User Manual of Precision AC- DC Power Supply
Contents
1. output terminal Negative polarity output terminal for the SLAVE supply 23 output terminal positive polarity output terminal for 5V supply 24 output terminal Negative polarity output terminal for 5V supply 29 Output ON OFF switch DC power supply output when switch is engaged in And when output is off both the voltage and current can be adjusted before the output is resumed 28 Output indicator lights when switch is engaged in 3 2 Rear Panel 25 Fuse holder 26 Power cord 27 Fan 30 AC voltage select switch 4 OPERATION INSTRUCTIONS 4 1 Precaution 1 AC input AC input should be within the range of line voltage 10 50 60Hz 2 Installation Avoid using the supply in a place where the ambient temperature exceeds 40 C The heat sink located at the rear of the supply must have sufficient air space for radiation Fig 3 2 Rear Panel O LEA xy AA y2. the unit is in the INDEPENDENT mode and the MASTER and SLAVE power supplies are completely independent from one another b When the left switch is engaged in and the right switch is disengaged out the unit is in the TRACKING SERIES mode In this mode maximum voltage of both supplies is set using the MASTER VOLTAGE controls voltage at output terminals of the SLAVE supply tracks the voltage at the output terminals of the MASTER supply Also in this mode of operation the positive terminal red of the SLAVE supply is connected to the negative terminal black of the MASTER supply This allows the two supplies to be used as one 0 to double rating voltage supply c When both switches are engaged in the unit is in the TRACKING PARALLEL mode In this mode the MASTER and SLAVE supplies are wired together in parallel and both the maximum current and voltage are set using the MASTER controls The MASTER and SLAVE outputs can be used as two individual but tracking power supplies or just the MASTER output can be used as a 0 to rating voltage supply with a 0 to double rating current capability 16 output terminal positive polarity output terminal for the MASTER supply 19 output terminal positive polarity output terminal for the SLAVE supply 17 GND terminal Earth and chassis ground 20 GND terminal Earth and chassis ground 18 output terminal Negative polarity output terminal for the MASTER supply 21
3. connected to the negative black terminal of the MASTER supply In the series tracking mode the maximum output voltage of both MASTER and SLAVE supplies can be simultaneously varied with one control The maximum SLAVE supply voltage is automatically set to the same value as the MASTER supply by using the MASTER VOLTAGE controls A Set the power supplies to the TRACKING SERIES mode by engaging the left TRACKING switch and release the right TRACKING switch In this case the output voltage across the two supplies is actually double the displayed value For example if the MASTER display is set for voltage metering and the SLAVE display for current metering the output voltage across the MASTER positive red terminal and the SLAVE negative black terminal would be double the reading on the MASTER LED Display since both supplies are putting out the same voltage The actual output current would be the value read from the SLAVE LED Display since the two supplies are wired in series current flowing through each supply must be equal B Set the SLAVE CURRENT control the fully clockwise position The maximum current is set using the MASTER CURRENT control Follow the instructions for Setting Current Limit INDEPENDENT USE OF MASTER OR SLAVE SUPPLY section of this manual using the MASTER CURRENT control NOTE Because the supplies are being used in series either CURRENT control can be used to set maximum current If desired the MASTE
4. relationship between this crossover point and the load For example if the load is such that the power supply is operating in the constant voltage mode a regulated output voltage is provided The output voltage remains constant as the load increases up until the point where the preset current limit is reached At that point the output current becomes constant and the output voltage drops in proportion to further increases in load The point is indicated by the front panel LED indicators The crossover point is reached when the CV indicator goes off and the CC indicator comes on Similarly crossover from the constant current to the constant voltage mode automatically occurs from a decrease in load A good example of this would be seen when charging a 12 volt battery Initially the open circuit voltage of the power supply may be preset for 13 8 volts A low battery will place a heavy load on the supply and it will operate in the constant current mode which may be adjusted for a 1 amp charging rate As the battery becomes charged and its voltage approaches 13 8 volts its load decreases to the point where it no longer demands the full 1 amp charging rate This is the crossover point where the power supply goes into the constant voltage mode 3 1 Front Panel 22 Power switch ON OFF the power input O V LED display Indicates the MASTER output voltage O V LED display Indicates the SLAVE output voltage ALED display Indicates the MASTER outp
5. supplies are strapped together in parallel This allows for a rating voltage supply with a double rating current capability Only the MASTER output terminals are used for parallel tracking operation In the parallel tracking mode the SLAVE supply output voltage and current are tracking the MASTER supply output voltage and current A Set the power supplies to the TRACKING PARALLEL mode by engaging both TRACKING switches B Because both voltage and current of the SLAVE supply track the MASTER supply the maximum current and voltage are set using the MASTER controls Using the MASTER supply output jacks follow the instructions for Setting Current Limit 4 2 Section Remember that the actual current output at the MATER supply output jack is double the reading on the SLAVE indicator meter Then push the output on off key to enter voltage and current setting C Adjust the output voltage to the desired level using the MASTER VOLTAGE controls D Turn off the power supply and the equipment to be powered during hook up E Connect the positive polarity of the device being powered to the red terminal of the MASTER power supply F Connect the negative polarity of the device being powered to the black terminal of the MASTER power supply The configuration as shown in Fig 4 5 MASTER LOAD SLAVE LOAD POWER SUPPLY Fig 4 5 Parallel Tracking Operation MASTER LOAD SLAVE POWER SUPPLY Fig 4 3 Single S
6. 0 19 151418 17 16 24 23 10 11 Constant Current Range Crosso ver Point Voltage Range Constant Out put Current Fig 4 1 Con stant Voltage Co nstant Characteristic 3 Output voltage overshoot Maybe voltage between output terminals exceeds the present value when the power is turned on or off 4 2 Setting Current Limit 1 Determine the maximum safe current for the device to be powered 2 In general the and terminals of the power supply should be temporarily short together with a test lead But in this instrument Only model C D just pushing the output on off key can make the short circuit function 3 Rotate the VOLTAGE control away from zero sufficiently for the CC indicator to light 4 Adjust the CURRENT control for the desired current limit Read the current value on the A meter 5 The current limit overload protection has now been preset Do not change the CURRENT control setting after this step 6 Remove the short between and terminals and hook up for constant voltage operation 4 3 Constant Voltage Constant Current Characteristic The working characteristic of this series Power Supplies is called a constant voltage constant current automatic crossover type This permits continuous transition from constant current to constant voltage modes in response to the load change The intersection of constant voltage and constant current modes is called the crossover point Fig 4 1 shows the
7. Approx 8kg 2 2 Operation Mode 1 Independent Two independent outputs and 5V fixed output Output from 0 to rating volts and 0 to rating amperes 2 Series Output from 0 to rating volts at rating amperes each Output from 0 to double rating volts at rating amperes 3 Parallel Output from 0 to double rating amperes at rating volts 2 3 Constant Voltage Operation 1 Output current range 2 Regulation 3 Recovery time 4 Ripple amp Noise 5 Temperature coefficient 2 4 Constant Current Operation 1 Output current range 2 Regulation 3 Ripple current 2 5 Tracking Operation 1 Parallel operation Regulation Line 2 Series operation Regulation 2 Series Tracking Operation 0 rating voltage continuously adjustable Line regulations 0 01 3mV Load regulations 0 01 3mV rating currents 3A Load regulation lt 0 02 5mV rating current gt 3A 100us 50 Load change Minimum load 0 5A lt 1mV rms 5Hz 1MHz 300PPM C 0 rating current continuously adjustable Line regulations 0 2 3mA Load regulations 0 2 3mA 3mA rms regulation x 0 01 3mV Load regulation lt 0 01 3mV rating currents 3A 0 02 5mV rating current gt 3A Line regulation lt 0 01 5mV Load regulation lt 300mV A Positive and Negative supply Fig 4 4 When the series tracking mode of operation is selected the positive red terminal of the SLAVE supply output is internally
8. R CURRENT control can be rotated fully clockwise and the SLAVE CURRENT control can be used to adjust the maximum current value Because current through the two supplies must be equal when they are being used in series the lower CURRENT control setting will set the maximum output current C Adjust the output voltage the desired level using the MASTER VOLTAGE controls D Turn off the power supply and the equipment to be powered during hook up E If single supply operation is desired this allows the power supply to be used as twice the voltage and rating current simply by using the negative black terminal of the SLAVE supply and the positive red terminal of the MASTER supply the configuration as shown in Fig 4 3 4 4 Operation Mode 1 Independent Operation The MASTER and SLAVE supplies each provide a 0 to rating volts output at up to rating amps This procedure covers the use of the MASTER and SLAVE supplies only when they are used independently from one another When used in the INDEPENDENT operating mode the operating controls of the two power supplies are completely independent and either supply can be used individually or both can be used simultaneously A Disengage both TRACKING mode switches both switches out so that the power supply is in the INDEPENDENT operating mode B Adjust Voltage control and Current control to the desired output voltage and current C Turn off the power supply and the equipment to be powere
9. User Manual of Precision AC DC Power Supply Dual Channel 0 30V 5A max or 0 60V single channel AA Portable Power Corp AA Portable Power Corp http www batteryspace com Address 860 S 19 St Unit A Richmond CA 94804 Tel 510 525 2328 Fax 510 439 2808 Email Sales batteryspace com Prepared amp Approved by Max 20 10 10 1 INTRODUCTION Adjustable DC power supply are designed to be used in applications such as powering operational amplifier push pull stages logic circuit and definition systems where plus and minus voltages are required to track with an insignificant error and in any application where three independent power supplies housed in a single package represent an operating convenience The instruments consist of two identical independently adjustable and one fixed 5V 3A DC power supplies A front panel switch selects one of three modes of operation independent series and parallel In the independent mode the output voltage and current of each supply are controlled separately and each supply is isolated up to 300V from output to chassis or output to output In the tracking mode both outputs are automatically connected in series or parallel and the controls of the left supply adjust the magnitudes of both the positive and negative output voltages Because the outputs are connected in a tracking configuration any internal disturbance in the master supply such as drift or ripple will cause an equal percentag
10. d during hook up D Connect the positive polarity of the device being powered to the red terminal of the power supply E Connect the negative polarity of the device being powered to the black terminal of the power supply F Fig 4 2 illustrates the connection procedure MASTER LOAD SLAVE LOAD POWER SUPPLY Fig 4 2 Indep endent Operation Slave tracking error x 0 5 10mV of the master No load with load add Load regulations 300mV B Single supply Fig 4 3 2 6 Meter A Display 3 Digits panel meter H3 0 4 Red LED display H2 0 4 Green LED display H2 B Accuracy 0 5 of rdg 2 digits NOTE Model C Model D Out OFF Accuracy 0 5 of rdg 8 digits C Voltmeter 99 9V of full scale D Ammeter 9 99A of full scale 2 7 5V Output Specifications 1 Regulation Line regulations 10mV Load regulations 15mV 2 Ripple amp Noise 2mV rms 5Hz 1MHz 3 Voltage accuracy 5V 0 25V 4 Output current 3A 2 8 Insulation Between chassis and output terminal 20MW or above DC 500V Bj o N N o Between chassis and AC cord 300MW or above DC 500V 3 PANEL CONTROLS AND INDICATORS Fig 3 1 Front Panel f A V A V 300 300 300 300 CURRENT i VOLTAGE Wes VOLTAGE P oN y SERIES g Er J ccce 1 m PARLE CC Cv T ya S e ON FF SLAVE TRACKING nM MT MASTER mum POWER y GD GND OH OOO O O OO FIXED 3A 22 12 21 2
11. e change in the outputs of both the supplies Each power supply is a completely transistorized well regulated constant voltage constant current supply that will furnish full rated output voltage at the maximum output current or can be continuously adjusted throughout the output range The front panel current controls can be used to establish the output current limit overload or shout circuit when the supply is used as a constant voltage source independent or tracking modes and the voltage controls can be used to establish the voltage limit ceiling when the supply is used as a constant current source independent mode only The supply will automatically cross over from constant voltage to constant current operation current limited operation in the tracking mode and vice versa if the output current or voltage exceeds these preset limits Each supply had its own front panel meter that can measure output voltage and current One power supply may be used as a master supply controlling one slave supplies furnishing various voltages or current for a system When operated with the front panel mode switch in the tracking position the instrument is automatically internally connected in auto tracking configuration Another feature of this instrument is its output ON OFF key a For model A B it is only the key to cut off or resume the output as other similar instrument 3 Parallel Tracking Operation In the parallel tracking mode of operation both
12. upply If the chassis or common of the equipment being powered is separate from both positive and negative polarity power inputs The output of the SLAVE negative supply is tracking the output of the MASTER positive supply The configuration is shown in MASTER GND LOAD SLAVE POWER SUPPLY Fig 4 4 Positive and Negative Suppl y b For model C D it is not only the key to cut off or resume the output but also be endowed with a new function which its Kindred has not This function is that when the output has been cut off the both intending voltage and current can be preset though in model A B condition only the intending voltage can be adjusted It means that CC preset is very easy as CV preset Also in this way an over current by any unknown load can be avoided So the new function of the key is a safety design Especially this feature is very important to the student use 2 SPECIFICATIONS 2 1 General Power Source AC 110V 220V 10 50 60 Hz Operation Temperature amp Humidity 0 C to 40 C lt 80 Storage Temperature amp Humidity 10 C to 70 C lt 70 Accessories Operation Manual s s e se me mmm m ee A Rating Model A B C D Specificatio Output voltage 2H 0 30V 2H 0 30V 2H 0 30V 2H 0 30V Output current 2H 0 3A 2H 0 5A 2H 0 3A 2H 0 5A Output fixed 5V 3A 5V 3A 5V 3A 5V 3A Output on off X X Vv Vv V A initializes Dimensions 245 W H140 H H345 D mm Weight
13. ut current ALED display Indicates the SLAVE output current Voltage control for adjustment of the output voltage of the MASTER supply Also functions as adjustment control for the maximum output voltage of the SLAVE supply when either parallel or series tracking operation Voltage control for adjustment of the output voltage of the SLAVE supply when the independent operation Current control for adjustment of the output current of the MASTER supply Also functions as adjustment control for the maximum output voltage of the SLAVE supply when either parallel or series tracking operation Current control for adjustment of the output current of the SLAVE supply C V indicator lights when the MASTER supply is in the constant voltage operation in either the Series or Parallel Tracking mode both the MASTER AND SLAVE supplies are in the constant voltage operation 12 C V indicator lights when the SLAVE supply is in the constant voltage operation 11 C C indicator lights when the MASTER supply is in the constant current operation 13 C C indicator lights when the SLAVE supply is in the constant current operation Also lights when the TRACKING PARALLEL mode is selected Over load indicator lights when load on 5 volt supply becomes too large 14 15 TRACKING Mode Switches Two push button switches that select INDEPENDENT mode series tracking mode or parallel tracking mode as follows a When both switches are disengaged out
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