Instruction Manual For Model 1670A Triple Output DC POWER
Contents
1. are using with the device Customers not on open account must include payment in the form of a money order or credit card For the most current repair charges please visit www bkprecision com and click on service repair Return all merchandise to B amp K Precision Corp with pre paid shipping The flat rate repair charge for Non Warranty Service does not include return shipping Return shipping to locations in North American is included for Warranty Service For overnight shipments and non North American shipping fees please contact B amp K Precision Corp B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 Include with the returned instrument your complete return shipping address contact name phone number and description of problem 13 BK En Poe EPA TO rit Wii Limited One Year Warranty B amp K Precision Corp warrants to the original purchaser that its products and the component parts thereof will be free from defects in workmanship and materials for a period of one year from date of purchase B amp K Precision Corp will without charge repair or replace at its option defective product or component parts Returned product must be accompanied by proof of the purchase date in the form of a sales receipt To obtain warranty coverage in the U S A this product must be registered by completing a warranty registration form online at www bkprecision com within fifteen 15 da2. floated to the potential at the point of connection Remember that high voltage may appear at unexpected points in defective equipment Do not float the power supply output to more than 100 volts peak with respect to chassis or earth ground c If the equipment under test is off and that equipment uses high voltage in any of its circuits under normal operation discharge high voltage capacitors before making connections or tests Some circuits retain high voltage long after the equipment is turned off 2 Use only a polarized 3 wire ac outlet This assures that the power supply chassis case and ground terminal are connected to a good earth ground and reduces danger from electrical shock 3 Don t expose high voltage needlessly Remove housings and covers only when necessary Turn off equipment while making test connections in high voltage circuits Discharge high voltage capacitors after removing power Continued on inside back cover Instruction Manual For Model 1670A Triple Output DC POWER SUPPLY Bt BK ENCIMA A B amp K Precision Corporation 22820 Savi Ranch Parkway Yorba Linda California 92887 TABLE OF CONTENTS Page TEST INSTRUMENT SAFETY inside front cover INTRODUCTION sans tdt 1 SPECIFICATIONS 22 42 cta 2 CONTROLS AND INDICATORS eeeesseenesnnenen 5 OPERATING INSTRUCTIONS eneeenennenenne 7 Safety Precautions issis isitin inaitte ehe 7 Equipment Protection Precautions
3. ueeseennnenneneen 7 Power Supply Hook up and Operation eeenseneen 7 Variable Voltage Output eeessesnsennsennenennnnnenennn nenn 7 Typical Constant Voltage Output 8 Setting Current Limit eeeeeeseneenesennesnenennennnnsne nen 8 Typical Constant Current Operation 8 Page Constant Voltage Current Characteristics eee 9 12 Vde Outpt ia aa 9 5 Vd OQutpit n nr lin 10 Dual or Triple Output eeeeesesesnnesnesneneenennen nennen 10 Connecting Outputs in Series ueeensnenennennennennen 10 MAINTENANCE os doc ricitiinisinn innen inakentlech 12 Fuse Replacement eneeeenesnnnennesenneenennen nennen 12 Instrument Repair Service 12 SERVICE INFORMATION eenesensensennennennnnne 13 LIMITED ONE YEAR WARRANTY ueenssenennenens 14 TEST INSTRUMENT SAFETY inside back cover po INTRODUCTION The B K Precision Model 1670A is a general purpose triple output DC power supply Their main outputs are versatile constant voltage or constant current regulated power source that is variable from 0 to 30 volts and 0 to 3 amps An indicator lights in the constant current mode and serves as an overload indicator in the constant voltage mode While this model is competitively priced with most single output power supplies they have the added advantage of fixed 5 volt and 12 volt outputs capable of providing up to 0 5 amps each One common application for these power supply is powerin
4. ACCURACY 1 reading 2 digit OUTPUT NO 2 VOLTAGE Fixed 12 VDC 5 CURRENT 0 to 500 mA continuous POLARITY Positive or Negative CONNECTORS Wire clips LOAD REGULATION no load to 500 mA lt 1 LINE REGULATION lt 1 RIPPLE AND NOISE lt 5 mV rms PROTECTION Short circuit protection thermal overload protection SPECIFICATIONS OUTPUT NO 3 VOLTAGE Fixed 5 VDC 5 CURRENT 0 to 500 mA continuous POLARITY Positive or Negative CONNECTORS Wire Clips LOAD REGULATION no load to 500 mA lt 1 LINE REGULATION lt 1 RIPPLE AND NOISE lt 5 mV rms PROTECTION Short circuit protection thermal overload protection SPECIFICATIONS COOLING DIMENSIONS HxWxD Variable speed thermal static control fan 4 9 x 8 5 x 9 5 124 x 216 x 242mm POWER REQUIREMENTS WEIGHT approx 115 230 VAC 50 60 Hz Alternate current 10 Ibs 4 5 kg POWER CONSUMPTION ACCESSORIES SUPPLIED 165W Instruction Manual OPERATION TEMPERATURE Spare fuse 0 TO 40 C 10 80 R H OPTIONAL ACCESSORIES 80 relative humidity for temperature up to 31 C Power Supply Hook up Cables Model TL 5A decreasing linearly to 50 relative humidity at 40 C STORAGE TEMPERATURE 15 TO 70 C lt 85 R H ENVIRONMENTAL CONDITIONS 10 80 R H Altitude up to 2000m Installation category CAT II Pollution degree 2 Mains supply voltage fluctuation up to 10 of normal voltage CON
5. INSTRUCTION dX BK PRECISION MANUAL MODEL 1670A INSTRUCTION MANUAL MODEL 1670A Triple Output DC POWER SUPPLY SN BK PRECISION TEST INSTRUMENT SAFETY WARNING Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes be performed where exposed high voltage is present An electrical shock causing 10 milliamps of current to pass through the heart will stop most human heartbeats Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can produce a lethal current under certain conditions Higher voltages are even more dangerous Your normal work habits should include all accepted practices to prevent contact with exposed high voltage and to steer current away from your heart in case of accidental contact with a high voltage Observe the following safety precautions 1 There is little danger of electrical shock from the dc output of this power supply However there are several other possible test conditions using this power supply that can create a high voltage shock hazard a If the equipment under test is the hot chassis type a serious shock hazard exists unless the equipment is unplugged just turning off the equipment does not remove the hazard or an isolation transformer is used b If the equipment under test is powered up and that equipment uses high voltage in any of its circuits the power supply outputs may be
6. TROLS AND INDCATORS POWER Switch Turns power supply on and off I power switch ON O power switch OFF Power ON light Lights when power is turned on CURRENT LIMITED Indicator Lights when variable supply is operating in constant current mode CURRENT Control Adjusts maximum output current of variable supply Read value on A meter VOLTAGE Control Adjusts output voltage of variable supply Read value on V Meter A Meter Indicates output current of variable supply Y Meter Indicates output voltage of variable supply OUTPUT Terminal Red Positive polarity output terminal 10 11 12 13 14 15 16 OUTPUT Terminal Black Negative polarity variable output terminal 12V OUTPUT Terminal red Positive polarity 12 VDC output terminal 12V OUTPUT Terminal black Negative polarity 12 VDC output terminal 5V OUTPUT Terminal black Negative polarity 5 VDC output terminal 5V OUTPUT Terminal red Positive polarity 5 VDC output terminal POWER Input connector FUSE Holder DC Fan CONTROLS AND INDICATORS Figure 1 Front Panel Controls and Indicators Figure 2 Rear Panel Model 1670A Model 1670A OPERATING INSTRUCTIONS SAFETY PRECAUTIONS Use only a polarized 3 wire outlet This assure s that the poser supply chassis and case are connected to a good earth ground and reduces danger of electrical shock There is little danger of electric shock from the
7. all outlet before cleaning Do not use liquid cleaners or aerosol cleaners Use a damp cloth for cleaning Although the power supply is protected against overload and short circuits avoiding these conditions in regular use results in maximum stability and reliability Make certain that hook up is as intended before turning power supply on Incorrect polarity may damage the equipment being powered For indoor use only POWER SUPPLY HOOK UP and OPERATION Variable Voltage Output 1 Turn off the power supply and equipment being powered NOTE Use solid copper hook up wire of at least 18 gauge Using smaller wire may increase the source resistance seen by the load thereby derating the regulation capabilities of the poser supply Tighten connections snugly to assure low resistance OPERATING INSTRUCTIONS 5 Connect the red OUTPUT terminal of the power supply to the positive polarity input of the equipment being powered Connect the black OUTPUT terminal of the power supply to the negative polarity input ofthe equipment being powered Place the POWER switch to the ON position the ON indicator should illuminate Turn on the equipment being powered Typical Constant Voltage Operation 1 Before connecting the device to be powered to the power supply determine the maximum safe load current for the device to be powered and set the current limit value see Setting Current Limit procedure in the is section Set th
8. e VOLTAGE control to minimum fully counterclockwise Turn off power supply and connect it to the device to be powered Turn on POWER switch The power ON indicator should light Increase the VOLTAGE setting until the voltage display reads the desired value If the load current exceeds the preset current limit the CURRENT LIMITED indicator will light In this case the power supply automatically switches to the constant current mode and further rotation of the VOLTAGE control will not increase the output current Setting Current Limit 1 Determine the maximum safe current for the device to be powered Rotate the VOLTAGE control away from zero until some low voltage under 1 volt is indicated Temporarily short the and OUTPUT terminals of the power supply together with a test lead Adjust the CURRENT control for the desired current limit Read the current value on the current display The current limit overload protection has now been preset Do not change the CURRENT control setting after this step Remove the short between the and OUTPUT binding posts and hook up for constant voltage operation Typical Constant Current Operation 1 Before connecting the device to be powered to the power supply determine the maximum safe voltage to be applied and set the VOLTAGE control to obtain that voltage reading on the display Determine the desired constant current value Set the CURRENT control to minimum ful
9. g of circuit boards while troubleshooting Many circuit boards require two or three input voltages with the most common values being 5 volts and 12 volts These power supplies can provide up to three outputs simultaneously Since each output is fully isolated any output can be connected for positive or negative polarity The main output voltage and current are continuously monitored by two digital LCD meters with resolution of 0 1 volt and 0 01 amp The Model 1670A can operate continuously at its maximum rated output and is fully overload protected This manual provides the information to help assure the maximum performance and longest life for your power supply OUTPUT NO 1 VOLTAGE Variable 0 30 VDC CURRENT 0 to 3 Amps POLARITY Positive or Negative CONNECTORS Binding Posts REGULATION TYPE Constant Voltage or Constant Current CONSTANT VOLTAGE MODE LOAD REGULATION 0 to rated output lt 0 05 10 mV LINE REGULATION 108 TO 132 VAC lt 0 05 10 mV RIPPLE AND NOISE lt 5 mV rms SPECIFICATIONS CONSTANT CURRENT MODE LOAD REGULATION lt 0 4 10 mA LINE REGULATION 108 TO 132 VAC 50 4 10 mA RIPPLE AND NOISE lt 10 mA rms PROTECTION Current limiting short circuit protection reverse polarity protection VOLTAGE INDICATOR 3 digit LCD VOLTAGE RESOLUTION 0 1 V VOLTAGE ACCURACY 1 reading 2 digit CURRENT INDICATOR 3 digit LCD AMMETER RESOLUTION 0 01A AMMETER
10. ly counterclockwise Turn off the power supply and connect it to the device to be powered Turn on the power supply Increase the CURRENT control setting until the desired constant current value is read on the display or set the current limit in advance before connecting the load as prescribed earlier in the setting Current Limit procedure 7 If the load current reaches the constant current value the CURRENT LIMITED indicator will light If the load current drops below the constant current value the CURRENT LIMITED indicator will go off In this case the power supply automatically switches to the constant voltage mode and further rotation of the CURRENT control will not increase the output current Constant Voltage Constant Current Characteristic The working characteristic of the variable power supply 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 lead change The intersection of constant voltage and constant current modes is called the crossover point Fig 3 shows the relations ship between this crossover points 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 lad increases up until the point where the preset current limit is reached At that point the outp
11. nts Be sure to observe polarity 1 The 12V and 5V supplies will provide up to 1 amp for a short period but thermal shutdown may occur when the output is overloaded for a few minutes Upon thermal shutdown there will be now output If thermal shutdown occurs remove the load and wait 15 minutes for the power supply to cool Normal operation may then resume 2 Overloading May also cause sever ripple I the output which could disrupt operation of the circuit being powered Excessive ripple will produce a loud hum in devices with speakers 3 You can prevent overloading by measuring the output current with an external multimeter Set the meter to measure current a 2 amp range is desirable or a 10 amp range may be used and connect is series with the load Load current up to 500 mA may be operated continuously load current greater than 500 mA must be short term maximum short term current is 1 amp 10 DUAL OR TRIPLE OUTPUT Two of the outputs or all three of the outputs may be used simultaneously if desired The three outputs are fully isolated from ground and each other thus each output may be connected for the either positive or negative polarity A typical example of a triple output application would be powering a circuit board that requires three voltages such as 5 12V and 12V Fig 4 shows how the outputs would be connected for this example and the following procedures reviews the steps of hook up 1 The variable
12. power supply output which produces a maximum of 30 volts dc However there may the great danger of electrical shock if the power supply output is connected to an external high voltage Some equipment being powered may contain high voltage and present a shock hazard Observe caution If the power supply output is floated referenced to a voltage rather than earth ground turn off the power supply and the equipment under test when making connections Never float the power supply to a potential greater than 100 volts peak with respect to earth ground Observe all TEST INSTRUMENT SAFETY precautions listed in the front of this manual EQUIPMENT PROTECTION PRECAUTIONS Avoid using the power supply in ambient temperatures above 40 C 104 F Always allow sufficient air space around the opening at the rear of the power supply and the top and side vent openings for effective air flow to prevent internal heat build up Typically a two inch space at the sides as well as a six inch space at the top and rear of the power supply is adequate DO NOT block the fan opening at the rear of the power supply or the vent on top of the power supply DO NOT place objects on top of the power supply Protection provided by the equipment may be impaired if the equipment is used in a manner not specified by the manufacturer Don t put this product to a position so that it is difficult to unplug the device from the appliance inlet Unplug this product from the w
13. pplication involving direct contact between our product and the human body or for use as a critical component in a life support device or system Here direct contact refers to any connection from or to our equipment via any cabling or switching means A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause failure of that device or system or to affect its safety or effectiveness Never work alone Someone should be nearby to render aid if necessary Training in CPR cardio pulmonary resuscitation first aid is highly recommended 15 gt BK Preisen Di WIEDER IE B amp K Precision Corporation 22820 Savi Ranch Parkway Yorba Linda California 92887 www bkprecision com 2005 B amp K Precision Corporation 481 369 9 001 Printed in China 7673 9613 1011
14. supply would be set for 12V WE will assign the variable supply as the 12V source and the fixed 12V supply as the 12V source 2 Connect the terminal of the 5V supply to circuit board common and the terminal to the 5V input of the board 3 Connect the terminal of the variable supply to circuit board common or the terminal of the 5V supply Connect the terminal of the variable supply to the 12V input of the board 4 Connect the terminal of the fixed 12V supply to circuit board common or the terminal of the 5V and variable supplies Connect the terminal of the fixed 12V supply to the 12V input of the board CONNECTING OUTPUTS IN SERIES When the 30 volt output of the variable supply is not adequate the outputs may be connected in series to provide a variable 17 to 47 volt output Since the supplies are connected in series the maximum current is the same as for the fixed voltage supplies that 500 mA continuous or 1 amp peak Connections for the configuration are shown in Fig 5 Circuit Board Figure 4 Example of Triple Output Hook up for 5V 12V and 12V 11 OPERATING INSTRUCTIONS i 17 to 47V 0 500mA continuous Connection Figure 5 Connecting Outputs in Series for Variable 17 to 47 volt output 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
15. ut current becomes constant and the output voltage drops in proportion to further increases in load The crossover point is indicated by the front panel CURRENT LIMITED indicator lighting 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 car battery Initially the open circuit voltage of the power supply may be preset for b 13 8 volts A low battery will place a heavy load on the power supply and it will operate in the constant current mode which may be adjusted of a 2 Amp charging rate AS the battery becomes charged and its voltage approaches 13 8 volts its load decreased to the point where it no longer demands the full 2 Amp charging rate This is the crossover point where the power supply goes into the constant voltage mode OPERATING INSTRUCTIONS Constant Current Range gt hs Output Voltage Crossover Point Constant Voltage Range 1 Output Current Figure 3 Constant Voltage Current Characteristics 12 VDC Output The 12 Vde is a fixed voltage supply providing up to 500 mA 0 5 amp continuous The 12 Vdc output is available at the two left OUTPUT 12V tie points Be sure to observe polarity OPERATING INSTRUCTIONS 5 VDC Output The 5 Vdc is a fixed voltage supply providing up to 500 mA 0 5 amp continuous The 5 Vdc output is available at the two right OUTPUT 5V tie poi
16. you are qualified to do so FUSE REPLACEMENT If the fuse blows the power on LED indicator 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 The fuse is located on the rear panel see Fig 2 LINE VOLTAGE 115V 230V FUSE VALUE F3AL250V F1 6AL250V 12 INSTRUMENT REPAIR SERVICE Because of the specialized skills and test equipment required for instrument repair and calibration many customers prefer to rely upon B K Precision for this service We maintenance a network of B K Precision authorized service agencies for this purpose To use this service even if the instrument is no longer under warranty follow the instructions given in the WARRANTY SERVICE INSTRUCTIONS section of this manual There is a nominal charge for instruments out or warranty BK Pale EPA TO rit Wii Service Information Warranty Service Please return the product in the original packaging with proof of purchase to the address below Clearly state in writing the performance problem and return any leads probes connectors and accessories that you are using with the device Non Warranty Service Return the product in the original packaging to the address below Clearly state in writing the performance problem and return any leads probes connectors and accessories that you
17. ys of purchase Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs The warranty is void if the serial number is altered defaced or removed B amp K Precision Corp shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitations of incidental or consequential damages So the above limitation or exclusion may not apply to you This warranty gives you specific rights and you may have other rights which vary from state to state B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 14 Continued from inside front cover If possible familiarize yourself with the equipment being tested and the location of its high voltage points However remember that high voltage may appear at unexpected points in defective equipment Use an insulated floor material or a large insulated floor mat to stand on and an insulated work surface on which to place equipment and make certain such surfaces are not damp or wet When testing ac powered equipment the ac line voltage is usually present on some power input circuits such as the on off switch fuses power transformer etc any time the equipment is connected to an ac outlet even ifthe equipment is turned off B K Precision products are not authorized for use in any a
Download Pdf Manuals
Related Search