APPENDIX E OPTION 750 Operating Instructions for the Multiple
Contents
1. jack to the jack Depending on range and model number low is generally less than 2K ohms and high is an open overload 11 Table 3 FLT INH RLY Replaceable Parts List REF DES PART NUMBER DESCRIPTION C701 01604830 Cap 2200pF 10 100V C702 0160 4281 Cap 2200pF 20 250V C703 706 01604835 Cap 0 1uF 10 50V C707 710 01604801 Cap 100pF 5 100V C711 714 01604834 Cap 0 047uF 10 100V C715 717 01604835 Cap 0 1uF 10 50V CR701 704 1901 0050 Diode SW 80V 200mA CR705 708 1901 0937 Diode 11DQ Schottky J701 1252 1152 Connector 10 pin J702 1252 1488 Connector 4 pin 1252 1853 Plug Ref J702 J703 1252 1864 Connector 8 pin 1252 1854 Plug Ref J703 R701 703 0686 1015 Fix comp 100 5 1 2W R704 0683 1215 Fix comp 1 21K 1 1 8W R705 0698 3446 Fix comp 383 1 1 8W R706 0757 0401 Fix comp 100 1 1 8W R707 710 0757 0438 Fix comp 5 11K 1 1 8W R711 714 0757 0442 Fix comp 10K 1 1 8W R715 718 0698 3450 Fix comp 42 2K 1 1 8W R719 722 0757 0481 Fix comp 475K 1 1 8W R723 726 0683 1215 Fix comp 1 21K 1 1 8W R727 730 0757 0442 Fix comp 10K 1 1 8W R731 734 0698 8816 Fix comp 2 15K 1 1 8W R735 0683 2255 Fix comp 2 2M 5 1 4W U701 1990 0543 Opto isolator U702 1826 0065 Voltage Comparator LM311 U703 704 1820 3673 Monostable Multivibrator HC123 U705 1826 0138 Voltage Comparator U706 1855 0591 Quad MOSFET VR701 1902 0556 Zener 2017 5 1W IR 5mA VR702 1902 0049 Zener 6 19V 5 0 4W VR703 706 1902 0176 Zener 47V W17 5080 222. 12 Ribbon Cable 9170 1497 Core shield bead 06624 60025 06624 60026 06624 61025 0515 1146 0380 1361 06621 81004 06622 81004 06623 81004 06624 81004 Option 750 Circuit Board GPIB Board Tested Option 750 Board Cover Plate Mounting screws Standoffs 6621A Label 6622A Label 6623A Label 6624A Label 12 FLT INH RLY SORRD Ovi 5v BV A INH mR 3 TO FROM GPIB P209 R723 726 1 21k 9711 4 8711 4 6 i OVE4 5V Figure 7 FLT INH RLY Board Schematic Diagram 13 Schematic Notes 1 All resistors are in ohms all capacitors are in microfarads 2 For components with multiple designations e g R707 710 the lower numbered designation is in the RLY 1 circuit and the higher numbered designations are in the RLY2 RLY3 and RLY4 circuits respectively 3 For IC s with multiple pin numbers e g 6 4 8 10 the left most pin number is in the RLY1 circuit and the pin numbers to the right are in the RLY2 RLY3 and RLY4 circuits respectively 4 The RLY1 and RLY2 circuits use U703 the RLY3 and RLY4 circuits use U704 The left most pin number is in the RLY1 and RLY3 circuits 5 All voltages shown on Figure 7 Option 750 schematic are shown with respect to power supply ground 6 Voltages shown in parenthesis indicate that the value is for the ON or ACTIVE state 05 80060
3. 6214B or equivalent a 3K resistor Agilent PN 0686 3025 or equivalent and an LED Agilent PN 1990 0486 or equivalent 2 Using an ohmmeter Agilent 3456A Agilent 3478A or equivalent Fault Indicator FLT Circuit Testing Using Method 1 a Connect the LED resistor and external 5V power supply to pins 1 and 2 of J702 as shown in Figure 6a and turn on the 662x power supply The LED should be off b Unmask the CV bit bit 1 in the fault register by sending UNMASK lt ch gt 1 c Check to see that the front panel display indicates the supply is in CV mode d The LED should be on e Reset the 662x supply by sending CLR f The LED should be off g Turn off the 662x supply This concludes testing of the FLT circuit EXTERNAL POWER SUPPLY AA ii Figure 6a FLT Test Setup Using Method 2 a Connect an ohmmeter to pins 1 and 2 of J702 and turn on the 662x supply The ohmmeter should indicate a high resistance b Unmask the CV bit bit 1 in the fault register by sending UNMASK lt ch gt 1 c Check to see that the front panel display indicates the supply is in the CV mode d The ohmmeter should now indicate a low resistance e Reset the 662x supply by sending a CLR f The ohmmeter should now indicate a high resistance g Turn off the 662x supply This concludes testing of the FLT circuit Note the polarity of your DMM s ohmmeter output Using an Agilent 3456A in two wire auto range the pola
4. 666 rr CIN U7G3 090005005 00000000 8 Figure 8 FLT INH RLY Component Location 14
5. FT APPENDIX E OPTION 750 Operating Instructions for the Multiple Output Linear System DC Power Supply Agilent Models 6621A 6622A 6623A 6624A 6625A 6626A 6627A 6628A and 6629A FOR INSTRUMENTS WITH SERIAL NUMBERS Agilent Model 6621A Serials Agilent Model 6622A Serials Agilent Model 6623A Serials Agilent Model 6624A Serials Agilent Model 6625A Serials Agilent Model 6626A Serials Agilent Model 6627A Serials Agilent Model 6628A Serials Agilent Model 6629A Serials For instruments with higher serial numbers a change page may be included US37370101 and above US37360101 and above US37360101 and above US37350101 and above US37380101 and above US37370101 and above US37350101 and above US37380101 and above US37380101 and above Agilent Technologies Agilent Part No 5957 6372 l Printed in USA 9 2000 General Information This document describes the operation of a discrete fault indicator FLT a remote inhibit INH and relay controls RLY for the power supply This information is in addition to the standard information provided in the Operating Manual The FLT INH and RLY circuitry is contained on a separate board HP P N 06624 60025 inside the supply See Figure 7 U204 and P209 located on the GPIB board provide a path to transmit signals between the GPIB board data bus and the Option 750 board Table 1 Specifications FLT Indicator Vou High level out
6. ed until the supply receives a RIRST command explained later If the INH input is still true when the supply is reset the outputs will not be enabled The status register of each output contains an additional INH bit which is available only with Option 750 See Figure 2 These INH bits all reflect the state of the single INH input This allows INH to be unmasked to the fault register to generate a fault or SRQ INH is in the ninth position in each status register and has a bit weight of 256 Note that the addition of a register bit does not require any change in the way that the standard programming commands are used RLY Controls The relay controls RLY are designed to be used with external user supplied relay circuitry so that the outputs of the power supply can be physically disconnected from the load or system These RLY controls are available through connector J703 See Figure 1 Each of the four RLY controls can sink 120mA for controlling external relays directly from an external power supply Because they are also open collector they can also provide low true TTL compatible logic levels for connecting to a relay control box The RLY controls are programmed with the RELAY and OUT command explained later They can also be operated using the front panel OUTPUT ON OFF function key Figure 3 shows how to connect either a relay or a logic circuit to the RLY controls External Connections As shown in Figure 1 mechanical connections
7. f a Shottky diode a MOSFET and a 2 15 ohm resistor These components are connected in series across the connector terminals The FET simply acts as switch to open or dose the circuit It closes when the relay RLY line goes high and positive gate voltage is applied to the FET gate The zener diode across the FET and resistor protects the circuit by limiting voltages at the connector terminals to approximately 47Vdc In addition to the basic circuit just described there is additional circuitry consisting primarily of a voltage comparator and a one shot that protects the FET and resistor from damage due to excessive current gt 140mA The voltage comparator compares the voltage drop across the 2 15 ohm resistor to a reference voltage When excessive current causes this voltage drop to exceed a predetermined limit the output of the voltage comparator goes low This turns off the FET by removing its positive gate voltage At the same time the oneshot applies a positive pulse to the negative input of the voltage comparator This keeps the FET off for approximately 1 5ms At the end of 1 5ms the FET is allowed to turn on again If there is still excessive current flowing through the RLY circuit the previously described action is repeated Maintenance The following tests can be performed to ensure that OPTION 750 is functioning properly The FLT and INH tests can be performed using either of two methods 1 Using an external power supply Agilent
8. igure 5 FLT INH RLY Example Principles of Operation This section describes the operation of the FLT INH RLY circuits as shown in the schematic diagram Figure 7 The 662x supply automatically recognizes the presence of Option 750 via the ID line J701 7 U214 8 is pulled high with Option 750 installed FLT CIRCUIT The FLT circuit is shown at the top of Figure 7 U701 is driven by the PON line which momentarily holds U701 off when the supply is first turned on This allows internal nodes within the supply to settle and prevents false triggering of any external FLT circuitry After about one second the PON line goes high and enables U701 When the FLT line from the GPIB board goes high indicating a fault it causes the output of comparator U702 to go low This causes current to flow through the diode of opto isolator U701 which then triggers any external circuitry connected to the FLT output on the rear of the supply VR701 protects the FLT circuit by clamping voltages at U701 to approximately 20Vdc INH Circuit The INH circuit consists of R703 and VR702 See Figure 7 It is activated by pulling the positive INH input to ground VR702 protects the INH circuit by limiting voltages at the INH input to approximately 6Vdc Note that correct polarity must be observed when connecting external circuitry to the INH input RLY Circuit As shown in Figure 7 identical circuitry is used in all four RLY controls The basic RLY circuit consists o
9. isters is true It goes false when all the bits in all the fault registers are false See Figure 2 Because each output has independent status and mask registers each output s status register can be unmasked to generate the FLT signal for different reasons TIGHTEN SCREWS LO NIC N Eseg 05050505060506 FLTZINH RELAY TERMINALS NSERT WIRES HERE ARP4 Figure 1 FLT INH RLY Connections OUTPUT 1 REGISTER STRUCTURE OUTPUT 2 ouTPUT 3 OUTPUT 4 REGISTER REGISTER REGISTER pidas aig E cv 1 1 OUTPUT OUTPUT OUTPUT 2 ran 1 1 1 cC fa 4 EN Neh or is is unr 32 32 Edf oc 64 64 sey FUT 2 E CRA RASO E INH pss Esa ACCUMULATED STATUS REGISTER SERTAL POLL REGISTER FAY ra H 5 2 il RAS 5 a ras e FAU4 a is RDY 16 ES ERR 32 ROS PON E Ese NOT USED IN ALL MODELS Figure 2 Functional Relationship of Status Registers INH Input The inhibit input INH is a low true TTL compatible logic input which is used to remotely disable all outputs of the supply It provides a way to disable the supply that is independent of computer control over the GPIB The INH input signal is applied through connector J702 on the rear of the supply See Figure 1 In addition to disabling the outputs the INH input also opens all RLY terminals When the supply is disabled by the INH input all outputs will remain disabl
10. l ch All four RLY controls are available regardless of the number of outputs in the power supply RELAY gt ch gt Queries whether the RLY control for the specified output channel ch is open or closed The response is either 0 open or 1 closed DC gt ch gt lt on off gt Turns the output off on off 0 or turns the output on on off 1 for the specified output channel ch without affecting the state of the RLY controls DC lt ch gt Queries whether the output for the specified channel ch is turned on or off The response is either 0 off or 1 on DCPON lt on off gt Sets the state of the output and RLY controls at power on For on off 0 the outputs will be off and the RLY controls will be open For on off 1 the outputs will be on and the RLY controls will be closed A CLR command will put the outputs and RLY controls in the power on state DCPON Queries the power on state of the outputs and RLY controls The response is either 0 outputs off RLY controls open or 1 outputs on RLY controls closed RIRST Resets a remote inhibit INH The external remote inhibit signal opens all RLY controls and turns off all outputs RIRST returns the outputs and RLY controls to their previously programmed state If the remote inhibit signal is still true when the RIRST command is programmed the outputs remain off and the RLY controls remain open The meaning of the following standard power supply programming c
11. of relay pins on J703 See Table 2 and turn on the 662x supply Send RELAY lt ch gt 0 to turn off the relay output ch under test The ohmmeter should indicate a high resistance Send RELAY lt ch gt 1 to turn on the relay output ch under test The ohmmeter should indicate a low resistance Repeat steps a through e for each relay output If any of the tests indicate a failure measure the voltages on J701 and compare them to those shown in Figure 7 Option 750 schematic If the measured voltages on J701 are correct trouble shoot the Option 750 board If the measured voltages on J701 are incorrect perform signature analysis on U204 of the GPIB board using the signatures listed below Signature P701 Analyzer Pin Stat _ 11 Stop Y 22 Clock Y 20 Gnd 4 Note 5V signature is 3U9F U204 Input Pin Signature Output Pin Signature 3 1561 2 DACO 4 OFHU 5 066U 7 03F6 6 01P3 8 0020 9 0010 13 0010 12 0008 14 0008 15 0004 17 0004 16 0002 18 0002 19 0001 Note the polarity of your DMM s ohmmeter output Using an Agilent 3456A in two wire auto range the polarity of the internal voltage is reversed current flows from the jack to the jack so the jack of the ohmmeter must be connected to the pin of the FLT INH circuit or to the ground pin of the relay RLY circuit under test Using an Agilent 3478A the polarity of the ohmmeter is as shown on the front panel of the meter current flows from the
12. ommand has been changed to permit programming the supply with Option 750 OUT gt ch gt lt on off gt Programs both the output and RLY control for the specified output channel ch For on off 1 the RLY control is first closed and then the output is turned on after a 20ms delay For on off 0 the output is turned off and the RLY control is opened after a 20ms delay Having the output off when the RLY control changes state extends the life of the external relay Note This change to the OUT command also applies to the operation of the front panel OUTPUT ON OFF function key Operating Examples The FLT INH RLY circuits can be used in a variety of applications as shown by the following examples INH Example As shown in Figure 4 an external normally open switch S1 is connected to the INH input This switch could be attached to a hinged protection hood which covers the power supply output terminals When the hood is lifted and the switch closes the following action is taken by the supply 1 The power supply outputs turn off and the RLY controls open The INH bit in the status and accumulated status registers is set true 3 If the INH bit in the mask register has been unmasked the INH bit in the fault register as well as the FAU bit in the serial poll register will also be set true In this example the computer would be made aware that a fault exists during a serial poll via the FAU bit in the serial poll register Merely clo
13. put voltage lt 17 5V Vor Low level output voltage lt 0 5V Ion High level output current gt 10uA Io Low level output current gt 1 25mA Isolation lt 42V from either terminal to ground INH Input Vin High level input voltage 2 1 to 5 25V V u Low level input voltage 0 to 0 7V Im High level input current lt 20uA 7 Iu Low level input current gt 1 25mA 0 4V twPulse Width Delay time 20 mS typ RLY Controls Von High level input voltage lt 36V Vor Low level input voltage lt 2V 120mA Vor Low level input voltage lt 0 5V 2mA Ion High level input current gt 100uA Io Low level input current gt 120mA CAUTION Do not connect capacitive loads greater than 0 01uF maximum to the RLY controls FLT Indicator The fault indicator FLT is a low true TTL compatible open collector output which indicates if any internal fault register bits have been set This provides a fault reporting capability that is independent of the GPIB SRQ function In other words you dont have to rely on your computer to inform you of a fault in the supply You can connect the fault indicator to the inhibit input to provide a back up method of protecting a load The FLT signal is accessed through connector J702 on the rear of the supply See Figure 1 The FLT terminals are isolated from the chassis by an optoisolator and may be floated 42Vdc The FLT signal goes true when any unmasked bit in any of the fault reg
14. rity of the internal voltage is reversed current flows from the jack to the jack so the jack of the ohmmeter must be connected to the pin of the FLT INH circuit or to the ground pin of the relay RLY circuit under test Using an Agilent 3478A the polarity of the ohmmeter is as shown on the front panel of the meter current flows from the jack to the jack Depending on range and model number low is generally less than 2K ohms and high is an open overload Remote Inhibit INH Circuit Testing Turn on the 662x supply Momentarily short pins 3 and 4 of J702 The front panel annunciator should indicate RMT INHIBIT Turn off the 662x supply This concludes testing of the INH circuit gp Relay RLY Circuits Testing Using Method 1 a Connect the LED resistor and external 5Vpower supply to one set of relay output RLY pins on J703 Refer to Table 2 and Figure 6b and turn on the 662x power supply Send RELAY lt ch gt 0 to turn off the relay output under test The LED should be off Send RELAY lt ch gt 1 to turn on the relay output ch under test The LED should be on Repeat steps a through e for each relay output lt ch gt moaos EXTERNAL POWER SUPPLY Figure 6b RLY Test Setup Table 2 Relay Output Pins Relay output J703 pins lt ch gt 1 1 2 2 3 4 3 5 6 4 7 8 10 Using Method 2 a moaos Connect the ohmmeter leads between one set
15. sing the hood does not re enable the supply To re enable the supply first read the fault register to reset the FLT line and INH bit Then either send RIRST to restore the output of the supply to the programmed values that were in effect before the supply was disabled or send CLR to initialize the supply to its power on state See Table 5 3 in Operating Manual Note that the on off state of the outputs and RLY controls is determined by the DCPON command POWER SUPPLY OUTPUT 1 4 HA DUT S1 NORMALLY O ee OPEN Figure 4 INH Example FLT INH RLY Example with Multiple Supplies The setup in Figure 5 chains the FLT output of one supply to the INH input of the next supply A fault condition in any of the supplies causes all of the supplies to be disabled without computer involvement or external circuitry With four external relays connected to the RLY controls the fault opens all externally connected relays in addition to disabling the outputs The computer can be made aware of a fault via a service request SRQ Sending FAULT and then RIRST restores the output of the supplies to their programmed values before the FLT circuit was tripped Sending CLR initializes the supplies to their power on state See Table 5 3 in Operating Manual Note that the on off state of the outputs and RLY controls is determined by the DCPON command POWER SUPPLY C UP TO FOUR RELAYS E F
16. to the FLT INH and RLY circuits are made through screw terminals on the removable 4 and 8 position barrier blocks These barrier blocks plug into the J702 and J703 connector sockets located on the rear of the power supply Loosen the screws on top of the terminal block Strip your wires back approximately 0 2in Smm Insert wires fully into the screw terminals to prevent shorted connections The screw terminals can accommodate wire sizes from AWG 14 to AWG 28 Metric 1 5 0 5mm Refer to the label above the terminal block to make sure that you are inserting your wires into the correct opening Tighten the screws onto the wires Note To prevent RFI interference use shielded or twisted pair wiring for FLT and INH connections To prevent ground loops when shielded wire is used connect only one end of the shield to chassis ground INH low and RLY control low are connected to ground FROM 662X ONER P SUPPLY 9 OUTPUT 1 TO LOAD V 5V V UP TO 36V 1003 GOO RLYI L RLY2 L RLY L RLY2 L RELAY CIRCUIT LOGIC CIRCUIT Figure 3 Relay and Logic Circuits Connections Additional and Changed Commands The following power supply programming commands and queries have been added to the standard commands See Tables 5 1 and 5 2 of Operating Manual to permit programming the supply with Option 750 RELAY lt ch gt lt on off gt Opens on off 0 or closes on off 1 the RLY control for the specified output channe
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