Bedienungsanleitung VHQ
Contents
1. Status register 2 and then Start voltage change via interface Maximum output voltage and current can be selected in 10 steps with the rotary switches Vmax 4 and Imax 5 switch dialed to 10 corresponds to 100 independently of programmable current trip The output voltage or current which exceed the limits is signaled by the red error LED on the front panel 6 Function of KILL switch 10 Switch to the right position The output voltage will be shut off permanently without ramp on exceeding Vmax ENABLE KILL Imax Or in the presence of an INHIBIT signal Low active at the INHIBIT input 11 Restoring the output voltage is possible after operating the switches HV ON or KILL or reading Status register 2 and then Start voltage change by DAC control Note When capacitance is effective at the HV output or when the rate of change of output voltage is high hardware ramp at high load then the KILL function will be released by the current charging the condenser In this case use a small rate of output change software ramp or select ENABLE KILL not until output voltage is set voltage Switch to the left position The output voltage will be limited to Vmax output current to Imax respectively DISABLE KILL INHIBIT shuts the output voltage off without ramp the previous voltage setting will be restored with hard or software ramp on INHIBIT no longer being present 6 VME Interface Modus short supervisor2. iseg Spezialelektronik GmbH Precision High Voltage Supply VME STANDARD series Operators Manual Contents as General information 2 Technical Data 3 VHQ Description 4 Front panel o1 Handling 6 VME Interface 7 Program example Appendix A Block diagram Appendix B Rotary switch locations Attention It is not allowed to use the unit if the covers have been removed We decline all responsibility for damages and injuries caused by an improper use of the module It is highly recommended to read the operators manual before any kind of operation Note The information in this manual is subject to change without notice We take no responsibility whatsoever for any error in the document We reserve the right to make changes in the product design without reservation and without notification to the users Filename VHQx0x ___ version 3 00 as of 24 09 2004 iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http Awww iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany a Lo Cg Spezialelektronik GmbH 1 General information The VHQ s are two channel high voltage supplies in 6U VME format 164 mm deep double width The units offers manual control and operation via VME bus The use of the VME interface supports more then the manual control functionality The high voltage supplies special provide high precision output
3. set channel B voltage to 350 V give the unit time to ramp read actual voltages AL allow fora new conversion ramp channels down set channel A voltage toO V set channel B voltage to 0 V Phone 49 351 26 996 0 Fax 49 351 26 996 21 10 VME BUS iseg Spezialelektronik GmbH Reference voltage soos Address decoder LCD display driver Data bus buffer Micro Controller Front panel switches 5V mer 12V Hardware voltage ramp Inhibit Hrer rectifier Supply voltage eS AGC amplifier monitoring Resonance converter Polarity HV Filter switch HV Transformer Rectifier RE tobe A Gay alge E y eg ga ae arg Paine a I l Channel B i l HV l OUTPUT l i B I I I I E A a eile E ts tee Bie i Appendix A Block diagram VHQ iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http www iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany 11 iseg Spezialelektronik GmbH Bautzner Landstr 23 D 01454 Radeberg Rossendorf seg Spezialelektronik GmbH POLARITY NEG Appendix B VHQ side cover Polarity rotary switch eg channel A Polarity negative channel B Polarity positive Email sales iseg hv de Phone 49 351 26 996 0 http www iseg hv com Fax 49 351 26 996 21 Germany 12
4. BA 0x28 DO D3 Maximal output current Imax in 10 hardware setting on the front panel switches D4 D7 Maximal output voltage Vmax in 10 hardware setting on the front panel switches D8 D15 0 Data ready BA 0x2C pz De DS fb4 b3 lt A EO jo lo fo o CurrentB_ Voltage B The individual bits are set as soon as actual measured data is existing The bits are reset after the corresponding reading command iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http www iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany 7 Z Seg Spezialelektronik GmbH Status register 2 BA 0x30 D15 REG2ER_2 Quality of output voltage not given at present Vmax Or Imax iS was exceeded Channel External inhibit was is active SON D11 KEY_CHANGED A frontpanel switch position was changed ON_OFF_2 B IN_EXT_2 KILL_2 EOP_2 Vout has reached set value End of process 2 D9 ILIM_2 lout WAS gt Imax programmable Current trip REG2ER_1 D REG1ER_1 D4 RANGE_1 Veet tO Vmax ratio gt 1 A BA 0x04 gt Vmax D3 KEY CHANGED _ A frontpanel switch position was changed ON_OFF_1 IN_EXT_1 KILL_1 EOP_1 Vout has reached set value End of process_1 D1 ILIM_1 lout WAS gt Imax programmable Current trip Do TOT sd Timeout error New initialisation The individual bits are set on the occurrence of the event A general clear is perfo
5. 0 turn potentiometer 7 This is also the case if VME control is switched over to manual control while operating If the CONTROL switch 9 is in lower position DAC high voltage will be activated only after receiving corresponding VME commands Phone 49 351 26 996 0 iseg Spezialelektronik GmbH Bautzner Landstr 23 D 01454 Radeberg Rossendorf Email sales iseg hv de http www iseg hv com Fax 49 351 26 996 21 Germany 4 a LS ecg Spezialelektronik GmbH On the LCD 1 output voltage in V or output current in A will be displayed depending on the position of the Measuring switch 3 For the two channel units one can choose with Channel switch 2 if channel A or channel B is displayed If working with manual control output voltage can be set via 10 turn potentiometer 7 in a range from 0 to the set maximal voltage If the CONTROL switch 9 is switched over to VME control the DAC takes over the last set output voltage of manual control Output voltage can be generated with a programmable ramp speed software ramp from 2 to 255 V s in a range from 0 to the maximal set voltage via VME control The maximum output current per channel can be set with a programmable current trip via the interface with the resolution of current measurement If the output current exceeds the programmable limit the output voltage will be shut off permanently by the software Restoring the voltage is possible after reading
6. 10 s or of setting another switch respectively the chosen base address is saved in EEPROM and the unit is responsive with it 6 Factory setting BA 0xDD00 Register addresses The description for Channel B will be cancelled at the one channel unit o o 0 Status registri Status register 4 0 register 1 POPORUL lt I N voltage Channel A Vsa lt Vma M ofofo 1 o o Setvoltage ChanneiBs M Set voltage Channel B Vsa lt Yes l ofo o 1 f1 o Ramp speed ChanneiA 2 255 V s Ramp speed Channel A 2 255 v s fo o 14 0 0 0 RampspeedChanneiB 2 255 V s Ramp speed Channel B T o aaa aae ofo 1 1 o o0 Actual voltage channeis M oo ojo 1 1 1 0 Actual current Channa of1fo o o o Actua currentcnanneis FO 4 O 0 4 o Hardware limits Channel A max Vead ooo lolilolifolo Hardware limits Channel B Imax Vmax o oft foli tfo bataready of1f1 o o o Status register 1 1 1 Start voltage change Channel A Start voltage change Channel A PCCE i ee rewera m 111 1 Start voltage change Channel B Start voltage change Channel B PEE enee G eae Olt 1 1 4 o Moduleidentier S l L Oe o aa a a l lolo loli o Current software limit Channel A Current software limit Channel A i lolo lilo o Current software limit Channel B Current software limit Channel B corresponding current resolution with data maximal current Channel A B corresponding current resolution maximal current 0 nota curr
7. ent trip iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http www iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany 6 a Lo Cg Spezialelektronik GmbH Status register 1 BA 0x00 rame fen rame pen o o HV ON OFF switch setting po nexe feonro smars one frena po N22 a News a Status Vout Vout Stable ae in change o ERO Ramp up down Vou falling KILL_1 KILL switch setting Disabled Enabled ON_OFF_1 _ HV ON OFF switch setting Polarity Vout Positive Di N EC CONTROL swich sting pasar BO WV1 Nowe iar E This register is representing the general status of the VHQ Error is formed by the logic or of REG2ER_ REG1ER_ EXTINH_ RANGE_ and ILIM_ from Status register 2 Vou 0 is formed by DAC output 0 and actual voltage lt 5 V Set voltage Channel A B BA 0x04 BA 0x08 Set voltage Vset from O to Vmax in V If Vser greater then Vmax BA 0x24 BA 0x28 Vset will be not changed Ramp speed Channel A B BA 0x0C BA 0x10 Voltage ramp speed from 2 V s to 255 V s All processor controlled changes in the output voltage are performed at this ramp speed Actual voltage Channel A B_ BA 0x14 BA 0x18 Output voltage Vour of the channels in V Actual current Channel A B_ BA 0x1C BA 0x20 Output current lout of the channels corresponding current resolution Hardware limits BA 0x24
8. f program terminating n return 1 printf both channels ON ok n if value_s amp 0x4 0 printf polarity of channel A is positive n else printf polarity of channel A is negative n if value_s amp 0x400 0 printf polarity of channel B is positive n else printf polarity of channel B is negative n sleep 1 value_s ushort base LIMITS_A vmaxa value_s amp Oxf0 gt gt 4 10 imaxa value_s amp OxOf 10 printf Vmax A 4d Imax A 4d n vmaxa imaxa sleep 1 value_s ushort base LIMITS_B vmaxb value_s amp Oxf0 gt gt 4 10 imaxa value_s amp OxOf 10 printf Vmax B 4d Imax B 4d n vmaxb imaxb ushort base RAMP_SPEED_A 100 printf ramp A set n ushort base RAMP_SPEED_B 100 printf ramp B set n ushort base SET_CTRIP_A 100 i printf Channel A current trip set n ushort base SET_CTRIP_B 0 printf Channel B current trip set n iseg Spezialelektronik GmbH Email sales iseg hv de Bautzner Landstr 23 http www iseg hv com D 01454 Radeberg Rossendorf Germany iseg Spezialelektronik GmbH read board id check on DAC manual switch setting check on HV ON OFF switch setting whats the output polarity read Vmax and Imax set ramp speed 100 V s set channel A software current trip to 100 HA channel B wit
9. hout software current trip Phone 49 351 26 996 0 Fax 49 351 26 996 21 ushort base START_VOLT_A 400 printf cChannel A voltage set n ushort base START_VOLT_B 350 printf cChannel B voltage set n sleep 5 value_s ushort base ACT_VOLT_A printf channel A is at d V n value_s sleep 1 value_s ushort base ACT_VOLT_B printf channel B is at d V n value_s printf press any key to ramp down and exit n getc stdin ushort base START_VOLT_A 0 sleep 1 ushort base START_VOLT_B 0 return 0 EEEE EEE vhq h ie header file for iseg vme hv boards P mki 24 1 96 BERER EERE EERE IEEE HERR IEER IEEE EERE KERR EERE IEEE EERE EER ERE ESE vhq registers define STAT_REG1 0x00 define SET _VOLT_A 0x04 define SET_VOLT_B 0x08 define RAMP_SPEED_A 0x0C define RAMP_SPEED_B 0x10 define ACT_VOLT_A 0x14 define ACT_VOLT_B 0x18 define ACT_CUR_A 0x1C define ACT_CUR_B 0x20 define LIMITS A 0x24 define LIMITS B 0x28 define STAT_REG2 0x30 define START_VOLT_A 0x34 define START_VOLT_B 0x38 define MOD_ID Ox3C define SET_CTRIP_A 0x44 define SET_CTRIP_B 0x48 define ushort unsigned short iseg Spezialelektronik GmbH Bautzner Landstr 23 D 01454 Radeberg Rossendorf Email sales iseg hv de http www iseg hv com Germany a Lo Cg Spezialelektronik GmbH set channel A voltage to 400 V
10. of the control circuit results in an output voltage stabilized with very high precision to the set point Separate security circuits prevent exceeding the front panel switch settings for the current Imax and voltage Vmax limits A monitoring circuit prevents malfunction caused by low supply voltage The internal error detection logic evaluates the corresponding error signals and the external INHIBIT signal It allows the detection of short overcurrent due to single flashovers in addition Digital control unit A micro controller handles the internal control evaluation and calibration functions of both channels The actual voltages and currents are read cyclically by an ADC with connected multiplexer and processed for display on the 4 digit LCD display The current and voltage hardware limits are retrieved cyclically several times per second The reference voltage source provides a precise voltage reference for the ADC and generation of the control signals in the manual operation mode of the unit The set values for the corresponding channels are generated by a 16 Bit DAC in computer controlled mode Filter A special property of the unit is a tuned filtering concept which prevents radiation of electromagnetic interference into the unit as well as the emittance of interference by the module A filtering network is located next to the connectors for the supply voltage and the converter circuits of the individual devices are also protected by filter
11. rmed after readout If the Output voltage was permanently switched off by exceeding Vmax OF Imax ENABLE KILL resp Current trip or INHIBIT respectively the error bits REG1ER_ EXTINH_ ILIM_ have to be reset by reading Status register 2 before an output voltage can be set again Start voltage change BA 0x34 Ba 0x38 A change in the output voltage of set voltage BA 0x04 BA 0x08 is performed by reading these registers Writing to the registers stores the data as new set voltage Veet lt Vmax and starts the voltage change The change of output voltage is blocked if the conditions are unavailable to start voltage change corresponding these description Command execution can be checked by reading status register 1 BA 0x00 The bits D14 channel B D6 channel A respectively are set on start of voltage change Actual voltage reaching the set voltage is flagged by the bits D10 D2 of status register 2 BA 0x30 respectively An interruption of the voltage change e g external INHIBIT is active is also ascertainable Module identifier BA 0x3C D15 DO 4 digit serial number BCD coded Current software limit BA 0x44 BA 0x48 The maximal output current per channel corresponding current resolution If the output current exceeds the programmable limit the output voltage will be shut off permanently by the software Current trip The Current trip reaction time is lessen to 60 ms Writing to the register
12. s The high voltage filters are housed in individual metal enclosures to shield even minimum interference radiation iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http www iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany 3 seg Spezialelektronik GmbH 4 Front panel VHQ 204L IrAVIImA 5 Handling 4 digit LCD display Channel switch Measuring switch Rotary switch Voltage limit Rotary switch Current limit Error indicator 10 turn potentiometer HV ON switch CONTROL switch KILL switch INHIBIT input HV ON indicator HV output Polarity indicator The state of readiness of the unit is produced at the VME connector on the flipside The Output polarity is selectable with help of a rotary switch on the cover side see appendix B The chosen polarity is displayed by a LED on the front panel 14 and a sign on the LCD display 1 Attention It is not allowed to change the polarity under power An undefined switch setting not at one of the end positions will cause no output voltage High voltage output is switched on with HV ON switch 8 at the front panel The viability is signaled by the yellow LED 12 Attention If the CONTROL switch 9 is in upper position manual control high voltage is generated at HV output 13 on the front panel with a ramp speed from 500 V s hardware ramp to the set voltage chosen via 1
13. s with maximal output current 0 not a current trip will be programmed Hardware maximum output current limit Ina worked independently of programmable current software limit iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http www iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany 8 7 Program example ERE EERE REE E ERIE ERE AKERRA AREER RE FERRER EERE EER ERE EERE EERE EERE EERE RE RES r r r r r vhq c SI example program for iseg vme hv boards tf mki 24 1 96 this code was compiled and run on an E6 under OS9 please contact iseg for the source files Ki EERE E RRR RIE IEEE IEEE IEEE FERRE EER FERRIER EERE EERE EER EREEES EE ER ERE EER ER ERE FREE include lt stdio h gt include vhq h define base OxFFFFDD0O int main ushort value_s ushort serial ushort imaxa imaxb vmaxa vmaxb value_s ushort base MOD_ID serial value_s gt gt 12 1000 value_s amp Ox0f00 gt gt 8 100 value_s amp 0x00f0 gt gt 4 10 value_s amp 0x000f printf This board is serial no d n serial value_s ushort base STAT_REG1 if value_s amp 0x202 0 printf one of the two channels is in manual mode n printf program terminating n return 1 printf both channels in DAC mode ok n if value_s amp 0x808 0 printf one of the two channels is OFF n print
14. ve gt Vour 0 NA programmable current limit software m VME 2 6U 164 mm deep 96 pin VME connector according to DIN 41612 SHV Connector at the front panel iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http www iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany 2 seg Spezialelektronik GmbH 3 VHQ Description The function is described at a block diagram of the VHQ This can be found in Appendix A High voltage supply A patented high efficiency resonance converter circuit which provides a low harmonic sine voltage on the HV transformer is used to generate the high voltage The high voltage is rectified using a high speed HV rectifier and the polarity is selected via a high voltage switch A consecutive active HV filter damps the residual ripple and ensures low ripple and noise values as well as the stability of the output voltage A precision voltage divider is integrated into the HV filter to provide the set value of the output voltage an additional voltage divider supplies the measuring signal for the maximum voltage control A precision measuring and AGC amplifier compares the actual output voltage with the set value given by the DAC computer control or the potentiometer manual control Signals for the control of the resonance converter and the stabilizer circuit are derived from the result of the comparison The two stage layout
15. voltage together with very low ripple and noise even under full load Separate 10 steps hardware switches put voltage and current limits An INHIBIT input protects connected sensitive devices Additionally the maximal output current per channel is programmable via the interface The high voltage outputs protected against overload and short circuit The output polarity can be switched over The HV GND is connected to the chassis and the powering GND 2 Technical data VHQ two channel Output current per channel lo with option M h a ae with option 104 ae e Stability AVo lt 5 10 idle to max load A Current trip reaction time lt 60 ms Power requirements Vineut 12V lt 850 mA with option M h lt 1 6 A 5V lt 300 mA AVo AV input lt 5 10 eo LCD Display 4 digits with sign switch controlled a Pee voltage display in V current display in uA Q e Current 1 uA with option 104 100 nA ox Voltage 1 V me av ur 4 0 05 lo 0 02 lo max 1 digit for one year ms 0 05 Vo 0 02 Vo max 1 digit for one year Voltage CONTROL switch in upper position 10 turn potentiometer EE lower position DAC control via interface 1 Li i Rate of change of hardware ramp 500 V s on HV ON OFF software ramp 2 255 V s ik Protection separate current and voltage limit o hardware rotary switch in 10 steps os es a INHIBIT ext signal TTL level 2 a Low acti
16. y access AM 0x2D short nonprivileged access AM 0x29 Control via VME interface 1 write set voltage ramp speed maximal output current current trip 2 switch output voltage set voltage output voltage 0 3 read set voltage actual voltage ramp speed actual current current trip current and voltage hardware limit status Front panel switches are having priority over software control Manual control While the unit is operated in manual control mode VME read cycles are interpreted only Commands are accepted but do not result in a change of the output voltage iseg Spezialelektronik GmbH Email sales iseg hv de Phone 49 351 26 996 0 Bautzner Landstr 23 http www iseg hv com Fax 49 351 26 996 21 D 01454 Radeberg Rossendorf Germany 5 seg Spezialelektronik GmbH Command Execution Time The command execution time is 2 us typical Base Address The base address BA is saved in a EEPROM Setting BA 1 Set both channels of the unit before power requirements 12V 5V are activated as follows gt CONTROL switch at MANUELL gt HV ON switch at OFF gt KILL switch at ENABLE 2 Activate power requirements 3 LCD display shows A on the left side and the highbyte of the base address e g dd on the right side with separator flashing in between 4 High order nibble can be set with channel switch and low order nibble with measuring switch 5 In case of no change for
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