Model DH1715 dual—Channel Regulated Voltage/Current Power
Contents
1. 1 OPERATING FEATURES Model DH1719A 2 DH1719A 3 DH1719A 4 DH1719A 5 24V 5A 32V 4A 55V 2A 100V 1A 2 Input Power Supply 220V 10 50Hz 5 5 Cc Power Dissipation 200VAC Rate Load S200VA Q Output Voltage 10 turn 0 24V 0 32V 0 55V 0 100V z Theoretical Value of Voltage resolution 5mV T Output Current 1 turn 0 5A 0 4A 0 2A 0 1A poe Source Effect line regulation for 0 100 1x105 1mV G 2 change of output current 7 8 y Load Effect 1X 10 4 2mV z Ripple and Noise 5Hz 1MH2 r m s ImV a Type Value of Temp Coe 2X 104C Remote Control Control Volt Output Volt 10V 24 10V 32V 10V 55V 10V 100V 2 R Source Effect line regulation for 10 2mA Ol change of line volt Load Effect load regulation for 0 100 10mA gt change of load resistance z Ripple and Noise 5Hz 1mHz r m s ImA G Remote Control Con Voltage Output Current 10V S5A 10V 4A 10V 2A 10V 1A CV Mode Indication C V Indication Green LED CC Mode Indication C C Indication Red LED Operating Temperature Rang 0 40 C Relative Ambient Operating Humidity Range 20 90 RH Storage Temperature and Humidity Range Unforced air cooling Cooling Method positive or negative grounded Polarity of Output Voltage Continue Model DH1719A 2 DH1719A 3 DH1719A 4 DH1719A 5 24V 5A 32V 4A 55V 2A 100V 1A 5 Range Selec2. i Voltage amplin AC 220V ra Sampling pe Meter Circuit Figure 1 4 2 1 Description of Constant Voltage Mode The reference output voltage circuit is applied to the negative input terminal of a CV error amplifier the error voltage from the voltage sampling resistor is applied to the positive input terminal of the CV error amplifier The error signals of both voltages are compared each other and via the gate circuit by amplify then applied to the base of a regulated tube The base current of the regulator tube is changed then a stabilized output voltage can be obtained the adjustment of the output voltage is realized by setting the voltage potentiometer on the front panel 2 2 Description of Constant Current Mode The reference voltage from the control circuit is applied to the negative input terminal of a CC error amplifier the current signal from A V conversion is applied to the positive input terminal of the CC error amplifier Both signals are compared each other and then amplified to control the base voltage of the regulator tube to reach a stable current output 2 3 CV CC Conversion CV mode into CC mode Setting CC potentiometer a preset current value is provided as required the resistor load is reduced the output current is increased When the output current reaches the preset constant current value the output voltage is reduced In this case CV lamp goes off and the CC lamp lights But when the power supply is power supply is operati
3. to the extreme position counteclockwise B is 0 Within the range of the factor by adjusting the external control signal E can performer the proportional relation of the setting output current Io NOTE 1 For wiring of the external control voltage signal use a shielded cable or a pair of stranded wires NOTE 2 When the R L switch is thrown to L local position the output current can be controlled by the current setting potentiometer on the front panel manually NOTE 3 Pay attention to that the output current does not exceed the rated current be sure disconnect the short bar on the front panel Remote Control Input Output o i E n NOTE 2 Figure 5 4 7 Series Operation To obtain a higher voltage two or more instruments can be connected in series In order to eliminate potential difference among the chassis of units being due to connecting in series disconnect the ground bars of the units and connect the ground terminals together to the same potential as required ATTENTION The total series voltage should not exceed 200V 4 8 Parallel Operation In order to obtain a large output current two or more instruments can be connected in parallel then adjust their output voltage to the same voltage leve1 If differences of the output voltage appears the current initially is fed by the unit which is set at the highest voltage When the load current becomes more it will be converted to constantcurrent operating mode in this c
4. 33V 60V 5 9 Failure and Cause 5 9 1 Without Voltage Output 1 The 15V Aux Power supply does not work 2 The Local Remote R L switch position is not correct 3 The output switch is not turned on 5 9 2 The output voltage can not be set up to the required value 1 The CC point is turned to low it should be turned to higher 2 The output terminal has been shorted 3 On the PC boards Q or Q may be damaged 5 9 3 Unstable Operation 1 15V voltage of the aux Power supply does not stabilize 2 Vzor V on the PC board does not operate normally 5 10 Normal Operating Voltage of the Instrument The output terminal is a reference point when the instrument is measured 10 1 The voltage of the aux power supply is 15V 5 10 2 The voltage of each measured point on the PC board V 6 lv REFV 0 10V REFC 0 10V CCAMP 0 10V When operating in CV mode C V 0 4v C c 14V When operating in CC mode C V l4v C c 0 4v 6 COMPLETENESS OF THE INSTRUMENT The instrument suite includes 1 DHI719A master unit 2 Cartridge fuse BGxP 5x20 Input fuse 2A 3 Instrument Manual 1 set 7 STORAGE The instrument should be save up in a ventilated room where the ambient temperature is 5 45 C RH lt 90 and dew is not allowed These conditions are needed to protect the liquid crystal display in addition keep the instrument from smoke gas acid alkaline and other corro
5. Model DH1719A Regulated Voltage Current Power Supply User s Manual Dahua Company of Electronic Instrument in Beijing CONTENTS Description 1 Operating Features 2 Operating Principle 3 Structure Features 4 Applications 5 Maintenance 6 Completeness of the Instrument 7 Storage 8 Guarantee DESCRIPTION The Model DH1719A Regulated Voltage Current Power Supply is an automatic switching type of high accuracy CV CC power supply with a 3 digits display meter on the front panel The output voltage and the output current can be displayed by ON OFF switch on the front panel This instrument provides a preset circuit and an output switching circuit the output switch is an electronic type which does not generate chattering and noise When the output switch is set to OFF state the value indicated by the output voltmeter corresponds to the position of the voltage setting knob so as to preset the voltage Press OUTPUT switch the output voltage is available from OUTPUT terminal The operating modes of CV and CC are displayed by a digital LED meter on the front panel The red lamp indicates CC constant current the green lamp indicates CV constant voltage This instrument has function of the remote controlled voltage The input socket on the rear panel is controlled remotely Please carefully read this instruction manual before use the power supply
6. ase the output voltage will be reduced In this moment the power supply with the higher output voltage will start operation The total output current of the instrument is the sum of current of each unit NOTE 1 Pay attention that the output voltage of each unit does not exceed the rated voltage NOTE 2 For the instrument the output voltage setting is too low the current of several milliampers will flow in the reverse direction 4 9 Parallel Operation of Single Unit In order to increase current capacity a master unit is used to control several slave units remotely Method is the same as Section 4 6 Remote control CC Mode The output of the master unit power supply is 0 10V controlled voltage The slave units are operating in remote control constant current mode Master To Remote Ground i Control Input 9 Slave Plies a R ecu CM Ll geeeeeeeeeeerereeesseesseesseesseeeseeereesreesreesneeoneensersseesrerorerseeeseersrerseerseerseenieeniy 7 one IN Control Innit i 4 9 1 Each slave unit should be previously connected with the master unit in remote control CC operation and then adjust the current setting potentiometer to the extreme position making factor a 1 If differences of the slave unit appear should trim the current setting potentiometer 4 9 2 Connect the output terminals of all units to the load using wires of same gauge and the same length Note that the current distribution may ununform unl
7. ctor switch is thrown to V position 4 10 2 All the output terminals of the power supply are in series connection shown Fig8 4 10 3 On the top of the Figure is a master unit Resistor R1 is connected to output terminal of the uppermost unit and the remote control input jack of the first slave unit Resistor R2 is connected between the remote control input terminal of the first slave unit and the remote control input jack Of the second slave unit 4 10 4 The voltage setting potentiometer and current setting potentiometer are turned to the extreme positions of each slave unit clockwise 4 10 5 All the GROUND terminals of the instrument are connected to one common line which is connected to a potential line as required 4 10 6 Turn on both POWER and OUTUPUT switches of the master unit and the slave unit NOTE 1 For the remote control operation it is necessary to control the master unit only 2 Position of limiting current of all units must be preset previously 3 Calculation of resistors R R 4 When this instrument is operating in CV mode the CV lamps green both of the master unit and the slave unit light R E E x A 10K Q where R 20 or E SA 10XE R R3 externally connected resistor K Q E Output voltage of the master unit V E Output voltage of the slave unit 2 V If E E E then R R 5 Maintenance of the Instrument Rated Voltage 24V System 32V System 55V S
8. ess the potential different between the output terminals of the instruments and the terminal of the load are the same The slave units are connected in parallel as shown in Fig 6 4 9 3 Throw R L switch to R position The current setting potentiometer is set to the extreme position 4 9 4 Turn on the OUTPUT switches of all slave units 4 9 5 Turn on the OUTPUT switch of the master unit and adjust the control voltage lt 10V NOTE All the parallel slave units must be the same types When the instrument is operating in remote control CC mode the cc lamp always lights Master E a L CMR l Ground Remote Slave E O Oom 2 Slave E es Remote Control Input HEMR lt m I AA teres ore nineteen ys lt q Figure 7 4 10 Control Series Operan dot vingle Unit Dual tracking Power Supply Operating Mode The instrument is connected in series and controlled by one master unit The slave units can be controlled to increase the output voltage of the setup uppermost one of the instrument connected in series operates as the master unit 4 10 1 Except that the master unit is operating in L local state all the slave units are in the state of the output voltage controlled by the external voltage signal that means the master unit s R L remote local selector switch is thrown to L position while the switch of the slave unit is turned to R position V C voltage current sele
9. he voltage is available at the binding post at the moment the CV lamp green lights the constant voltage mode starts operating If the CC lamp red lights the voltage value drops in this case the instrument is in constant current Mode should set the CC setting potentiometer to the extreme position clockwise 4 3 Preset a constant current point and set the output current of the unit By above mentioned method after the constant voltage point is set press the A button and output terminal is shorted turn on the OUTPUT switch then the CC lamp lights but CV lamp goes off After the current setting potentiometer is set to the required value To keep the voltage position turn off the OUTPUT switch and remove the short bar connect the load press the OUTPUT switch the instrument provides the required current and voltage for the load V Voltage C Current Figure 3 4 4 When turn off the power supply first should turn off the OUTPUT switch then turn off the POWER switch 4 5 Remote Control CV Output The output voltage can be controlled by an external voltage of 0 10V As the external control signal its common terminal is a n output terminal 4 5 1 Turn on the R L remote loca1 selector switch to R position Turn on the V C voltage current selector switch to V position 4 5 2 Turn on the POWER switch and the OUTPUT switch the external control voltage is applied through the jac
10. he instrument is designed symmetrically between left and right on the front panel On the upper side there are two digital meters Down the meter there are two indicating lamps one is for CV mode green the other is for CC mode red A switch for output on the right of the panel is mounted There are two knobs in line as voltage potentiometer of each circuit and current setting potentiometers The two external sockets are mounted in the middle or lower part of the panel and at the bottom of the panel there are a pair of output binding posts and a screw grounded with a short bar When or to ground is needed we can connect the short bar On the bottom of the panel is L R local remote control operating selector switches respectively At the lowest bottom of the instrument s back there are one power cord and two pairs of input sockets for the remote control signal corresponding to the two ways on the front panel There is V C voltage current control operating selector switches respectively The input fuses both are mounted on the rear panel of the instrument 4 APPLICATIONS 4 1 Before operation should check L R local remote control selector whether on its right position or mot otherwise it doesn t operate generally it is at L position 4 2 Turn on the power supply press the V button by adjusting the voltage setting potentiometer to a required voltage value and then press the OUTPUT button While t
11. k on the rear panel of the unit Adjust VOLTAGE switch of the potentiometer to the extreme position clockwise adjust the external control voltage so that the output voltage becomes the desired voltage The relationships between the output voltage Eo and the external control voltage El is expressed as follows Eo 1 10 Emax E1 a V Where Em Maximum rated voltage V El External control voltage signal V OV SE lt lt l0V Term 4 is factor of 0 1 which depends on the voltage setting potentiometer Factor is 1 when VOLTAGE voltage setting potentiometer is set to the extreme positions clockwise Factor is 0 when both potentiometers are set to the extreme positions counterclockwise It is used to select the ratio of the output voltage Eo with respect to the external control voltage signal E1 Normally it is adjusted to the maximum voltage NOTE 1 The voltage of the common line of the external control voltage signal El becomes that of the output terminal NOTE 2 The input impedance across remote control input jack is approximately 20K Q The ripple may be amplified and conveyed to the output loop circuit NOTE 3 To feed the external control voltage signal a shielded cable or a pair of stranded wires is used and the shielding wire is connected to the output terminal When the wiring distance is very long should prove a full protection against noise NOTE 4 When the R L remote local switch is thr
12. meter RV5 so that the digital meter shows 0A zero amperes 3 Connect an ammeter with accuracy 20 2 to the output terminal turn on OUTPUT switch and feed the current after feeding the current for approximately 20 minutes calibrate the output current with potentiometer RV6 so the indication on the digital meter is the same as the standard ammeter 5 6 Adjustment of Maximum Variable CV Range 1 Press V Voltmeter switch and turn on OUTPUT switch 2 Turn voltage setting potentiometers to the extreme position clockwise adjust potentiometer RV2 so that the output voltage becomes Ep maximum voltage as specified 5 7 Adjustment of Maximum Variable CC Range 1 Connect an ammeter with approximately accuracy of 0 5 to the output terminal 2 Set the potentiometers to the extreme positions clockwise adjust potentiometer RV3 so that the output current becomes Io maximum current refer to table 2 Rely turn on Rely cut off 0 Eo Output voltage 5 8 Calibration of Digital Meter Press down the output switch chec Figure9 e accuracy in the subranges of 2V 20V and set RV1 to required secifications Table 2 Model DH1719A 2 DH1719A 3 DH1719A 4 DH1719A 5 Adjustment 24V 5A 32V 4A 55V 2A 100V 1A Calibrated Standard Ammeter I 5A 4A 2A 1A Max Variable CV Setting Range Eo max 25 2V 33 3V 57V 105V Max Variable CV Setting Range Io max 5 2A 3 15A 21A 1 05A setting of Relay Switch Circuit 14V 20V
13. ng in the constant current mode even of the resistor load value is reduced to zero in short circuit state the output current can not be increased it always keeps pre setting value constantly that means this instrument can automatically be converted from constant voltage mode to constant current mode so as to protect the load from over current It is an automatic CV CC crossover system type of power supply The Figure 2 shows operating points and operating domain related to the load lines The preset output voltage is 10V the limited current is 2A the operating point in non load is at A when RL 10 Q operating point B and when RL 5 Q operating point is at C The operating point moves from C to D if the resistor load is reduced from RL 5 Q to 2 5 Q the instrument operation is changed from the constant voltage domain into the constant current domain Point C is called Crossover Point owing to change modes Wen the resistor load RL is 2 5 Q the output voltage is I RL 2 2 5 5V 2 4 CC CV Conversion Constant Current Mode into Constant Voltage Mode Setting CV potentiometer a preset value applied as required When the output voltage reaches the preset constant voltage value then output current is reduced while the CC lamp goes off the CV lamp lights When the output current is 2A the resistor load is 0 Q operating point is E While the resistor load is increased to 2 5 Q the operating point moves from E to D When the operati
14. ng point is increased to 5 Q the operating point moves from D to C While the resistor load further is increased to 10 Q the operating point moves from C to B In this case the instrument is converted to the constant voltage domain When the resistor load is increased continuously to an open circuit the operating point moves from B to A Generally the voltage applied to the load is not more than the preset voltage The instrument can convert from the CC mode to the V mode in order to protect the load The point C serves as a crossover point RL 5Q Load Line or VW 1 2 5 Output Switching Circuit This instrument provides a special output switch the output voltage can be preset as required before the switch is unpressed After the voltage is adjusted press the switch This switch is an uncontacted electricity type of switch so it does not generate a mechanical spark protecting users safety 2 6 Digital Display Model TY 43 digital meter adopts LED digital tube as display unit At least one or two digits generated by the display may flicker It is not caused by the wareform or noise of output while by characteristics of the A D convertor When there is no input voltage the display will be recovered to zero automatically When the input voltage is inverse polarity will be displayed automatically When the operating voltage is 5V its input sensitivity is DC 199 9mV of full scale 3 STRUCTURE FEATURES T
15. own to the L position the output voltage can be controlled with the voltage setting potentiometer manually on the front panel NOTE 5 Make sure that the output voltage is within the rated output voltage of the instrument 4 6 Remote Control Constant Current Mode The output current can be controlled by the external control voltage signal 4 6 1 Turn on the V C voltage current selector switch to C position 4 6 2 The external control voltage signal is applied to the INPUT jack which is on the rear panel of the instrument Please note the polarities of and 4 6 3 Throw the R L switch to R remote control position 4 6 4 Turn on the power supply and output switch then the output terminal is shorted set the current setting potentiometer mounted on the front panel to obtain the required output current which is 10V at E2 In remote control mode the CC lamp still lights Output Remote Control Input O La a be _ gt NOTE 1 seeee een eeenaeasaneesnenaeneceeesuenseneneaesnen sue aensenoesnensenseenes NOTE 4 NOTE 2 Figure 4 The relationships between the external control voltage signal E and the output current Ip can be expressed as follows I 1 10 Imax E2 B A where Imax Maximum rated current A E External control voltage V O V S ES 10 V Range of is B 0 1 which depends on the current setting potentiometer when it is turned to the extreme position clockwise 0 is l while it is turned
16. sive materials be sure not to place the instrument in high temperature and more dust place so as to keep the instrument clean After delivery within 18 months if the users abide by the regulations of transportation storage and operation regulation and the quality is below the specification our company take responsible for free repair or replace a new one
17. tion Accuracy of Voltmeter 0 5 rdg 3dgts at 202 C and lt 80 RH z Maximum Allowable Application Voltage z Full Scale Fixed Range S x Ammeter Accuracy at20 2 C and lt 80 RH Irdg 5dgts Temperature Coe 400 X10 C full scale the accuracy mentioned above Zero Drift Not greater than 3dgts within 0 40 C Input Fuse 2A Output Fuse Weight lt 8kg External Dimensions 305 L X 200 W X 170 H mm Reliability of the Instrument MTBF 9 5000 hours 2 OPERATING PRINCIPLE The feature of this power supply is that the output voltage signal of constant Voltage circuit and the output current signal of constant current circuit both are applied to the GATE circuit at the same time According to requirement of the load the power supply is determined to operate in the CV mode or in the CC mode the automatic switching of the regulated voltage and the regulated current can solve the problems of over current protection of the regulated power supply and the over voltage protection of the regulated current power supply CONTROL CIRCUIT It is an adjustable reference voltage generator The output current and voltage depend on setting the reference voltage Relay Switching and gt eats Aux Supply Circuit Output Switch Circuit Reference Voltage Control Circuit o 5 _ 5 Remote 2 Remote O Control Control Circuit Signal A D Cony Recti Series and Eiig O pa
18. ystem 100V System Coefficient A 24 32 55 100V 5 MAINTENANCE 5 1 Inspection Inspect the instrument at regular intervals so that it maintains its intial performance for a certain period 5 2 Removing Dust and Dirt and Clean Treatment When the panel has become dirty wipe it lightly with a cloth moistured and a neutral soapsud and then wipe it with a clean dry cloth For cleaning the inside of the instrument remove dust from the inside of the case and ventilation holes of the cover by using a compressed air or the exhaust air of a vacuum cleaner Be carefully when cleaning dust of the 11 digital meter and always keeping it cleaning 5 3 Adjustment and Calibration of the Meter RVI Voltmeter calibration potentiometer for voltage precision RV2 Maximum voltage setting potentiometer RV3 Maximum current setting potentiometer RV4 Maximum current setting potentiometer for voltage presetting RV5 Ammeter zero setting potentiometer RV6 Current meter calibration potentiometer for current precision Figure 8 5 4 Calibration of Voltage Indication 1 Connect a digital voltmeter with accuracy 20 05 to the output terminal Turn on OUTPUT switch adjust the output voltage to 17 50V 2 Adjust potentiometer RV4 so that the digital meter indicates approximately the same voltage 5 5 Calibration of Ammeter 1 Press A button ammeter switch and turn off OUTPUT switch 2 Adjust potentio
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