1 CSUM ETX Where ARG1 Speed in ASCII format Fast 1 Slow 0 Example STX 59 1 CSUM ETX Response STX 59 CSUM ETX Error Warning Code Responses STX 59 E CSUM ETX Where E is 3 Invalid Argument wa...

Страница 79: ...nd the new setting in combination will the current settings of the other exposure parameters is valid the unit will respond with a following the command field If the new setting is valid but the combination of the new setting plus the current settings of the other exposure parameters is illegal the unit will respond with a warning code of 10 In this case the host will be required to correct the se...

Страница 80: ...788 USA www spellmanhv com T 1 631 630 3000 F 1 631 435 1620 33 Error Warning Code Responses STX 72 E CSUM ETX Where E is 3 Exposure time out of bounds 9 State Error can t change when X Ray is on 10 Invalid Setup Warning 11 Mode Error unit is not in 3 Point Mode ...

Страница 81: ...osure parameters is illegal the unit will respond with a warning code of 10 In this case the host will be required to correct the setup problem If the setting is invalid out of range the unit will respond with and error code of 3 and the previous value of the kV program set point will remain in effect If the X Ray is currently on the unit will return an error code of 9 state error The host is not ...

Страница 82: ... the command field If the new setting is valid but the combination of the new setting plus the current settings of the other exposure parameters is illegal the unit will respond with a warning code of 10 In this case the host will be required to correct the setup problem If the setting is invalid out of range the unit will respond with and error code of 3 and the previous value of the mA program s...

Страница 83: ...118165 001 REV A 475 Wireless Boulevard Hauppauge New York 11788 USA www spellmanhv com T 1 631 630 3000 F 1 631 435 1620 36 11 Mode Error unit is in 2 Point mode not 3 Point Mode ...

Страница 84: ...f the new setting plus the current settings of the other exposure parameters is illegal the unit will respond with a warning code of 10 In this case the host will be required to correct the setup problem If the setting is invalid out of range the unit will respond with and error code of 3 and the previous value of the filament program will remain in effect If the Prep signal is active the unit wil...

Страница 85: ... A 475 Wireless Boulevard Hauppauge New York 11788 USA www spellmanhv com T 1 631 630 3000 F 1 631 435 1620 38 9 State Error Can t change with X Ray on 10 Invalid Setup Warning 11 Mode Error unit is in Smart AEC Mode ...

Страница 86: ... setting is valid but the combination of the new setting plus the current setting of the kV is illegal the unit will respond with a warning code of 10 In this case the host will be required to correct the setup problem If the setting is invalid out of range the unit will respond with and error code of 3 and the previous value of the mAs will remain in effect If the X Ray is currently on the unit w...

Страница 87: ...re The value is 0 12000 in mSec Note This command reads the value currently being used by the system which is mode dependent In 2 point mode this value is calculated using the mAs value along with the tube table In manual mode this value is set using the Set Exposure Time command When in 2 point mode the value read by this command is not the same as what is set using the Set Exposure Time Command ...

Страница 88: ...scription The host requests that the firmware report the kV set point This is the current value of the exposure kV setting The value is 0 4095 scaled the same as the kV program value 50kV 4095 12 21V Bit Direction Host to supply Syntax STX 14 CSUM ETX Response STX 14 ARG CSUM ETX Where ARG 0 4095 in ASCII format scaling 12 21V Bit Example STX 14 CSUM ETX ...

Страница 89: ...and reads the value currently being used by the system which is mode dependent In 2 point mode this value is calculated using the mAs value along with the tube table In 3 Point or mAs mA mode this value is set using the Set mA Set point command When in 2 point mode the value read by this command is not necessarily the same as what may have been previously set using the Set mA Set point Command Dir...

Страница 90: ...is command reads the value currently being used by the system which is mode dependent In 2 point mode this value is selected using the mAs value along with the tube table In manual 3 point mode this value is set using the Set filament command When in 2 point mode the value read by this command is not necessarily the same as what is set using the Set filament Command Direction Host to supply Syntax...

Страница 91: ...esponding to mAs values of 0 600 mAs 0 1 mAa Bit Note This command reads the value set by a previous Set Exposure mAs command If the system is in 2 point or mAs mA mode this is the current mAs setting If the system is in manual 3 point mode then this value is calculated from the set mA and set exposure time msec Direction Host to supply Syntax STX 54 CSUM ETX Response STX 54 ARG CSUM ETX Where ARG...

Страница 92: ...posure the average value to that point is reported The last exposure average value will be held until either a new exposure is started or a new prep cycle is started Prep goes from inactive to active If either of these conditions occurs the held value is discarded and the current kV value is reported The kV monitor value is from 0 4095 corresponding to voltages 0V 53476V 10 44V Bit Direction Host ...

Страница 93: ...as made If an exposure has competed X Ray On to Off the request will report the average value of the mA for the entire period of the last exposure X Ray On The last exposure value will be held until either a new exposure is started or a new prep cycle is started Prep goes from inactive to active If either of these conditions occurs the held value is discarded and the current mA value is reported T...

Страница 94: ...irmware sends the last exposure time length as measured from the 75 of programmed value points This is the actual exposure time of the last exposure not the value set by the Set Exposure Settings Command Direction Host to supply Syntax STX 65 CSUM ETX Example STX 65 CSUM ETX Response STX 65 ARG1 CSUM ETX Where ARG1 last exposure time in milliseconds in ASCII format Example STX 65 4095 CSUM ETX ...

Страница 95: ...osure is off the rotor remains running past the end of the exposure for a period of time specified by the Break after Exposure Hang time As long as prep remains active and the Break after Exposure Hang time does not expire a new exposure can be started without cycling Prep See Section 7 0 for more details on Break After Exposure operation Note there is no corresponding Get Break After Exposure com...

Страница 96: ...so see Section 7 0 for more details on Break After Exposure operation Note 1 The Break After Exposure Hang Time setting has no effect when Break After Exposure is set ON In this case the rotor begins breaking immediately regardless of this setting Note 2 The default Hang Time is 30 seconds and the last value set by this command is stored in non volatile memory and reloaded the next time the unit i...

Страница 97: ...ang Time This is the amount of time the X Ray tube rotor is driven after the end of an exposure The time is specified in milliseconds See the Set Break After Exposure Command for more details Also see Section 7 0 for more details on Break After Exposure operation Direction Host to supply Syntax STX 37 CSUM ETX Response STX 37 ARG CSUM ETX Where ARG 0 65535 in ASCII format This is the Break After E...

Страница 98: ...rate in AEC mode The AEC control signal also called the X Ray disable signal will be allowed to turn the X Ray On Off If the AEC mode is Off the AEC control signal will be ignored Direction Host to supply Syntax STX 57 ARG CSUM ETX Where ARG 0 or 1 0 AEC Mode Off 1 AEC Mode On Example Sets the AEC Mode On STX 57 1 CSUM ETX Response STX 57 CSUM ETX Error Warning Code Responses STX 57 E CSUM ETX Whe...

Страница 99: ...52 4 4 26 Request AEC Mode Description The host requests that the firmware report the current setting of the AEC Automatic Exposure Control Mode On or Off Direction Host to supply Syntax STX 58 CSUM ETX Response STX 58 ARG CSUM ETX Where ARG 0 1 in ASCII format 0 AEC Mode Off 1 On Example AEC Mode is OFF STX 58 0 CSUM ETX ...

Страница 100: ... exposure and the exposure mA exposure time and HSS Speed are automatically set based on those The exposure mA chosen will be the highest allowed mA for the tube for the given filament and kV settings In mAs mA mode the host programs the unit by specifying filament kV mAs and mA The exposure time is automatically determined by those parameters IMPORTANT NOTE Changing the modes does NOT change any ...

Страница 101: ... 54 4 4 28 Request mode 2 point 3 point mAs mA Description The host requests that the firmware report the current operating mode 2 Point or 3 Point Direction Host to supply Syntax STX 56 CSUM ETX Response STX 56 ARG CSUM ETX Where ARG 0 1 in ASCII format 0 3 Point 1 2 Point 2 mAs mA Example 3 Point mode STX 56 0 CSUM ETX ...

Страница 102: ...or a description of Smart AEC S AEC mode Direction Host to supply Syntax STX 75 ARG CSUM ETX Where ARG 0 or 1 0 AOP Mode Off 1 AOP Mode On Example Sets the AOP Mode On STX 75 1 CSUM ETX Response STX 75 CSUM ETX Error Warning Code Responses STX 75 E CSUM ETX Where E is 3 invalid argument not 1 or 0 9 State Error Can t change with X Ray on Notes Smart AEC mode and Standard AEC mode are mutually excl...

Страница 103: ...1620 56 4 4 29 Request Smart AEC Mode Description The host requests that the firmware report the current setting of the Smart AEC Mode On or Off Direction Host to supply Syntax STX 76 CSUM ETX Response STX 76 ARG CSUM ETX Where ARG 0 1 in ASCII format 0 AOP Mode Off 1 On Example Smart AEC Mode is ON STX 76 1 CSUM ETX ...

Страница 104: ...be Anode Heat Loading Description The host requests that the firmware report the current anode heat load of the X Ray tube as a percentage of the allowed maximum for the tube Direction Host to supply Syntax STX 77 CSUM ETX Response STX 77 ARG CSUM ETX Where ARG 0 100 in ASCII format representing 0 no heat to 100 maximum allowed heat Example STX 77 CSUM ETX ...

Страница 105: ...llowed Description of Auxiliary Status ARG1 RTC Battery OK 1 RTC Battery Ok 0 RTC Battery is Low and requires replacement If this status flag is zero the RTC may not track shutdown time properly This may cause incorrect calculation of anode cooling during shut down and result in an incorrect anode heat load reading ARG2 Anode Heat Load Ok 1 The Anode heat load is Ok to make another exposure 0 The ...

Страница 106: ... temperature sensor read 60c Direction Host to supply Syntax STX 69 CSUM ETX Example STX 69 CSUM ETX Response STX 69 ARG1 ARG2 ARG3 ARG4 CSUM ETX Where ARG is 0 or 1 in ASCII format ARG1 kV Regulation Fault 1 Fault 0 No Fault The regulation fault reported in the request faults command was due to kV regulation error ARG2 mA Regulation Fault 1 Fault 0 No Fault The regulation fault reported in the re...

Страница 107: ...he exception of the mis wire fault which can be ASCII 0 3 Direction Host to supply Syntax STX 84 CSUM ETX Example STX 84 CSUM ETX Response STX 84 ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 ARG8 ARG9 ARG1 0 ARG11 ARG12 ARG13 CSUM ETX Where ARG is 0 or 1 in ASCII format except for ARG 11 which can be 0 to 3 ARG1 Bus Under Voltage Fault 1 Fault 0 No Fault ARG2 Phase Under Current Fault 1 Fault 0 No Fault ARG...

Страница 108: ...be faulted Note that this serial link is not used in regular operation and is only used to retrieve the detailed fault status If the link fails the unit will still continue to function normally with the exception of getting expanded status using this command Notes The expanded HSS faults are cleared along with the rest of the faults by the Reset Faults command however if the condition causing the ...

Страница 109: ...ution These limits are set to protect the supply and the X Ray tube from damage due to improper programming Commands that modify system limits should not be used as part of normal operation See the individual command description for warnings 4 5 1 Program Filament Limit Description The host requests that the firmware change the Filament Limit Note This command is intended for system testing The Fi...

Страница 110: ...equest Filament Limit Set Point Description The host requests that the firmware report the current Filament Limit set point Filament currents above this limit will result in a fault Direction Host to supply Syntax STX 16 CSUM ETX Response STX 16 ARG CSUM ETX Where ARG 0 4095 in ASCII format 0 4095 0 6 0A Example STX 16 4095 CSUM ETX ...

Страница 111: ... 3000 F 1 631 435 1620 64 4 5 3 Request Filament Pre Heat Set Point Description The host requests that the firmware report the current Filament Pre Heat set point Direction Host to supply Syntax STX 17 CSUM ETX Response STX 17 ARG CSUM ETX Where ARG 0 4095 in ASCII format Example STX 17 4095 CSUM ETX ...

Страница 112: ...re settings command command 50 and the Set exposure Time command command 72 It does not change the current exposure time set by command 50 or 72 This is a service command and should be used with caution because it over rides the tube table and allows exposure times that may damage the supply or X Ray tube This command should not be used in general operation Direction Host to supply Syntax STX 40 A...

Страница 113: ...mum exposure time that can be set by the Set Exposure Settings command or Set Exposure Time command Note Unless the Set Max Exposure Time Command Command 40 has been sent this value will be the contents of the Tube Table for the current exposure setting assuming the current exposure setting is valid Direction Host to supply Syntax STX 32 CSUM ETX Response STX 32 ARG CSUM ETX Where ARG 0 20000 in A...

Страница 114: ...re change the filament pre heat current value The value scaling is 1 465 mA Bit The range is 0 to the current maximum filament limit set point or 6 0A whichever is smaller Warning changing the pre heat value may result in improper operation or X Ray tube damage Direction Host to supply Syntax STX 33 ARG CSUM ETX Where ARG 0 4095 in ASCII format 0 4095 0 6 0 A Example STX 33 4095 CSUM ETX Response ...

Страница 115: ...ill result in improper operation This command is intended for system testing only Direction Host to supply Syntax STX 34 ARG CSUM ETX Where ARG 0 5000 in ASCII format time in milliseconds Example STX 34 4095 CSUM ETX Response STX 34 CSUM ETX Note The PMX unit has a maximum prep time of 30 seconds meaning that no matter what you program If the total time in prep Prep Exposure control on time exceed...

Страница 116: ...t Ready For Exposure Time Description The host requests that the firmware report the ready for exposure time This is the amount of time after entering Prep before X Ray On is allowed Direction Host to supply Syntax STX 42 CSUM ETX Response STX 42 ARG CSUM ETX Where ARG Time in milliseconds in ASCII format Example STX 42 4095 CSUM ETX ...

Страница 117: ...nges the system mAs limit exposure mA setting exposure time that you can set with the exposure command not the set mAs This is a service mode command intended for system testing only Changing this limit beyond the default may allow damage to the supply or X Ray tube The scaling is 1mA Sec Bit Direction Host to supply Syntax STX 38 ARG CSUM ETX Where ARG 0 600 in ASCII format units are mA Sec Examp...

Страница 118: ... 4 5 10 Get Maximum mAs Description The host requests that the firmware report the current maximum mAs limit This is the maximum limit not the current exposure mAs setting Direction Host to supply Syntax STX 39 CSUM ETX Response STX 39 ARG CSUM ETX Where ARG 0 600 in ASCII format units are mA Sec Example STX 39 600 CSUM ETX ...

Страница 119: ...s that the firmware report the current Filament Current Feedback This value is from 0 4095 corresponding to filament currents of 0 6 415A 0 0015665A Bit The filament current feedback value is also available using the Request Analog Monitor Readbacks command Direction Host to supply Syntax STX 62 CSUM ETX Response STX 62 ARG CSUM ETX Where ARG 0 4095 in ASCII format Example STX 62 4095 CSUM ETX ...

Страница 120: ...n Description The host requests that the firmware sends the current revision of the DSP and FPGA firmware Direction Host to supply Syntax STX 27 CSUM ETX Example STX 27 CSUM ETX Response STX 27 ARG1 ARG2 CSUM ETX Where ARG1 DSP firmware revision ASCII format 0 10000 ARG2 FPGA firmware revision ASCII format 0 10000 Example STX 27 29 62 CSUM ETX ...

Страница 121: ...the Baud Rate of the serial port Note that the command response is sent at the old baud rate and the host should wait 500msec before sending another command at the new baud rate to allow the new baud rate to take effect Direction Host to supply Syntax STX 07 ARG CSUM ETX Where ARG 2 or 5 in ASCII format 2 19200 5 115200 Example STX 07 1 CSUM ETX Response STX 07 CSUM ETX Response sent at old baud r...

Страница 122: ...on sequence but the sequence will not start until the Prep and Exposure control signals are both ON high The proper procedure is to send this command with Prep and Exposure Control OFF The calibration function will go to the Paused state waiting for the external exposure controls to enable the actual exposure Once the Prep and Exposure control signals go high the actual calibration sequence will r...

Страница 123: ...Calibration Running The unit is in calibration mode actively doing the calibration sequence The X Rays will be generated 3 Calibration Successful The unit has successfully completed calibration and exited calibration mode The new preheats have been written to FRAM 4 Calibration Fault The unit faulted during calibration and aborted the process as a result Calibration mode has been exited The fault ...

Страница 124: ...oulevard Hauppauge New York 11788 USA www spellmanhv com T 1 631 630 3000 F 1 631 435 1620 77 Terminating a calibration sequence by writing a Set Calibration Mode command with an argument of zero will cause the status to return to 0 ...

Страница 125: ...e buffer of partial or corrupt messages 4 6 3 Handshaking The only handshaking implemented on the host interface is built in to the implementation of this protocol That is the host must initiate all communications If the supply receives a program command an acknowledge message is sent back to the host via the message If the host does not receive an acknowledge within the time out window the host s...

Страница 126: ...is left unchanged if the error is less than 25 mA the preheat will be adjusted up or down by 1 LS Bit 1 4 mA of filament current If the error is more then 25mA then the amount of adjustment is calculated by taking the tube curve delta filament current delta mA for that delta filament current multiplying by the mA error and taking 80 of that value 4 If the exposure is terminated normally the prehea...

Страница 127: ... VMX 3 12 2010 Preheat mA loop cntrl Fil fdbk mA Sampled here Exposure On mA fdbk mA Servo Activated Ideal response Enable HV Output mA overshoot This is due to too much Fil Preheat mA undershoot This is due to too little Fil Preheat PreHeat End of Exposure Figure 1 Figure showing the time sampling of mA feedback during transition from preheat to mA servo ...

Страница 128: ...ent Inhibit Enable MA Program Enable KV Program Ready DSP Inhibit Xray On 10 ms ramp full scale 20 sec between exposures 2 sec Prep to Ready 5 sec Max Exposure Time 12 ms delay to MaServo Ma Servo 30 sec Max Prep Time HSS Low Speed States HSS High Speed States STOP STOP BOOST 2 sec BOOST 2 sec RUN 20 sec min STOP STOP BRAKE 5 sec RUN 20 sec min Figure 13 General Timing ...

Страница 129: ...emoved the same as BAE enabled When BAE is enabled the brake should happen once Exposure command goes inactive After brake occurs the generator is no longer at READY status Prep sequence has to be initiated Prep goes low then high Prep Exposure Ready Filament Inhibit Enable MA Program Enable KV Program DSP Inhibit Xray On Ma Servo HSS Low Speed States HSS High Speed States STOP STOP BOOST BOOST RU...

Страница 130: ... 631 630 3000 F 1 631 435 1620 83 Prep Exposure Ready Filament Inhibit Enable MA Program Enable KV Program DSP Inhibit Xray On Ma Servo HSS Low Speed States HSS High Speed States STOP STOP BOOST 2 sec BOOST 2 sec RUN 20 sec min STOP STOP BRAKE 5 sec RUN 20 sec min Figure 15 BAE Enabled Timing ...

Страница 131: ...s inactive low 2 Exposure control goes inactive low 3 The exposure timer times out Timer is set as part of exposure command 4 The 30 second Prep time is exceeded When in AEC Mode it is assumed that the AEC signal will be in the Off state when the exposure sequence terminates If the AEC signal is ON an under time fault will occur The rotor continues to run when the X Ray is shut off by the AEC sign...

Страница 132: ...ser These parameters are kV set point mA set point exposure time filament size large small and rotor speed Fast Slow In 2 Point mode the desired filament spot size kV and mAs milliamp seconds of the exposure is set The mA exposure time and rotor speed are then automatically selected using the tube tables The selection algorithm is given in the following flow chart Figure 17 Finally in mAs mA mode ...

Страница 133: ...re mAs by proposed mA mA1 to get proposed exposure time T1 Go to Tube Table and find maximum exposure time for current kV mA Filament speed Setting T Max T1 T Max Settings Valid Set Result code to Ok Set Exposure kV programmed kV mA mA1 Exposure Time T1 Filament Proposed Fil Speed Proposed Speed Proposed Speed Low Change Proposed Speed to High Proposed mA1 20 mA Change Proposed mA1 to 10 mA lower ...

Страница 134: ...the X Ray On status 5 After the X Ray On status transitions from ON to OFF the Host should set the AEC control to the X Ray disabled state Low The host must also leave the Prep and exposure control signals ON during this time 6 The host must now send the settings for the next part of the exposure over the serial interface Any combination of kV mA exposure time if in 3 point mode or kV and mAs if i...

Страница 135: ... of the previously programmed values This is the same as in standard AEC mode Note 4 There is no specified maximum time between the exposures in a Smart AEC sequence The limiting factor is that the unit can have Prep active for a maximum of 30 seconds so the entire exposure sequence of all exposures including the 2 second time to ready can t be longer than 30 seconds Note 5 The AEC control signal ...

Страница 136: ...art of exposure 2 seconds Fig 18 Smart AEC Mode 2 exposures shown Previous Exposure Value Previous discarded kV mA report Current values Exposure Part 1 kV mA Being averaged Exposure Part 1 average kV and mA held Exposure Part 2 kV mA Being Averaged Exposure Part 2 average kV and mA held Value Returned using Request Last Exposure kV mA Monitor Notes Setting the AEC signal low before X Ray On statu...

Страница 137: ...3 point mode or Set Exposure kV and Set Exposure mAs in 2 point mode It is allowed but not required to send a Set Filament or Set HSS Speed command in between exposures If either of these commands are sent however the setting must be the same as in the part 1 exposure It is not allowed to change from 2 Point Mode to 3 Point mode or the reverse in the middle of a Smart AEC exposure ...

Страница 138: ... and or Exposure control during the sequence the calibration routine will enter a Paused state It will not exit calibration mode but it will stop doing exposures and wait until Prep and Exposure control are both returned to the ON state If the user returns Prep and Exposure control ON the PMX will continue the calibration Usually it will continue from where it was when the sequence was paused but ...

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