Biddle MS-2A_UG 电路图.pdf

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1、 INSTRUCTION MANUAL For HIGH CURRENT TEST SET MODEL MS-2A 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, who have given the

2、ir time and advice in the preparation of this instruction book. IMPORTANT The information and data contained within this instruction manual are proprietary with MEGGER . The equipment described herein may be protected by one or more U.S. letters patent. MEGGER specifically reserves to itself all rig

3、hts 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 described were procured with Limited Right

4、s to technical data as described in ASPR 9-203 (b). Copyright MEGGER , 1983, 1984, 1985, 1986, 1987, 1988, 1991, 1992, 2008 RadioFans.CN 收音机爱 好者资料库 Part 710026 Rev. 1 8/1/2008 ii TABLE OF CONTENTS SECTION PAGE INTRODUCTION GENERAL DESCRIPTION.Bulletin SPECIFICATIONS.Bulletin SAFETY PRECAUTIONS. 1 TH

5、EORY OF OPERATION. 2 DESCRIPTION OF CONTROLS . 2 SELECTION OF OUTPUT TERMINAL. 5 OVERLOAD CAPACITY. 7 STORAGE AND OPERATION CONDITIONS . 8 TEST PROCEDURE. 9 TIME DELAY OF MOTOR OVERLOAD RELAYS. 9 INSTANTANEOUS ELEMENT OF MOTOR OVERLOAD RELAYS. 11 THERMAL ELEMENT OF MOLDED CASE CIRCUIT BREAKERS . 13

6、INSTANTANEOUS ELEMENT OF MOLDED CASE CIRCUIT BREAKERS . 15 CIRCUIT BREAKER GROUND FAULT TRIP DEVICES . 17 OVERLOAD DEVICES MAINTENANCE DATA . 19 MAINTENANCE OF MOLDED CASE CIRCUIT BREAKERS. 19 MAINTENANCE OF MOTOR OVERLOAD RELAYS. 20 USING THE TEST RECORD SYSTEM. 22 SERVICE DATA. 22 SERVICING. 22 SE

7、RVICE AND REPAIR ORDER INSTRUCTIONS. 24 TABLE OF CONTENTS RadioFans.CN 收音机爱 好者资料库 Part 710026 Rev. 1 8/1/2008 iii PREPARATION FOR RESHIPMENT. 25 WARRANTY STATEMENT. 25 ENVIRONMENTAL CONDITIONS. 25 OPERATIONAL ERRORS/TROUBLESHOOTING. 26 PARTS LIST. 28 INDEX. 29 SCHEMATIC DRAWINGS. 30 SAFETY PRECAUTIO

8、NS Every consideration has been given to the design and construction of the Megger Model MS-2A Portable High Current Test Set to make it a safe piece of test equipment as well as one that is accurate, reliable, and easy to use. WARNING The Model MS-2A is not designed for use on energized circuits. F

9、or the safety of the operator and protection of the instrument, do not connect it to circuits that are energized. This includes circuits that could become energized during the course of a test procedure utilizing this instrument. It must be remembered that the test set is capable of producing voltag

10、e and current levels that can be deadly if personnel come in contact with them. For safe operation, it is absolutely essential that the technician properly and effectively ground (earth) the test set. This is accomplished by connecting the input line cord to a properly grounded receptacle. CAUTION T

11、he input voltage of this instrument is not selectable. All the units are shipped from the factory set up for operation from either a nominal 115 volt or 230 volt source. If the unit is to be used on a voltage source different than the nameplate specifies, major changes in the test set are required.

12、It is necessary for the technician to contact the factory to obtain the necessary parts and instructions before attempting to change the input voltage of the test set. The MS-2A should be properly operated by qualified personnel who have familiarized themselves with the test set and thoroughly read

13、the instruction manual provided with it. If questions arise concerning the care, operation, maintenance or application of the test set, contact the Megger for assistance. SYBMOLS 1 IEC60417-5032 Alternating Current 2 IEC60417-5017 Earth (ground) Terminal 3 IEC60417-5019 Protective Conductor Terminal

14、 4 IEC60417-5007 On (Supply) 5 IEC60417-5008 Off (Supply) 6 CAUTION, Risk of danger (see Note) Part 710026 Rev. 1 8/1/2008 Page 1 THEORY OF OPERATION DESCRIPTION OF CONTROLS This section of the instruction manual describes the functions of all the various control switches, etc. which are located on

15、the control panel of the Model MS-2A. All controls are clearly marked and logically grouped so that continual reference to the instruction manual should not be necessary after the operator has become acquainted with operation of the test set. For the location of the controls described in this sectio

16、n, see MS-2A Control Panel Figure #1. POWER ON/OFF Switch: Controls input power to the test set. The self-protected switch resets after an overload, when placed in the OFF position. Displays will light when the switch is ON. Protects power output circuit of MS-2 against overloads. CONTROL FUSE: Prot

17、ects instrumentation and control circuitry against overloads. OUTPUT CONTROL: Variable autotransformer provides continuous non-stepped output from a variety of current-rated terminals. Output system is controlled by a combination of timer STOP MODE and output mode switch positions. OUTPUT ON Lamp: L

18、ights whenever output control circuit is energized. OUTPUT Terminals: A combination of the COMMON terminal and any one of the four current-designated terminals provides an output circuit. Refer to other sections of the text for an explanation of the output characteristics of these terminals. NOTE: T

19、he current designation of these terminals has no bearing on the actual current output capability of each. Much higher currents can be achieved depending on test circuit impedance and duration of the test. Output Mode Switch: Initiates the output circuit in conjunction with the appropriate Timer STOP

20、 MODE Switch position. MOMENTARY Position: Momentary ON position with spring return to OFF. Output will remain energized as long as switch is held in MOMENTARY position and is de-energized when released. Timer starts and stops in the same manner. Used for jogging the output circuit. Part 710026 Rev.

21、 1 8/1/2008 Page 2 MAINTAIN Position: Maintained ON position with spring return to OFF. Output will remain energized until appropriate STOP MODE function occurs, switch is moved to OFF position or current drops below threshold requirement. OFF Position: Test set input power remains energized but out

22、put current remains de-energized and timer will not count. AMMETER: LED displays show the numeral one in the left most position when the meter is over-ranged. RANGE SWITCH: Decimal of display shifts one digit to the right for each increase in range selection. DISPLAY MODE Switch: Selects either the

23、NORMAL or MEMORY mode of the ammeter. NORMAL Position: Ammeter updates reading continually as long as the output is energized. Reading is lost when the output is de- energized. MEMORY Position: Ammeter retains the highest peak value attained during current output operation above 8% of the full scale

24、 when using the lowest three ranges. When in the highest ammeter range (750 amp), the ammeter will retain the peak value attained during current output operation above 160 amps. Reading is retained until the output is re-initiated or RANGE SWITCH position is changed. TIMER: Automatically resets each

25、 time output is re-initiated. CYCLES/SEC. Switch: Selects cycles or seconds mode. CYCLES Position: The timer counts in whole cycles and uses the power input line frequency as timing reference. SEC. Position: The timer counts in two selectable increments and uses an internal 10kHz oscillator as timin

26、g reference. Part 710026 Rev. 1 8/1/2008 Page 3 .01/.001 Switch: Selects one of two counting increments available for the timer SEC. mode. Note: Changing the position of the CYCLE/SEC. Switch (or the .01/.001 Switch while in the SEC. position) during timer operation will produce erroneous readings.

27、CONTACTS Binding Posts: Circuit controls output and timer in the normally open or normally closed positions of the STOP MODE Switch. Note: Do not connect CONTACTS binding posts to an energized circuit. STOP MODE Switch: Selects either current actuated position to stop the current output and timer, o

28、r either of the two external contact stop mode positions. NORM. OPEN Position: With CONTACTS binding posts connected to normally open contacts, output circuit will remain energized and timer will continue to run until contacts close. NORM. CLOSED Position: With CONTACTS binding posts connected to no

29、rmally closed external contacts, output circuit will remain energized and timer will continue to run until contacts open. CURRENT Position: Timer will initiate only when the output circuit is completed and a minimum threshold current is exceeded. The minimum threshold for the lower three ranges is a

30、pproximately 8 % of full scale, whereas the minimum threshold for the highest (750 amp) range will be approximately 160 amps. Timer will continue to run until output circuit opens, current drops below threshold level, or output is de-energized. Part 710026 Rev. 1 8/1/2008 Page 4 SELECTION OF OUTPUT

31、TERMINAL Four output terminals at various voltage and current ratings are provided to adapt the MS-2A to a wide variety of test circuit impedances. The current ratings shown on the output taps are the continuous duty ratings. The test set works at peak efficiency when the outputs are used at two to

32、three times their continuous rating. In this way, finer adjustment can be obtained by making full use of the variable autotransformer range. The LOW CURRENT-HIGH VOLTAGE terminals should be used when testing high impedance devices where the lower voltage terminal(s) will not push the desired test cu

33、rrent through the device. For example, to test a breaker rated at 15 amperes, at a test multiple of 3X (45 amperes), the operator should use the 25A output tap (not the 120A tap). IT SHOULD BE NOTED THAT THERE IS NO RELATIONSHIP BETWEEN THE AMMETER RANGES AND THE RATING OF THE OUTPUT TERMINAL. All a

34、mmeter ranges can be used in conjunction with any of the output terminals. Part 710026 Rev. 1 8/1/2008 Page 5 MS-2A Control Panel Figure 1 Part 710026 Rev. 1 8/1/2008 Page 6 OVERLOAD CAPACITY Model MS-2A is rated at 0.6 KVA output and is equipped with four output terminals, each capable of supplying

35、 its rated current. The current rating of these output terminals may be exceeded for short durations provided the voltage rating is sufficient to push the desired current through the device under test and the connecting test leads. The overload capacity, represented by multiples of rated current, ve

36、rsus TIME ON and TIME OFF are given below: %Rated Maximum Minimum Current Time ON Time OFF 100 (1X) 30 minutes 30 minutes 150 (1.5X) 6 minutes 13 minutes 200 (2X) 3 minutes 8 minutes 250 (2.5X) 1 minute 6 minutes 300 (3X) 30 seconds 4 minutes 400 (4X) 7 seconds 2 minutes Model MS-2A also can be used

37、 continuously for any reasonable length of time at 70.7% of the current rating of the output terminal. EXAMPLE: Consider the terminal rated at 240 amperes: (a) 240 amperes may be drawn at any voltage from 0-2.5 volts for 30 minutes provided the test set is subsequently de-energized for 30 minutes. (

38、b) 169.7 amperes (70.7% of 240 amperes) may be continuously drawn at any voltage from 0-2.5 volts for any reasonable length of time. (c) The following overload currents may be drawn at any voltage from zero to maximum volts for the Time ON indicated, followed by the indicated Time OFF. The maximum o

39、utput voltage available when the current rating of the output terminal is exceeded (overloaded) will be less than the rated value due to the regulation of the transformer in the test set. For example, when drawing 360 amperes from the 240 ampere terminal, the maximum voltage available is approximate

40、ly 2.0 volts. Overload Current From 240 Ampere Terminal Time ON Time OFF 360 amperes 6 minutes 13 minutes 480 amperes 3 minutes 8 minutes Part 710026 Rev. 1 8/1/2008 Page 7 It should be noted that because of the impedance of the device under test and the connecting test leads, the maximum practical

41、test current available from the terminal rated 240 amperes is approximately 360 amperes. Higher currents are usually available from the terminal rated 120 amperes; HOWEVER, these higher currents are available only for very short durations as illustrated in the overload capacity table above. For example, it is possible to get 480 amperes from this terminal for seven (7) seconds, followed by two (2) minutes off. STORAGE AND OPERATION CONDITIONS The unit is housed in an industrial grade plastic enclosure. There are no special