Biddle CB-7120A_UG 电路图.pdf

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1、 INSTRUCTION MANUAL For MODEL CB-7120A CIRCUIT BREAKER TEST SET SERIAL NO. It is essential that this instruction book be read thoroughly before putting the equipment in service. RadioFans.CN 收音机爱 好者资料库 APPRECIATION We are indebted to the manufacturers of circuit breakers and motor overload relays, w

2、ho have given their time and advice in the preparation of this instruction book. IMPORTANT The information and data contained within this instruction manual are proprietary with MULTI-AMP Corporation. The equipment described herein may be protected by one or more U.S. letters patent. MULTI-AMP speci

3、fically reserves to itself all rights to such proprietary information as well as all rights under any such patent, none of which is waived by the submission of this instruction manual to anyone. The recipient, if a Government agency, acknowledges that this instruction book and the equipment describe

4、d were procured with Limited Rights to technical data as described in ASPR 9-203 (b). Copyright MULTI-AMP Corporation, 1980, 1982, 1986, 1987 Please contact factory for additional copies of this manual and current price. RadioFans.CN 收音机爱 好者资料库 1 CB-7120A Instruction Manual August 18, 2004 TABLE OF

5、CONTENTS SECTION PAGE I. Introduction A. Features and Specifications Product Bulletin B. Using the Manual 1 C. Safety Precautions 2 II. Description of Controls and Instrumentation A. Control Panel Diagram 3 B. General Description 4 C. Controls and Instrumentation 4 1. Timer Circuit 5 2. Ammeter Circ

6、uit 6 III. Input and Output Circuits A. Input 1. Input Voltage 7 2. Input Leads 7 3. Grounding 8 4. Input Lead Selection Chart 8 5. Wire Size and Conversion Tables 9 B. Output 1. Selection of Output Terminals 10 2. Output Connections 10 3. Duty Ratings and Overload Capabilities 11 IV. Test Procedure

7、s RadioFans.CN 收音机爱 好者资料库 2 CB-7120A Instruction Manual August 18, 2004 A. Testing Motor Overload Relays 12-14 B. Testing of Low Voltage Circuit Breakers 15-18 V. Maintenance of Protective Apparatus A. Maintenance of Motor Overload Relays 19-21 B. Maintenance of Molded Case Circuit Breakers 22-23 C.

8、 Maintenance of Low Voltage Circuit Breakers 24-25 D. Suggested Test Forms 26 VI. Test Set Maintenance Information A. Servicing 27 B. Repair 27 C. Adjustment of Current Actuate Circuit 28 D. Return Authorization 29 E. Warranty 30 VII. Schematic Drawing 1 CB-7120A Instruction Manual August 18, 2004 U

9、SING THIS MANUAL This manual has been written specifically for Multi-Amp Model CB-7120A Universal Circuit Breaker Test Set. All features of this test set are covered in this Instruction Manual. However, this manual is, in general, applicable to other models based on the CB-7120A which will differ sl

10、ightly in design and some have options available that may be included or excluded as specified by the purchaser. If this Instruction Manual is utilized for models other than the CB-7120A and confusion arises regarding which features and specifications apply, please refer to the product bulletin, spe

11、cifications of the unit at time of order, and the schematic diagram supplied with the test set. Every effort has been made to present the information in this Instruction Manual as accurately as possible. If the user identifies errors in content or text, please notify Multi- Amp Corporation, Attentio

12、n: Product Management Department, Dallas, Texas. Complete address and other contact information are provided on the product bulletin. Various methods are used in the text to assist the user in identifying features of the test set and to emphasize important information. When features of the test set

13、are printed in upper case letters (i.e., POWER ON) in the text, this denotes the names of these features exactly as they are shown on the test set. Entire statements, and words not related to features of the test set, are printed in upper case, italics or boldface print for emphasis. Particular atte

14、ntion should be given to these items since they will refer to safety or operating information that will prevent injury to personnel, damage to equipment or errors in operation. Some terminology used in this manual may differ according to local usage. As an example, ground and grounding are used inte

15、rchangeably with the terms earth and earthing. Field adjustments refer to adjustments that may be made on site as opposed to the factory or a calibration laboratory. Other terms may also differ. If any confusion arises regarding terminology used in this manual, please contact the factory for clarifi

16、cation. When American Standard measurements have been converted to metric equivalents in the text, they are given in the closest, most commonly used metric equivalent and rounded to the nearest one tenth. NOTE: All wire and cable referred to in this manual are to be insulated for hard service with h

17、ave finely stranded, copper conductors for high conductivity and flexibility. No other types of cable and conductors should be used. 2 CB-7120A Instruction Manual August 18, 2004 SAFETY PRECAUTIONS Please read this instruction manual carefully and completely, and thoroughly under- stand all safety p

18、recautions, warnings and operating instructions prior to operating this test set. If a situation arises that is not covered in the manual, contact your Multi-Amp Representative or Multi-Amp Corporation, Dallas, Texas, U.S.A. The design of the CB-7120A test set permits it to be operated beyond its mi

19、nimum specifications. However, operation beyond minimum specifications and to maximum limits of operation are the responsibility of the purchaser. Since the input power source, input cables and test specimens are provided by the user, suitability and/or protection of them, and any damage to them or

20、to the CB-7120A that may result from their use in conjunction with the test set is the responsibility of the user. Although the circuitry of the CB-7120A is well-protected, all possible causes of damage cannot be completely anticipated. It is incumbent upon the user to be familiar with the content o

21、f this Instruction Manual, the warranty limitations described herein, and to exercise good judgement in proper operation and application of the unit (see WARRANTY Section). WARNING DO NOT CONNECT THE MODEL CB-7120A TEST SET TO A POWER SOURCE UNTIL YOU HAVE READ THIS INSTRUCTION MANUAL COMPLETELY AND

22、 HAVE THOROUGHLY FAMILIARIZED YOURSELF WITH THE TEST SETS OPERATION. THIS TEST SET IS CAPABLE OF DANGEROUS OUTPUT CURRENT AND POTENTIALLY LETHAL OUTPUT VOLTAGE. IMPROPER OPERATION COULD CAUSE DAMAGE TO THE TEST SET AND TO THE DEVICE UNDER TEST, AND CREATE AN UNSAFE CONDITION FOR PERSONS OPERATING TH

23、E TEST SET. CAUTION When this test set is energized, all control circuitry is energized and should always be considered a shock hazard. Always regard output terminals of the test set as an energized circuit whether or not the output control system has been initiated. Each Model CB-7120A is provided

24、with a power input plug. Always use a line cord having sufficient conductor size for expected input current, the correct voltage rating and an installed grounding conductor. The chassis of the test set is connected to the input power inlet receptacle grounding connection. For the safety of the opera

25、tor and personnel in the vicinity of this test set, it must always be grounded when it is connected to a power source. If the power source receptacle is ungrounded, provision must be made for a grounding connection. The grounding circuit must never be defeated, bypassed, or otherwise modified as an

26、operational shortcut. Additionally, do not depend solely upon the grounding circuit or other safety features of the test set for protection. Read and follow operating procedures to insure personal safety. 3 CB-7120A Instruction Manual August 18, 2004 WARNING NEVER BYPASS OR DEFEAT THE GROUNDING CIRC

27、UIT OF THIS TEST SET OR IT MAY RESULT IN SERIOUS PERSONAL INJURY. Do not operate this test set in wet areas, or outdoors when the possibility of inclement weather exists. 4 CB-7120A Instruction Manual August 18, 2004 CONTROL PANEL DIAGRAM MULTI-AMP MODEL CB-7120A CIRCUIT BREAKER TEST SET 5 CB-7120A

28、Instruction Manual August 18, 2004 FUNCTIONS OF CONTROLS therefore, it is the one-way distance from the test set to the power source. 4. Select the proper wire size from the table using factors 2 and 3 above. Example: Step 1 - 100 amperes (from nameplate) Step 2 - 4 x 100 = 400 amperes Step 3 - 60 f

29、t. (18.3 m) (Distance from test set to input power source.) Step 4 - # 2 AWG (33.6 sq mm) wire size (selected from chart) 10 CB-7120A Instruction Manual August 18, 2004 NOTE: For input currents exceeding 600 amperes, it is recommended that # 2/0 (67.4 sq mm) cable be used and not exceed 50 feet (15.

30、2 m) in length. 11 CB-7120A Instruction Manual August 18, 2004 GROUNDING: For safety, a ground wire should be connected to the test set frame. The size of this conductor should not be less than 1/2 the cross sectional area of the current carrying input leads (three AWG wire-sizes less) and in no eve

31、nt smaller than # 10 (5.3 sq mm) (or the minimum size in accordance with local electrical codes and/or safety standards). CAUTION For safety of the operator, it is absolutely essential that the test set be properly and effectively grounded. INPUT LEAD SELECTION CHART 12 CB-7120A Instruction Manual A

32、ugust 18, 2004 WIRE SIZE: Conductor sizes referred to in this manual are common trade sizes given in AWG (American Wire Gage). AWG equivalents in circular mils and outside diameter (rounded to usual limits of commercial accuracy) are listed below: American Circular Approximate Wire Gage Mils O.D. in

33、 (AWG) inches - 4/0 211,600 0.73 3/0 167,800 0.61 2/0 133,100 0.55 1/0 105,500 0.49 1 83,690 0.44 2 66,370 0.39 4 41,740 0.31 6 26,250 0.22 8 16,510 0.17 10 10,380 0.12 12 6,530 0.10 14 4,107 0.08 CONVERSION TABLES Wire sizes listed above can be converted to other measurements using the following fa

34、ctors: 1 cir mil = 0.7854 sq mil = 0.0005067 sq mm = 0.00000007854 sq in. 1 sq mil = 1.273 cir mil = 0.000645 sq mm = 0.000001 sq in. 1 sq mm = 1,973 cir mil = 1,550 sq mil = 0.00155 sq in. 1 sq cm = 197,300 cir mil = 0.155 sq in = 0.00108 sq ft. Wire size varies with the type and style of conductor

35、. Conversion to metric equivalents or other wire gage measurements should be considered approximate. When in doubt, use the next standard wire size larger. Conversion factors for common linear measurements are as follows: 1 cm = 0.3937 in 1 mm = 39.37 mils = 0.03937 in. 1 in = 25.4 mm = 2.54 cm. 1 m

36、 = 39.37 in = 3.28 ft. 1 ft = 30.48 cm = 0.3048 m 13 CB-7120A Instruction Manual August 18, 2004 OUTPUT SELECTION OF THE OUTPUT TERMINAL: Several output terminals at various voltage and current ratings are provided to adapt the Multi-Amp CB-7120A Circuit Breaker Test Set to a wide variety of test ci

37、rcuit impedances. The test set can be operated most efficiently by utilizing the terminal with the highest current rating consistent with being able to obtain the desired test current. In this way, finer adjustment can be obtained by making maximum use of the variable auto- transformer range. Even t

38、he smallest currents can be obtained from the highest current terminals. The lower current terminals should be used only when testing high impedance devices where the higher current terminals do not have sufficient voltage to push the desired test current through the device. The operator should star

39、t with the highest current terminal and move to a lower current terminal only when necessary. It should be noted that there is no relationship between the ammeter ranges and the rating of the output terminal. All ammeter ranges can be used in conjunction with any of the output terminals. SELECTION O

40、F COMMON TERMINAL: The ammeter circuit of the Model CB-7120A utilizes two current transformers to measure both the very low and high currents available from these units. For the ammeter to correctly read the output current of the test set, the proper common terminal must be selected. When utilizing

41、an ammeter range associated with the COMMON 1 portion of the AMMETER RANGE switch, COMMON 1 terminal must be used; and, similarly, when utilizing an ammeter range associated with the COMMON 2 portion of the AMMETER RANGE switch, COMMON 2 terminal must be used. OUTPUT CONNECTIONS: The test set is pro

42、vided with a variety of high current test leads to connect a test specimen to the output terminals of the test set. The following information on the selection of output leads will provide the user with a guide for choosing the proper test leads for his application. Due to the voltage drop from the i

43、nductive reactance of the test circuit, a significant loss of current will result for each inch of test lead. Therefore, when choosing test leads, the length and size of lead chosen will determine the maximum available test current. It is worthwhile to sacrifice cross section of test leads for the s

44、ake of reducing length. Every inch of lead than can be eliminated provides worthwhile increases in available test current. Heating is not a significant problem in testing, even though the leads become hot. The use of # 4/0 (107.2 sq mm) welding or motion picture cable is convenient for constructing

45、test leads. Paralleling of sufficient cables provides higher test currents. Each cable can be fitted with a compression lug on each end, then bolted to the output terminals of the test set and the device under test. The two cables between the test set and the test specimen should be twisted together

46、 or bundled with tape, wire ties or cord to maintain the close proximity which minimizes inductive reactance. 14 CB-7120A Instruction Manual August 18, 2004 It is sometimes necessary to use bus bar in order to obtain the desired maximum current. When using bus bar, the buses should be run in paralle

47、l and kept as close to one another as possible. 15 CB-7120A Instruction Manual August 18, 2004 DUTY RATINGS AND OVERLOAD CAPACITIES: The Model CB-7120A is rated on a continuous duty basis as described by NEMA for test equipment in intermittent service; that is, 30 minutes ON followed by 30 minutes O

48、FF. In other words, the equipment can supply rated output current for a maximum period of 30 minutes ON provided a 30 minute cooling OFF period follows. This is a satisfactory basis of rating for testing of circuit breakers and primary injection testing of relay and current transformers. When the test set is being used for heat runs on cables, bus bars, terminations, etc., the 30 minute ON time will be exceeded. In