Biddle SITS-120_UG 电路图.pdf

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1、Part _50377 Date 04/27/1998 INSTRUCTION MANUAL For SECONDARY INJECTION TEST SET Model SITS-120 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 REVISION HISTORY RevisionECN #Date 004/27/1998 COMMENTS Any comments or sugges

2、tions regarding the use of this test instrument or instruction manual would be appreciated. Send your comments to AVO International, 4271 Bronze Way, Dallas, TX 75237 IMPORTANT The information and data contained within this instruction manual are proprietary with AVO International. The equipment des

3、cribed herein may be protected by one or more U.S. letters patent. AVO INTERNATIONAL specifically 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,

4、if a Government agency, acknowledges that this instruction book and the equipment described were procured with Limited Rights to technical data as described in ASPR 9-203 (b). Copyright AVO International, 1998 RadioFans.CN 收音机爱 好者资料库 i SAFETY PRECAUTIONS WARNING: VOLTAGES GENERATED BY THIS INSTRUMEN

5、T CAN BE HAZARDOUS This instrument has been designed for operator safety; however, no design can completely protect against incorrect use. Electrical circuits are dangerous and can be lethal when lack of caution and poor safety practices are used. There are several standard safety precautions that s

6、hould be taken by the operator. Where applicable, IEC safety markings have been placed on the instrument to notify the operator to refer to the instruction manual for instructions on safety related topics. Refer to the following table of symbols and definitions. SymbolDescription Direct Current Alte

7、rnating Current Both direct and alternating current Earth (ground) Terminal. The SITS-120 output Ground terminals are connected to chassis ground. Protective Conductor Terminal Frame or Chassis Terminal On (Supply) Off (Supply) Caution, risk of electric shock Caution (refer to accompanying documents

8、) RadioFans.CN 收音机爱 好者资料库 ii SAFETY PRECAUTIONS CONTINUED The following are some specific safety related items associated with the SITS-120 test system. Always start with the power OFF, before connecting the power cord. Make sure outputs are off before attempting to make test connections. Always use

9、 properly insulated test leads. The test leads supplied with the unit are rated for the voltage output ratings of the test system, and should be properly used and cared for. Do not use cracked or broken test leads. Always lift and carry the test set using both carry handles. Improperly carrying the

10、unit by one handle could damage the handle. Always turn the test system off before disconnecting the power cord. Turn outputs off before removing or inserting test leads. UNDER NO CIRCUMSTANCES SHOULD THE OPERATOR PUT HIS HANDS OR TOOLS INSIDE THE TEST SYSTEM CHASSIS WITH THE TEST SYSTEM CONNECTED T

11、O A POWER SOURCE. LETHAL VOLTAGES ARE PRESENT AND MAY CAUSE SERIOUS INJURY OR DEATH! INSTALLATIONCategory II OPERATIONAL SAFETY Every consideration has been given to the design and construction of the Secondary Injection Test Set to make it a safe piece of test equipment as well as one that is accur

12、ate, reliable and easy to use. It must be remembered that the unit is capable of producing voltage and current levels that can be deadly if personnel come in contact with them. The SITS-120 unit should be properly operated and serviced by qualified individuals who have familiarized themselves with t

13、he unit and thoroughly read the instruction manual provided with it. If questions arise concerning care, operation or application of the unit that are not explained in the instruction manual, contact a AVO INTERNATIONAL representative. iii TABLE OF CONTENTS SECTIONPAGE OPERATIONAL SAFETY.ii THEORY O

14、F OPERATION.1 UNIT PANEL ILLUSTRATION.1 DESCRIPTION OF CONTROLS AND INSRUMENTATION.2 INPUT POWER.6 SELECTION OF OUTPUT TERMINALS.7 SERVICE DATA .8 MAINTENANCE INSTRUCTIONS.8 BASIC TROUBLESHOOTING.9 Power Input.9 Timer, Monitor and Battery Simulator Module.10 WARRANTY.13 TEST APPLICATIONS.14 TEST PRO

15、CEDURES.14 TIME DELAY OVERCURRENT DEVICES.14 INSTANTANEOUS ELEMENT OF OVERCURRENT RELAYS.16 TIME DELAY VOLTAGE RELAYS .18 PICKUP and DROPOUT TEST PROCEDURE FOR VOLTAGE CONTROLLED RELAYS .19 GENERAL TEST FOR TIMING OPERATIONS.20 MOLDED CASE CIRCUIT BREAKERS.21 OVERCURRENT ELEMENT OF CIRCUIT BREAKERS.

16、22 INSTANTANEOUS ELEMENT OF CIRCUIT BREAKER.24 MOTOR OVERLOAD RELAYS.26 SPECIFICATIONS.27 OPTIONS AND ACCESSORIES.30 PARTS LIST.31 SCHEMATICS.32 1 THEORY OF OPERATION The AVO Secondary Injection Test Set is a portable, self-contained unit which provide stepless, continuously adjustable current and v

17、oltage outputs. The unit is housed in a rugged, compact suitcase-type thermoplastic enclosure with convenient carry handles and removable cover. The SITS-120 unit incorporates digital metering, crystal-controlled digital timer, and solid-state control circuitry to provide a variety of independently

18、adjustable voltage and current outputs. The dual purpose volt/ammeter will provide a wide variety of accurate, switch-selectable ranges. The independent outputs enable the SITS-120 to provide current or voltage only, or a combination of the two, to meet numerous testing requirements in a wide variet

19、y of test applications. The main AC current output has selectable output ranges of 5 Amperes 0 - 140 Volts; 10 Amperes 0 - 70 Volts; 25 Amperes 0 - 40 Volts and 120 Amperes 0 - 5 Volts. The voltage outputs are switch selectable, either AC or DC, with a range of 0 - 240 Volts. UNIT PANEL ILLUSTRATION

20、 2 DESCRIPTION OF CONTROLS AND INSTRUMENTATION DESCRIPTION OF FEATURES POWER ON/OFF Switch and Input Power Connection (1): The switch controls all the input power to the unit, but no output is available until the unit is initiated. Power on is indicated by the meter displays which light up when the

21、unit is energized. The input connector is a standard IEC connector. See Input Power for description of power input and power cord selection. PAM Output Terminal (2): This output terminal provides a 10 to 30 Volts AC output to a voltage coil of a phase angle meter. It should be noted that the voltage

22、 output is in-phase with the SITS-120 main AC current output. DO NOT apply this voltage output to the current coil of a Phase Angle Meter. Optional interface cable available for PVO phase shifters, see Optional Accessories in Specifications. CURRENT Output FUSE (F2) (3): Protects the current output

23、portion of the test set. If this fuse is blown, the unit will operate but no current will be present at the current output binding posts. Fuse should be replaced with appropriate size, slow-blow, T rated fuses (see accessory list). VOLTAGE Output FUSE (F1) (4): Protects the voltage output portion of

24、 the test set. If this fuse is blown, the unit will operate but no voltage will be present at the voltage output terminals. Fuse should be replaced with appropriate size, slow-blow, T rated fuses (see accessory list). AMMETER/VOLTMETER (5): The meter reads either current or voltage over a wide range

25、. LED display shows the numeral one in the left-most digit when meter is over-ranged. VOLTS/AMPS Selector Switch(6): The meter will read either voltage or current depending on the position of this switch. The meter may be switched back and forth during a testing operation to monitor both outputs whe

26、n they are being used simultaneously. However, both outputs must be above threshold level of range selected. Range Switch (7): Decimal shifts one digit to the right for each increase in range selection. The 300 range will read beyond 300 if conditions permit the unit to produce that much output. DIS

27、PLAY Mode Switch (8): NORMAL or MEMORY mode can be selected as desired. Moving this switch during meter operation will not interfere with unit functions or meter accuracy. MEMORY: Retains highest reading of peak current attained during output operation above 8% of full scale of range selected. Readi

28、ng is retained until unit is reinitiated, Range Switch position is changed, or VOLTS/AMPS selector is switched. 3 NORMAL: Updates voltage and current readings continually as long as output is energized above threshold level. Reading is lost when output is de-energized or drops below threshold level.

29、 NOTE: Threshold level of highest meter range is not based on a percentage of the range indicated. AC, DC Selector Switch (9): Used to select either an AC or DC voltage output from the Voltage Output Terminals, controlled by the VOLTAGE Output Control Knob. TIMER (10): Used to measure the elapsed ti

30、me of operation of the device under test. The Timer is equipped with a CYCLES/SECONDS Switch for selection of either a 0.01 seconds, 0. 001 seconds or a cycles counting mode. Additionally, the RESET button is provided to reset the Timer initiate circuitry and display. Reads cycles and seconds with a

31、 variety of operating modes. Display Mode Switch (11): Selects either cycles or seconds. Seconds Scale Switch (12): Readings to two or three decimal places can be selected. CYCLES: Reads in cycles. SECS: Reads in two scales of seconds. NOTE: Changing display mode or scale during timer operation will

32、 produce erroneous readings. TIMER RESET Button (13): Used to reset the TIMER. Pressing this button will reset the Timer to all zeros. Should the test set fail to initiate upon pressing the INITIATE switch, RESET the Timer and then re-initiate. If the Timer STOP LATCH is ON, it will be necessary to

33、RESET the Timer after an external operation of a contact closure of the device under test. If it is desired to repeatedly operate the unit in the MOMENTARY Mode, without resetting the Timer, switch the STOP LATCH OFF. START/STOP Selector Switches (14): Two independent five-position selector switches

34、 are provided for selection of the Start and Stop/Monitor Gates. The left switch is used to select the Start gate operating mode, while the right switch is used to select the Stop mode. In addition, the STOP Switch is also used in conjunction with the MONITOR lamp for selecting the desired Monitor m

35、ode of operation. The following modes are provided for the START and STOP/MONITOR gates: VOLTS APPLD ( Voltage Applied): The function of this position is to monitor the application of an AC/DC voltage across the trip output of the device under test. The Timer starts or stops when an AC potential ( 6

36、0 - 300 Volts RMS) or DC potential ( 5 - 300 Volts) is applied. Note, CAT II insulated test leads required (use PN 1282 leads). 4 VOLTS RMVD ( Voltage Removed): The function of this position is to monitor the removal of an AC/DC voltage across the trip output of the device under test. The Timer star

37、ts or stops when an AC potential ( 60 - 300 Volts RMS) or DC potential ( 5 - 300 Volts) is removed. Note, CAT II insulated test leads required (use PN 1282 leads). N.O. (Normally Open): The function of this position is to monitor normally open dry contacts of the device under test. The Timer starts

38、or stops at the closing of a normally open dry contact. N.C. (Normally Closed): The function of this position is to monitor normally closed dry contacts of the device under test. The Timer starts or stops at the opening of a normally closed dry contact. INITIATE: When the START Switch is in this pos

39、ition, the Timer will start when the output is initiated using the INITIATE Switch. NOTE: A threshold current of approximately 8% of range, must be exceeded for the Timer to start. C.A. (Current Actuate): The Timer stops when the output current is interrupted by the device under test. The C.A. posit

40、ion is used when the device under test has no contacts other than those used to pass current (such as a single-pole circuit breaker). NOTE: Timer START LATCH must be OFF and output must be maintained above threshold level or timer error will result. START/STOP/MONITOR Terminals (15): Two identical,

41、independent, Start, Stop/Monitor Terminals are provided to monitor operation of relay contacts or trip SCRs. A MONITOR light is provided with the STOP Terminals. The MONITOR lamp will glow when the condition set with the STOP Selector Switch is met. LATCH ON/OFF Switches (16): These switches are used in conjunction with the START/STOP Switches and the START/STOP Terminals to supervise the starting and stopping of the Timer. START LATCH: The Timer START LATCH ON allows timing to be initiated by a Start Gate and to be stopped only by the selected Stop Gate. When unla