Manuel d'utilisation / d'entretien du produit 1794 du fabricant B&K
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Instruction Manual Model 1794 High Current Po wer Supply B PRECISION K .
Limited Two Year Warranty B & K Precision Corp. warrants to the original purchaser that its product and the component parts therof, will be free from defects in workmanship and materials for a period of two years from the data of purchase. B & K Precision Corp.
TABLE OF CONTENTS SECTION PARTICULARS PA GE NO. 1 GENERAL INFORM ATION 1 2 SPECIFIC ATIONS 2 3 INS TALLATION 3 4 OPER ATING INSTRUCTIONS 5 5 SERVICE INSTRUCTIONS 10 6 PART LIST 16 7 SCHEM ATICS 21 8 C.
1 SECTION - 1 GENERAL INFORM ATION 1.1 DESCRIPTION : The 1794 High Current Regulated D.C. Power Supply is completely solid and suitable for bench operation or standard 19" rack operation.
SECTION - 2 SPECIFIC ATIONS OUTPUT VO LT AGE : 0-32V DC continuously variable with coarse and fine voltage controls. LOAD CURRENT : 0-30 Amp max., continuously variable with coarse and fine controls. CONS TA NT VO LT AGE MODE REGUL ATION LINE : Less than ± 0.
SECTION - 3 INS TA LL ATION 3.1 INITIAL INSPECTION : As soon as the power supply 1794 unit is unpacked, inspect for any damage that may have occurred during transit. Save all packing material until inspection is completed. If any damage is found, notify the carriers immediatel y .
3.8 INPUT TAP SELECTION FOR 230V OPER ATION : In case of 230V Mains operation please ensure that shorting links on the Tap Selector board is changed to 230 V , marked on the PCB for both Mains Transformer & Auxilary Transforme r. as per the following diagram.
SECTION - 4 OPER ATING INSTRUCTIONS 4.1 TURN ON SETTING PROCEDURE : The following procedure describes the use of controls and indicators for Constant Voltage and Constant Current Mode of Operation. CONS TA NT VO LT AGE (CV) MODE : a. Set ‘PO WER ON’ Switch & keep the OUTPUT ON/OFF switch to OFF position ( ).
4.4 Positive or negative voltage can be obtained from this supply by grounding either one of the output terminals or one end of the load. Always use two leads to connect load to the suppl y , regardless of where the setup is grounded.
4.6 OUTPUT CA PA CI TA NCE : Internal capacitor C3 ( L1791-FP-CNT-0603 PCB ) connected across the output terminals of the power suppl y , helps to supply high current pulses of short duration during constant voltage operation.
OPER AT ORS SAFETY SUMMARY The general safety information in this part of the summary is for both operating & servicing personnel. Specific warnings and cautions will be found throughout the manual where they appl y , but may not appear in this summar y.
USE THE PROPER FUSE : To avoid fire hazard, use only fuse of the correct type, voltage rating and current rating as specified in the parts list for your product. For 115V operation 20A, For 230V operation 10 A Slow blo w. Refer fuse replacement to qualified service personnel.
SECTION - 5 SERVICE INSTRUCTION 5.1 GENERAL : The instrument has been tested throughly and then released for dispatch.Normall y, the unit works satisfactorily under all condition. However due to ageing / misuse or malfunctioning, the unit may become defective.
checked by substituting a new component for it ( or one which has been checked previously). Howeve r, be sure that circuit conditions are not such that a replacement transistor might also be damaged. If substitute transistors are not available, use a dynamic teste r.
5.3.6 If Fuse blows, connect the unit through a variable AC Source with a current meter and monitor the current at no load. If the current is very high (more than 2 ampere or so ) load, check for Bridge Rectifier short or shorted Diode, or Secondary W inding short, etc 5.
5.4.3 VO LT AGES AT VARIOUS PINS OF IC LM324 IS AS FOLLOWS ( IC-101 ) :- IC PIN NO. VO LT AGES & CHECK CONDITIONS PIN1 -- 0V ( WHEN V POT KEPT AT MIN. POSITION IN CV MODE ) PIN1 -- +5V ( WHEN V POT KEPT AT MAX. POSITION IN CV MODE ) PIN2 & 3-- +4.
your area. Before you purchase check the electrical parts list for the proper value rating, tolerance and description. 5.5.2 ORDERING PROCEDURE : When ordering replacement parts from B+K Inc. please include the following minimum information : 1. Power Supply Type ( 1794 ).
CAUTION Static discharge can damage any semiconductor component in this instrument. This instrument contains electrical components that are susceptible to damage from static discharge. Static voltages of 1KV to 30KV are common in unprotected environments.
FA ULT FINDING PROCEDURE ( A ) FUSE BLOWS FUSE BLO WS Is Line Voltage OK ? Adjust Proper Line Voltage. Is Fuse Rating OK ? Insert proper rating Fuse. Is Mains Transformer Tapping OK ? Adjsut the Tap according to required voltage. Are Power Diodes Connected on Heat Sink Short ? Replace the Damaged Diodes.
( B ) UNREGUL ATED O/P VOLTAGE UNREGUL ATED O/P VO LT AGE Is IC LM324 OK ? Replace the IC. Is Voltage Pot Open OR Replace the Voltage Pot and Pot W ire is Reaching PCB ? Ensure proper continuity with the PCB Are Mosfets OK ? Replace the Damaged Mosfet.
( C ) NO OUTPUT VO LT AGE. NO O/P VO LT AGE Is IC LM324 OK ? Replace It. Is Voltage Pot Short ? Replace It. Is Voltage Selection Preset Open ? Replace It. Are Zener Diodes Z1 & Z2, Preset VR1 on Preg. PCB OK ? Replace It. Are all the Auxillary W inding Ensure their proper Reaching PCB ? Connectivity with PCB.
( D ) NO DPM INDIC ATION. NO DPM INDIC ATION Is Display Completely Blank ? Is Continuity between IC7805 & DPM OK ? Does Display shows only Ensure proper Continuit y. dot Indication ? Is Continuity between IC7905 & Ensure proper Continuit y. DPM's OK ? Is Continuity between ANGD & DPM's OK ? Ensure proper Continuit y.
( E ) DPM NOT READ ( 000 ). DPM NOT READ ( V & I ) ( 000 ) Is DPM IC 707 OK ? Replace It. Does Hi and Low W ire Ensure proper Continuit y. Reach DPM's ? IC TL431 OK ? Replace It. Is minimum Resistance of Pot High ? Replace Pot. 1. Check whether Voltage Hi and Voltage Low W ire is reaching DPM.
( F ) UNIT NOT TA KE CURREN T. UNIT NOT TAKE CURRENT Is Current Set Preset R21 OK ? Replace It. Is Current Pot Short ? Replace It. Is W iring Related to Ensure proper Continuit y. Current Pot OK ? Are Load Terminals connected properly with Nut inside Unit ? Ensure proper Terminal Contact.
( G ) UNIT DIRECT LY GOES TO CC. UNIT DIRECT LY GOES TO CC Is Shunt Resistor open OR Replace Shunt Resistor Dry Soldered ? if necessar y. Is IC LM324 OK ? Replace It. Is Current select Preset Replace It. R21 Open ? Is Remote Sense Terminal Pressed ? Ensure Remote Sense Switch is Unpressed in Normal Condition.
( H ) NO CURRENT CONTROL. NO CURRENT CONTROL Is Current Pot Open ? Replace it. Are W ires related to Current Pot OK ? Ensure proper Connectivit y. 1. Check the Current Potentiomete r. It might be Open. 2. Check all W ires related to Current Potentiomete r.
( J ) POOR LOAD REGUL ATION. POOR LOAD REGUL ATION Load Terminal Nut inside Unit might be Loose. Is there any Oscillation Reduce Resistor R6 ( 2.2K ) on in CV Mode ? F/Panel PCB until Oscillation dies OU T . If Oscillation still Prevail reduce R9 to 2K on F/Panel PCB.
( L ) EXTERNAL PROGRAMMING NOT OK. EXTERNAL PROGRAMMING NOT OK Is Pot connected across INT Ensure 5K Pot connected & COM OK ? between INT and COM Terminal. Is there proper Continuity between PROG Terminal and O/P + Ve ? Ensure proper Connectivit y.
SECTION - 6 PA RT LIST & SCHEM ATICS 1. L1791-FP-CNT-0603 PCB ASSY Reference Part Reference Part Designator Description Designation Description RESISTORS R1 1K R22 500E(3206F) R2 Not Used R23 33K R3 100E R24 10K R4 3.3K R25 10K R5 1K R26 100E(3206F) R6 2.
1. L1791-FP-CNT-0603 PCB ASSY Reference Part Reference Part Designator Description Designation Description CONNECTORS J1 J2.54 - 3MSL, 3 PIN SIL 2.54mm ST LOCK MALE J1 J2.54 - 3FSL, 3 PIN SIL 2.54mm ST LOCK FEMALE CL AMPS SW1 SINGLE PUSH S W ITCH MTG.
2. PS-PREG-1791-0503 PCB ASS LY Reference Part Reference Part Designator Description Designation Description TRANSISTORS Q1 BC 109 Q4 BC 557 Q2 MPSA12 Q5 BC 547 Q3 BC 557 ZENERS Z1 4.7 V , ½W Z2 10 V , ½W PRESET VR1 5K ( 3206F ) HOR TRANSFORMER T1 EE25 PULSE TX.
4. PS-AUX-DC-L1791-0503 PCB ASS LY Reference Part Reference Part Designator Description Designation Description CAPACITORS C1 470µF/35 V , ELE C8 100n F , 50 V , DISC C2 47µF/35 V , ELE C9 470µ F ,.
6. FRONT PA NEL ASS LY Reference Part Reference Part Designator Description Designation Description POT VR1 5K, WW POT VR3 500E, WW POT VR2 1K, WW POT VR4 50E, WW POT SWITCH SW1 16A/250V ON/OFF S W ITCH 7. MAIN CHASSIS ASS LY Reference Part Designator Description RESISTOR R1 4.
1. Power ON / OFF Switch. 6. Current Fine Control. 11. Output ON / OFF Switch. 2. Voltage Coarse Control. 7. CV Mode INdication. 12. Output Terminals. 3. Voltage Fine Control. 8. Current DPM. 13. Remote Sense Switch. 4. Voltage DPM. 9. CC Mode Indication.
1. INPUT FUSE HOLDER 3. INT / EXT PROGRAM TERMINAL 5. COOLING FAN. 2. MAINS CORD. 4. PROTECTIVE GROUND 6. VENTIL ATION. BACK PA NEL L AYOUT 32.
TOP VIEW 33.
BOTTOM VIEW OF MODEL : 1790 / 1791 34.
FRONT PA NEL CONTROL PCB OF 1790 / 1791 35.
POWER MODULE PCB OF 1790 / 1791 36.
PRE REGUL ATOR / AUX. P/S PCBs 1790 / 1791 37.
Service Information Warranty Service : Please return the product in the original packaging with proof of purchase to the below address. Clearly state in writing the perfor- mance problem and return any leads, connectors and accessories that you are using with the device.
SN: 480-808-9-001 Printed in India (M-00198) B & K PRECISION COR P. 22820 Savi Ranch Parkway Yorba Linda, C A 92887 www.bkprecision.com B PRECISION K .
Un point important après l'achat de l'appareil (ou même avant l'achat) est de lire le manuel d'utilisation. Nous devons le faire pour quelques raisons simples:
Si vous n'avez pas encore acheté B&K 1794 c'est un bon moment pour vous familiariser avec les données de base sur le produit. Consulter d'abord les pages initiales du manuel d'utilisation, que vous trouverez ci-dessus. Vous devriez y trouver les données techniques les plus importants du B&K 1794 - de cette manière, vous pouvez vérifier si l'équipement répond à vos besoins. Explorant les pages suivantes du manuel d'utilisation B&K 1794, vous apprendrez toutes les caractéristiques du produit et des informations sur son fonctionnement. Les informations sur le B&K 1794 va certainement vous aider à prendre une décision concernant l'achat.
Dans une situation où vous avez déjà le B&K 1794, mais vous avez pas encore lu le manuel d'utilisation, vous devez le faire pour les raisons décrites ci-dessus,. Vous saurez alors si vous avez correctement utilisé les fonctions disponibles, et si vous avez commis des erreurs qui peuvent réduire la durée de vie du B&K 1794.
Cependant, l'un des rôles les plus importants pour l'utilisateur joués par les manuels d'utilisateur est d'aider à résoudre les problèmes concernant le B&K 1794. Presque toujours, vous y trouverez Troubleshooting, soit les pannes et les défaillances les plus fréquentes de l'apparei B&K 1794 ainsi que les instructions sur la façon de les résoudre. Même si vous ne parvenez pas à résoudre le problème, le manuel d‘utilisation va vous montrer le chemin d'une nouvelle procédure – le contact avec le centre de service à la clientèle ou le service le plus proche.
