DC POWER SUPPLY GPS-S SERIES ( DOUBLE DIGITAL ) 82PS-303DDMCSAFETY TERMS AND SYMBOLS These terms may appear in this manual or on the product: /\ WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property. The following symbols may appear in this manual or on the product: A A A v DANGER DANGER ATTENTION Protective Equipotentiality High Voltage Hot Surface refer to Manual Gonductor erminalEC Declaration of Conformity We GOOD WILL INSTRUMENT CoO., LTD. No.7-1, Jhongsing Rd, Tucheng City, Taipei County 236, Taiwan GOOD WILL INSTRUMENT (SUZHOU) CO., LTD. No.69 Lushan Road, Suzhou New District Jiangsu, China. GPS-3030DD, GPS-1830DD are herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (89/336/EEC, 92/3 1/EEC, 93/68/EEC) and Low Voltage Equipment Directive (73/23/EEC). For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Equipment Directive, the following standards were applied: EN 61326-1:Blectrical equipment for measurement, control and laboratory useEMC. > gequirements =. (1997+A1: 1998) Conducted Emission ~~ JEN 55022 class B (1994) ~ ]] Electrostatic Discharge [IEC 1000-42 (1995) Radiated Emission EN 55011 classB (1991) Radiated Immunity IEC 10004-3 (1995) Current Harmonics EN 61000-3-2 (1995) Electrical Fast Transients |IEC 1000-4-4 (1995) Voltage Fluctuations EN 61000-3-3 | (1995) Surge Immunity IEC 1000-4-5 (1995) ween eee nee a ee --------- Conducted Susceptibility {EN 61000-4-6 (1996) eeewecereeweenenne | cece weceencees Power Frequency Magnetic field |EN 61000-4-8 (1993) a a wecnennene arecenee= Voltage Dip/Interruption _ {EN 61000-4-11 (1994) Low Voltage Equipment D Directive 73/23/EEC : Low Voltage Directive EN 61010-1:(1993)+A2:(1995)FOR UNITED KINGDOM ONLY NOTE This lead/appliance must only be wired by competent persons WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT The wires in this lead are coloured in accordance with the following code: Green/ Yellow: Earth Blue: Neutral Brown: Live(Phase) As the colours of the wires in main leads may not correspond with the colours marking identified in your plug/appliance, proceed as follows: The wire which is coloured Green & Yellow must be connected to the Earth termina! marked with the letter E or by the earth symbol or coloured Green or Green & Yellow. The wire which is coloured Biue must be connected to the terminal which is marked with the letter N or coloured Blue or Black. The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red. if in doubt, consult the instructions provided with the equipment or contact the supplier. This cable/appliance should be protected by a suitably rated and approved HBC mains fuse : refer to the rating information on the equipment and/or user instructions for details. As a guide, cable of 0.75mm 2 should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used. Any moulded mains connector that requires removal/reptacement must be destroyed by removal of any fuse & fuse carrier and disposed of immediately, as a plug with bared wires is hazardous if engaged in a live socket. Any re-wiring must be carried out in accordance with the information detailed on this label.CONTENTS SECTION PAGE 1. INTRODUCTION SPECIFICATIONS 2-1 General 2-2. Constant Voltage Operation 2-3. Constant Current Operation 2-4 Indicator Meter 2-5 Insulation WOWWND cneeeeveseseadsearenccnnanaeasnensonussensengusnnasenesnnsseuadenenenssaacesessseseuadeeasosussceeaeersacsansnseseneasancneesseedeceocasansussousasaacoasenensnssseceaeecessesageneaersess 4 THEORY OF OPERATION.................:::sccsssccsssssscsnscesssesessenscsenseeseareseees paseeese 4 PANEL CONTROLS AND INDICATORS ............ 6 4-1 Front Panell.....ccccsscsssssscesssssesssessssescssssssssevsscsessssessseassssesseseseseessesecsesescsnsseecesseasecssentoesesssesssonegesesassuaescnsevscsneauseasausvaseuisestaeseseavacensaeans 6 4-2 Rear Panel .......sccssssscsseccscssssscscsscssssesscssscssesssescssaeseseseuesssenenssesseeasecesnesseasnesessececessseneasscacessendsoussavecauassesansseceeauedaaaseeseuscarsuatsesuseaecseas 6 OPERATION INSTRUCTIONG. .................:ccccccscssessessssensseeserssens 5-1 PreCAUtiOn........csscssscssscseneeseecsesesenessessesssnseesenenacasseaesescssseneseseesesnesscasesaseeseaneersansenanavesseaness 5-2 Setting Current Limit... ssessssseseeseeesseetseenseeeeneee 5-3 Constant Voltage/Constant Current Characteristic a wees sees a wuss 5-4 Operation Mode ........cscsssssscssscsssesscsssssescsessensssssssaessssensatsconsesssestsessacseesseasansesessseresssanenseassersesssceassoneesoenseeseosseneas . MAINTANCE ............::ccccceeeseeee 6-1 Fuse Replacement 6-2 Line Voltage Conversion sen wee , 6-3 ACJUSTMENTS....... ee eeeececestesseeesssessonenseesessessnersesesuetsssseeesseasenserseessnananereseuess desaeseneassesssesanseaeeceneesesessuensessecarsessonssanesssasseteensnesanesenes 6-4 Cleaning1. INTRODUCTION The regulated DC power supply have been designed to provide the most often required in the laboratory, schools and production lines. The output voltage is continuously adjustable between 0 to rating voltage in one range by means of a coarse and fine potentiometer, the load current may have any value from 0 to rating current and adjusted by means of a coarse and fine potentiometer. Both outputs can accurately read on voltmeter and ammeter. Both stability and ripple are extremely good to meet the requirements of modern circuit design. The unit can be used as either constant voltage or current source. The various operation mode are described in more detail in the Operation Instruction section. For applications when output greater than V or A is need, the unit can be connected up in series or parallel. For applications in audio production lines, the continuous or dynamic load internal selectable.( 2. SPECIFICATIONS 2-1 General Main supply Rating, dimension and weight 100V/120V/220V/240V +10% 50/60 Hz (Switch selectable) see Table 2-1. Table 2-1 . Max. Rating Dimensions Weight MODEL Display Type Volts (V) Amps (A) WxHxD (m/m) Kg GPS-1830DD Double Digital 18 3 4.0 45(H) 285 GPS-3030DD Double Digital 30 3 128(W) 145(H) {0} 5.0 Dimensions : 128(W) x 145 (H) x 285 (D) mm WARNING. Voltages more than 60V DC are a lethal shock hazard to the user. Be careful when connecting power supplies in series to achieve voltages higher than 60V DC total or 60V DC between any connection and earth ground. Operation mode Operation Environment : Indoor use Single or Tracking (Series or Parallel) operation (two units). Altitude up to 2000 m Installation Category Il Pollution degree 2Operation Temperature & 0C to 40C, <80% Humidity Storage Temperature & 10C to 70C, <70% Humidity Accessories Test lead (Current <4 A) oo. sceeccscetssuessessesenssessessscesenesnenserensassesseneesnssecaenentensntens 1 (4A<current<10A) Operation Manual ..........sssssssssssessescsseseessestssssssessvessserasseneenessassensentenssenieeneensenessnes 1 2-2 Constant Voltage Operation (1) Output voltage ranges 0 to rating voltage continuously adjustable. (2) Voltage regulation line regulation<0.01%+3mV. load regulation<0.01%+3mvV (rating current<3A). load regulation<0.01%+5mvV (rating current>3A). (3) Recovery time<100us (50% Load change, minimum load 0.5A) (4) Ripple & Noise <0.5mVrms (5Hz~1MHz) (rating current<3A). Ripple & Noise <1.0mVrms (5Hz~1MH2z) (rating current>3A). (5) Temperature coefficient<300PPM/C. 2-3 Constant Current Operation (1) Output current range 0 to rating current continuously adjustable. (2) Current regulation line regulations0.2%+3mA. load regulation<0.2%+3mA. (3) Ripple & Noise<3mArms. 2-4 Indicator Meter Display : 3 1/2 Digits 0.39" Red LED and Green LED DISPLAY. Accuracy: +(0.5% of rdg + 2 digits). -3-( Voltage range: 19.99V of full scale (rating voltage<18V). 199.9V of full scale (rating voltage=20V). Current range: _1.999A of full scale (rating current<2A). 19.99A of full scale (rating current=2A). 2-5 Insulation Between chassis and output terminal. 20MQ. or above (DC500V). Between chassis and AC cord. 30MO or above (DC500V). 3. THEORY OF OPERATION The power supply consists of an AC input circuit and transformer, a bias supply consisting of a rectifier and filter and reference voltage source, a main regulator circuit consisting of the main rectifier and filter, a series regulator, a current comparator, a voltage comparator, a reference voltage amplifier, a remote control and a relay control circuit. The circuit element are several of integrated circuit (U101, U102, U103, U104, U105, U106). The circuit arrangement is shown in block diagram from Fig. 1. - The circuit is discussed with reference to the block diagram Function Description. Single phase input power is applied to transformer through the input circuit. Auxiliary rectifier D1021-D1024 provides a bias voltage filtered by capacitor C103, C104 for the preregulator U101, 0108, Q106, that provides a regulator voltage for element of action. The main rectifier, a full wave bridge rectifier, provides the power which is filtered by capacitor C101 and then regulated via a series regulator and deliver to the output. U105 acted as a current limiter. When current is over predominante rating, it acted and decreased the current U102 provides a reference voltage for U103A, U103B, U103 is a invertor amplifier, U105 is a current comparator. Both via OR gate and driver amplifier to series control 0101, Q102. The relay control circuit provides limited power dissipation is series regulator. -4-AC INPUT U RELAY CONTROL Q109,Q110,Q111 Q112,Q113 RL101,RL102 REFERENCE AUXILIARY VOLTAGE RECTIFIER AND TRANSFORMER | FILTER 01021 SOURCE 01024 ,U101 TS101 U102 Q105,Q106 M AIN REMOTE CONTROL REFERENCE OR'GATE & REINER T101,S105 | CURRENT DRIVER AMP FILTER D101 #& COMPARATOR 0108,D109 -D1014,C101 , SER| O- N U103B Q103,Q104 R101 MASTER! 0/P PAR v A || SER SER} Oh ) @ CURRENT SERIES SLAVE! 1/P A COMPARATOR REGULATOR U105 Q101,0102 PAR , CURRENT REFERENCE VOLTAGE L______ AMPuFIER || COMPARATOR |) SEI U103A U104 U106 7% 7} 0/P > A Fig. 1 Block Diagram -5-4. PANEL CONTROLS AND INDICATORS 4-1. Front panel GOQS QEO@OEGOOSQCOO CV indicator CC indicator Voltage coarse Voltage fine Current coarse Current fine "+" output terminal "GND" terminal " output terminal meter meter AN selects switch Power control Current HI/LO control 4-2 Rear panel Geo SQ Fuse holder Power cord AC selects switch AC selects switch Master-Slave Switch Input-Output connector lights when the power turn on and constant voltage operation. lights when this unit in constant current operation. for the coarse adjustment of the output voltage. for the fine adjustment of the output voltage. for the coarse adjustment of the output current. for the fine adjustment of the output current. positive polarity (Red). earth and chassis ground (Green). negative polarity (Black). indicates the output voltage. Indicates the output current. selects the meter indicates of the output voltage or current (Digital type). on/off switch. current indicates HV/LO range SELECTS. With switch selects the line voltage at the high end (Right position) of the range 120V or 240V and at the low end (left position) of the range 100V or 220V. Selects the line Voltage is in the 100V-120V range (left position) or is in the 220V-240V range (Right position). Selects for Master (internal control) or Slave (external remote control) tracking operation. With Master-Slave switch selects, permit from the Master unit (SER. or PAR.) output connected to Slave unit (SER. or PAR.) inputs. -6-@ @ (ff GWINSTEK crss03000 pc power Supply If 28 Foo ait He) Hot 1 VOLTAGE 51) 6.8 HC CHC CY. FINE COARSE AMPS] FINE COARSE mON MOFF /i- CNO |er9 Lo sy L 5666 Fig. 4-1 Front Panel ~7-a @MME PROGRAMMING Ei) DEPRESS TAB TO INSERT OR REMOVE WIRE x) OOOO! |= SER PAR(SERTIPAR] ypyt ov PROGRAMS MASTER SLAVE ouTPUT INPUT FULL RANGE REFER TO MARUAL MASTER FOR SETUP SLAVE @MAc LINE SELECT ily o [J |. @ 2 100V | =~ 220v a@ 120V | a 240V e 1@ UNE | FUSE | FREQ | POWER 1OOV 1 72.5A 160W 120V | 250V | 50Hz 200VA 220v [11.25A] 60Hz | ay 240 | 250v y) AC QO (} 0 0 = FIG. 4-3 REAR PANEL -R- @ 5. OPERATION INSTRUCTIONS 5-1 Precaution (1) AC input AC input should be within the range of line voltage+10% 50/60Hz /\ WARNING. To avoid electrical shock, the power cord protective grounding conductor must be connected to ground. (2) Installation Avoid using the supply in a place where ambient temperature exceeds 40C. The heat sink located at rear of the supply must have sufficient air space for radiation. /\ CAUTION. To avoid damaging the power supply, don't use it in a place where ambient temperature exceeds 40C. (3) Output voltage overshoot Voltage between output terminals never exceeds the present value when the power is turned on or off. 5-2 Setting Current Limit (1) Determine the maximum safe current for the device to be powered. (2) Temporarily short the (+) and () terminals of the power supply together with a test lead. (3) Rotate the COARSE 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 Ammeter. (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 the (+) and () terminals and hook up for constant voltage operation. 5-3 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. 5-1 shows the 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 is proportion to further increases in load. The crossover 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. -g-Vo Max = Constant Current lo Max ~ Range |} _ >_<] >_<] & +Crossover Point Constant Voltage Output ange Voltage Output Current Fig. 5-1 Constant Voltage/Constant Current Characteristic. Similarly, crossover from the constant current to the constant voltage mode automatically occurs from a decrease in load. ; | Agood example of this would be seen when charging a 12-volt battery. Initially, the open circuit voltage of the power supply may wi 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. -10-5-4.Operation mode (1) Single Operation Use the supply as it is for single operation. A. Set Power switch to OFF position. B. Make sure that line voltage is correct for the input power voltage. C. Plug power cord into the power outlet. D. Set Power switch to ON position. E. Adjust Voltage and Current control to the desired output voltage and current. F. Connect the external load to the output binding posts. Make sure both + and terminals are connected correctly. (2) Series Operation(only applied to the same models) Two power supplies can be connected in series to provide higher voltage and rating current output. See Fig. 5-2 for the connection scheme. A. Set power switch to OFF position. B. Set the MASTER power supply INT-SLAVE switch to INT position and set the SLAVE power supply INT-SLAVE switch to SER-SLAVE position. C. Connect the MASTER power supply SER output terminal to SLAVE power supply SER input. D. Connect Master to Slave +. E. Connect Load to Master + and Slave F. Set power switch to ON position. ce 8 when connecting power supplies in series to achieve voltage higher than 60V DC | WARNING: Voltage more than 60V are a lethal shock hazard to the user. Be careful total or 60V DC between any connection and earth ground. -ll-( REAR PANEL SER. 1/P_ + o O POWER 1; / SUPPLY i , (MASTER) INT SLAVE LOAD CONNECTED 1/P | 1 || OOOO POWER - | SER. SUPPLY | (SLAVE) | INT SLAVE | Fig.5-2 Connecting two Power supplies in Series -)2-(3) e E. Set the SLAVE VOLTAGE and CURRENT control to maximum output. @ F. When connected in series, from the master VOLTAGE controls of each power supply exercise control over 0 to rating range. Add the two voltmeter readings together to determine the total output voltage, or an external voltmeter may be connect across the load. G. Load current may be monitored from either supply; the reading will be identical since they are connected in series. Also, since the supplies are connected in series, it is only necessary to set the current limit of the master power supply; the slave would set for maximum. Parallel Operation Two power supplies may be connected in parallel to provide rating voltage and higher current output. See Fig. 5-3 for the connection scheme. A. Set power switch to OFF position. B. Set the "Master power supply INT-SLAVE switch to "INT" position and set the SLAVE power supply INT-SLAVE switch to "PAR-SLAVE position. C. From the MASTER power supply PAR output terminal connected to SLAVE power supply "PAR" input. D. When connected in parallel the VOLTAGE controls of each power supply exercise control over a 0 to rating range. Add the two ammeter readings together to determine the total output current or an external ammeter may be connected series the load. The output voltage may be monitored from either supply; the readings will be identical since they are connected in parallel. Also, since the supplies are connected in parallel, it is only necessary to set the current limit of the master power supply; the slave would set for maximum. Set power switch to ON position. @ Set the SLAVE VOLTAGE and CURRENT control to maximum output. Set the MASTER output voltage lower than 0.2-0.5V of SLAVE output voltage, this point is very important. m rom -1]3-REAR PANEL | PAR. '/P 0000 PoweR 4 to \o/pf SUPPLY =o6 yi | (MASTER) INT! SLAVE CONNECTED [ \/P a || OOOO aan Te | Tr. SUPPLY 6~ | tf (SLAVE) [INT SLAVE | Fig. 5-3 Connecting Two Power Supplies in Parallel. -14- LOADe (4) Remote control of output voltage follow, See Fig. 5-4. @ The output voltage of the power supply can be remote-controlled with an external voltage, the connection scheme as Fig. 5-4 REAR PANEL > REMOTE CONTROL VOLTAGE SOURCE [Tf li/P | O000 POWER [ + | /P/SER. SUPPLY _ lint SLAVE | Set the power supply INT-SLAVE switch to SER-SLAVE position. The "+ line of control voltage source is connected to the SER input terminal and the "" line of control voltage source is connected to the power supply output "+" terminal. The output voltage Eo calculate as follows formula: Eo = ErxEc 10 Eo: Output voltage of the power supply. Er: Rated voltage of the power supply. Ec: Remote control voltage. @ 0<Ec<approx. 10V For the remote voltage source Ec, use a divice which provides a stable, low noise voltage source (a GOOD WILL GPR, GPC series power supply or an equivalent device). e -15-(5) Remote control of output current The output current of the power supply can be remote-controlled with an external voltage, the connection scheme as follow, L See Fig.'5-5. Fig. 5-5 REAR PANEL ==>; REMOTE CONTROL VOLTAGE SOURCE [ 15 /P + | QOO000 POWER 1 o<7 | 7r7 PLR. SUPPLY | o<l lint] stave | A. Set the power supply INT-SLAVE switch to "PAR-SLAVE position. B. The" line of control voltage source is connected to the "PAR input terminal and the "+ line of control voltage source is connected to the power supply output "+" terminal. C. The output current lo calculate as follows formula: lo = thx Ec 10 i lo: Output current of the power supply. wy Ir: Rated current of the power supply. Ec: Remote control voltage. 0<Ec<approx. 10V D. For the remote control voltage source Ec, use a device which provides a stable, low noise voltage source (a GOOD WILL GPR, GPC series power supply or an equivalent device). -16-6. MAINTENANCE The following instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing other than contained in the operating instructions unless you are qualified to do so. 6-1 Fuse Replacement if the fuse blows, the CV or CC indicators will not light and the power supply will not operate. The fuse should not normally open unless a problem has developed in the unit. Try to determine and correct the cause of the blown fuse, then replace only with a fuse of the correct rating and type. The fuse is located on the rear panel {see Fig. 4-3). WARNING. For continued fire protection. Replace fuse only with 250V fuse of the specified type and rating. And disconnect the power cord before replacing fuse. 6-2 Line Voltage Conversion The primary winding of the power transformer is tapped to permit operation from 100, 120, 220, or 240 VAC, 50/60 Hz line voltage. Conversion from one line voltage to another is done by change AC selects switch as shown in Fig. 4-3. The rear panel identifies the line voltage to which the unit was factory setted. To convert to a different line voltage, perform the following procedure: (1) Make sure the power cord is unplugged. (2) Change the AC selects switch to the desired line voltage position. (3) Achange in line voltage may also require a corresponding change of fuse value. Install the correct fuse value as listed on rear panel. 6-3 Adjustments This unit was accurately adjusted at the factory before shipment. Readjustment is recommended only if repairs have been made in a circuit affecting adjustment accuracy, or if you have a reason to believe the unit is out of adjustment. However, adjustments should be attempted only if a multimeter with an accuracy of +0.1% dcv or better is available (GOOD WILL Model GDM-8035G or equivalent). -17- e eIf readjustment is required, use the following procedure. Locations of the adjustments are shown in Fig. 6-1 and Fig. 6-2. (1) Adjustment of the Rating Voltage Connect an accurate (+0.1%) external multimeter to measure the dc voltage at output terminals of the power supply. Set the COARSE and FINE VOLTAGE controls to minimum (fully counterclockwise). Adjust trimmer pot VR106 for a reading of 0 volts on the multimeter. Turn the COARSE and FINE VOLTAGE controls to maximum (fully clockwise). Adjust trimmer pot VR105 for a reading of rate voltsx1.05 on the mulitimeter. Set the COARSE and FINE VOLTAGE controls for a reading of rate volts on the multimeter. Adjust trimmer pot VR301 (VR201 digital type) for a reading of rate volts on the voltmeter (Digital Panel meter, digital type) of the power supply. djustment of the Rating Current Set the CURRENT control to minimum (fully counterclockwise). Connect the external multimeter to measure DC current at the output terminals of the power supply. Set the COARSE and FINE CURRENT controls to minimum (fully counterclockwise). Adjust trimmer pot VR107 for reading of 0 amps on the multimeter. Set the COARSE and FINE VOLTAGE controls to a centered position. Setting and turn the COARSE and FINE CURRENT controls to maximum (fully clockwise). . Adjust trimmer pot VR108 for a reading of 1/2rate ampsx1.05 on the multimeter. (LO current) . Adjust trimmer pot VR109 for a reading of rate ampsx1.05 on the multimeter. (HI current) Readjust the CURRENT control for a reading of rate amps on the multimeter. Adjust trimmer pot VR1 for a reading of rate current on the voltmeter of the power supply. Adjust trimmer pot VR110(LO), VR111(HI) to calibrate the Ammeter or Digital panel meter of the power supply for the same reading as the multimeter. . 6-4 Cleaning To cleaning the power supply, use a soft cloth dampend in a solution of mild detergent and water. Do not spray cleaner directly onto the instrument, since it may leak into the cabinet and cause damage. Do not use chemicals containing benzine, benzene, toluene, xylene, acetone, or similar solvents. Do not use abrasive cleaners on any portion of the power supply. -18- > (2) AO-TAMMONB>EP ANmMoIODGPS-846-1 ibs, QBs. Lo VR108 Cryst VR107 we GPS-846 -7 || Viiog || GPS-846 -2 GPS-846 -6 vR112 nas as LO HI i MAX, VR105 VOLTS. e Fig. 6-1 Adjustment Location -19-| A. AOI U. ADJ 1 a URI UR2 PS@4P01B | US Fig. 6-2 Adjustment Location -20-