DC POWER SUPPLY GPR-HIGH SERIES (ANALOG/DIGITAL TYPE) USER MANUAL GW INSTEK PART NO.82PR-30H10MD [>a ISO-9001 CERTIFIED MANUFACTURER GW INSTEKCONTENTS SECTION PAGE 1. INTRODUCTION 2.00 ee ee ee ee ee eee ee ee 1 2. SPECIFICATIONS .. 0.0.00... . cc ee ee eR een ee eee eee 2 2-1. General. 0. ee 2 2-2 Constant Voltage Operation .. 0... ees 3 2-3. Constant Current Operation .. 0.0... ee 3 2-4 indicator Meter... 00. ee 3 2-5 Insulation oe 4 3. THEORY OF OPERATION. (2.00000 ee ee ee 4 3-1 Low Voltage Circuit... 2... 6-2 -ee eeees Dn ee 4 3-2 High Voltage Circuit... 0. ne 5 4. PANEL CONTROLS AND INDICATORS... .......0 0.0. cet ee eee ee ee 8 4-1. Front Panel 2... ee 8 4-2 RearPanel. 0... 8 5. OPERATION INSTRUCTIONS. ......0.0.00 000 ce ee ee ee 12 5-1 Precaution. 2. ee 12 5-2 Setting Current Limit. ... eee 12 5-3 Constant Voltage/Constant Current Characteristic. ... ee ee eee 12 5-4 Operation Mode . 2... 13 6. MAINTANCE... 0.0.0... ce ee ee ee ee ee eee eee 15 6-1 Fuse Replacement... 0... eS 15 6-2 Line Voltage Conversion... 0... ee 15 6-3 Adjustments 2.0.0.2 ee 15PRECAUTION APPENDIX The Selection of Output Test Lead and Feedback Test Lead: For safety assurance, please select the adequate output test lead according to the following list: UL Conductor Maximum Permissible (CSA) Wire No. Component Cross Section Area Outer Conductive Resistor Current Model AWG pe/mm (mm) Diameter Q/an A(amp) mm 24 11/0.16 0.22 0.64 88.6 7.64 22 17/0.16 0.34 0.78 62.5 10.0 20 21/0.18 0.53 0.95 39.5 13.1 thw 18 34/0.18 0.87 121 24.4 17.2 (Twisted Wire) 16 26/0.254 1.32 1.53 15.6 22.6 14 41/0.254 2.08 2.03 9.90 30.4 12 65/0.254 3.29 2.35 6.24 40.6 10 65/0.32 5.23 3.00 3.90 $5.3 Remark: 1. The ambient temperature of Permissible Current is at 40C, the withstanding temperature of conductor is at 105C according to the condition of the distributed single wire. 2. The permissible current listed as above is suggested to be used under 70%. 3. Ifthe feedback test leads are in need, the level above UL(CSA) AWG24, 22, 20... can be accepted. Besides, when the load is a capacitive load, please use the twine wire by twisting (+)output test lead with (S+) feedback test lead. Same way used on (-) output test lead and (S-) feedback test lead. 4, When the current value exceeds above suggestive list, can select more wires used in parallel according to above list.1. 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 potentionmeter, the load current may have any value from O to rating current and adjusted by means of a coarse and fine potentionmeter. 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 Instruc- tion section. For applications when outputs greater than rating V is need, the unit can be connected up in series. For applications in audio production lines, the continuous or dynamic load internal selectable.2. SPECIFICATIONS 2-1 General Main supply 1O0V/120V/220V/240V + 10 % 50/60 Hz (Switch selectable) Rating, dimension and weight see Table 2-1. Table 2-1 Max. Rating Dimensions Weight MODEL Volts (V} Amps (A) WxHxD (m/m) Kg GPR-30H10 300 1 13.5 GPR-11H30 110 3 13.5 GPR-7550 75 5 225 (W) 18.5 - GPR-6060 60 6 145 (H) 18.5 GPR-3510H 35 10 420 (D) 18.5 GPR-1820H 18 20 18.5 GPR-0830H 8 30 18.5 (NOTE: All model with digital display available.) Operation mode Series Operation Operation Temperature & 0C to 40C, <80% Humidity Storage Temperature & Humidity Accessories 10C to 70C, <70% Test Lead GTL-105 (current <4A) uc. ccccssccssssssssesecsssussessseuseccensussssessussensraseets or GTL-104 (4<current<10A) Notes: Current > 10A without Test Lead. Operation Manual ...........cc:cccccccsscscssesessessecsseccesessecessensneseecssseasnsvacesenseeerenssearensess 22-2 {1) (2) (3) (4) (5) 2-3 (1) (2) (3) 2-4 (1) Constant Voltage Operation Output voltage ranges 0 to rating voltage continuously adjustable. Voltage regulation line reguiation<0.01%+3mV load regulation <0.01%+5mV load regulation<0.02%+5mvV (210A) Recovery time<100us (50% Load change, Minimum load 0.5A) Ripple & Noise < ImV rms (5Hz~1MHz) Temperature coefficient <300PPM/C Constant Current Operation Output current range O to rating current continuously adjustable. Current regulation line regulation < 0.2%+3mA load regulation <0.2%+5mA Ripple current<5mA rms. (<20A), <10mA rms (<30A). <20mA rms (<50A) Indicator Meter Digital Type Display: 3% Digits 0.5" Red LED Display. Accuracy: +(0.5% of rdg + 2 digits) Voltage range: 19.99V of full scale (rating voltage <18V). 199.9V of full scale (rating voltage <180V). 1999V of full scale (rating voltage <1800V) Current range: 1.999A of full scale (rating current <1.8A) 19.99A of full scale (rating current <18A) 199.94 of full scale (rating current <180A). Analog Type Meter: Voltmeter and Ammeter each one Class: 2.5 Dimensions: 60x80 m/m:25 Insulation Between chassis and output terminal 100MQ or above (DC 1000V) Between chassis and AC cord 100MQ or above (DC 1000V) 3. THEORY OF OPERATION 3-1 Low Voltage Circuit (FIG. 1) 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 com- parator, a voltage comparator, a reference voltage amplifier, tag a instant over load protection circuit and a relay control circuit. The circuit element are several of integrated circuit (U201, U202, U203, U204, U101, U205). 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 D101-D104 provides a bias voltage filtered by capacitor C101, C102 for the preregulator U101, Q101, Q102, 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 C401~C404 and then regulated via a series regulator and deliver to the output. U204 provides a reference voltage for U205, U205 acted as a current limter. When current is over predominate rating, it acted and decreased the current. U201 provides a reference voltage for U202,U202 is a invertor amplifier, U205 is a comparator amplifier. It's many be made comparator for reference voltage and detector feeaback voltage, and then deliver toQ203 this time output voitage is calibrated. Q201 is instant over load protection circuit Q201 turn on when voice response load adds at instant. It controls Q203 current magnitude of |, makes output current limited. The relay control circuit provides timited power dissipation in series requlator.3-2. High Voltage Circuit (FIG. 2) 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 rectifier circuit consisting of the main rectifier and filter, a series regulator, a current com- parator, a voltage comparator, a reference voltage amplifier, and a transistor driver consisting of rectifier and filter. The circuit element are several of integrated circuit (U201, U202, U203, U204, U101, U205). 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 D101-D104 provides a bias voltage filtered by capacitorC 101, C102 for the preregulator U101, Q101, Q102, that provides a regulator voltage for element of action. The bias voltage is provide by auxiliary rectifier (D302~D305) to turn the transistor (Q303~Qn) ON. The main rectifier is make by rectifiers and filters and then regulated via a series regulator and deliver to the output. U204 provides a reference voltage for U205,U205 acted as a current limter. When current is over predominate rating, it acted and decreased the current. U201provides a reference voltage for U202,U202 is a invertor amplifier, U205 is a comparator amplifier. It's may be made comparator for reference voltage and detector feedback voltage, and then deliver to Q202, 0203, this time output voltage is calibrated.0/P LJ TRANSF RMER t onl 25 1 Block Diagram(Less then 100V) Fig.4 2 Block Diagram (More then 100V) Fig.4. PANEL CONTROLS AND INDICATORS 4-1. Front panel (FIG. 4-1, 4-2) 42 R r CV indicator CC indicator Voltage coarse Voltage fine Current coarse Current fine +" output terminal GND terminal "* output terminal Voltmeter Ammeter Power control panel (FIG. 4-3) Fuse holder Power socket H1-LO switch AC selects switch Cooling FAN "S+" terminal "+" terminal "" terminal "S" terminal GND terminal 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 (Digital panel meter or Analoganeter) indicates the output current (Digital panel meter or analog meter) on/off switch. H!, position selects high voltage range (120V, 240V AC inputs), LO position selects low voltage range (100V, 220V AC inputs). With 5 HI-LO switch selects to permit operation from 100, 120, 220 or 240VAC, 50/60HZ line voltage. Ventilates the hot air out, to prevent output stage from thermo shock, and also improves the temperature coefficient. Positive polarity sense terminal. Positive polarity output terminal. Negative polarity output terminal. Negative polarity sense terminal. Earth and chassis ground. NOTE: if the load current is great than "10A, then the "18"~"22" terminal is used, and the output is connected from the rear panel. gPY ? & LABORATORY DC POWER SUPPLY GW INSTEK GPR-30H10D ! {OO U * JOU COARSE CURRENT c. Nv. VOLTAGE 5)(9) (8) (7)(4 3 Fig. 4-1 Front Panel (Digital Type)YP 9 9 (/ \aporaTorY pc Power supply //// GWIMSTEK cpr-aoni0 7 \\ 2 EZ FINE COARSE FINE COARSE oe) + mON SLOFF - GND ~) ee O Fig. 4-2 Front Panel (Analog Type)TI0A 720 WATTS 850 VA TSA 0~60 Hz FIG. 43. REAR PANEL5. OPERATION INSTRUCTIONS 5-1 Precaution (1) AC input AC ingut shauld he withio the cane af ling ualtage + 1Q% RA/AAK 2 | (2) Installation Avoid using the supply in a place where the ambient temperature exceeds 40C. The heat sink located at the rear of the supply must have sufficient air space for radiation. (3) Output voltage overshoot Voltage between output terminals never exceeds the preset 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 cross- over type. This permits continuous transition from constant current to constant voltage modes in response to the load change. The intersection of constant volatge 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 js reached. At that point, the output current becomes constant and the output voltage drops in proportion to furtherincreases in load. The crossover point is inuicated by the front panel LED indicators. The crossover point is reached when the CV indicator goes off and the CC indicator comes on. Vo MAX Constant Curent Range 4 lo Max + ~ + + a y \ crossover Paint Output 4 Constant Voltage Voltage Range 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. A good example of this would be seen when charging a12 Volts 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. 5-4 Operation Mode (1) Single Operation Use the supply as it is for single operation.(2) Set Power switch to OFF position. Make sure that. line voltage is correct for the input power voltage. Plug power cord into the power outlet. Set Power switch to ON position. Adjust Voltage and Current control to the desired output voltage and current. Connecti the external load to the output binding posts. Make sure both + and terminals are connected correctly. Series Operation Two power supplies may be connected in series to provide higher voltage and rating current output. See Fig. 5-2 for the connection scheme. When connected in series, the VOLTAGE controls of each power supply exercise control over a O to rating range. Add the two voltmeter readings together to determine the total output voltage, or an external voltmeter may be con- nected across the load. Load current may be monitored from either supply; the readings 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 on one of the supplies; the other may be set for maximum. TMOG > - POWER SUPPLY CONNECTED [o Lg POWER SUPPLY Fig. 5-2 Connecting Two Power Supplies in Series.6. MAINTENANCE WARNING 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). 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 tine 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) A change 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. How- ever, adjustments should be attempted only if a multimeter with an accuracy of +0.1% dev or better is available (GOOD WILL Model GDM-8035G or equivalent). ~ 156-3-1 (1) (2) Low Voltage Model (Less then 100V) If readjustment is required, use the following procedure. Locations of the adjustments are shown in Fig. 6-1 and FIG. 6-2. Adjustment of the Rating Voltage A. anTmMIOD 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 VR204 for a reading of 0 volts on the multimeter. Turn the COARSE and FINE VOLTAGE controls to maximum (fully clockwise), Adjust trimmer pot VR201 for a reading of rate volts x1.05 on the multimeter. Set the COARSE anu FINE VOLTAGE controls for a reading of rate volts on the muitimeter. Adjust trimmer pot VR209 (VR201 digital type) for a reading of rate volts on the volt meter (Digital Panet meter, digital type) of the power supply. Adjustment of the Rating Current OmnMnNOO wD Set the COARSE and FINE VOLTAGE controls to 5 Volts. Set the COARSE and FINE CURRENT controls to minimum (fully counterclockwise). Connect the external multimeter to measure dc current at the output terminals of the power supply. Setting and turn the COARSE and FINE CURRENT controls to maximum (fully clockwise). Adjust trimmer pot VR205 for a reading of rate amps x 1.05 on the multimeter. Readjust the CURRENT control for a reading of rate amps on the multimeter. Adjust trimmer pot VR210 (VR202 digital type) to calibrate the Ammeter (Digital panel meter, digital type) of the power supply for the same reading as the multimeter.6-3-2 (1) (2) High Voltage Model (More then 100V) if readjustment is required, use the following procedure. Locations of the adjustments are shown in Fig. 6-1 and FIG. 6-3, Adjustment of the Rating Voltage A. OrmMoIO A A B. Cc. D E F. G 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 VR 204 for a reading of 0 volts on the multimeter. Turn the COARSE and FINE VOLTAGE controls to maximum (fully clockwise). Adjust trimmer pot VR201 for a reading of rate volts x 1.05 on the multimeter. Set the COARSE and FINE VOLTAGE controls for a reading of rate volts on the multimeter. Adjust trimmer pot VR208 (VR201 digital type) for a reading of rate volts on the volt meter (Digital Panel meter, digital type) of the power supply. djustment of the Rating Current Set the COARSE and FINE VOLTAGE controls to 5 Volts. Set the COARSE and FINE CURRENT controls to minimum (fully counterclockwise). Connect the external multimeter to measure dc current at the output terminals of the power supply. Setting and turn the COARSE and FINE CURRENT controls to maximum (fully clockwise). Adjust trimmer pot VR205 for rate amps x 1.05 on the multimeter. Readjust the CURRENT control for a reading of rate amps on the multimeter. Adjust trimmer pot VR209 (VR202 digital type) to calibrate the Ammeter {Digital pane! meter, digital type) of the power supply for the same reading as the multimeter. NOTE: Be sure to wear rubber insulating gloves whenever operation this power supply in order to guard against electric shock hazards.PM514A PM -514A1 0201 JPO! JP16 261 Y VR202 FIG. 6-1 R201OPA-631-10 GPR-6S1-11 V A vR209 vR2i0 GPR-631-4 1) VR205 4 U207 Le FIG. 6-2SPR-632-11 CAUTION SPR-632-10 CAUTION @ HIGH VOLTAGE () HIGH VOLTAGE VR208 YR209 q CAUTION GPR-632-1 f CAUTION > HIGH VOLTAGE HIGH VOLTAGE @) 1 | 5 J202 o U207 v202 FIG. 6-3