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TM 11-6625-2965-14&P
TECHNICAL MANUAL
OPERATOR’S ORGANIZATIONAL
DIRECT SUPPORT AND GENERAL SUPPORT
MAINTENANCE MANUAL
[INCLUDING REPAIR PARTS
AND SPECIAL TOOLS LISTS]
POWER SUPPLY PP-7548/U
(HEWLETT-PACKARD MODEL 6205B]
[NSN 6625-00-437-4861]
HEADQUARTERS, DEPARTMENT OF THE ARMY
25 FEBRUARY 1980
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WARNING HIGH VOLTAGE is used during the performance of maintenance as instructed in this manual. DEATH ON CONTACT may result if personnel fail to observe safety precautions. DO NOT ATTEMPT to make internal connections or perform adjustments unless another person, capable of performing first aid, is present. For electric shock protection, use only extension cord and power receptacles with a safety-ground connector, or otherwise connect the chassis to a safety ground. CERTIFICATION The Hewlett-Pac
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TM 11-6625-2965-14& P This manual contains copyright material reproduced by permission of Hewlett-Packard Company TECHNICAL M ANUA L HEADQUARTERS DEPARTMENT OF THE ARMY No. 11-6625-2965-14&P WASHINGTON, DC, 25 February 1980 OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS) POWER SUPPLY PP-7548/U (HEWLETT-PACKARD MODEL) (NSN 6625-00-437-4861) REPORTING OF ERRORS YOU can improve this manual by recommending improvement
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TM 11-6625-2965-14&P TABLE OF CONTENTS Section Page No. Section Page No. 3-38 Special Operating Con- O INSTRUCTIONS . . . . . . . . . . . . . . . . 0-1 siderations 3-6 0-1 0-l Scope Pulse Loading 3-39 3-6 0-2 Indexes of Publications 0-1 3-41 Output Capacitance 3-6 0-3 Maintenance Forms, 3-43 Reverse Voltage Loading 3-6 Records and Reports 0-1 0-4 Reporting Equipment 3-45 Reverse Current Loading 3-6 Improvement Recommen- dations (EIR) 0-1 IV PRINCIPLES OF OPERATION . . . . . . . . 4-1 0-5 Adminis
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TM 11-6625-2965-14&P LIST OF ILLUSTRATIONS Figure Page No. Figure Page No. 2-1 Outline Diagram 2-1 4-2 Multiple Range Meter Circuit, 2-2 Rack Mounting, Two Units 2-2 Simplified Schematic 4-4 2-3 Rack Mounting, One Unit 2-2 5-1 Front Panel Terminal Connections 5-1 5-2 2-4 Primary Connections 2-3 Output Current Measurement Technique 3-1 Front Panel Controls and Indicators 3-1 5-1 5-3 Differential Voltmeter Substitute, 3-2 Normal Strapping Pattern 3-1 Test Setup 3-3 Current Limit Alteration 3-2 5-
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TM 11-6625-2965-14&P SECTION O INSTRUCTIONS 0-1. SCOPE This manual applies directly to Power Supply PP-7548/U (Hewlett-Packard Model 6205) having serial prefix number 7L2301 and up. For serial prefixes below 7L2301 refer to Appendix E. For serials above 7L4450 check for inclusion of change page. 0-2. INDEXES OF PUBLICATIONS a. DA Pam 310-4. Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions, changes, or additional publications pertain- ing to the equipment. b.
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TM 11-6625-2965-14&P 1-1 DESCRIPTIO N may be programmed from a remote location by means of an external voltage source or resistance. 1-2 This power supply, Figure 1-1, is completely b. Remote Sensing. The degradation in transistorized and suitable for either bench or re- regulation which would occur at the load because lay rack operations, The dual supply consists of of the voltage drop which takes place in the load leads can be reduced by using the power supply in two independently controlled d
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TM 11-6625-2965-14P trip voltage is exceeded. When Op- Rack Kit for mounting two 3½” high 14523A tion 11 is requested by the customer supplies. (Refer to Section II for de- the device is connected at the factory. tails.) Trip Voltage Range: 2.5 to 44 Volts, 1-12 INSTRUMENT AND SERVICE MANUAL screwdriver adjustable. IDENTIFICATION Detailed coverage of Option 11 is in- cluded in Appendix A at the rear of 1-13 Hewlett-Packard power supplies are identi- manuals that support power supplies fied by a
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TM 11-6625-2965-14&P Table 1-1. Specifications 0-50 or 0-5 Volt voltmeter or as a 0-0.75 or INPUT: 0.075 Amp ammeter. l15Vac ±10%, single phase, 48-440 Hz. OUTPUT CONTROLS: OUTPUT: RANGE switches select desired operating mode Two independent outputs, each of which can be set at either 0-40 Volts @ 0.3 Amp or 0-20 for each section and coarse and fine VOLTAGE controls set desired output voltages. Volts @ 0.6 Amp. LOAD REGULATION: OUTPUT TERMINALS: Less than 0,01% plus 4mV for a full load to no Six
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TM 11-6625-2965-14&P SECTION II INSTALLATION 2-1 INITIAL INSPECTION 2-2 Before shipment, this instrument was in- spected and found to be free of mechanical and electrical defects. As soon as the instrument is unpacked, inspect for any damage that may have occurred in transit. Save all packing materials until the inspection is completed. If damage is found, a claim should be filed with the carrier. Hewlett-Packard Sales and Service office should be notified. 2-3 MECHANICAL CHECK 2-4 This check sh
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TM 11-6625-2965-14&P Figure 2-2. Rack Mounting, Two Units Figure 2-3. Rack Mounting, One Unit
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TM 11-6625-2965-14&P spacing panels. Angle brackets are placed behind combining straps as shown in Figure 2-3. b. Remove four screws from front panel of unit. c. Slide combining strips between front panel and case of unit. d. Bolt angle brackets to front sides of case and replace front panel screws. 2-17 INPUT POWER REQUIREMENTS 2-18 This power supply may be operated from either a nominal 115 Volt or 230 Volt 48-440 Hertz power source. The unit, as shipped from the fac- tory, is wired for 115 Vo
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TM 11-6625-2965-14&P SECTION Ill OPERATING INSTRUCTIONS erational capabilities of the supply. A more theo- 3-1 TURN-ON CHECKOUT PROCEDURE retical description concerning these operational features is contained in Application Note 90 and in various Tech Letters. Copies of these can be obtained from your local Hewlett-Packard field office, 3-5 NORMAL OPERATING MODE 3-6 The power supply is normally shipped with its rear terminal strapping connections arranged for Constant Voltage/Current Limiting, l
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TM 11-6625-2965-14&P 3-9 CHANGING CURRENT LIMIT 3-13 If load considerations require that the output power distribution terminals be remotely located 3-10 The current limit can be varied by adjusting from the power supply, then the power supply out- resistor R81, located on the printed wiring board. put terminals should be connected to the remote This adjustment procedure is described in Para- distribution terminals via a pair of twisted or graph 5-74. In Models 6204B and 6206B, the cur- shielded
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TM 11-6625-2965-14&P programming voltage source should be approxi- mately 1000 ohms if the temperature and stability specifications of the power supply are to be main- A7 A6 A8 A10+S + GND - –S tained. The programming accuracy is 1% of the programmed voltage. 3-24 Methods of voltage programming with gain are discussed in Application Note 90, Power Supply Handbook; available at no charge from your local Sales Office. PROGRAMMING R L RESISTOR 3-25 REMOTE SENSING (See Figure 3-6) 3-26 Remote sensin
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TM 11-6625-2965-14&P ages of the individual supplies. Each of the indi- tracts directly from the available output voltage vidual supplies must be adjusted in order to obtain and also reduces the amplitude of the feedback er- the total output voltage. The power supply con- ror signals that are developed within the unit. Be- tains a protective diode connected internally cause of these factors it is recommended that the across the output which protects the supply if one drop in each load lead not e
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TM 11-6625-2965-14&P determined by its voltage control setting. units are effective and the current limit for the entire configuration is equal to the lowest current 3-34 Auto-Parallel. The strapping patterns for limit setting. If any of the settings are too low, Auto-Parallel operation of two and three power sup- automatic crossover to current limiting operation plies are shown in Figure 3-9. Auto-Parallel op- will occur and the output voltage will drop. Re- eration permits equal current sharin
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TM 11-6625-2965-14&P not desired, set the preset limit for the peak re- 3-35 AUTO-TRACKING OPERATION (See Figure 3-10) quirement and not the average. 3-36 The Auto-Tracking configuration is used when it is necessary that several different voltages 3-41 OUTPUT CAPACITANCE referred to a common bus, vary in proportion to the setting of a particular instrument (the control or 3-42 An internal capacitor, acress the output ter- master). A fraction of the master’s output voltage minals of the power sup
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TM 1 I-6625-2965-14&P SECTION IV PRINCIPLES OF OPERATION REFERENCE REGULATOR CIRCUIT t CURRENT 4 BIA S AC POWER B IA S LIMITING SUPPLY INPuT TRANSFORMER v VOLTAGES CIRCUIT * P/o 2 I ~o RECTIFIER SERIES AND REGULATOR FILTE R CURRENT Pm sAMPLING RANGE RESISTORS A SWITCH (s2 ) NOTE CONSTANT — DENOTES VOLTAG E 4 4 FEEOBACK PATH VOLTAGE INPUT 4 — DENOTES CURREN T DRIVER CIRCUIT AMPL LIMIT PATH + 4 CIRCUI T 4 1, Q Figure 4-1. Overall Block Diagram 4-1 OVERALL DESCRIPTION obtain the proper regulated dc
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TM 11-6625-2965-14&P series regulator so that the output current is limited ponents). Transistor Q1 consists of two transistors to the proper value. housed in a single package. The transistors have matched characteristics minimizing differential 4-6 The reference circuit provides stable refer- voltages due to mismatched stages. Moreover, ence voltages used in the constant voltage compar- drift due to thermal differentials is minimized, ator and current limit circuits. The bias circuit since both
