Farnell L30 Series Instruction Book Download | Manualshive

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Summary of Contents for L30 Series

Page 1: ...Farnell SUPPLY UNITS STABILISED VOLTAGE CURRENT L30 SERIES Issue 4 INSTRUCTION BOOK ...

Page 2: ...FARNELL INSTRUMENTS LIMITED SUPPLY UNITS STABILISED VOLTAGE CURRENT L30 SERIES Issue 4 FARNELL INSTRUMENTS LTD Sandbeck Way Wetherby Yorkshire LSZ2 4DH Telephone 0937 3541 3 6 ...

Page 3: ...S INTRODUCTION Page No I SECTION II OPERATING INSTRUCTIONS 2 SECTION III CIRCUIT DESCRIPTION 4 SECTION IV SPECIFICATION 6 SECTION V INTERNAL ADJUSTMENTS 8 SECTION VI TYPICAL PERFORMANCE 9 SECTION VII MECHANICAL SPECIFICATION 16 ...

Page 4: ... means of two controls on the front panrl marked COARSE and FINE The o itput voltage or current is monitored by a switched voltmeter ammeter Overload protection is provided to protect the power unit and apparatus being supplied by limiting the output current to a set valup This value is adjustable from zero to the maximum current of the unit by means of a control on the front panel marked CURRENT ...

Page 5: ...m current is not to be exceeded then the setting up procedure is as follows With the mains supply connected to the unit mains and output switches to ON the meter switch set to CURRENT and the voltage controls set to the required value a variable load is connected to the unit and is set to give the required maximum current The current limit control is then adjusted until the current just starts to ...

Page 6: ... with a proportion of the output voltage derived from a resistive potential divider The mains supply is connected via fuse Fl SW1 and the input selector to MT1 The main secondary winding supplies a bridge rectifier reservoir capacitor system which provides the main unregulated D C line The positive line is connected via the series regulator transistors and SW2 to the positive output terminal The n...

Page 7: ...ner diode Z2a Z9a and R10A feed a fraction of this voltage to VT3a base VT3a and VT4a are the comparator transistors the base of VT4a being fed from potential divider Pla R6a and R13a If the output voltage exceeds a level determined by this potential divider VT4a conducts driving VTZa on The drive then available from VT2a collector then fires SCRla which short circuits the output terminal SECTION ...

Page 8: ...ts are set up before leaving the factory but in the event of future mis alignment the setting up procedure is as follows VOLTAGE ADJUSTMENTS 1 An accurate voltmeter is connected between the O P and O P terminals with an f s d compatible with the specified maximum output voltage of the unit With the unit switched on the link on the bottom of the unit set to CV and the VOLTAGE ADJUST controls fully ...

Page 9: ...will cany the load until it current limits thereafter the unit having the next highest 10 voltage will supply the extra current until it limits and so on A typical output characteristic for a parallel combination of three units is shown in Fig 3 The characteristic shows a series of descending steps in output voltage at the current limit points of individual units the ampli tude of the steps depend...

Page 10: ...r II as a result of unit internal temperature change caused by changing internal dissipation from a change in load or supply to the unit I Ambient Change The typical temperature co efficient of output voltage is 02 per degree centigrade of ambient change II Internal Change Fig 5 shows typical output variations caused by mains change and load change plotted against time CONSTANT VOLTS Link to CV Fo...

Page 11: ...HAM MAY BE USED IN THE EVENT OF SUPPLY DIFFICULT IES MAJOR CHANGES TO THE DESIGN OR MANUAL AKE LISTED BELOW In practice the voltage across Rs should not be less than 1 volt so that Rs should have a value of not less than Rs min I out It should also be noted that the sum of the voltages across Rs and R must not exceed the maximum ratea output voltage of the unit for the unit to meet its specificati...

Page 12: ... 1 3 o r r no T l 3 O rrr coo M r u M 171 u 1 3 M O O IE IJ A j n A J Lin 8 a m J1 S J m 1 i Kj I I L ore h 1 ft r L r L D O a o JTS LTD WETHERBY DRAWING No 3 szx aou r w ...

Page 13: ...CKED DRAWN DIP C 2 l 73 ISS 2 3 7Z DATE ft n3 Qzobl at s z MOD No NOTt CAPACITOR VALUES GIVEN IN pF RESKTOIH VALUES IN II REFEIftS TO CCT BO PIN CONNECTION No VT MISC FARNELL INSTRUMENTS LTD WETHERBY YORKS i DRAWING No 3 SZX QOH ...

Page 14: ...i i L DL 1 L TRACED CHECKED DRAWN B ISS 1 T3 2 I 7 3 ATl VT J o Ly H5 c o o O I o Q 2 20 i 1 r n i j J tO i ONt 2 Qua 02053 MOD No NOTE CAPACITOR VALUES GIVEN IN RESISTOR VALUES IN tl REFERS TO OCT BD PUN CONNECTION Noi MF FARNELL INSTRUMENTS LTD WETHERBY YORKS DRAWING No 3 ...

Page 15: ...FARNELL INSTRUMENTS LIMITED SANDBECKWAYWETHERBY YORKSHIRE LSZ2 4DH TELEPHONE 0937 3541 ...

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