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ATE 1/2 Rack (250W) Operator Manual

1. p 3 8 3 7 Two Terminal Resistance Programming of the Voltage Channel Using PREAMP A and the Internal Reference Source 3 8 38 Connections for Voltage Control With Two Terminals Resistance 3 9 39 Using PREAMP A to Generate the 0 10 Volt 1 mA Control Potential from a High Impedance Source 3 10 3 10 Connections for Voltage Control With a High Impedance Input Source 3 11 3 11 Connections for Output Current Control With a 0 1 Volt Control Signal Kepco SN 3 12 3 12 Two Terminal Resistance Programming of the Current Channel Using PREAMP and the Internal Reference Source 3 13 3 13 Connections for Output Current Control With a Two Terminal Resistance celere ee eee eee tenes 3 14 3 14 Remote Crowbar Level Control With an External Signal 3 15 3 15 Connections for Simultaneously Programming the Output Voltage and the Crowbar Level Automatic Tracking 3 16 3 16 Connections for Simultaneous Control of the Output Voltage Output Current 3 17 3 17 Illumination Control Circuit With the ATE Power 3 19 3 18 Connections for Illumination Control Using the EXT CURRENT COMPARISON AMPLIFIER hm
2. 2 3 48 If lg is selected to be 1 mA for example Control Currents from approximately 0 1 to 1 mA can be selected a O to 10K ohm reostat decade or other variable resistance will produce the required 0 10 volt control potential and thereby control the ATE output voltage from zero to its maximum rated value 0 10K ohm voltage control resistance is not available the contro current Ip can be changed to accommodate the available resis tance value making use of the preamplifier output equation Eq 2 If for example a 15K ohm precision potentiometer is available the control current lp must be 10V 15KQ 0 66 mA Since the built in INT REF SOURCE is a nominal 6 2 volt the external R must be 6 2V 0 66 mA 9 4KQ which can be made up from a 8KQ fixed and a 2KQ trim resistor 15 CAL 3 49 PROCEDURE VOLTAGE CONTROL WITH A TWO TERMINAL RESISTANCE 1 Connect the external components the LOAD and the PRECISION VOLTMETER M1 to the ATE as shown in FIG 3 8 2 With the EXT VOLTAGE CONTROL at zero ohms turn the ATE on 3 Vary the EXT VOLTAGE CONTROL from zero ohms to its maximum resistance The ATE output voltage as read out on M1 should vary from approximately zero volts to its rated maximum value Return the EXT VOLTAGE CONTROL to its zero ohm position D DC OUTPUT a e I OUT MI UHT cro Q VOLTMETER REMOVE LINKS o
3. AC SOURCE INPUT TO AC INPUT 5 ut SOURCE 1 2 RACK ATE POWER SUPPLY FIG 3 2 STANDARD JUMPER LINK CONNECTIONS FOR LOCAL FRONT PANEL CONTROL OF THE OUTPUT VOLTAGE OUTPUT CURRENT AND VP CROWBAR LEVEL SLOW MODE ATE 1 2 2578 33 3 1 LOAD CONNECTION METHOD LOCAL ERROR SENSING Ru Refer to FIG 3 3 The most basic power supply interconnection to primarily resistive relatively constant loads located close to the power supply or for loads requiring stabilized current exclusively consists of 2 wire connection from the rear output terminals Load wire is selected as described previously refer to par 3 15 The load leads should be tightly twisted to reduce pick up from stray magnetic fields After the grounding rules have been applied refer to par 3 3 to 3 11 the power supply can be connected to the a c source and operation may commence AC SOURCE INPUT AC INPUT 150 491 SOURCE XXo mz 1 2 RACK ATE POWER SUPPLY FIG 3 3 LOAD CONNECTION METHOD 1 LOCAL ERROR SENSING 3 21 LOAD CONNECTION METHOD REMOTE ERROR SENSING 3 22 To avoid excessive output effects at remote loads error sensing must be used A twisted shielded pair of wire from the sensing terminals directly to the load will compensate for toad wire voltage drops up to 0 5 volt per wire refer to FIG 3 4 Observe polarities The negative sensing wire must go to the negative load wire and
4. PROGRAMMING SOURCE K ATE POWER SUPPLY 2 RAC FIG 3 15 CONNECTIONS FOR SIMULTANEOUSLY PROGRAMMING THE ATE OUTPUT VOLTAGE AND THE CROWBAR LEVEL AUTOMATIC TRACKING 1 For operation with the ATE in FAST mode all connections shown in FIG 3 15 are valid for both SLOW and FAST operating modes except as follows 1 Connect 51 and 100K ohm resistor to PC 12 pin 11 not pin 13 2 Do not add jumper 9 11 on PC 12 3 Remove only jumpers 2122 and 11 13 not jumper 1328 on PC 12 4 In paragraph 3 77 Step 4 connect jumper between pins 11 and 21 not between 13 and 21 ATE 1 2 2578 3 78 PROGRAMMING THE OUTPUT VOLTAGE AND THE OUTPUT CURRENT SIMULTANEOUSLY BY MEANS OF EXTERNAL REMOTE CONTROL VOLTAGES 3 79 The output voltage and the output current of the ATE power supply can be controlled simultaneously by means of remotely located variable voltage sources The control voltages required to drive the voltage and current channels over the rated output range are 0 to 10 volt at 1 mA for the Voltage Channel and 0 to 1 volt the Current Channel An ideal programming source is the Kepco SN 488 Digital Programming System which provides two independent control voltages of the correct magnitude per programming card NOTE FOR CONTROL SOURCES NOT WITHIN THE GIVEN SPECIFICATIONS THE TWO PREAMPLI FIERS MAY BE USED AS DESCRIBED IN PAR S 3 45 TO 3 56 AND 3 64 TO 3 69 T
5. In slow mode the leakage current through the output capacitor adds approximately 0 6 mA to the current mode load effect 2 termina must be grounded for this measurement or connected so that common mode current does not flow through the load or in current mode through the current sensing resistor 3 Peak to peak ripple is measured over 20 Hz to 10 MHz bandwidth 4 Preamplifier offsets The preamplifier offsets are given for the calculation of the output effects of preamplifiers A B if either cf these amplifiers is used for operational programming In this case the value of the external feedback and input resistors the amplifier offsets and the reference voltage variations are combined in the Error Equation which represents the worst case output effects for the application at hand AEo preamp AEret RERI AEjg 1 Rf Total Preamp Output Voltage Change where AEo preamp Change in the Voltage Reterence ref AEio Changa in Offset Voltage Alig Change in Offset Current External Feedback Resistor Ri External Input Resistor NOTE 1 Variations in the value of the feedback and input resistors are considered secondary effects In the error equation NOTE2 inthe Voltage Mode of operation the calculated preamp output effect AEo preamp must be multiplied by the fixed gain of the ATE voltage channel to find the total output effect on the output voltage of the ATE power sup
6. reading and correct if necessary with the ATE ZERO control 2 Set the MODEL 53 488 input to 10 volts Observe M1 and calibrate the ATE output voltage to the exact maximum rated output voltage by means of the SN 488 calibration control 3 Set the MODEL SN 488 output to zero again and check the previously calibrated zero point on 1 Correct with the ATE Eo ZERO control if required 4 Set the ATE front panel CURRENT CONTROL according to your load requirements following the procedure given in 3 28 2 3 4 5 use one of the output current programming circuits for remote control of the output current as described in PAR s 3 60 3 64 2 12 TB20 OO DC OUTPUT REMOVE JUMPER ES 3i K C OUT 21 22 ON PC 12 IO i MI LOAD ety oom 14 13 JOUT ise 2M VI 18 17 DIGITAL KEPCO SRO VOLTMETER 488 2423 M REMOVE LINKS pietat 0 St 2 3 AND 8 6 PROGRAMMER 30 294 ws e le T8201 2 sil L a 134 339 136 351 INS 7 4 I 40 39 SEMEL SN N WIES 143 451 SID nasi He zy m SOURCE 1 2 PACK ATE POWER SUPPLY 218 3 6 OUTPUT VOLTAGE CONTROL WITH AN EXTERNAL 0 10V 1 mA D C CONTROL SIGNAL VOLTAGE CONTROL WITH A TWO TERMINAL RESISTANCE As mentioned previously refer to PAR s 3 39 3 40 a wide variety of external programming sou
7. 2 3 VOLTAGE RECOVERY FOR A STEP LOAD CURRENT The time required for the stabilized output voltage to recover to within 10 mV of the output voltage setting for a 10 to 100 step in rated load current is typically less than 50ysec 100 maximum CURRENT RECOVERY FOR STEP LOAD VOLTAGE The stabilized output current recovers from a step in load compliance voltage with an ex ponential response the time constant of which is determined by the load resistance and the tabulated output capacitance See Table 1 1 PROGRAMMING SPEED The speed with which the power supply output responds to external programming signals is determined by 1 The PROGRAMMING TIME CONSTANT 7 given in the slow mode by either the load resistance R and the value of the output capacitor C see Table 1 1 7 R O or by the FEEDBACK TIME CONSTANT given by the product of the feedback capacitor and the feed back resistor whichever is greater In the fast mode the PROGRAMMING TIME CONSTANT and bandwidth 3dB for the Voltage Control Channel is shown in the table Programming Output Bandwidth Time Constant Voltage 3dB KHz For the Current Control Channel the PROGRAMMING TIME CONSTANT is 25 sec typical 50ysec maximum 80usec for the ATE 325 0 8M 2 The MAXIMUM RATE OF CHANGE that the power supply output can respond to is given by the setting of the power supply s current control setting lh divided by the
8. PREAMP A FEEDBACK Rf int GATE DRIVE SIGNAL Eom RI VOLTAGE COMPARISON AMPL OUTPUT VOLTAGE FROM MASTER SUPPLY COMMON PART OF ATE SLAVE SUPPLY u gt a el ras FIG 3 23 DEVELOPING THE DRIVE FOR THE MASTER SLAVE SERIES CONNECTION FOR 6V ATE SUPPLIES 3 102 ATE power supplies with 6 volts maximum output voltage cannot be master slave connected as described in par 3 97 Instead the MASTER output voltage 6V must first be amplified to 10 volts if the SLAVE supply is to be driven through its full output voltage range As seen from FIG 3 23 one of the preamplifiers of the slave unit may be used to proportion the drive signal to the required level For a 0 1mA control current Ip the input voltage Ej to the VOLTAGE COMPARISON AMP must be 0 10 volt Therefore the MASTER output voltage Eom is amplified using PREAMP by selecting the value for the external resistors Re Rj accord ingly The values for these resistors are calculated on the basis of the equation Egy preamp Eom x R4 Rj R For the example of two 6 volt ATE supplies in series connection 6V therefore R Rj the closed loop gain of PREAMP must be 6 x R R 10 or amp 1 Letting R Rj must be approximately 5K ohms may be selected to be a rheostat so that a convenient gain contro is available for calibration 3 103 PARALLEL OPERA
9. 3 20 Series Operation of ATE Power 5 3 21 Parallel Operation of ATE Power Supplies 3 25 Programming With Reference to the NEGATIVE Power Supply 3 32 Application of Isolated Flag Signals VINCE 3 34 ATE 1 2 3 4 FULL e LIST OF ILLUSTRATIONS FIGURE PAGE 1 1 Kepco ATE Power Supplies v vi 1 2 Mechanical Outline Drawing 1 7 1 8 2 1 Location of Internal Controls 2 1 2 2 Controls and Terminations 2 2 2 3 Terminations Rear sy Nee dre beanie p nex Red 2 3 2 4 A C Input Source 2 4 2 5 Required Steps for Slow Mode Fast Mode 2 6 3 1 Typical Output Impedance hr hme 3 2 32 Standard Jumper Link Connections one ect Sa EE 3 3 3 3 Load Connection Method l cse oase ae b Ae 3 4 3 4 Load Connection Method scu oes e kona 3 4 3 5 Load Connection Method H1 3 5 346 Output Voltage Control With an External 0 10 Volt 1 mA D C Control Signal
10. es ON 78201 Co ING ext Rr 5 7 K ext Ib 2k REMOVE JUMPERS AC SOURCE 7 8 AND 21 22 INPUT ON 12 4 G ADD JUMPER 7 21 ON 12 9 N WINE LS d 150491 B TO AC INPUT SOURCE 1 2 RACK ATE POWER SUPPLY FIG 3 8 CONNECTIONS FOR VOLTAGE CONTROL WITH A TWO TERMINAL RESISTANCE ATE 1 2 2578 3 9 3 50 CALIBRATION Refer to Section H FIG 2 1 for the location of a f internal controls 1 Check the PRECISION VOLTMETER M1 for zero reading and correct if necessary with the PREAMP A ZERO control 2 Set EXT VOLTAGE CONTROL to its maximum resistance Observe M1 and calibrate the ATE output voltage to the exact maximum rated value by adjusting the EXT lp CAL control 3 Set EXT VOLTAGE CONTROL to zero ohms again re check the previously calibrated zero point on 1 and correct with the PREAMP A ZERO control if required 4 Set the ATE front panel CURRENT CONTROL according to the LOAD requirements following the procedure given in PAR 3 28 2 3 4 5 or use one of the output current programming circuits for remote control of the output current as described in PAR s 3 60 or 3 64 Set the overvoltage protector as described in PAR 3 31 5 Operation can now proceed Check the ATE power supply output by means of an oscilloscope for dynamic stability and output ripple amplitude Refer to PAR 3 6 if high ripple is present If the power supply output is
11. 3 37 3 38 339 3 40 3 41 3 42 343 INTRODUCTION TO REMOTE CONTROL OF THE ATE OUTPUT GENERAL REFER TO THE FOLD OUT DRAWING AT THE END OF THIS SECTION For local front panel control the VOLTAGE CONTROL CHANNEL the CURRENT CONTROL CHANNEL and the OVER VOLTAGE PROTECTOR of the ATE are locally adjusted by means of their respective front panel controls with the jumper connections on the REAR PROGRAMMING CONNECTOR as shown The internal control voltages for the VOLTAGE and CURRENT CONTROL CHANNELS are created by their individual control amplifiers while the OVERVOLTAGE PROTECTOR crowbar level is adjusted by a potentiometer connec ted across the 15 volt supply By disconnecting the internal control sources at the REAR PROGRAMMING CONNECTOR and substituting remote control circuitry the ATE VOLTAGE and CURRENT CONTROL CHANNELS as well as the OVER VOLTAGE PROTECTOR crowbar level can be programmed externally Control can be exercised individually or simultaneously on all three programming channels although individual programming will be illustrated and discussed in the following paragraphs PROGRAMMING THE VOLTAGE CONTROL CHANNEL GENERAL The ATE output voltage which is controlled by a front panel VOLTAGE CONTROL in the Local control mode can be remotely controlled by disconnecting the internal VOLTAGE CONTROL AMPL at the REAR PROGRAMMING CONNECTOR PC 12 and substituting an external control signal at the input of the
12. I0V 8 ease oe 5 w 21 Ri Ra PREAMP A PREAMP 19 Rb E Ea Eb i0 V to IV 0 10 30 z x s FIG 3 29 PROGRAMMING WITH REFERENCE TO THE NEGATIVE OUTPUT SIDE OF THE ATE Definition of Symbols in FIG 3 29 Eg Power Supply Output Voltage Eg PREAMP A Output Voltage PREAMP B Output Voltage ED Common Mode Voltage Limit 10 Volts max Programming Voltage ae Voltage Divider Network Rp 3 32 ATE 1 2 2578 3 118 Component selection will depend on the parameters of the programming source and the ATE power supply output voltage AN EXAMPLE An ATE model with an output voltage of 0 100 Volt is programmed through its full output voltage range by a programming source Ej of 0 10 volt which can supply 0 17 The negative output side of the ATE is grounded Selecting the voltage divider R4 Rp such that the common mode voltage Ep lt 10V we let 1M onm Rp Rp 100K ohm In this case the output voltage for PREAMP A can be expressed by Eg Ep 0 to 1 volt Note The equation for the standard differential amplifier is derived in Burr Brown s Operational Amplifiers 3 119 The next step is to select the input resistor ext and the feedback resistor ext for PREAMP B Since an input voltage of O to 10 volts is required to drive the VOLTAGE COMPAR
13. MO HOIH ONY ONISNJS esa 20 OVI LaVEOHOLIMS 30143224 325705 1ndMi Ov Lj m 9 tota e 59 5 o mat 301934409 22 2 zea g 02 141 DNISN38 WOLINOR 104160 1 YOLINOM 160410 f ONIEN2S 7 ot 43545 MORD ONV DNISN3S 444 FIG 1 2 MECHANICAL OUTLINE DRAWING 1 7 1 8 ATE 1 2 2578 SECTION II INSTALLATION 2 1 UNPACKING AND INSPECTION 2 2 This instrument has been thoroughly inspected and tested prior to packing and is ready for operation After careful unpacking inspect for shipping damage before attempting to operate Perform the preliminary opera tional check as outlined in paragraph 2 8 below If any indication of damage is found file an immediate claim with the responsible transport service 2 3 TERMINATIONS a FRONT PANEL Refer to FIG 2 2 and Table 2 2 b REAR Refer to FIG 2 3 and Table 2 3 c INTERNAL CONTROLS Refer to FIG 2 1 and Table 2 1 REFERENCE DESIGNATION CONTROL PURPOSE lg MAX Maximum Output Current Eg LAG Voltage Channel Stability Control Eg ZERO Voltage Channel Zero Control lg ZERO Current Channel Zero Control PREAMP ZERO Offset Zero Control for PREAMP A PREAMP B ZERO Offset Zero Control for PREAMP TABLE 2 1 INTERNAL CONTROLS AND THEIR FUNCTIONS R35 Io ZERO R27 Eo LAG V MODE
14. R67 PREAMP A ZERO 68 PREAMP ZERO VM CC Cox NI REAR PROGRAMMING CONNECTOR PC 12 216 2 1 LOCATION OF INTERNAL CONTROLS ATE 1 2 RACK GROUP ATE 1 2 2578 2 1 FIG 2 2 CONTROL AND TERMINATIONS ATE 1 2 RACK GROUP FRONT CONTROL OR TERMINATION FUNCTION VOLTAGE CONTROL A C POWER SWITCH CIRCUIT BREAKER ADJUSTS OUTPUT VOLTAGE FROM ZERO TO E max SERVES AS A C POWER SWITCH AND TURNS A C POWER LINE OFF ON OVERLOAD m V MODE INDICATOR ENERGIZES IN VOLTAGE MODE VOLTMETER MONITORS OUTPUT VOLTAGE 0 E max AMMETER MONITORS OUTPUT CURRENT 0 1 max I MODE INDICATOR LEVEL CONTROL CROWBAR INDICATOR DISARM PUSH BUTTON CURRENT CONTROL ENERGIZES IN CURRENT MODE ADJUSTS TRIGGER LEVEL OF CROWBAR CIRCUIT LIGHTS WHEN CROWBAR IS TRIGGERED ON PUSH TO SET CROWBAR TRIGGER LEVEL ADJUSTS CURRENT FROM 0 100 I max gt TABLE 2 2 CONTROLS AND TERMINATIONS ATE 1 2 RACK GROUP FRONT 2 2 ATE 1 2 2578 FAN EXHAUST AREA DO NOT OBSTRUCT REAR MATING CONNECTOR PC 12 FOR EXTERNAL PROGRAMMING SOURCE INPUT AND ALL OTHER PROGRAMMING FUNCTIONS REAR BARRIER STRIP 201 1 Co 5 OUTPUT MONITOR 2 SENSING 6 SENSING 3 OUTPUT MONITOR 7 Cg 4 GROUND CHASSIS 3 GROUNDING NETWORK A C POWER INPUT ACCEPTS A C INPUT CORD SUPPLIED DC OUTPUT TERMINALS L
15. covers are constructed from cold rolled stell The front panels are made from aluminum refer to the Mechanical Outline Drawing FIG 1 2 ATE A E 2078 1 2 1 1 1 9 SPECIFICATION ELECTRICAL al AC INPUT SOURCE VOLTAGE AC INPUT SOURCE CURRENT 95 to 113V a c Selectable Worst Case 113V a c 95 113V tap Full Load 105 to 125V ac gt See Section SIZEA SIZE SIZE C SIZED SIZEE 14A 24 6 0A 11 0 20 0 190 to 226V of this Manual 210 to 250V a c OUTPUT IMPEDANCE CURRENT MODE SHUNT SHUNT CAPACITANCE RESISTANCE SLOW FAST b DC OUTPUT RATINGS See Table 1 1 Size A Quarter Rack Models d c OUTPUT OUTPUT IMPEDANCE VOLTAGE MODE RANGE VOLTS AMPS SERIES SERIES INDUCTANCE RESISTANCE SLOW FAST a 6 5M __ 0 6 0 5 24 0 0 15 0 3 100 05 S H 30 450uF 0 4 uF ATE 25 2M aoa Tan wat anaE Tos ATE 36 1 5 0 36 _480 0 uH 72 2002 0 2uF Free 55 1 0 55 24H 20 H toko 150 F 0 15 F ATE 75 0 7 9 75 0 07 100 0 5 0 100 0 0 5 4 003 Size B Quarter Rack Models d c OUTPUT OUTPUT IMPEDANCE VOLTAGE MODE OUTPUT IMPEDANCE CURRENT MODE RANGE SERIES SERIES INDUCTANCE SHUNT SHUNT CAPACITANCE VOLTS AMPS RESISTANCE SLOW FAST RESISTANCE Stow FAST o oio 12
16. external control source IN ALL CURRENT PROGRAMMING APPLICATIONS THE FRONT PANEL CUR RENT CONTROL SETTING OF THE ATE ACTS AS A BACK UP CURRENT LIMIT AND MUST BE SET SLIGHTLY HIGHER THAN THE REQUIRED MAXIMUM OUTPUT CURRENT An application demonstrat ing this control method is described in PAR 3 60 and illustrated in FIG 3 11 If the available programming source does not have the required amplitude or polarity one of the ATE s uncom mitted preamplifiers may be used to cale the programming source to the required control potential 0 to 1 volt or provide the correct polarity Typical examples of some possible applications are provided in the follow ing paragraphs OUTPUT CURRENT CONTROL WITH AN EXTERNAL 0 TO 1V CONTROL SIGNAL An interesting example of direct drive method is the control of the ATE output current by means of a Kepco SN 488 Digital Programmer The SN 488 responds to digital input signals is EEE 488 bus compatible and can be addressed either by a computer or manually by means of a keyboard The attenutated output signal of the SN 488 is a voltage from zero to 1 volt and constitutes the input program for the ATE current channel Since the SN 488 has two independent outputs A B and only one is needed for current control the other output may be used to contro the ATE output voltage See par 3 41 PROCEDURE OUTPUT CURRENT CONTROL WITH AN EXTERNAL 0 1 VOLT D C CONTROL SIGNAL 1 Connect the EXT CONTROL VO
17. he rase 3 20 3 19 Multiple Power Supply Fault Detection Loop p 3 21 320 Automatic Series Connections ha aha 3 22 3 21 Developing the Drive for Master Slave Series Connection ATE Power Supplies With More Than 6 Volt Output 3 23 3 22 Master Slave Series Connection ATE Power Supplies With gt 6 Volt Output Voltage ee R9 3 e hc at ht 3 24 3 23 Developing the Driver for Master Slave Series Connection for 6 Volt ATE S pplles r ei Ta Ras art A EU E Ies x Ee 3 25 3 24 Automatic Parallel Operation Output 3 26 3 25 Connections for Automatic Parallel Operation 3 27 3 27 Location of the Overvoltage Sensing Lead Disconnect 3 30 3 28 Redundant Parallel Connection ee 0 eee eee 5 5 3 31 3 29 Programming With Reference to the NEGATIVE Output of the ATE 3 32 3 30 Connections for Programming With Reference to the NEGATIVE Output of the ATE ee ene Oman 3 33 3 31 isolated Flag Signal Outputs 0 2 3 34 ATE 1 2 3 4 FULL TABLE 1 1 D C Output Ratings ATE Power Supplies 1 2 Output Effects Offset Variations and Ripple Specifications 2 1 Internal Controls and Their Functions 2 2 Controls and Terminations Front Panel 2 3 Rear Terminations ATE 1 2 3 4 FULL LIST O
18. pairs etc pick up radiated noise of a wide frequency spectrum To minimize these undesired effects one side of the power supply output load circuit should be grounded Successful d c grounding depends on careful analysis of the individual situation and only general guide lines can be provided here One of the major points however is to avoid GROUND LOOPS Ground loops are created when two or more points are grounded along the output circuit Due to the wire impedance between the separated grounded points a noise voltage is developed which subsequently is superimposed on the load The only way to avoid ground loops is to investigate the output circuit including the connected load carefully by means of an ohmmeter for any resistance to ground A single d c ground point can be selected only if the output circuit is completely isolated a single point is selected along the power supply output load circuit and this point is returned to ground with a single wire The exact location of this best d c ground point is entirely dependent on the application at hand For single isolated loads the d c ground point may be located directly at one of the output terminals of the power supply which may be connected to ground If error sensing is employed d c ground can be established at the remote load In case of an internally grounded load the d c ground is automatically established directly at the load ATE Power Supplies have one side of the output r
19. rear programming connector 12 One of them signals the ATE operating mode Voltage or Current Mode the other one provides a signal to indicate that the ATE crowbar has been tripped Both flag signals consist of the Collector Emmitter terminals of a Photo Transistor Optical Isolator and change their impedance from high to low if activated The ATE signals may be con verted to TTL logic signals as indicated in FIG 3 31 The photo transistors capable of sinking at least one 1 standard TTL load 1 6mA Since the crowbar flag signal is followed by the shut down of the ATE power supply the flag signal is the form of a pulse rather than a permanent level shift PART OF PART OF PC I2 lt 4 ASS Y At ATE LOW CROWBAR MOMENTARY HIGH CROWBAR Orr CROWBAR FLAG 43 PART OF ATE ASS Y 1 LOW CURRENT MODE 50 HIGH VOLTAGE MODE MODE FLAG 49 COMMON FIG 3 31 ISOLATED FLAG SIGNAL OUTPUTS 3 34 ATE 1 2 2578
20. the positive sensing wire goes to the positive load wire NOTE For long wire runs twisting each sensing wire with its associated load wire may give improved results in some cases FIG 3 4 LOAD CONNECTION METHOD USING REMOTE ERROR SENSING ATTENTION When using remote error sensing with large capacitive loads and long load and sensing wires low frequency oscillations may be observed at the load To eliminate the problem the FEEDBACK CAPACITOR should be disconnected from the OUTPUT SEN SING terminal and reconnected to the OUTPUT MONITOR terminal Remove jumper 1 2 on the REAR PROGRAMMING CONNECTOR Connect a short wire from pin 2 to the REAR BAR RIER STRIP TB201 3 5j te TO AC INPUT SOURCE X20 mz 150 491 1 2 RACK ATE POWER SUPPLY 3 23 This method of load interconnection is suitable for loads which do not require rapid changes in voltage or current or for programming with gradually changing waveforms sine wave triangular wave shapes etc See par 3 24 for load connections suitable for rapid step changes in the load or in programming 3 4 ATE 1 2 2578 3 24 LOAD CONNECTION METHOD 3 25 This method is suitable if step changes in the load are expected if for example the load is rapidly changing in 3 26 value or if the power supply is programmed with step functions square wave pulse etc and maximum dynamic performance is expected d
21. to a lesser extent the feedback capacitor of a power supply control the programming speed and the current mode recovery time The removal of these capacitors in the fast mode results in greatly improved power supply performance in these areas The power supply s dynamic stability however is reduced making the output sensitive to the load phase angle For this reason the load presented to the power supply in the fast mode must not contain excessive capacitance limit 1000pF Also with the output and main feedback capacitors removed there will be an increase in output noise mainly high frequency noise and pick up so that external shielding of programming leads and good grounding practices assume added importance in the fast mode of operation LAG NETWORK ADJUSTMENT The ATE power supply operating in the fast mode is dynamically stabil ized by means of an internal lag network Eg LAG R27 see FIG 2 1 for location This control should be adjusted for each application by monitoring the load with an oscilloscope and turning the LAG control for best output response and maximum dynamic stability under all operating conditions CROWBAR OPERATION FAST MODE The crowbar circuit in the ATE power supply is not completely removed in the fast operating mode but continues to offer protection against dc voltage surges which may harm the load NOTE For fast mode operation into a load interrupted by contac tors or relays Arcing Load
22. uu ON dem v e Eee eat EX DA EA UE 1 5 1 6 NE ERTEILEN 1 5 1 6 SECTION Il INSTALLATION npacking and ction sac ream ER h a p e ee ai 2 1 Terminatlons iuo Sy RC xar E dn eu Cera e es WY ea 2 1 A G Input Requirements ren u l t u naa u i 2 4 COOLING s 252 dod avit etes Sh wr aeree bre a Q he te TP inte at Sus 2 4 Preliminary Check Out 4 loa ac RR S Ow bos ele aras RR NORTE de 2 4 InstallatiODt cioe eru ee RB ela to hee lols esos rre e aS BU eu de dede 2 5 Grounding s d xut veo we SSO Awe Mur Nene We 2 5 Fast Mode Conversion of the ATE Power 2 5 SECTION OPERATION General x2 eee dU A C ted a b e AO es ee d nina E 3 1 Safety Grounding a res 3 1 BE sir Gb eI Ae hale alee ad HE A eae Bat 3 1 Power Supply Load Interface 3 2 Load Connection General I e Bence guano Y era SU 3 3 Load Connection Method Local Error 3 4 Load Connection Method 11 Remote Error 3 4 Load Connections Method MI irs ue Due Rag E OR ew 3 5 Standard Voltage Mode Operation Front Panel Control 3 5 Standard Cur
23. 0 12ko 1800F 2 0 15 0 6 so 0 05 H 1000 uF 34 Tate 25 4 0 25 0 85 ATE36 3M __ 0 36 0 3 24020 10 72 3504F 0 4 uF 0 2 0 100 0180 0207 4 45H aoa sso 008 OUTPUT OUTPUT IMPEDANCE VOLTAGE MODE OUTPUT IMPEDANCE CURRENT MODE RANGE SERIES SERIES INDUCTANCE SHUNT SHUNT CAPACITANCE VOLTS AMPS RESISTANCE SLOW FAST RESISTANCE SLOW FAST d c QUTPUT OUTPUT iMPEOANCE VOLTAGE MODE OUTPUT IMPEDANCE CURRENT MODE motet RANGE SERIES SERIES INDUCTANCE SHUNT SHUNT CAPACITANCE VOLTS AMPS RESISTANCE SLOW FAST RESISTANCE SLOW FAST 0 50 24 2000 F 104F ATE 16 25 ATE 25 20M ATE 96 75 ATE 15 25M 12 5 30kn 8 0002 4 uF ATE 25 20M 0 25 25 0 0 H 50kn 5 800 F 255F 0 36 10 H 4900 F 2 oF 55 10 0 5 0 10 0 10 011 2 H 20 H 2 900 EAE RE PM 1 200 uF ATE 100 5 0 100 0 5 4 H 40 200kn amp 00 F 5 ATE 0 180 0 35 036 ma 405 MOF 025 T Size E Full Rack Models OUTPUT IMPEDANCE VOLTAGE MODE QuTPUT IMPEDANCE
24. 488 output to 1 volt Observe M1 and calibrate the ATE output current to the exact m ximum rated output current by means of the SN 488 calibration control 3 Set the Model SN 488 output to zero again and check the previously calibrated zero point on 1 Correct with the ATE 15 ZERO control if required 4 Set the ATE front panel VOLTAGE CONTROL according to your load requirements or use one of the output VOLTAGE programming circuits for remote control of the output VOLTAGE as described in PAR s 3 37 through 3 56 364 OUTPUT CURRENT CONTROL WITH A TWO TERMINAL RESISTANCE 3 65 In this control mode one of the ATE s preamplifiers is used in conjunction with one of the ATE s reference source to produce the 0 to 1 volt control signal The external feedback resistor serves as the two termina l external current control O To IK PART OF PC i2 5 15 4 Alo 4 P4 Rcc EXTERNAL CURRENT CONTROL TO CURRENT SENSING TO DRIVER CIRCUIT ext Rr JEn dde 5 7K EXT CURRENT t COMPARISON AMPLIFIER Eiz0 V PREAMPL text Ib CAL INT REF SOURCE 17 6 2V ImA 12 AT PET PART OF FIG 3 12 TWO TERMINAL RESISTANCE PROGRAMMING OF THE CURRENT CHANNEL USING THE PREAMPL AND THE INTERNAL REFERENCE SOURCE COMMON _ 3 66 Refer to FIG 3 12 The preamplifier functions here the inverting configuration producing its ou
25. 578 3 97 3 98 MASTER SLAVE SERIES OPERATION in this mode of operation the total output voltage of all supplies in the series connection is controlled from a common Master supply while the voltage output of the Slave supplies follow the output voltage of the Master As seen from the diagram FIG 3 21 in each SLAVE supply the input to the VOLTAGE COMPARISON AMP is disconnected from the output of the VOLTAGE CONTROL amplifier and an external drive signal is derived from the output voltage of the MASTER supply Eom and applied via a coupling resistor R4 to the SLAVE supply lau int Ri int IOK Rt t 0 8 O GATE VOLTAGE DRIVE SIGNAL COMPARISON AMPL Eom PART OF ATE SLAVE SUPPLY 216 3 21 DEVELOPING THE DRIVE FOR THE MASTER SLAVE SERIES CONNECTION ATE POWER SUPPLIES WITH RATED OUTPUT VOLTAGE gt 6V 399 The output voltage of each SLAVE supply Egg will be from to its maximum rated output voltage if the input signal to its VOLTAGE COMPARISON Ej is proportioned to produce a control current 4g of 1mA Since the null junction voltage E equals zero at balance ib Eom 2 or R Eom Ri R int lp lp Since lp 1mA 10K ohm in all ATE power supplies Ry ohms 10K m For example if a series connection of two ATE supplies with maximum output voltage of 36 and 55 volts is planned for an app
26. ATE output capacitor Cs see Table 1 1 MAXIMUM RATE OF CHANGE liy C OVERVOLTAGE CROWBAR SPECIFICATIONS 1 2 3 4 TRIGGERING TIME lt 50ysec slow mode 500ysec fast mode SETTING RANGE 1 6 or 3V whichever is greater minimum to 110 of the maximum rated output voltage for each model THRESHOLD Minimum 0 5 volts or 2 E whichever is greater TEMPERATURE COEFFICIENT 0 0295 of E per C ATE A E 2078B 1 10 MISCELLANEOUS FEATURES a 5 d CONTROL PROGRAMMING 1 VOLTAGE CHANNEL Output voltage is controlled continuously throughout the range by a panel mounted 10 turn rheostat External control can be exercised by resistance or by a control voltage See Section lil 2 CURRENT CHANNEL INTERNAL Output current is controlled continuously throughout the range by a panel mounted 10 turn potentiometer External control can be exercised by resistance or by a control voltage See Section 11 When controlling the external current channel the power supply s panel mounted current control serves as an adjustable maximum current limit 3 CURRENT CHANNEL EXTERNAL Output current may be controlled by means of a separate current channel applying a 0 to 1V d c control signal at the REAR PROGRAMMING CONNECTOR for control over the rated current range This same channel properly programmed may control the output of the power supply responding to control and feedback volt
27. CURRENT MOCE ac QUTPUT RANGE SENES SERIES INDUCTANCE SHUNT SHUNT CAPACITANCE VOLTS AMPS RESISTANCE DESISTANCE 5 Fast ATE 6 100M sa awa omar 52 ATE 15 50M 0 15 0 50 6 u 0 5 6 uF as TESS TLIO SORE PRE reseau nce 0 90 26 01 Tekn 9200 5 200 aF 2 25 F ATE 100 10 0 1050 10_ 02 1200 0 25 uF FARE S ont nee pe Based on 0 5 mA load effect in FAST mode 1 2 TABLE 1 1 DC OUTPUT RATINGS ATE POWER SUPPLIES ATE A E 07 0780A c OUTPUT EFFECTS OFFSETS AND RIPPLE SPECIFICATIONS See Table 1 2 OUTPUT EFFECTS CURRENT MODE orrsers Maximum OUTPUT EFFECTS VOLTAGE MODE Maximum INFLUENCE QUANTITY Typical SOURCE VOLTAGE min max lt 0 002 le max iw etm LOAD load full load _____ lt 0 001 max 0 002 Eo max O5mA __ tv cna lt 0 005 max 0 019 1 max 0 02 1 max RIPPLE AND NOISE rms 0 1 mV 0 3 mV 0 0195 1 max 0 03 1 max Slow Mode p p 3 lt 1 3 mV lt 0 1 ly max 0 3 l max RIPPLE AND NOISE rms lt 1 3 lt 0 01 1 max 0 03 1 max Fast Mode p p 3 lt 10 mV 30 mV 5 lt 0 1 lo max 0 3 lo max 1 For models with output current rating of 50A and higher the load effect is 2 mA typical and 5 mA maximum
28. F TABLES iii iv lt a s s s 5 FIG 1 1 ATE POWER SUPPLIES From Top Size A B Size C Size D Size E ATE A E 2078 1 1 1 2 1 3 1 4 1 5 1 7 1 8 SECTION INTRODUCTION SCOPE OF MANUAL This manual contains instructions for the installation and operation of the 1 2 rack ATE series of voltage and current stabilized d c power supplies both M suffix analog meter and DM suffix digital meter manu factured by Kepco Inc Flushing New York U S A GENERAL DESCRIPTION The Kepco ATE with programmable overvoltage protector is a precision stabilized power supply which can deliver either stabilized output voltage or current The prevailing operating mode is indicated by LED mode indicators at the front panel Operating mode crossover is automatic and may be monitored remotely by means of a flag signal available at the rear programming connector The power supply features full range output control by means of 10 turn high resolution front panel potentiometers A pair of front panel meters con stantly monitor the output voltage and output current This power supply has a linear and fully dissipative NPN pass transistor section driven by high gain integrated circuit amplifiers The output of the power supply is fully programmable All necessary input terminals are provided on a programming connector at the rear of the chassis Termi
29. ISON AMPL land thereby the power supply output voltage over its rated range the previously derived signal from PREAMP A must be reversed and amplified with a gain of 10 PREAMP B is used in the inverting configuration for which the output equation is Ep Eg Rr ext R ext Selecting 1K ohm resistor for ext Ry must be 10K ohm to achieve the desired result Note The selected resistors should be high quality components with a tolerance of 196 They should be wired as close to the PROGRAMMING CONNECTOR terminals as possible 3 120 PROCEDURE PROGRAMMING WITH REFERENCE TO THE NEGATIVE POWER SUPPLY OUTPUT 1 Connect the external components the LOAD and the PRECISION VOLTMETER M1 to the ATE as shown in FIG 3 30 2 With the EXT CONTROL SOURCE at zero turn ATE on 3 Vary the EXT CONTROL SOURCE from zero to 10 volts The ATE output voltage as read out on 1 should vary approximately from zero voltage to the rated value Return the EXT CONTROL SOURCE to zero OD J oc ourer OO REMOVE JUMPERS M 5 6 7 8 19 27 AND 20 22 NE OUT SOM N gt REMOVE LINKS 1 2 RACK ATE POWER SUPPLY FIG 3 30 CONNECTIONS FOR PROGRAMMING WITH REFERENCE TO THE NEGATIVE POWER SUPPLY OUTPUT ATE 1 2 2578 3 33 3 121 APPLICATION OF THE ISOLATED FLAG SIGNALS 3 122 Two opto isolated flag signals are provided at the
30. L SOURCE to zero again re check the previously calibrated zero point on 1 and correct with the PREAMP A ZERO control if required Set the ATE front panel CURRENT CONTROL according to the LOAD requirements following the procedure given in 3 28 2 3 4 5 or use one of the output current programming circuits for remote control of the output current as described in PAR s 3 60 3 64 Set the overvoltage protector as described in PAR 3 31 Operation can now proceed Check the ATE power supply output by means of an oscilloscope for dynamic stability and output ripple amplitude Refer to PAR 3 6 if high ripple is present If the power supply output is dynamically unstable oscillations review the paragraphs on power supply load inter face and grounding PAR s 3 6 through 3 26 Adjust the E LAG control if the ATE is configured for fast mode 3 11 3 57 3 58 3 59 3 60 3 61 3 62 3 12 PROGRAMMING THE CURRENT CONTROL CHANNEL GENERAL The ATE output current controlled by a front panel CURRENT CONTROL rheostat in the local control mode can be remotely controlled by disconnecting the 15V bias from the non inverting input of the EXT CURRENT COMPARISON AMPL at the REAR PROGRAMMING CONNECTOR and applying a to 1 volt external control signal with reference to the ATE COMMON terminal Since the non inverting input of the EXT CURRENT COMPARISON AMPL is used only the small amplifier bias current must be supplied by the
31. LTAGE Model SN 488 Digital Programmer the LOAD and the PRECISION VOLTMETER 1 to the ATE as shown in FIG 3 11 Note The output current value can be measured directly by means of a suitable ammeter in series with the load or as indicated in FIG 3 11 indirectly by means of the precision voltmeter M1 across a current measuring resistor should be selected such that a convenient range on the precision voltmeter can be used e g for a 10 ampere output current use a 0 1 ohm resistor to produce a one volt full scale reading an electronic voltmeter is used it should be batter operated to avoid ground loops 2 With the SN 488 output at zero turn the ATE 3 Vary the input voltage from the SN 488 from zero to 1 volt The ATE output current as read out on M1 should vary from approximately zero volts to its maximum rated value Return the SN 488 output to zero volts REMOVE JUMPER 15 23 ON PC 12 KEPCO SNR 488 DIGITAL PROGRAMMER HII III II TO AC INPUT SOURCE 150 491 1 2 RACK ATE POWER SUPPLY FIG 3 11 CONNECTIONS FOR OUTPUT CURRENT CONTROL WITH 0 1 VOLT CONTROL SIGNAL KEPCO SN 488 DIGITAL PROGRAMMER ATE 1 2 2578 3 63 CALIBRATION Refer to Section FIG 2 1 for the location of all internal controls 1 Check the PRECISION VOLTMETER M1 zero reading and correct if necessary with the ATE 1g ZERO control 2 Set the Model SN
32. NT ee 24 26 27 28 30 FROM CURRENT OUTPUT INT REF 5 7K E source CHANNEL m poc s IK mm Gemma 17 Le oe _ J Ib Er PART OF 12 ve 0 l00mv FIG 3 17 ILLUMINATION CONTROL CIRCUIT WITH THE ATE POWER SUPPLY 3 87 Refer to FIG 3 17 Assuming the ATE power supply is compatible with the requirements of the lamp load the control circuit may be designed as shown with one of the ATE preamplifiers or an external control voltage source can be connected as indicated with the dashed lines in FIG 3 17 The external source should be adjust able in the range from O to 100mV if illumination control is desired or it should have a means of calibration if a fixed external source is used for a constant illumination level 3 88 in the example the ATE internal preamplifier PREAMPL is used to develop the control signal E 0 100mV which is compared with the photo cell output at the input to the EXT CURRENT COMPARISON AMPLIFIER The external reference resistor R and the control rheostat are selected to produce the control signal similar to the example described in a previous application See par 3 64 ATE 1 2 2578 3 19 3 89 3 90 3 91 3 92 3 20 DC OUTPUT 9 OuT BRIGHTNESS CONTROL Rec 100 2 14 31 6 5 gt Co 1 our lS Ib CAL GM ON 12 Qs EMOVE JUMPERS C SOURCE ite 10 14 AINE U
33. O SCALE THE AVAILABLE CONTROL VOLTAGE UP OR DOWN AS REQUIRED VOLTS MI TO IEEE488 BUS arm LN VOLTS M2 eyes AND S1 22 ON 12 2 KEPCO MODEL SNR 488 4 T820 OO INTERFACE scourur JD O cc FS Corg RM N lle st LOAD S esa REMOVE LINKS tas 2 3 AND 5 e ON TB20 AC SOURCE JNJ INPUT IN SIGNAL 2 RACK ATE POWER SUPPLY FIG 3 16 CONNECTIONS FOR CONTROL OF OUTPUT VOLTAGE AND OUTPUT CURRENT BY MEANS OF EXTERNAL VARIABLE CONTROL VOLTAGES SUPPLIED BY THE KEPCO SN 488 DIGITAL PROGRAMMING SYSTEM ATE 1 2 2578 3 17 3 80 3 81 3 82 3 83 3 18 PROCEDURE OUTPUT CONTROL WITH EXTERNAL CONTROL VOLTAGES SUPPLIED BY THE SN 488 STEP 1 Connect external components the LOAD the PRECISION VOLTMETERS and the as shown in FIG 3 16 STEP 2 With the VOLTAGE CONTROL SIGNAL Channel A at some non zero value and the CURRENT CONTROL SIGNAL Channel B at zero turn power supply on STEP 3 Close S1 Vary the CURRENT CONTROL SIGNAL from zero to its maximum value The power supply output current as read out on M2 should vary from approximately zero to the rated maximum output current Leave CURRENT CONTROL SIGNAL at its maximum setting STEP 4 Open S1 Vary the VOLTAGE CONTROL SIGNAL from its initial setting to its maximum value The output voltage as read out on M1 should var
34. OAD CONNECTIONS TABLE 2 3 REAR TERMINATIONS ATE 1 2 RACK GROUP ATE 1 2 2578 2 3 2 4 2 5 2 6 2 7 2 8 29 A C INPUT REQUIREMENTS This power supply is normally supplied for operation on a single phase nominal 115 a c line For conversion to other a c source voltages refer to FIG 2 4 Select your nominal source voltage and change the links on the barrier strip of T201 according to the table provided in FIG 2 4 The circuit breaker CB101 remains equally effective at all input voltages CONNECT LINKS AC SOURCE 104 V 3 4 7 8 115 4 5 6 7 208 V 2 3 8 9 230V 5 6 FRONT ATE 1 2 RACK SIDE VIEW COVER REMOVED FIG 2 4 INPUT SOURCE VOLTAGE SELECTION ATE 1 2 RACK GROUP COOLING The power transistors and rectifiers in the ATE power supplies are maintained within their operating tempera ture range by means of special heat sink assemblies cooled by internal fans SIDE PANEL OPENINGS AND THE TOP OF THE CASE MUST BE KEPT CLEAR FROM OBSTRUCTIONS TO INSURE PROPER AIR CIRCULATION Periodic cleaning of the interior of the power supply is recommended If the power supply is rack mounted or installed into confined spaces care must be taken that the ambient temperature the tem perature immediately surrounding the power supply does not rise above the limit specified refer to Section 1 PRELIMINARY CHECK OUT A simple operating check after u
35. OPERATOR S MANUAL ATE 1 2 RACK POWER SUPPLY AUTOMATIC TEST EQUIPMENT MODEL 250W ATE 6 25 ATE 15 15 ATE 25 10 ATE 36 8 ATE 55 5 ATE 75 3 ATE 100 2 5 ATE 150 1 5 ATE 325 0 8 KEPCO INC An ISO 9001 Company IMPORTANT NOTES 1 This manual is valid for the following Model and associated serial numbers MODEL SERIAL NO REV NO 2 A Change Page may be included at the end of the manual All applicable changes and revision number changes are documented with reference to the equipment serial num bers Before using this Instruction Manual check your equipment serial number to identify your model If in doubt contact your nearest Kepco Representative or the Kepco Docu mentation Office in New York 718 461 7000 requesting the correct revision for your par ticular model and serial number 3 The contents of this manual are protected by copyright Reproduction of any part can be made only with the specific written permission of Kepco Inc Data subject to change without notice P N 228 1724 REV 1 THE POWER SUPPLIER KEPCO INC 131 38 SANFORD AVENUE FLUSHING NY 11355 U S A TEL 718 461 7000 FAX 718 767 1102 email hq Qkepcopower com World Wide Web http www kepcopower com INSTRUCTION MANUAL CORRECTION 69 KEPCO THE POWER SUPPLIER Please note the following corrections to the standard Instruction Manual for ATE models plu
36. OURCE N INPUT TO AC INPUT SOURCE 150 491 1 2 RACK ATE POWER SUPPLY SUPPLY 2 FIG 3 25 CONNECTIONS FOR AUTOMATIC PARALLEL OPERATION 3 27 3 108 3 109 3 110 3 28 MASTER SLAVE PARALLEL CONNECTION This method is especially convenient with ATE power supplies since no external current sensing resistors are required and all control connections can be made via the ATE s rear PROGRAMMING CONNECTOR In the MASTER SLAVE parallel mode the EXT CURRENT COMPARISON AMPL on each SLAVE unit is discon nected from its 15V bias and is driven instead from the common MASTER CURRENT SENSING AMPL As the MASTER supply delivers load curr rit from zero to its rated maximum value the signal from CURRENT SENSING AMPL changes from zero to 1 volt Applied to each SLAVE unit this signal programs the output current of the SLAVE units from zero to the maximum value While all Slave units will operate in the current mode the MASTER unit can be operated in either the voltage or the current mode PROCEDURE MASTER SLAVE PARALLEL CONNECTION 1 All power supplies to be paralleled must be able to deliver the required compliance load voltage Before paralleling set each power supply voltage control to this voltage 2 Make all load and sensing connections as shown in 216 3 26 3 Turn all power supplies on Observe from panel meters and MODE indicator s Adjust the MASTER supply output controls for either voltage or c
37. RCUIT INDUCTANCE OUTPUT IMPEDANCE Zo CURRENT MODE MPEDANCE DECREASING Ze WITH FREQUENCY DUE TO OUTPUT CAPACITANCE FREQUENCY FIG 3 1 TYPICAL OUTPUT IMPEDANCE VS FREQUENCY PLOT FOR STABILIZED D C SOURCES NOTE Load connections for application requiring solely stabilized output current are not as critical as those requiring 3 2 stabilized output voltage a D C wire drops do not influence the current stabilizing action but must be subtracted from the available compliance voltage b Wire inductance is swamped out by the action of the output capacity Emphasis in the following paragraphs is therefore placed on the power supply as a voltage source rather than a current source ATE 1 2 2578 A more realistic model for a voltage stabilized power supply must for example include a series resistance representing the small d c and low frequency source impedance in series with an inductance representing the source impedance at higher frequencies Load wire selection should therefore proceed with those facts in mind The load wire size should not only be selected for minimum voltage drop Error Sensing as discusses below will take care of that but also the series inductance of the load wire must be kept as small as possible compared to the source inductance of the power supply Error Sensing cannot compensate for this These dynamic considerations are especially important if 1 The load is constantly ch
38. T AND 15 23 ADD JUMPER 5 15 INPUT SOURCE 1 2 RACK ATE POWER SUPPLY FIG 3 18 CONNECTIONS FOR ILLUMINATION CONTROL USING THE EXT CURRENT COMPARISON AMPL PROCEDURE ILLUMINATION CONTROL 1 Connect the external components to the ATE power supply as shown in FIG 3 18 2 Adjust both ATE front panel VOLTAGE and CURRENT CONTROLS approximately 1096 beyond the values required by the LAMP which represents the power supply load Although the voltage or current channel are not in control in this application the setting of the front panel output controls close to the lamp requirements serve as a back up voltage and current limit should feedback control from the photo cell be lost 3 Turn the external BRIGHTNESS CONTROL to its mid range and turn the ATE power supply Vary the BRIGHTNESS CONTROL through its range and observe its effect on the LAMP The lamp brightness should vary from zero dark to the approximate maximum brightness CALIBRATION Turn the BRIGHTNESS CONTROL to its maximum clockwise position and adjust the external lp CAL control until the maximum desired brightness is measured MULTIPLE POWER SUPPLY AND SYSTEMS OPERATION In applications where several power supplies are used it is often necessary to shut down all power supplies if a malfunction on a single supply forces its shut down Sometimes a PANIC BUTTON arrangement is desired where all system pow
39. TION OF ATE POWER SUPPLIES 3 104 Normally crowbar equipped power supplies can not be connected in parallel since a triggered crowbar in one supply working in a parallel configuration would present a short circuit to all other supplies and would have to absorb the total output current the ATE power supply crowbar control circuitry is provided allowing the setup of a fault detection loop which shuts off all power supplies in a parallel configuration if one power supply is crowbared for any reason 3 105 As in the previously described series connections an Automatic or Master Slave connection method can be chosen for paralleling ATE power supplies The choice between the two methods will depend on the application at hand For constant loads or small load variations load changes smaller than the maximum output range of a single power supply the Automatic parallel connection can be used For load changes exceeding the maximum rating of a single power supply the Master Slave method is suitable Both methods allow operation in the voltage or current mode For either method some general rules should be observed 1 Parallel only supplies which can be adjusted to the same compliance output voltage 2 Error sensing as shown in the following diagrams can be used to compensate for load wire voltage drops 3 Load wires should be as short as practiceble Select wire gauge as heavy as possible and twist wires ti
40. Turn the ATE front panel VOLTAGE CONTROL one turn counterclockwise and re activate the ATE circuit breaker 6 Test the previously set crowbar level again by turning the front panel VOLTAGE CONTROL slowly counterclockwise and observing the voltmeter If the ATE does not shut down at the intended crowbar level correct the setting of the EXT CONTROL SOURCE turn front panel VOLTAGE CONTROL one turn counterclockwise re activate the ATE circuit breaker and test again 7 Turn the ATE front panel VOLTAGE CONTROL to the exact operating voltage which the LOAD requires OO DC OUTPUT oo e E SOT NS os EXT CROWBAR CONTROL a oUT E mli votrs t wal 9 REMOVE LINKS gt 2 3 AND 5 6 tos T820 HE ac SOURCE REMOVE JUMPER 11 13 0N PC 12 lt INPUT SEES w ELS Ty NK TO AC INPUT 150490 6 AG 1 2 RACK ATE POWER SUPPLY FIG 3 14 REMOTE CROWBAR LEVEL CONTROL WITH AN EXTERNAL 0 10V D C 1 mA SIGNAL SOURCE ATE 1 2 2578 3 15 3 75 AUTOMATIC TRACKING CONTROL OF THE CROWBAR LEVEL 3 76 In this application an ATE s voltage output is remotely controlled by a 0 10 volt external programming signal which is simultaneously applied as a control signal to the overvoltage protector As the ATE output voltage is now programmed by the external programming source throughout the specified range of the ATE the crowb
41. VOLTAGE COMPARISON AMPL with reference to the PROGRAMMING COMMON For this direct drive method of voltage control the control signal must be a positive going 0 10 volt d c voltage source able to supply at least 1 mA of control current An application demonstrating this control method is described in PAR 3 41 and illustrated in FIG 3 6 Since all terminals of two independent preamplifiers PREAMP A PREAMP B are available at the REAR PROGRAMMING CONNECTOR output voltage control can be exercised in many other ways Each preampli fier can be used as an uncommitted operational amplifier using the applicable transfer functions The static offsets of each preamplifier can be zeroed with the built in ZERO controls The offset variations for each preamplifier versus the various influence quantities are specified in Section of this manual Refer to Table 1 2 Making use of the ATE preamplifiers allows the user to accommodate a variety of programming sources The basic principle to keep in mind is that a O to 10 volts 1 mA signal presented at the VOLTAGE COMPARISON AMPL input will program the ATE output over its rated output voltage range If the available programming input source does not have the required amplitude or if the required control current cannot be supplied the ATE preamplifiers can be used to adapt most input sources and provide the required parameters The examples presented in the following paragraph should suffice to outlin
42. When the ATE power supply is used in FAST MODE with a programming reference to the negative out put of the unit see PAR 3 115 and Figure 3 29 some oscillation may be present at the output This can be avoided by installing a ceramic capacitor between PC12 pins 1 and 2 The capacitor value is model ATE INST MAN 111006 KEPCO INC 131 38 SANFORD AVENUE FLUSHING NY 11355 U S A TEL 718 461 7000 FAX 718 767 1102 email hq Qkepcopower com World Wide Web http www kepcopower com dependent within the range 1 2nF to 4 7nF and it must be rated for more than the nominal output volt age of the unit NOTES 1 When the ceramic capacitor is installed at PC 12 pins 1 and 2 the 3 dB frequency bandwidth of the unit in FAST MODE is reduced by a factor of from 1 5 to 2 5 Correspondingly the response time will be increased by the same factor 2 To reduce the rise time delay see C above REDUCING RISE TIME DELAY 3 To reduce the fall time delay adjust the current limit to a higher value than maximum application cur rent to ensure that for the high level of the programming signal the unit is not forced to enter current limit mode 4 To prevent the unit from going into over voltage protection and shutting down when the low impedance programming source is disconnected install a 10 Kohm resistor 1 0 125W at the input programming terminals of PC 12 5 To reduce a c line related noise at the output connect o
43. a small high frequency type capacitor may be required across the contacts of the interrupting device or the power supply output terminals or directly across the load terminals A ceramic disc capacitor 0 011 has been found to be adequate to prevent spurious triggering of the overvoltage circuit ATE 1 2 981 3 1 3 2 3 3 3 4 3 6 3 7 3 8 3 9 3 10 SECTION OPERATION GENERAL Interconnections between a c power source and a stabilized power supply and between the power supply and its load are as critical as the interface between other types of electronic equipment If optimum perfor mance is expected certain rules for the interconnection of source power supply and load must be observed by the user These rules are described in detail in the following paragraphs SAFETY GROUNDING National and international safety rules dictate the of the metal cover and case of any instrument connected to the a c power source KEEP INSTRUMENT GROUNDED WHILE IT IS CONNECTED TO THE A C POWER SOURCE Kepco power supplies with flexible a c power cord are equipped with a 3 prong safety plug which must be connected to a grounded a c power outlet D C OUTPUT GROUNDING Connections between the power supply and the load load and sensing connections as well as connections to the power supply amplifiers programming connections may despite all precautions such as shielding twisting of wire
44. ages from temperature or pressure sensors chemical reactions and the like See Section lll 4 OVERVOLTAGE PROTECTOR The crowbar level may be controlled locally by the provided CROWBAR LEVEL control at the front panel Remote control of the crowbar level can be exercised by connecting a 0 10 volt control source to the REAR PROGRAMMING CONNECTOR Automatic track ing of the crowbar level with the output voltage level may be achieved by means of the simultaneous connection of the voltage channel programming source to the tracking input MODE FLAG A pair of panel LED indicators operate to indicate whether the voltage channel or the internally sensed current channels have control of the output in addition an isolated flag signal is pro vided through an opto isolator at the rear programming connector REMOTE ERROR SENSING Separate voltage sensing terminals permit 4 wire connections to a load Will compensate for static load effects up to 0 5V per lead An additional 1 Volt output voltage beyond the nominal voltage rating of each ATE model is provided for this purpose REFERENCE SUPPLIES Two dual reference sources are available at the REAR PROGRAMMING CON NECTOR 6 2V d c 1 and 15V d c 10 mA CURRENT SENSING AMPLIFIER The output of the current sensing amplifier is available on the rear pro gramming connector It provides a voltage analog of the output current The range of the analog output is 0 to 1V corresponding to output
45. anging in value 2 Theload is switched on and off 3 Theoutput of the power supply is step programmed 4 The load has a primarily reactive characteristic 5 All other cases where the dynamic output response of the power supply is considered important 3 16 LOAD CONNECTION GENERAL 3 17 Kepco has provided a group of terminals on the programming connector PC 12 and on the barrier strip TB210 at the rear of the power supply which permit maximum flexibility in power supply ioad interface techniques Although all applications tend to exhibit their own problems the basic interconnections described may be used as a general guide in the interconnection between power supply and load 3 18 Refer to FIG 3 2 The Kepco power supply is shipped from the factory with several jumper links connected to the programming connector PC 12 and to the barrier strip TB201 These links may be removed and replaced at will depending on the operating mode and application of the power supply Positioned as shown in FIG 32 the links are connected for front panel local control of the output voltage output current and VP crowbar level with the power supply operating in the slow mode Links remaining on the mating jack must be soldered links on the barrier strip must be tightened LOOSE WIRES OR LINKS AT THE BARRIER STRIP OR THE MATING JACK WILL CAUSE MALFUNCTION OF THE POWER SUPPLY DC OUTPUT OUT gt 3
46. ar level is tracking the output voltage i e it always remains higher than the instantaneous ATE output voltage thus providing automatic overvoltage protection throughout the range 3 77 PROCEDURE AUTOMATIC TRACKING CONTROL OF THE CROWBAR LEVEL ATE IN SLOW MODE 1 3 16 1 Connect jumpers on the REAR PROGRAMMING CONNECTOR as indicated in FIG 3 15 and connect Switch S1 as shown Turn front panel CROWBAR LEVEL control fully counterclockwise 2 Connect a substitute LOAD and the EXT PROGRAMMING SOURCE as shown in FIG 3 15 3 To test the overvoltage protector action turn ATE and set output voltage by means of the EXT PROGRAMMING SOURCE to a nominal value Switch S1 from position A to B The overvoltage protec tor will crowbar the ATE output The CROWBAR indicator will be momentarily and the ATE circuit breaker will trip 4 Remove S1 and connect a jumper between 13 21 of PC 12 Connect the actual LOAD reactivate the ATE circuit breaker and commence operaiun Should erratic triggering occur in actual operation set front panel CROWBAR LEVEL control slightly clockwise This will increase the threshold voltage that is the difference voltage between the crowbar level and the operating voltage OO pis DC OUTPUT Hout LOAD REMOVE JUMP ten 22 AND 159 26 1Co 9 i ON PC i2 esl 2 EMOVE LINKS n 2 5 6 z
47. ated for field wiring and therefore must be properly configured by the end product manufacturer prior to use This power supply employs a supplementary circuit protector in the form of a circuit breaker mounted on the front panel This circuit breaker protects the power supply itself from damage in the event of a fault condition For complete circuit protection of the end product as well as the building wiring it is required that a primary circuit protection device be fitted to the branch circuit wiring EN61010 1 2001 CI 9 5 Hazardous voltages are present within this power supply during normal operation All operator adjust ments to the product are made via externally accessible switches controls and signal lines as speci fied within the product operating instructions There are no user or operator serviceable parts within the product enclosure Refer all servicing to qualified and trained Kepco service technicians 228 1351 COND CONFORM 081910 SAFETY INSTRUCTIONS 1 Installation Operation and Service Precautions This product is designed for use in accordance with EN 61010 1 and UL 3101 for Installation Category 2 Pollution Degree 2 Hazardous voltages are present within this product during normal operation The product should never be operated with the cover removed unless equivalent protection of the operator from accidental contact with hazardous internal voltages is provided There are no operator serviceable parts or adjustm
48. bed although more can be connected 1 Without connecting the power supplies to the load or to each other turn a c power on and adjust the output voltage on each supply to the desired value 2 Adjust both power supply current controls to their maximum extreme clockwise position Turn a c power off 3 Make all load interconnections as shown in the connection diagram refer to FIG 3 25 4 Place the individual a c power switches of the power supplies in the on position Observe output current meters and mode lights on both units Since the initial output voltage adjustments were not identical one of the power supplies to be designated SUPPLY 1 will be at a slightly higher output voltage than the other to be designated SUPPLY 2 Consequently SUPPLY 1 will deliver its maximum load current and will operate in the current mode CURRENT MODE indicator on The rest of the load current is delivered by SUPPLY 2 which is operating in the voltage mode VOLTAGE MODE indicator 5 The Current Control of SUPPLY 1 can now be adjusted as to equalize the total load current between SUPPLY 1 and SUPPLY 2 and operation can proceed ATE 1 2 2578 ATE 1 2 2578 TO AC INPUT SOURCE 150 491 1 2 RACK ATE POWER SUPPLY SUPPLY 1 REMOVE JUMPER 29 32 ON 12 OF ALL UNITS DC OUTPUT C i 5 9 T 5 D imw te i S
49. control current R1 can be replaced by a short circuit and the preamplifier operates as a voltage follower 3 10 ATE 1 2 2578 3 55 PROCEDURE VOLTAGE CONTROL WITH A HIGH IMPEDANCE CONTROL SOURCE 1 2 3 Connect the external components the LOAD and the PRECISION VOLTMETER M1 to the ATE as shown in FIG 3 10 With the EXT CONTROL SOURCE at zero turn the ATE on Vary the EXT CONTROL SOURCE from zero to its maximum output level The ATE output voltage as read out on M1 should vary from approximately zero volts to its rated maximum value Return the EXT CONTROL SOURCE to its zero position T8201 0C OUTPUT ty OUT LOAD C ah ww EXT CONTROL SOURCE REMOVE JUMPERS 7 8 21 22 AND 19 27 0N 12 AOD JUMPERS 7 2n ON PC 12 REMOVE LINK 5 AND 5 So TO AC INPUT SOURCE 1 2 RACK ATE POWER SUPPLY FIG 3 10 CONNECTIONS FOR VOLTAGE CONTROL WITH A HIGH IMPEDANCE INPUT SOURCE 3 56 CALIBRATION Refer to Section 11 FIG 2 1 for the location of a internal controls 1 2 3 4 5 ATE 1 2 2578 Check the PRECISION VOLTMETER M1 for zero reading and correct if necessary with the PREAMP A ZERO control Set EXT CONTROL SOURCE to maximum output Observe M1 and calibrate the ATE output vol tage to the exact maximum rated value by adjusting the Calibrating Control in the EXT CONTROL SOURCE Set EXT CONTRO
50. currents of 0 to 100 respectively 1 11 MECHANICAL SPECIFICATIONS 8 Refer to the Mechanical Outline Drawing FIG 1 2 1 12 ACCESSORIES 1 13 ATE power supplies are supplied with one Model PC 12 Programming Connector mounted and wired for front panel output control Additional connectors are optional and may be ordered as MODEL PC 12 unwired ATE models smaller than full rack size can be rack mounted using one of several Kepco Rack Adapters NOTE ALL KEPCO RACK ADAPTERS FIT STANDARD EIA RACK DIMENSIONS THEY ARE DRILLED FOR STANDARD CHASSIS SLIDES AND ARE PROVIDED WITH SLIDE SUPPORT BRACKETS a RACK ADAPTER KEPCO MODEL RA 24 For all Kepco quarter rack half rack and three quarter rack models or a mixture of them Filler panels to cover empty slots if the adapter is not used to its full capacity are available b RACK ADAPTER KEPCO MODEL RA 32 For two Kepco quarter rack models or one half rack model Has additional space for three one sixth rack modular Kepco units Filler paneis to cover empty slots if the adapter is not used to its full capacity are available RACK ADAPTER KEPCO MODEL 37 Kepco ATE models only Accepts quarter rack half rack or three quarter rack ATE models or a mixture of them The model RA 37 can be used without filler support brackets when fully loaded 1 14 OPTIONS 1 15 MODEL SUFFIX DM This option replaces the analog voltmeter and ammeter on the front panel with dig
51. d the PRECISION VOLTMETER M1 to the ATE as shown in FIG 3 13 NOTE The output current value can be measured directly by means of suitable ammeter in series with the load or as indicated in FIG 3 13 indirectly by means of the precision voltmeter M1 across a current measuring resistor should be selected such that a convenient range on the precision voltmeter can be used e g for a 10 ampere output current use a 0 1 ohm resistor to produce one volt full scale If an electronic voltmeter is used it should be battery operated to avoid ground loops 2 With the EXT CURRENT CONTROL at zero ohms turn the ATE on 3 Vary the EXT CURRENT CONTROL from zero ohms to its maximum resistance The ATE output current as read out on M1 should vary from approximately zero to its maximum value Return the EXT CURRENT CONTROL to its zero ohm position EXT CURRENT CONTROL PRECISION VOLTMETER Rr ext 5 7K On CAL ext REMOVE JUMPERS 5 6 AND I5 23 ON 12 ADD JUMPER 5 15 ON 12 TO AC INPUT SOURCE FIG 3 13 CONNECTIONS FOR ATE OUTPUT CURRENT CONTROL WITH A TWO TERMINAL RESISTANCE 3 69 CALIBRATION Refer to Section FIG 2 1 for the location of all internal controls 1 Check the PRECISION VOLTMETER M1 for zero reading and correct if necessary with the PREAMP ZERO CONTROL 2 Set EXT CURRENT CONTROL to its maximum resistance Observ
52. dicator should now be energized Slowly turn CURRENT CONTROL clockwise and observe the gradual increase in output current The AMMETER should now read full scale ATE 1 2 2578 2 10 2 11 2 14 2 15 2 16 2 17 INSTALLATION Refer to FIG 1 3 Mechanical Outline Drawing The Power Supply may be rack mounted or operated as a bench type instrument If the ATE is to be rack mounted the 4 bottom feet must be removed i For all installations into confined spaces care must be taken that the temperature immediately surrounding the unit does not exceed the maximum specified ambient temperature 65 C GROUNDING a A C SAFETY GROUND The power supply is equipped with a 3 wire safety line cord and polarized plug The third green wire in the line cord is connected to the chassis and the case of the unit If a 2 terminal receptacle in combination with an adapter is used it is imperative that the chassis of the power supply be returned to a c ground with a separate lead A grounding terminal is provided at the rear barrier strip for this purpose b ISOLATION FROM GROUND The d c output is isolated from the a c source and from any direct con nection to chassis or ground The maximum output voltage that can be supported between either output terminals and ground or chassis is 500V d c plus the maximum output voltage of the power supply Either side of the output may be grounded A resistor capacitor network is connected fro
53. dynamically unstable oscillations review the paragraphs on power supply load inter face and grounuing PAR s 3 6 through 3 26 Adjust the Eg LAG control if the ATE is configured for fast mode operation 3 51 VOLTAGE CONTROL WITH A HIGH IMPEDANCE CONTROL SOURCE 3 52 External control sources which cannot supply at least 100uA of control current can be best accommodated by using one of the preamplifiers in the non inverting configuration The control source is connected to the ATE as shown in FIG 3 9 TO ATE DRIVER CKT VOLTAGE COMPARISON AMPLIFIER 0 10V tonivE VOLTAGE EXT CONTROL SOURCE FIG 3 9 USING PREAMP A TO GENERATE THE 0 10V 1 mA CONTROL POTENTIAL FROM A HIGH IMPEDANCE SOURCE 3 53 Refer to FIG 3 9 The preamplifier output voltage Ep is made equal to the required drive voltage E by calculating the external resistors R1 R2 for the required gain using the equation Ej Ep e X Ri R2 Eq 3 where Preamplifier Output Voltage R2 equal to the required drive voltage Ei ei 7 Available control source R1 R2 External feedback resistors 3 54 If for example 0 to 0 5 volt contro source is available the preamplifier gain and therefore the ratio R1 R2 over R2 must equal 10 0 5 20 so that R1 R2 can be 38KQ and 2KQ respectively If only an impedance match is needed i e if a 0 10 volt source is available but cannot deliver 1 mA of
54. e The current mode VIX indicator should go on to indicate that the power supply is truly in the current mode of operation Turn A C POWER SWITCH CIRCUIT BREAKER OFF 3 Remove the short circuit connect the load and turn A C POWER SWITCH CIRCUIT BREAKER on If the ATE does not enter the current mode as indicated by the front panel VIX indicator the load resistance R is too high Either Ry must be decreased or the VOLTAGE CONTROL setting must be increased or the CURRENT CONTROL setting must be decreased The ATE is now ready for operation OVERVOLTAGE CROWBAR SETUP AND CHECK The overvoltage crowbar circuit protects the load from momentary or long term overvoltages The crowbar SCR conducts across the power supply output and the A C POWER SWITCH CIRCUIT BREAKER is tripped if such overvoltages occur The setting of the front panel LEVEL contro determines the threshold between the actual operating voltage of the power supply and the level at which the crowbar circuit will be activated The LEVEL control can be set from 3 volts to 11096 of the rated output voltage The LEVEL control may be adjusted very close the the operating voltage minimum threshold 296 of rated output voltage or 0 5 volt whichever is greater The operation of the crowbar circuit can be checked without actually triggering the crowbar All operating controls are accessible at the front panel refer to FIG 2 2 SECTION 1 SETUP AND CHECK PROCEDURE 1 Wit
55. e M1 and calibrate the ATE output current to the exact maximum rated value by adjusting the EXT lp CAL control 3 Set EXT CURRENT CONTROL to zero ohms again re check the previously calibrated zero point on Mi and correct with the PREAMP B ZERO control if required 4 Set the ATE front panel VOLTAGE CONTROL according to the LOAD requirements or use one of the output Voltage programming circuits for remote control as described in PAR s 3 37 through 3 56 5 Operation can now proceed Check the output by means of an oscilloscope across Ry for dynamic stability and output ripple amplitude Refer to PAR 3 6 if high ripple is present If the power supply output is dynamically unstable oscillations review the paragraphs on power supply load interface and grounding PAR s 3 5 through 3 26 3 14 ATE 1 2 2578 3 70 3 71 3 72 3 73 3 74 PROGRAMMING THE OVERVOLTAGE PROTECTOR The ATE overvoltage protector crowbar level is normally set by a front panel screwdriver adjusted contro SET LEVEL This local operating mode has been previously described in PAR 3 31 The crowbar level can be independently remotely controlled by setting the internal crowbar level to zero turning the front panel SET LEVEL contro completely counterclockwise and applying an external contro signal 0 to d c at the OVERVOLTAGE INPUT In another programming mode the crowbar level can be controlled in a tracking mode i e the 0 10 volt
56. e the wide variety of programming circuits which are possible with the ATE power supply OUTPUT VOLTAGE CONTROL WITH AN EXTERNAL 0 10 VOLT D C CONTROL SIGNAL An interesting example of the direct drive method of voltage programming is the control of the ATE output voltage by means of a Kepco Digital Programmer The IEEE 488 bus compatible Kepco SN 488 system for example responds to digital input data and can be addressed either by a computer or manually The output signal of the SN 488 is a voltage from zero to 10 volts or zefo to 1 volt and constitutes the input program for the ATE Since the SN 488 has two independent outputs A B only one output is needed for voltage control while the other may be used to control the ATE output current See par 3 60 PROCEDURE VOLTAGE CONTROL WITH AN EXTERNAL 0 10 VOLT 1 mA D C CONTROL SIGNAL 1 Connect the EXT CONTROL VOLTAGE SN 488 DIGITAL PROGRAMMER the LOAD and the PRECISION VOLTMETER M1 to the ATE as shown in FIG 3 6 2 With the SN 488 at zero turn the ATE 3 Vary the input voltage from the SN 488 from zero to 10 volts The ATE output voltage as read out on M1 should vary from approximately zero volts to its maximum rated output voltage Return the SN 488 output to zero volts ATE 1 2 2578 3 7 3 44 CALIBRATION Refer to Section i FIG 2 i for the location of all internal controls 3 45 3 46 38 1 Check the PRECISION VOLTMETER M1 for zero
57. ents within the product enclosure Refer all servicing to trained service technician Source power must be removed from the product prior to performing any servicing This product is factory wired for the nominal a c mains voltage indicated on the rat ing nameplate located adjacent to the source power connection on the product s rear panel To reconfigure the product input for other nominal mains voltages as listed herein the product must be modified by a trained service technician PP P 2 Grounding This product is a Class 1 device which utilizes protective earthing to ensure operator safety The PROTECTIVE EARTHING CONDUCTOR TERMINAL must be properly con nected prior to application of source power to the product see instructions on instal lation herein in order to ensure safety from electric shock PROTECTIVE EARTHING CONDUCTOR TERMINAL This symbol indicates the point on the product to which the protective earthing conductor must be attached EARTH GROUND TERMINAL This symbol is used to indicate a point which is connected to the PROTECTIVE EARTHING TERMINAL The component installer assembler must ensure that this point is connected to the PROTECTIVE EARTH ING TERMINAL CHASSIS TERMINAL This symbol indicates frame chassis connection which is supplied as a point of convenience for performance purposes see instructions on grounding herein This is not to be confused with the protective earthing point and may not be u
58. er supplies can be shut down with a single manual switch or a common signal from a controller ATE power supplies are ideally suited for mult unit poeration since all necessary crowbar control circuit connections are terminated at the rear PROGRAMMING CONNECTOR 12 The crowbar control connections in a multi unit application can be externally wired to form a closed loop fault detection circuit as shown in FIG 3 19 Although only three ATE power supplies are shown the control loop may be extended to include as many ATE power supplies as are required ATE 1 2 2578 SEE FIG 3 3 TO CROWBAR STATUS PANIC US TO MODE BUTTON INDICATOR INDICATOR ATE POWER SUPPLY SUPPLY NO NO 3 FIG 3 19 MULTIPLE POWER SUPPLY FAULT DETECTION LOOP 3 93 In addition to the crowbar input output terminals optically isolated flag signals are available at the PROGRAM MING CONNECTOR 12 of each ATE power supply These signals may be used to indicate the crowbar status and the operating mode of each ATE power supply See FIG s 3 19 3 31 and PAR 3 121 3 94 SERIES CONNECTION OF ATE POWER SUPPLIES 3 95 Kepco ATE power supplies may be connected in series for increased voltage output Series connection of two ATE units is described here but several units up to an output voltage total of 500 volts may be inter connec ted Two basic methods of series connection are commonly used The AUTOMATIC the MASTER SLAVE co
59. eturned to the case over a resistor capacitor combination refer to Section Par 2 13 In those cases therefore where the oad is internally grounded or where the signal ground must be established elsewhere the resistor capacitor combination must be removed from the power supply case in order to avoid ground loop problems If there is a choice in selecting either the positive or the negative output of the power supply for the d c ground point both sides should be tried and preference given to the ground point producing the least noise Output ripple specifications as measured at the output are howver equally valid for either output side grounded Care should be taken in measuring the ripple and noise at the power supply output or at the load Measuring devices which are a c line operated often introduce ripple and noise into the circuit In the case where the load must be kept completely off ground d c isolated or it must be operated above ground potential grounding can be accomplished by means of a suitable capacitor connected from either side of the power supply output to the signal ground The size of the capacitor should be carefully selected A value between 0 1 and 1 microfarad has been found to be successful in many cases ATE 1 2 2578 3 1 3 11 3 12 3 13 3 14 3 15 Even simple remote control tasks such as error sensing or resistance programming require careful shielding with 2 wire shielding cable with the
60. ghtly Approximately equal lengths of wire should be used 4 Use the fault detection loop circuit as described in par 3 91 ATE 1 2 2578 3 25 NOTE The diagram below refer to FIG 3 24 shows how the two power supplies operate in the automatic parallel mode As seen from FIG 3 24 load variations should be confined to the stabilization region of SUPPLY 2 since there is an inital adjustment error between the two supplies SUPPLY No E b m gt gt oo ga RATED Sz a OUTPUT CURRENT BAND Bz oo oe TED C RRENT BAND el DIFFERENCE VOLTAGE OUTPUT VOL AGE BETWEEN SUPPLY No 1 SUPPLY No 1 8 AND SUPPLY No 2 OUTPUT VOLTAGE SUPPLY No 2 CURRENT LIMIT SUPPLY AND No 2 CURRENT LIMIT SUPPLY No 1 OUTPUT CURRENT lo FIG 3 24 AUTOMATIC PARALLEL OPERATION TWO SUPPLIES 3 106 If stabilized output current rather than stabilized output voltage is desired all previous comments are valid 3 107 3 26 except that error sensing is not needed For stabilized output current the Current Control of the supply operat ing initially in the voltage mode SUPPLY 2 is readjusted counterclockwise to such a value that SUPPLY 2 just switches to the current mode observe front panel MODE indicators PROCEDURE AUTOMATIC PARALLEL CONNECTION Note The parallel connection of two ATE power supplies is descri
61. hout connecting the load to the power supply turn LEVEL control fully clockwise 2 Turn A C POWER SWITCH CIRCUIT BREAKER on observe the front panel VOLTMETER and set VOLTAGE CONTROL to the desired value at which the crowbar must trigger NOT to the actual operating voltage 3 Depress the DISABLE button and keep it depressed while turning the LEVEL control counterclock wise until the crowbar INDICATOR energizes simulated crowbar action 4 Turn VOLTAGE CONTROL slightly counterclockwise to the actual operating voltage Release the DISABLE button NOTE This last adjustment established the threshold i e the difference voltage between the output voltage and the voltage at which the power supply will crowbar For minimum false triggering use the largest threshold your load can tolerate 5 To check the adjusted crowbar trigger level depress DISARM push button and turn VOLTAGE CON TROL clockwise Observe front panel VOLTMETER and note the voltage at which the crowbar INDI CATOR lamp energizes Correct LEVEL adjustment as described above if necessary Reduce power supply output voltage to its operating value NOTE 1 Readjustment of the LEVEL control may be required after load and power supply have reached thermal equilibrium NOTE 2 If an exact crowbar point at a remote load must be established remote error sensing as described in 3 6 par 3 21 must be used ATE 1 2 2578 3 34 3 35 3 36
62. ifier has previously been shown in an application for external current control See par s 3 57 to 3 63 Since both inputs of the EXT CURRENT COMPARISON AMPLIFIER are available at the REAR PROGRAMMING CONNECTOR 12 it can be used adavantageously to control the power supply output in response 10 feedback from such divers physical phenomena as light temperature pressure chemical reactions and the like Since the open loop gain of this third control channel is very high only minute feedback signals in combina tion with an appropriate external control are required The design of the required external circuitry is shown by means of the following example A targer object requires constant illumination supplied by a lamp which is connected at the power supply output The feed back is supplied by a photo cell the output of which is O 100mV depending on the light input A Brightness Control is required to adjust various illumination levels Note Depending upon the characterisitics of both lamp and photo cell fast mode operation of the ATE might be advisable NOTE Rcc BRIGHTNESS 0 100 mv ALTERNATE REMOVE JUMPER e 15 ae 1002 CONTROL m BRIGHTNESS ON 12 WHEN US Fh CONTROL ALTERNATE BRIGHTNESS 1 71 CONTROL pouce 17 5 15 www w am NIZ a FROM VOLTAGE C CHANNEL EXT CURRENT PREAMPL B COMP AMPL 55 ELEME
63. irectly at the load terminals these cases the output capacitor is discon nected at the power supply and brought with a heavy twisted wire pair directly to the remote load refer to FIG 34 REMOVE LINKS 1 2 3 AND 5 6 7 ON TB20I V B AG SOURCE 17 INPUT TO AC INPUT SOURCE 150 49 1 2 RACK ATE POWER SUPPLY FIG 3 5 LOAD CONNECTION METHOD 111 Since the output capacitor is now removed from the output terminals of the power supply and directly con nected to the load it may be possible in some cases that it can no longer perform its bypass function as far as the power supply is concerned If oscillations are observed at the output or at the load should be left connected in the power supply by connecting 1 3 and 5 7 on TB201 The load should be decoupled with another high quality capacitor of a value equal to or greater than Cg Alternately good results can some times be achieved by disconnecting the internal Cg and operating with an externaly bypass capacitor across the load exclusively For pulsed loads which drop to zero current during the off period any external output capacitor should be paralled with a bleeder resistor The value of this resistor is determined by the value of the external capacitor the desired response and the amount of output current which can sacrificed As minimum the RC time constant of the external output capacitor ext and the b
64. istive capacitive or inductive parameters it may be located very close to the power supply or it may be a considerable distance away The power supply designer cannot anticipate every conceivable application location or nature of the load He must design his product for the widest possible application range and specify the performance at the output terminals of the power supply The aim of the following paragraphs is to aid the user in the final use of the product The interface of the power supply and the load The perfect interface between a power source and its load would mean that the specified performance at the output terminals would be transferred without impairment to any load regardless of its characteristics distance from the power supply or environment To approach this ideal the power supply must satisfy certain require ments interconnecting rules must be closely followed and Ohm s Law as well as basic a c theory must be considered in selecting the interface wiring LOAD WIRE SELECTION The stabilized d c power supply is definitely not an ideal voltage or current source with zero output impedance VOLTAGE MODE or infinite output impedance CURRENT MODE at frequencies All voltage sources have some amount of impedance which increases with frequency and all current sources have an output impedance which decreases with frequency refer to FIG 3 1 VOLTAGE MODE IMPEDANCE INCREASING Ze DUE TO OUTPUT CI
65. ital LCD meters 1 16 MODEL SUFFIX L This option replaces the front panel knobs with locking type screwdriver adjustable controls It may be applied to either or DM models ATE 1 2 11 1910 1 5 1 6 d310N SV 1d30X3 g 0 ZELF SNOISN3MIQ 83H10 TIV o 15 OL SNOISN3WIG T3NVd LNOUS SATOH ONILNNOW V SJONVUJTOL SH313WI TW NI SHY SISSHINSHVd NI SNOISN3MIG 9 ONLLNNOW JOHL ONIOVIYHL STAS 8 5 X 81 8 1334 199 OLSV1d p s SISSVHO 30 WOLLOS WOH 1333 ONILNNOW NOV SUNLXAL TANIA 1VOOUVHO H3A09 9 05795 ON 365 015 Yad LHOIT LNOH 8 HSVM 3 LVWOHHO 31V71d 31v1d ovd ONY SISSVHO v THSINIA S W O VB 81 ON 83AO2 9 WANIWNTY SII LNOUS 8 VO 9L ON 31V1d HOVE ONY SISSVHO v 7wiualvw z 8 0 926 31V WS L 0sis1V wWsz o0LsiV We s231V gt NW9 9931V 99 96 ALY wWoi scalv 91 96319 WSZ 931V 6 SNIMOT10J 3H1 5 S DNIAVUG SIHL L SALON o 2n twas 312 9 rexien 2 1 8 29 000000 O31V3711N3A 1 1 1 07777778 9 t t D 1334 zot dMOO 60 102 N 19313 WINDY 57 03345
66. ithout connecting the power supplies to the load turn a c power and adjust the output voltage on each supply to the required level the sum of the output voltages will be the voltage applied to the load Adjust the current contro on each power supply to its extreme counterclockwise position Turn a c power off Connect a short circuit consisting of a short wire across the output terminals of each power supply Turn a c power on and adjust each ATE Current Control to the required load current Turn a c power off Remove shorting wires from output terminals Make all load connections as shown in the diagram refer to FIG 3 20 Turn power on Observe output metering and front panel MODE indicators The output current should be identical on all series connected supplies and all supplies should operate in the voltage mode VOLTAGE MODE indicator on On those supplies not operating in the voltage mode turn current control slightly clockwise until the VOLTAGE MODE indicator energizes If current mode operation is desired turn one front panel current control slightly counterclockwise such that the CURRENT MODE indicator is just energizing the remaining supply supplies should remain in the voltage mode of operation Operation can now proceed 1 2 RACK ATE POWER SUPPLY REMOVE JUMPER 29 32 ON PC 12 OF ALL UNITS TO AC INPUT SOURCE 150 491 1 2 RACK ATE POWER SUPPLY ATE 1 2 2
67. leeder resistor Ro ext should be comparable with the internal output capacitor Cg and the bleeder resistor Ro so that Ro ext ext lt NOTE Cg C208 Ro R11 11 000pF 3300 for ATE 6 25M DM 5 8000uF 500 for ATE 15 15M DM 2 900uF 7500 for ATE 25 10M DM 2 400uF 1 5KQ for ATE 36 8M DM 1 400uF 12KQ for ATE 55 5M DM 850uF 22KQ for ATE 75 3M DM 375uF 7 5KQ for ATE 100 2 5M DM 275uF 12KQ for ATE 150 1 5M DM 150uF 62KQ for ATE 325 0 8M DM NOTE There is unfortunately no best method for interconnecting the load and the power supply Individual 3 27 3 28 applications location and nature of the load require careful analysis in each case Grounding a single point in the output circuit is of great importance It is hoped that the preceeding paragraphs will be of some assistance in most cases For help in special applications or difficult problems consult directly with Kepco s Application Engineering Department VOLTAGE MODE OPERATION FRONT PANEL CONTROL Once the load is connected to the output terminals of the ATE Power Supply and safety as well as grounding rules have been applied as described refer to par s 3 1 through 3 26 power supply operation can proceed 1 Turn VOLTAGE CONTROL completely counterclockwise Turn A C POWER SWITCH CIRCUIT BREAKER on The voltage mode VIX indicator should be on Observe front panel VOLTMETER and adjust VOLTAGE CONTROL to the desired
68. lication requiring a voltage supply from O to 91 volts into a common load the coupling resistor is selected as follows Let Eom 0 55V MASTER SUPPLY then the SLAVE SUPPLY Eos must vary from zero to 36 volts as the MASTER supply is varied over its output voltage range Calculating the coupling resistor 10K 45K ohms and connecting the system as shown in FIG 3 22 will produce the desired result m ATE 1 2 2578 3 23 3 100 PROCEDURE MASTER SLAVE SERIES OPERATION WITH TWO OR MORE ATE SUPPLIES 3 24 1 2 3 4 5 6 7 216 3 22 MASTER SLAVE SERIES CONNECTION ATE POWER SUPPLIES WITH GREATER THAN 6V OUTPUT VOLTAGE ONLY Connect each individual ATE power supply to be connected in series to the a c power line Adjust the front panel Current Control on each ATE completely counterclockwise Connect a short circuit consis ting of a short wire length across the output terminals of each ATE supply Turn power and adjust ATE Current Contro to the required load current plus 5 Turn a c power off remove short circuii Interconnect power supplies as shown in FIG 3 22 Note Only one SLAVE unit is shown but more can be added Turn MASTER supply VOLTAGE CONTROL to its maximum counterclockwise position Turn ac power on Observe front panel MODE INDICATORS All VOLTAGE MODE indicators should be on and all front panel meters should read approximately zero Slowl
69. m the negative monitor terminal to the metal chassis of the power supply If this internal network is not desired the connection to the chassis can be opened by removing the link 8 9 on TB201 See FIG 2 3 FAST MODE CONVERSION OF THE ATE POWER SUPPLY Power supplies designed to operate in a voltage as well as in a current stabilizing mode often represent a compromise between the conflicting requirements of a good voltage and a good current source A good voltage source must have ow output impedance good output voltage stability and good dynamic stability in the presence of loads with capacitive and or inductive content achieves these design goals by relying to a great extent upon a large output capacitor having a very low terminal impedance large energy storing ability and great resistance to rapid voltage changes Unfortunately the requirements for a good current source are quite opposite to that of the voltage source described above A current source should have Aigh output impedance and its terminal voltage must be able to assume rapidly any value as may be needed to keep the output current at the predetermined level while the load is changing To satisfy these conflicting requirements the ATE power supply was designed for quick manual change over from the slow mode to the fast mode of operation In the slow mode the ATE power supply approaches an ideal voltage source Heavy output and feedback capacitors provide for l
70. nals are also provided for remote error sensing as well az for the connection of the output capaci tor directly at the load The ATE power supply features user selectable slow or operatiiiy modes Slow mode operation is recommended for applications demanding a constant voltage source Fast mode operation is best if the output voltage must change rapidly either in response to an external programming signal or if the ATE is used as a current stabilizer as a reaction to changing load resistance The ATE power supply is delivered for slow mode operation See Section 11 par 2 4 for converting the ATE power supply to fast mode operation An overvoltage protection circuit continuously adjustable as well as remotely programmable is a built in feature The trigger point of the overvoltage protector may be set or checked under actuel operating condi tions by the front panel accessible setup controls refer to Section of this manual ATE power supplies are built in several mechanical sizes according to their approximate output power ratings APPROX OUTPUT POWER QUARTER RACK MODELS 50 WATT QUARTER RACK MODELS 100 WATT HALF RACK MODELS 250 WATT THREE QUARTER RACK MODELS 500 WATT FULL RACK MODELS 1000 WATT Power transistors and drivers on all ATE designs are mounted onto highly efficient patented heat sink assem blies which are cooled by low noise fans The ATE main chassis assemblies as well as the wrap around
71. ne of the following to the ATE chassis GND terminal 1 the return of the programmind source 2 the corresponding output terminal of the ATE or 3 the corresponding Load terminal In addition make sure that all devices are tied to the same GND con nection it is recommended that all devices in use by powered by the same a c outlet E FIGURE 3 29 CORRECTIONS Ea 6V to 100V models Ea 0 to 1V 150V and 325V models Ea 0 to 0 5V Eb All models Eb 0 to 10V F PAR 3 117 CORRECTIONS PREAMP is used to perform signal back to the required level 0 to 10V G PAR 3 118 CORRECTIONS Rb 6V to 100V models Rb 100K Ohms 150V models Rb 49 9K Ohms 325V models Rb 16 2K Ohms H PAR 3 119 CORRECTIONS Gain 6V to 100V models Gain 10 150V and 325V models Gain 20 Rf ext 6V to 100V models Rf ext 10K Ohms 150V and 325V models Rf ext 20K Ohms For 325V models add sentence to Note Note The selected resistors tolerance of 1 Ra and Rb should have a power rating of 0 5W and voltage rating of 500V minimum They should be wired Declaration of Conformity Application of Council directives 2006 95 EC LVD 2004 108 EC EMC Standard to which Conformity is declared IEC61010 1 3rd Edition Safety requirements for electrical equipment for measurement control and laboratory use designed to meet EN55011 Class A conducted and radiated Limits and Methods of Measurement
72. nfiguration The choice between these two methods will depend on the application at hand If individual power supply control is desired the Automatic series connection should be used If the output of the inter connected power supplies is to be controlled simultaneously the MASTER SLAVE method is recommended For either method some general rules should be remembered 1 2 3 4 5 6 ATE 1 2 2578 Series connect supply only up to a total of 500 volts output voltage this is the isolation voltage limit for the ATE power supply Series connect supplies if they have the same current rating Otherwise reduce the current limits to a value equal to the lowest output current rated power supply Use error sensing as shown in the diagram See FIG 3 20 to compensate for load wire drops NOTE SENSING LEADS ARE NOT REQUIRED IF THE APPLICATION CALLS FOR CURRENT MODE OPERATION EXCLUSIVELY The load wires should be as short as practicable Select the load wires as heavy as possible and twist the load wire pair tightly Approximately equal lengths of load wire between each pair of supplies is recommended Use the Fault Detection Loop as described in par 3 91 All previously described programming circuits may be used on the MASTER power supply to program the series connected system 3 21 396 PROCEDURE AUTOMATIC SERicS CONNECTION 322 1 2 3 4 5 6 FIG 3 20 AUTOMATIC SERIES CONNECTION W
73. npacking and before permanent installation is advisable to ascertain whether the power supply has suffered damage resulting from shipment Refer to FIG 2 2 and to FIG 2 3 for the location of the operating controls and output terminals a Connect power supply to 115V a c source or refer to par 2 4 for other input voltages if required b CURRENT CONTROL fully clockwise Turn VOLTAGE CONTROL fully counterclockwise Turn POWER SWITCH CIRCUIT BREAKER The VOLTAGE VIX indicator should be gized Slowly turn VOLTAGE CONTROL clockwise and observe the gradual increase of the output voltage The VOLTMETER should now read full scale Check the overvoltage crowbar circuit as follows 1 Turn the VOLTAGE CONTROL to about one half of its range 2 Depress the DISARM push button and turn the recessed LEVEL control slowly counterclockwise until the CROWBAR INDICATOR lamp lights up 3 Turn VOLTAGE CONTROL slightly counterclockwise and release DISARM button 4 To reset the adjusted crowbar point press DISARM button again and advance VOLTAGE CON TROL clockwise Note voltage at which the CROWBAR INDICATOR lights up Readjust LEVEL control if necessary by repeating step 2 and check again by repeating steps 3 and 4 5 Turn A C POWER SWITCH CIRCUIT BREAKER e Place a short circuit across the ATE output terminals Turn CURRENT CONTROL counterclockwise Turn the ATE on THE CURRENT MODE in
74. nsing from the error sensing terminal reconnect it to the output terminal and remove C26 thus successfully solving the problem described See FIG 3 27 DISCONNECT DISCONNECT R48 FROM C26 HERE POSITION SHOWN WITH SOLID LINES AND RECONNECT TO POSITION SHOWN WITH DASHED LINES Al ASSEMBLY COMPONENT SIDE SIMPLIFIED TO REAR PROGRAMMING CONNECTOR PC 12 FIG 3 27 LOCATION OF OVERVOLTAGE SENSING LEAD DISCONNECT 3 30 ATE 1 2 2578 3 114 PROCEDURE REDUNDANT PARALLEL OPERATION 1 Remove covers from both ATE power supplies locate A 1 P C card and rewire overvoltage sensing as described in par 3 113 and as illustrated in FIG 3 27 Remove capacitor C26 as described in par 3 113 and as illustrated in FIG 3 27 2 Make all load and sensing connections as shown in FIG 3 28 3 Turn a c power on and set both ATE supplies to the desired load voltage One of the ATE supplies Supply 1 will invariable be at a slightly higher output voltage than the other Supply 2 Supply 1 will consequently be in control of the load while Supply 2 will be cut off Supply 2 is desired as the controller increase its output voltage slightly until it takes control of the load as evidenced by the read out on its front panel meters It is recommended the loading be at least 10 of the rated maximum ATE output current 4 Test the redundant parallel system by manually shutting off the a c power on the controlling power su
75. of Radio radiated is designed to meet Disturbance Characteristics of Industrial scientific and radio frequency equipment EN61000 4 11 EN61000 4 4 Level 3 Voltage Dips Fast Transient EFT EN61000 4 2 Level 4 EN61000 4 5 Level 4 ESD Level 4 Surge Immunity Criteria B Flicker Designed to meet IEC61000 3 3 IEC61000 4 3 designed to meet Radiated Immunity designed IEC61000 4 6 IEC61000 4 8 to meet Conducted Immunity Magnetic Field Immunity designed to meet Manufacturer s Name KEPCO INC Manufacturer s Address 131 38 SANFORD AVENUE FLUSHING NY 1135 USA OP Importer s Name T V Importer s Addres Type of Equipment omponent Power Supply Model Series ATE 50W 100W 4 Rack 250W Rack 500W Rack 1000W Full Rack all models all options Model No Year of Manufacture I the undersigned declare that the product specified above when used in conjunction with the conditions of conformance set forth in the product instruction manual complies with the requirements of the Low Voltage Directive 2006 95 EC which forms the basis for application of the CE Mark to this product Place Kepco Inc 131 38 Sanford Ave Flushing NY 11355 USA Date Mark Kupferberg Full Name Executive Vice President position 228 1765 REV 1 Dec of Conf JQE 100W 250W 500W 1000W A Conditions of Conformance When this product is used in applications governed by the req
76. output voltage level Turn a c power off ATE 1 2 2578 3 5 3 29 3 20 3 31 3 32 3 33 2 Turn the current control completely counterclockwise 3 Apply a short circuit across the output terminals of the ATE Power Supply Turn A C POWER SWITCH CIRCUIT BREAKER on the current mode VIX indicator should be 4 Observe front panel CURRENT METER and adjust CURRENT CONTROL to the required load current value plus 2 In voltage mode operation this setting will determine the voltage current crossover point Turn A C POWER SWITCH CIRCUIT BREAKER off 5 Remove the short circuit from the output terminals The power supply is now ready for operation CURRENT MODE OPERATION FRONT PANEL CONTROL Note Refer to Section I par 2 14 for fast mode conversion of the ATE Apply all safety and output grounding rules as described in previous paragraphs refer to par s 3 1 through 3 16 Proceed as follows 1 BEFORE connecting the load to the power supply output terminals Turn A C POWER SWITCH CIRCUIT BREAKER on the voltage mode VIX indicator should be on Observe the front panel VOLTMETER and adiust the VOLTAGF control to the required compliance output voltage level Turn A C POWER SWITCH CIRCUIT BREAKER and connect a short circuit to the output terminals of the ATE 2 Turn A C POWER SWITCH CIRCUIT BREAKER on Observe the front panel CURRENT METER and adjust CURRENT control to the desired valu
77. output voltage programming signal can simultaneously be applied to the overvoltage protector so that the crowbar level automatically tracks the output voltage level of the ATE Typical xamples of these programming applications are presented in the following paragraphs REMOTE CROWBAR LEVEL CONTROL WITH AN EXTERNAL 0 10 VOLT D C 1 mA SIGNAL The ATE crowbar level can be remotely controlled by an external O to 10 volt 1 mA d c contro source One example of such a contro source is the SN 488 Digital Programmer which responds to digital input signals and can be controlled by computer or manually The output of the SN 488 is from zero to 10 volts or O to 1 volt per channel and serves as the input to the ATE overvoltage protector PROCEDURE CROWBAR LEVEL CONTROL WITH AN EXTERNAL SIGNAL 1 Turn front CROWBAR SET LEVEL completely counterclockwise 2 Connect a substitute LOAD and the EXT CONTROL SOURCE to the ATE as shown in FIG 3 14 Set the EXT CONTROL SOURCE to its maximum value 3 Turn the ATE on and adjust the front panel VOLTAGE CONTROL to the desired crowbar level i e the level at which the ATE is to shut down not to your load voltage level NOTE Monitor the power supply voltage either by means of the front panel meter or if required connect a precision voltmeter across the load 4 Slowly reduce the level of the EXT CONTROL SOURCE and note if the ATE shuts down at the correct crowbar level 5
78. ow output noise excellent voltage stability and good transient response In the fast mode the output and main feedback capacitors are com pletely removed thereby providing the characteristics of a wide band amplifier ideal for applications requiring a current stabilizer or for high speed voltage or current programming MANUAL CHANGE OVER SLOW FAST MODE The ATE power supply is normally delivered for operation in the slow mode By changing jumper connections at the rear of the power supply the user can quickly convert from the slow mode to the fast mode or vice versa See FIG 2 5 ATE 1 2 2578 2 5 T8201 DC OUTPUT Onor STEP 1 Remove Links 1 2 and 6 7 on T8201 This removes the output capacitor Co STEP 2 Remove jumper 1 2 on PC 12 This removes the main feedback capacitor STEP 3 Connect wire jumper on PC 12 from 16 to 26 This connects a fag network 150 294 2 318 i34 Bi STEP 4 Remove Links 8 9 from 201 156 35 INPUT 4 This removes the internal grounding 138 371 9N network He r p DOO DNE 144 431 5 Connect wire jumper from 12 to ize 25 on 12 This introduces a 150 491 00 To neut required delay in the crowbar circuit 1 2 RACK ATE POWER SUPPLY FIG 2 5 REQUIRED STEPS FOR ATE FAST MODE CONVERSION 2 18 2 19 2 20 2 6 PRECAUTIONS The output capacitor and
79. ply The fixed gain of the ATE voltage channel is given by GAIN Eg max 10 where max is the maximum rated output voltage of each ATE model In the Current Mode of operation the effect of the preamplifier offsets on the tctal output current may be expressed as a percen tage of l max by the equation pream Alo ee x 100 5 For Kepco ATE 325 0 8M the maximum output ripple and noise is 10mV rms and 50mV TABLE 1 2 OUTPUT EFFECTS OFFSET VARIATIONS AND RIPPLE SPECIFICATIONS 9 OUTPUT RANGES See Table 1 1 for specific ratings of each model 1 VOLTAGE MODE 0 100 of rated voltage 2 CURRENT MODE 0 100 of rated current Useable range limited to approximately 1 to 100 The maximum current is factory set to 105 of the rated output current e OPERATING TEMPERATURE RANGE 0 C to 65 C No derating to 55 C derate 10 of listed max imum output current values in Table 1 1 for operation to 65 C ambient temperature f STORAGE TEMPERATURE RANGE 40 C to 85 C COOLING High efficiency single bearing fans permanently lubricated with special low noise non metalic blades ATE A E 1286A h k 1 4 ISOLATION A maximum of 500 volts d c or p p can be connected between chassis and either out put terminal The common mode current from either output terminal to ground is less than 5zA rms or less than 50 z at 115V a c 60 Hz DYNAMIC SPECIFICATIONS 1
80. pply The other supply should now deliver the power to the load PC 12 ao DC OUTPUT x o 0UT EN AC SOURCE N INPUT HIN 150 491 i K TO AC INPUT 0 SOURCE OO 1 2 RACK ATE POWER SUPPLY LOAD SUPPLY 1 PC 12 D OUTPUT OO 00 AC INPUT SOURCE 50 491 1 2 RACK ATE POWER SUPPLY SUPPLY 2 FIG 3 28 REDUNDANT PARALLEL CONNECTION WITH ATE POWER SUPPLIES ATE 1 2 2578 3 31 3 115 PROGRAMMING WITH REFERENCE TO THE NEGATIVE POWER SUPPLY OUTPUT 3 116 ATE power supplies may be used in many unique applications The two uncommitted ATE preamplifiers make it possible to solve application problems which would require special circuitry or additional equipment with standard power supplies One example of such an application problem is the case in which the programming common must be the negative output side of the power supply rather than the positive side With standard power supplies either the programming source would have to be completely isolated or an isolating interface would be required 3 117 This problem is readily solved by the ATE power supply See FIG 3 29 PREAMP is used to perform as a differential attenuator permitting a level shift of the programming source while PREAMP B brings the programming signal back to the requied level 0 10 Ro Rb Ri ext Rt ext PROGRAMMING SOURCE Ep O
81. rces can be used to control the ATE voltage channel By means of one or both of the ATE s uncommitted preamplifiers the external control potential can be amplified inverted and or summed with an internal d c signal Alternately the preamplifier can be used to perform remote two terminal resistance programming of the ATE voltage channel As seen in FIG 3 7 the INT REFERENCE SOURCE 6 2V 1 mA is connected to PREAMP and the external input feedback components are calculated to produce the required 0 to 10 volts control signal from the preamplifier output PART OF 12 DRIVER CKT ext Rr 5 7K VOLTAGE COMPARISON AMPLIFIER text Ib CAL int REF SOURCE COMMON dc gt 6 2V Ima FIG 3 7 TWO TERMINAL RESISTANCE PROGRAMMING OF THE VOLTAGE CHANNEL USING PREAMP A AND THE INTERNAL REFERENCE SOURCE ATE 1 2 2578 3 47 Refer to FIG 3 7 The preamplifier functions here in the inverting configuration producing its output voltage Ep which is made equal to the required contro voltage E according to the equation Ep 1 where Ext Reference resistor r Ep Preamplifier output voltage equal to the required control voltage Ei Eref Internal Reference Voltage 6 2V Ext Feedback Resistor Voltage Control Since the ratio Eret Rp may be expressed as a control current Ip Eq 1 can be simplified to read Ep Eg Preamplifier 8
82. rent Mode Operation Front Panel Control 3 6 Overvoltage Crowbar Setup and 3 6 Introduction to Remote Control of the ATE Output 3 7 Programming the Voltage Control 3 7 Output Control with an External 0 10 Volt D C Control pm 3 7 Voltage Control with a Two Termina 3 8 Voltage Control with a High Impedance Control 3 10 Programming the Current Control METTE 3 12 Output Current Control with an External Control 5 3 12 Output Current Control with Two Terminal Resistance 3 13 Programming the Overvoltage 3 15 Remote Crowbar Level Control with an External 0 10 D C 1 mA Signal 3 15 Automatic Tracking Control of the Crowbar Level 3 16 Programming Output Voltage and Output Current 3 17 The Use of the EXT CURRENT COMPARISON AMPLIFIER for General Feedback 3 19 Multiple Power Supply and Systems Operation
83. s all the other manuals for specials or MG models derived from it as indicated A PAR 3 8 PARALLEL OPERATION OF ATE MG MODELS POWER SUPPLIES Add the following note NOTE THE FOLLOWING CAUTION When connecting units in parallel use an external master ON OFF circuit breaker or switch to simultaneously turn on off all units connected in parallel The individ ual circuit breakers should be left in the ON position working as an overcurrent and over voltage protection circuit and should not be used as a power ON OFF switch If the above recommendations are not met the internal turn off overshoot eliminator cir cuit could be damaged to the point where it is no longer operational B SECTION III FIGURES 3 4 3 5 3 6 3 8 3 10 3 14 3 15 3 16 3 20 3 22 3 25 3 26 3 28 3 30 These diagrams show the load connected using remote sensing For local sensing leave the links between TB201 terminals 2 and 3 M and between terminals 5 M and 6 in place Discon nect the remote sensing wires from TB 201 terminals 2 S and 6 S to the load C PAR 3 37 through 3 90 REDUCING RISE TIME DELAY WHEN USING EXTERNAL PROGRAMMING EITHER FAST OR SLOW MODE To reduce the rise time delay make sure that for the low level of the programming signal the output voltage has a small value at least 0 196 of nominal with the correct polarity D PAR 3 115 PROGRAMMING WITH REFERENCE TO THE NEGATIVE POWER SUPPLY OUTPUT
84. sed in place of it 3 Electric Shock Hazards This product outputs hazardous voltage and energy levels as a function of normal operation Operators must be trained in its use and exercise caution as well as common sense during use to prevent accidental shock This symbol appears adjacent to any external terminals at which hazardous voltage levels as high as 500V d c may exist in the course of normal or single fault condi tions This symbol appears adjacent to any external terminals at which hazardous voltage levels in excess of 500V d c may exist in the course of normal or single fault condi tions gt gt 228 1352 SAFETY COVER REMOVAL 062810 C D BLANK PARAGRAPH 1 1 1 3 19 1 10 1 11 1 12 1 14 2 1 2 3 2 4 26 2 10 2 13 2 14 3 1 3 3 3 6 3 12 3 16 3 19 3 21 3 24 3 27 3 29 3 31 3 34 3 37 3 41 3 45 3 51 3 57 3 60 3 64 3 70 3 72 3 75 3 78 3 84 3 91 3 94 3 103 3 115 3 121 TABLE OF CONTENTS PAGE SECTION I INSTRUCTION Scope or Manual a5 un ene au ate a teet eet hie eid ng o serito 1 1 General Description zu se Re ed NE Me Wek a PIRA eee 1 1 Specifications Electricals mea uu a eA Renee qui ee Bg Wt Ee NE Lx GERE 1 2 MisceManseo s Feat res xa ee a REA ECRIRE x ce 1 5 1 6 Mechanical 5 et intu Moo M Ee ced ata bus ass 1 5 1 6 AGCESSONIES uS RA IRE
85. shield single ended returned to the single d c ground point In cases where externa programming sources are used additional precautions are required If all other grounding problems have been solved and a single ground point has been assigned to the system the programming source must be evaluated for system compatibility Some of the older signal generators for example cannot be successfully used for programming since their cases are connected permanently to one of the output leads Aside from these initial problems the power supply load system must have the correct polarity for voltage programing g the programming source common must be connected to the previously grounded output side If this is not possible because of polarity considerations three choices are open either the programming source must be floated i e it must operate above ground by an amount given by the output voltage of the power supply or the selected d c ground point must be changed to the polarity coinciding with that of the programming source or the polarity of the programming source must be reversed by using the uncommitted preamplifiers of the ATE as descirbed in this section POWER SUPPLY LOAD INTERFACE The general function of a voltage or current stabilized power supply is to deliver the rated output quantities to the connected load The load may have any conceivable characteristic It may be fixed or variable it may have predominantly res
86. tput voltage which is made equal to the required voltage E according to the equation Ej Ep x R Eq 1 where w R Ext Reference resistor Rr Preamplifier output voltage equal to the required drive voltage E ni Internal Reference Voltage 6 2V Ext Feedback Resistor Current Control Since the ratio Eret Rr may be expressed as a contro current Ip 1 can be simplified to read E Ep IDR 2 3 67 Ifl is selected to be 1 mA for example control current from approximately 0 1 to 1 mA can be selected a 0 to 1K ohm rheostat decade or other variable resistance will produce the required 0 1 volt control potential thereby control the ATE output current from zero to its maximum rated value If a 0 1K ohm voltage control resistance is not available the control current 1p can be changed to accommodate the available resis tance value making use of the preamplifier output equation Eq 2 If for example a 1 5K ohm precision potentiometer is available the control current lp must be 1V 1 5KQ 0 66 mA Since the built in INT REF SOURCE is a nominal 6 2 volt the external must be 6 2V 0 66 mA 9 4KQ which can be made up from a 8KQ fixed and a 2KQ trim resistor Ip CAL ATE 1 2 2578 3 13 3 68 PROCEDURE ATE OUTPUT CURRENT CONTROL WITH A TWO TERMINAL RESISTANCE 1 Connect the external components the LOAD an
87. ttery operated to avoid ground loops 1 Close 1 Set CURRENT CONTROL SIGNAL to zero Check the PRECISION VOLTMETER M2 for zero reading and correct if necessary with the power supply lo ZERO control 2 Set CURRENT CONTROL SIGNAL to its maximum value Observe M2 and calibrate the power supply output current to the exact maximum rated value by adjusting the external control voltage Channel B full scale cal control 3 Set CURRENT CONTROL SIGNAL to zero again re check the previously calibrated zero point M2 and correct with the power supply I ZERO control if required Open 1 Operation can now proceed Check the output by means of an oscilloscope for dynamic stability and output ripple amplitude Refer to PAR 3 6 if high ripple is present If the power supply output is dynamically unstable oscillations review the paragraphs on power supply load interface and grounding PAR s 3 6 through 3 26 ATE 1 2 2578 3 84 3 85 3 86 THE USE OF THE EXT CURRENT COMPARISON AMPLIFIER FOR GENERAL FEEDBACK CONTROL The output of the ATE power supply is normally controlled either by the VOLTAGE COMPARISON or by the INT CURRENT COMPARISON AMPLIFIER depending on the prevailing operating mode A glance at the SIMPLIFIED SCHEMATIC DIAGRAM See end of Section 111 however shows that a third control channel is available via the EXT CURRENT COMPARISON AMPLIFIER which is normally biased off The use of this ampl
88. uirements of the EEC the following restric tions and conditions apply 1 For European applications requiring compliance to the Low Voltage Directive 73 23 EEC this power supply is considered a component product designed for built applications Because it is incom plete in construction the end product enclosure must provide for compliance to any remaining electri cal safety requirements and act as a fire enclosure EN61010 1 2001 Cl 6 CI 7 8 and Cl 9 This power supply is designed for stationary installation with mains power applied via a detachable power supply cord or via direct wiring to the source power terminal block This power supply is considered a Class 1 earthed product and as such depends upon proper con nection to protective earth for safety from electric shock EN61010 1 Cl 6 5 4 This power supply is intended for use as part of equipment meant for test measurement and labora tory use and is designed to operate from single phase three wire power systems This equipment must be installed within a suitably wired equipment rack utilizing a three wire grounded mains con nection See wiring section of this manual for complete electrical wiring instructions EN61010 1 CI 6 5 4 and 6 10 1 This power supply has secondary output circuits that are considered hazardous and which exceed 240 VA at a potential of 2V or more The output wiring terminals of this power supply has not been evalu
89. urrent mode operation All CURRENT MODE indicator s on the SLAVE supplies should be on ATE 1 2 2578 TO AC INPUT SOURCE 150 491 1 2 RACK ATE POWER SUPPLY MASTER LOAD ON 12 REMOVE JUMPERS 29 52 ALL UNITS 15 23 ON SLAVE ONLY DC OUTPUT C OUT O REMOVE AC SOURCE 7 INPUT gt TO AC INPUT 50 4 i SOURCE 1 2 RACK ATE POWER SUPPLY SLAVE FIG 3 26 MASTER SLAVE PARALLEL CONNECTIONS ATE 1 2 2578 329 3 111 REDUNDANT PARALLEL OPERATION 3 112 Two ATE Power Supplies can be connected in parallel to a load in such a way that if one of the power supplies fails or is interrupted in any other manner the other will continue to supply uninterrupted load current The two power supplies are isolated from each other by means of external diodes D1 D2 in FIG 3 28 which must be rated for the maximum load voltage and current of the ATE units used 3 113 The problem encountered in operating power supplies with overvoltage detection circuits in a redundant parallel configuration is that the overvoltage sensing leads are ususally permanently wired to the error sensing leads If now an overvoltage occurs on either power supply both supplies will shut down defeating the purpose of the redundant circuit In the ATE power supplies provisions are made on the control circuit P C card A1 to disconnect the overvoltage se
90. y turn MASTER voltage controi clockwise until the desired output voltage level is reached The load voltage is the sum of the MASTER and all SLAVE output voltage as read out on each front panel output voltage meter All output current meters should read the identical load current Set the output current limit point by turning the current control on all series connected supplies coun terclockwise unti each supply just transfers into the current mode CURRENT MODE indicator on then turn each slightly clockwise again until each VOLTAGE MODE indicator energizes again If current mode operation is desired leave the setting of the Master current control such that the CURRENT MODE indicator is energized While the output current now be controlled by the Mas ter supply the Slave supply will still operate in the voltage mode VOLTAGE MODE indicator and deliver additional compliance voltage to the load ON 12 REMOVE JUMPER 29 32 ON ALL UNITS 21 22 ON SLAVE UNIT ONLY TO AC INPUT SOURCE oror TB20I OUTPUT IN omm ol TEN S m IQs esj N ig E SOURCE INPUT IL I Y HISI Pe 150 491 Koy Oo TO AC INPUT 1 2 RACK ATE SLAVE ATE 1 2 2578 3 101 MASTER SLAVE SERIES OPERATION WITH ATE 6V POWER SUPPLIES Rf PART OF 12 2 e 9 GD GEER ELO CORRE
91. y from approximately zero to the rated maximum output voltage CALIBRATION VOLTAGE CHANNEL Refer to Section FIG 2 1 for the location of all internal power supply controls Refer to your SN 488 system manual for the location of the system calibration controls 1 Open S1 Set VOLTAGE CONTROL SIGNAL to zero Check the PRECISION VOLTMETER M1 for zero reading and correct if necessary with the E ZERO control 2 Set VOLTAGE CONTROL SIGNAL to its maximum value Observe M1 and calibrate the power supply output voltage to the exact maximum rated value by adjusting the external control voltage Channel A full scale cal control 3 Set VOLTAGE CONTROL SIGNAL to zero again re check the previously calibrated zero point on M1 and correct with the power supply ZERO control if required 4 This concludes the calibration of the voltage channel Leave the VOLTAGE CONTROL SIGNAL at approximately 1 3 its maximum setting CALIBRATION CURRENT CHANNEL Note The output current value can be measured directly by means of a suitable ammeter in series with the load or as indicated in FIG 3 16 indirectly by means of the precision voltmeter M1 across a current measuring resistor should be selected such that a convenient range on the precision voltmeter can be used for one ampere output current use a 0 1 ohm resistor to produce 100mV full scale If an electronic voltmeter is used it should be ba

ATE 1/2 Rack (250W) Operator Manual

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