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Siemens POLYMOBIL Plus Service Instructions Manual Download Page 37

Measurements

5 - 15

Siemens AG

 

SPR8-125.061.02

Page 15 of 20

POLYMOBIL Plus

Medical Engineering

Rev. 01

01.00

TD SD 24

 

 

Testing and setting the mAs counter

5

•

Unscrew the lid of the single tank cover.

•

Pull out the mAs jumper on D900 and connect the mAs meter.

•

Set 70 kV, 80 mAs on POLYMOBIL Plus and release exposure.

If the value displayed on the mAs meter does not coincide with the value set on 
POLYMOBIL Plus, adjust the mAs counter with P1 on D915.

Release another exposure and compare the display.

Observe the cooling intervals for the tube.

WARNING

Summary of Contents for POLYMOBIL Plus

Page 1: ...production transmission or use of this document or its contents is not permitted without express written authority Offenders will be liable for damages All rights including rights created by patent grant or registration of a utility model _or_ design _are_ reserved SP Service Instructions From Serial No 10100 ...

Page 2: ...BIL Plus SPR8 125 061 02 Page 2 of 4 Siemens AG Rev 01 01 00 TD SD 24 Medical Engineering 0 2 Revision Chapter Page Rev 0 all 01 1 all 01 2 all 01 3 all 01 4 all 01 5 all 01 6 all 01 Letzte Seite des Kapitel ...

Page 3: ... 6 D950 capacitor charging circuit 2 7 D970 Capacitor bank 2 7 Status of the LED s optimum condition 2 8 3 _______Troubleshooting_________________________________________________ 3 1 Error messages 3 1 Troubleshooting after error messages 3 2 4 _______Service programs _______________________________________________ 4 1 Service programs available 4 2 5 _______Measurements __________________________...

Page 4: ... 5 16 Testing and readjusting the counterbalance 5 19 Readjusting the counterbalance with accessories attached 5 19 6 ______ Replacing important components __________________________________6 1 Replacing the single tank generator 6 1 Replacing the collimator 6 3 Replacing the lamp for the localizer 6 4 Replacing the steering caster 6 5 Replacing the capacitor bank 6 6 7 ______ Changes to previous ...

Page 5: ...Notices are information provided with special emphasis to facil itate proper use of the equipment or proper execution of a proce dure Block circuit diagram X 069I Function description SPR8 125 041 01 A detailed circuit diagram DIN A 3 can be ordered under item number 18 20 377 X069I Standard service kit Digital multimeter 2 channel memory oscilloscope mAs meter Protective conductor meter Equivalen...

Page 6: ...please note the product specific safety information in the document the safety information in RA0 000 012 in the Register of the POLYMOBIL Plus binder as well as the safety information contained in the ARTD Part 2 Tests and adjustments that must be performed with radiation ON are identified by the radiation warning symbol Radiation protection must be worn during these types of adjustments CAUTION ...

Page 7: ... board or more accessible on the D 970 capacitor board at the connection point of capacitor C3 and on the right side of fuse F3 refer to Fig 1 LED s V1 V10 on D 970 go out at a significantly higher voltage level and therefore they are not reliable safety indicators If a fuse on the D 970 has responded high voltage may still be present at the affected capacitor even after a prolonged period of time...

Page 8: ...ESD guidelines when handling boards Replacing damaged or missing screws 1 Damaged or missing screws may only be replaced by steel screws as specified in the installation drawings conforming to DIN267 and must have the specified tensile strength Cleaning 1 The unit must always be switched off or disconnected before cleaning Use only water to clean the unit or a lukewarm dilute solution consisting o...

Page 9: ... TD SD 24 Checking the assemblies 2 Preparation 2 When working on the open system there is the danger of Electric shock The capacitor bank can still be charged Do not attempt to work on the system while this condition exists For details see chapter Prerequisites Fig 1 VCC R5 C1 R3 R4 WARNING ...

Page 10: ... the assemblies To check the assemblies remove the upper covers the handles and the lower front cover of the switchbox Proceed as follows Switch POLYMOBIL Plus OFF and disconnect the line voltage plug Remove the 4 Allen screws 1 Fig 2 in the handle and remove the handle refer to Fig 2 and Fig 3 Fig 2 Fig 3 1 ...

Page 11: ...remove the bottom cover at the front with the cassette tray Remove the four screws of the top housing 4 Fig 5 To stay clear of the exposure guide holder tilt the housing forward and lift it up to remove it Always measure the actual voltage present with the DVM at test points VCC and VCC on the D 960 inverter board or more accessible on the D 970 capacitor board at the connection point of capacitor...

Page 12: ...V22 Preparation ON V23 Exposure ON V24 Error occurred V25 not used V34 Radiation ON X15 Pin Color 1 black Ground 5 V 3 black Ground 5 V 4 red 5 V 5 5 brown 15 V 10 6 blue Ground 15 V 7 yellow 15 V 10 P1 Setting of the mAs counter P2 OFFSET mAS converter Set at the factory Do not change P3 Max filament inverter frequency P4 Max main inverter frequency P5 Adjustment setting of filament heating circu...

Page 13: ...uxiliary voltage for I O ok AR Line voltage for anode starter ok DC DC 300 V voltage for filament ok F1 10 AT 12 5V for collimator lamp F3 0 6 AT Auxiliary voltage 12 5 V for I O F4 0 6 AT Auxiliary voltage 12 5 V F5 3 2 AF Line voltage for anode starter F6 1 0 AT Line voltage for filament circuit F7 10 AT Power F8 10 AT Power Fig 6 ST P1 P2 P3 P4 P5 P6 X11 X10 X20 X12 P7 GND JR REG CAL KVP KV KVN...

Page 14: ...s Measurement points U1 power supply unit 5 V 5 15 V 10 2 Fuse 2 A T U2 power supply unit 12 5 V 10 2 Fuse 5 A T VP 15 V 10 for inverter frequency P12 12 5 V 10 auxiliary voltage GNDL Ground 12 5 V X4 Pin Color 1 red 12 5 V 10 2 red 12 5 V 10 3 red 12 5 V 10 4 black Ground 12 5 V 5 black Ground 12 5 V 6 black Ground 12 5 V ...

Page 15: ... than 450 V F1 10 AT Charging circuit ERR Error output charging error VC Capacitor voltage 1 V 100 V IC Capacitor charging current FR1 Charging circuit frequency dependent on the line voltage and VC GND Ground CAR Signal to enable the charger FR2 Frequency of the auxiliary power supply OK Signal to indicate the full charge V1 V10 Capacitor voltage present at C1 C10 F1 F10 20AF Capacitor charging v...

Page 16: ...der b and also V22 on D915 d Exposure All LED s as described under b and also V22 and V23 as well as radiation indicator V34 on D915 In case of an error V24 on D915 glow red D925 LED 12 V ON LED I O ON D950 LED 450 Vcc V30 glows for 10 minutes following shutdown D970 all LED s glows for 10 minutes following shutdown D915 The exposure values are displayed D925 LED VP ON LED 12 V ON LED I O ON LED A...

Page 17: ...0 Err 6 mAact 0 Err 7 Rot 0 Err 8 Braking failure Error in the rotating anode circuit Err 9 Pressure switch Oil pressure switch in the single tank is active Err 30 Fast capacitor charge Capacitor bank is charging too fast Err 31 Slow capacitor charge Capacitor bank is charging too slow Err 33 Inverter Error Err 34 Filament circuit Inverter Short Cir cuit Err 10 Rot 0 No rotating anode acceleration...

Page 18: ...upply U1 Is power supply U1 defective Err 3 Vfil Vstby none or insufficient filament current Do V1 DC and V2 DC flash on D925 Otherwise check fuse F6 No filament frequency Check D915 Connection D925 X ray tube unit X5 ConnectionD925 D915 X11 Check X ray tube assembly D925 defective Err 4 Vfil Vstby filament current is too high Do V1 DC and V2 DC flash on D925 Otherwise check fuse F6 Filament frequ...

Page 19: ...ng acceleration Check D925 Is the power factor correction capacitor C2 defective Connection to in the single tank generator ok Err 11 Short circuit in main inverter Check D960 Check D915 Main inverter frequency too high Err 12 KVmax Interruption of KVact measurement Measure TP KVN and KVP on D915 Both signals must have the same amplitude KVN or KVP 70 kV Error in kV measurement circuit Error in kV...

Page 20: ...ent incorrectly set P5 on D915 Error on D915 Err 22 Maximum preparation preparation time too long Prep level pressed too long Err 30 Fast capacitor charge capacitor bank charges too fast Are all fuses on the capacitor bank D970 ok Are there defective capacitors Is the line voltage too high 250 V Is the charging frequency too high Configure the capacitor bank D950 defect Err 31 Slow capacitor charg...

Page 21: ... quit the service mode switch the POLYMOBIL Plus off on or press the Reset button SW 2 2 Fig 1 KV keys toggle between the programs When you are already in a program the next or previous program step is selected Setting of the kV values in Pr 5 and Pr 6 mAs Setting of the mAs values in Pr 5 and Pr 6 Lamp switch Activating or quitting the current program Fig 1 ST P1 P2 P3 P4 P5 P6 X11 X10 X20 X12 P7...

Page 22: ...rs The left display indicates how many errors there are The error message is displayed in the right display The latest error is displayed first Pr 4 Deletes error memory Press mAs key for approximately 4 seconds Pr 5 Sets the default exposure parameters according to customer request Pr 6 Sets the maximum possible KV and mAs values according to customer request Pr 7 Adjusts FMAX on the main inverte...

Page 23: ... 110 V 10 or 230 V 10 The line voltage is adjusted automatically Measuring KVact and Itube 5 Connect the oscilloscope to TP JR KV and GND on D915 Set 90 kV and 10 mAs at the POLYMOBIL Plus and release an exposure The oscillogram should correspond to the one shown in Fig 1 CH1 TP JR 1 0 V Div CH2 TP KV 1 0 V Div Ground at GND 10 ms Div Trigger external at TP TRG Fig 1 ...

Page 24: ...rging circuit 5 Charging frequency 5 Connect the oscilloscope to D 950 at TP FR1 and GND After switch on the following oscillogram can be measured The capacitor charging frequency is 25 kHz and cannot be adjusted Signals are only present during charging of the capacitors CH1 TP FR1 5 0 V Div Ground at GND 20 µs Div NOTICE Fig 2 ...

Page 25: ...he oscilloscope to D 950 at TP IC and GND After switch on the following oscillogram can be measured The charging current is dependent on the line voltage present and the charge sta tus capacitor voltage Uc of the capacitor bank Fig 3 shows the charging current in standby i e when the C bank is charged CH1 TP IC 500 mV Div Ground at GND 20 µs Div Fig 3 ...

Page 26: ...ltage the signal ERR is output on D950 The charging time depends upon the residual charge of the capacitor bank and on the available line voltage e g with 230 V the max charging time is about 15 s In the worst case line voltage 100 V and residual charge 0V charging time can take 40 seconds For the following measurement the line voltage was 230 V and the residual charge 30 V You can measure the cap...

Page 27: ...ing Rev 01 01 00 TD SD 24 Rotating anode starter 5 Acceleration 5 Fig 5 shows the stator currents during rotating anode acceleration 230 V The currents are correspondingly lower at 100V line voltage Fig 5 CH2 D915 test point I1 1 V 0 25 A CH1 D915 test point I2 1 V 0 25 A 10 ms Div NOTICE ...

Page 28: ...01 00 TD SD 24 Medical Engineering 5 6 Measurements Brakes 5 Fig 6 shows the stator currents during braking 230 V The currents are correspondingly lower at 100V line voltage Fig 6 CH2 D915 test point I1 1 V 0 25 A CH1 D915 test point I2 1 V 0 25 A 10 ms Div NOTICE ...

Page 29: ...P REG and GND Measure FMAX in the service program Pr 7 Refer to Service program section on Service programs available Setting the maximum main inverter frequency with potentiometer P4 on D 915 It is generally not necessary to set the main inverter frequency in the field When ordered as a replacement D915 is preset at the factory NOTICE Fig 7 FMAX 18 kHz TMIN 55 5 µs Tolerance 1 5 µs 1 5 µs 5 V Div...

Page 30: ...he cable again Connect the oscilloscope to the current transformer Switch ON POLYMOBIL Plus Set 60 KV 10 mAs on POLYMOBIL Plus and release exposure The diagram must correspond to Fig 8 Prior to beginning the following instructions you must discharge the capacitor bank because life threatening DC voltage is present Check the actual charge with the DVM The maximum main inverter frequency can only be...

Page 31: ...ng the kVact and kVnom 5 Connect the oscilloscope to D915 at TP KV KVS and GND Set 60 KV 10 mAs on POLYMOBIL Plus and release exposure The oscillogram must appear like the one in Fig 9 The KVnom value can be set with P7 on D915 kVact CH1 D915 test point KV 1 V 20 KV kVnom CH2 D915 test point KVS 1 V 30 KV 20 ms Div Fig 9 ...

Page 32: ...e kVact cable from the single tank generator to the D915 is damaged or disconnected The monitor KVM responds curve 3 because KVN and KVP have different amplitudes the exposure is terminated with ERR 12 Refer to function description KV monitoring Exposure data 102 KV 10 mAs KVact CH1 D915 test point KV Itube CH2 D915 test point JR CH3 D915 test point KVM 1 ms Div Fig 10 ...

Page 33: ...MOBIL Plus Medical Engineering Rev 01 01 00 TD SD 24 Testing the filament circuit 5 Filament circuit in standby 5 Connect the oscilloscope to D915 at TP CAL I and GND Filament inverter frequency CH1 D915 test point CAL Filament current CH2 D915 test point I Fig 11 ...

Page 34: ...nverter freqency is 25 kHz and can be set with P3 on D915 Proceed as follows Switch POLYMOBIL Plus OFF Remove fuse F6 on D925 Connect the oscilloscope to D915 at TP CAL and GND Switch POLYMOBIL Plus ON Err 03 is blinking The oscillogram must appear like the one in Fig 12 Setting the maximum filament inverter frequency with potentiometer P3 on D915 Fig 12 CH1 D915 test point CAL 20 µs Div ...

Page 35: ...t the oscilloscope to D915 at TP JR IH and GND Set 60 kV 10 mAs on POLYMOBIL Plus and release an exposure The oscillogram must appear like the one in Fig 13 If this is not the case adjust P5 on D915 until there is minimal current overshoot at the beginning of the exposure The standby heating of the exposure is set via P5 Fig 13 shows the correct setting In Fig 14 the standby heating is set too hig...

Page 36: ...61 02 Page 14 of 20 Siemens AG Rev 01 01 00 TD SD 24 Medical Engineering 5 14 Measurements Fig 14 T T Ch1 500mV 1 00V M20 0ms Ch3 1 56V Ch1 Tek Stop Single Seq 2 50kS s 3 Standby heating too high Fig 15 Standby heating too low ...

Page 37: ...of the single tank cover Pull out the mAs jumper on D900 and connect the mAs meter Set 70 kV 80 mAs on POLYMOBIL Plus and release exposure If the value displayed on the mAs meter does not coincide with the value set on POLYMOBIL Plus adjust the mAs counter with P1 on D915 Release another exposure and compare the display Observe the cooling intervals for the tube WARNING ...

Page 38: ...SID of 100 cm or 40 to the top edge of the cassette using a measuring tape Use the knobs to set a format of 18 cm x 24 cm or 8 x 10 Switch on the light localizer and align the cassette Apply radiopaque markers e g washers coins as shown in Fig 16 Use one washer as a side marker Release an exposure 60 kV 10 mAs and develop the film Log the following data on the developed film using a water resistan...

Page 39: ...2 between the edges of the light field and the radiation field on all four sides corresponding to Fig 17 Calculate the total deviations in the X and Y directions disregarding the algebraic sign The deviations in length total Y as well as the deviations in width total X must be smaller than 1 6 cm respectively Fig 17 X1 Y1 Y2 X2 Film Light field Radiation field ...

Page 40: ...the deviation is larger loosen the 4 Allen screws a little arrow Fig 18 19 and shift the collimator accordingly After adjusting the collimator tighten the screws again arrow Fig 18 19 Repeat the test and readjust the collimator until the light and radiation fields are within the acceptable tolerance 1 6 cm Fig 18 Fig 19 ...

Page 41: ... Readjusting the counterbalance with accessories attached 5 If the C arm with accessories attached does not come to a stop in any desired position readjust the spring tension for the counterbalance Remove the cover 3 Fig 20 at the stand Release the supplemental brake at the C arm 2 Fig 20 completely Move the C arm into a vertical position Tighten the screw using a 17 mm Allen key 4 Fig 21 Adjust t...

Page 42: ...POLYMOBIL Plus SPR8 125 061 02 Page 20 of 20 Siemens AG Rev 01 01 00 TD SD 24 Medical Engineering 5 20 Measurements This page intentionally left blank ...

Page 43: ...nto the lowest position and check whether the safety mechanism bolt 1 Fig 1 is locked into position Now the stand cannot be moved upwards Remove the four Allen screws of the single tank generator cover 2 Fig 2 remove the cover disconnect the connections and the strain relief of the corrugated tubing 3 Fig 2 and remove it To repair paint chips the POLYMOBIL Plus colors can be ordered in spray cans ...

Page 44: ...quence Secure the three mounting screws 4 Fig 3 with Loctite 242 and tighten them Remove the fourth mounting screw from the threaded hole arrow Fig 3 and reinstall it in its former position Secure the screw with Loctite 242 Test the torque of the mounting screws Nom 25 Nm Tolerance 10 Reinstall the collimator in reverse sequence Set the tube current refer to Setting the tube current for the exposu...

Page 45: ... two knobs to the end position and remove them Remove the front panel after you have removed the two screws 7 Fig 6 Caution The front panel is connected to the collimator via a cable 9 Fig 7 Remove the collimator after removing the four Allen screws arrow Fig 4 5 Attach the new collimator with the four screws arrow Fig 4 5 and center it Reconnect the cables and the back panel Check the coincidence...

Page 46: ...ews 7 Fig 6 Caution The front panel is connected to the collimator via a cable 9 Fig 7 Remove both screws 10 Fig 7 and take off the metal bracket for the temperature switch Take out the defective lamp 11 Fig 7 and replace it with a new lamp Attach the bracket and the front panel Adjust both knobs and attach them Check the function of the light localizer lamp Check the considence of light and radia...

Page 47: ...cing the steering caster 6 Install in the reverse sequence Test the pedal positions Refer to Operating Instructions Step 1 Loosen only Allen screws on the left and right 2 5 mm wrench 2 Pull back hexagonal shaft 3 Remove pedal 4 Remove Allen screws wrench size 6 mm 5 Pull out the caster 6 Align the threaded holes on the new caster Fig 8 ...

Page 48: ...eplacing important components Replacing the capacitor bank 6 When working on the open system there is the danger of Electric shock The capacitor bank can still be charged Do not attempt to work on the system while this condition exists For details see chapter Prerequisites Fig 9 VCC R5 C1 R3 R4 WARNING ...

Page 49: ...ig 11 Remove one cover screw on each side 2 Fig 10 Unscrew the three Allen screws 2 Fig 11 Pull out the connectors X3 and X9 3 Fig 11 on the charging board D950 Remove flat ribbon cable X20 4 Fig 11 from the inverter board D960 and from the charging board D950 Disconnect and remove the cables of oscillating circuit capacitor C1 and oscillating circuit coil L1 to inverter board D960 Pull the entire...

Page 50: ...D SD 24 Medical Engineering 6 8 Replacing important components Assembly is performed in the reverse sequence Check the capacitor voltage Uc and the charging time refer to Capacitor voltage Uc and charging time page 5 3 SMS Iselin O Donnell TD SD 24 Am Ende TD SD 24 Groß ...

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