Mjölner 200 User's manual

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User's manual

Text of Mjölner 200 User's manual

  • Programma MJLNER 200Micro-ohmmeter

    User's manual

    GEEnergy

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    GE Energy Programma Electric AB, Eldarvgen 4, SE-187 75 TBY, Sweden Tel +46 8 510 195 00 Fax +46 8 510 195 95 E-mail programma@ps.ge.com Internet www.ge.com/energy

    NOTICE OF COPYRIGHT & PROPRIETARY RIGHTS

    2006 Programma Electric AB. All rights reserved.

    The contents of this manual are the property of Programma Electric AB. No part of this work may be reproduced or transmitted in any form or by any means, except as permitted in written license agreement with Programma Electric AB. Programma Electric AB has made every reasonable attempt to ensure the completeness and accuracy of this document. However, the information contained in this manual is subject to change without notice, and does not represent a commitment on the part of Programma Electric AB. Any attached hardware schematics and technical descriptions, or software listings that disclose source code, are for informational purposes only. Reproduction in whole or in part to create working hardware or software for other than Programma Electric AB products is strictly prohibited, except as permitted by written license agreement with Programma Electric AB.

    TRADEMARK NOTICES

    Programma is a registered trademark of Programma Electric AB.

    The GE logo is registered trademark of General Electric Company.

    All other brand and product names mentioned in this document are trademarks or registered trademarks of their respective companies.

    Programma Electric AB is certified according to ISO 9001

    Contents

    1 General ............................................................4

    2 Safety 5Symbols on the instrument .......................................5

    Safety instructions ........................................................5

    3 Control panel ..................................................7

    4 Menu options ..................................................8Main Menu .......................................................................8

    Setup Menu .....................................................................8

    Result window ...............................................................9

    Memory .............................................................................9

    5 Operating instructions ...............................10General application ..................................................10

    Printer .............................................................................11Replacing printer paper ...........................................11

    Safety functions .........................................................11

    Calibration ....................................................................11

    Troubleshooting .........................................................11

    6 Application examples .................................12Test a circuit breaker both sides grounded 12

    Measuring resistance at bus-bar joints ..........13

    7 Optional accessories...................................14

    8 Specifications ...............................................15MJLNER 200 ...............................................................15

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    1 General The MJLNER 200 is designed to measure the resistance of circuit breaker contacts, bus-bar joints, contact elements in bus-bars and other high-current links.

    When contact resistance rises because of oxida-tion, loosened or improperly tightened threaded joints, temperatures rise abnormally at the points of contact. This abnormal heating reduces conduc-tivity thereby accelerating the rise in temperature and this often leads to serious trouble.

    The MJLNER 200 can be used to detect such problems early so that they can be remedied long before trouble starts. Checking contact resistance at regular intervals provides a clear indication of the state of your system.

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    2 Safety

    Safety instructions Important

    Read the manual and comply with the following in-structions before using the MJLNER 200.

    Always comply with local safety regulations.

    Warning

    Before measuring resistance in circuit breakers or disconnecting switches (isolators), always check to see that the object being tested is closed and grounded at least on one side.

    After completing your measurements, you can follow the normal procedures that are used to demagnet-ize current transformer cores after DC has passed through their current transformer.

    Never open a circuit breaker while MJLNER 200 is connected to it .

    Connection points for current cables can become hot during current generation.

    Symbols on the instrumentCaution, refer to accompanying docu-ments.

    Caution, risk of electric shock.

    Protective conductor terminal.

    WEEE, Waste Electrical and Electronic Equipment. Please utilize your local WEEE collection facilities in the dispo-sition of this product and otherwise observe all applicable requirements.

    Current continues to flow for a while after the MJLNER 200 is turned off. How long it continues depends on the ratio of the components in the L/R circuit.

    High voltage/current on input/output terminals.

    Do not attempt to service the instrument yourself. Opening or removing covers may expose you to dan-gerous voltage. If you attempt to service the instru-ment yourself the warranty is no longer valid.

    Do not use any accessories that are not intended for use together with the instrument.

    Disconnect the instrument from the mains before cleaning. Use a damp cloth for cleaning. Do not use liquid cleaners or aerosol cleaners.

    Important

    The instrument is intended for use in an industrial environment. It generates, uses and can radiate radio frequency energy and, if not installed and used in ac-cordance with these instructions, may cause interfer-ence to other devices in the vicinity. If this equipment does cause interference with other devices, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interfer-ence by one or more of the following measures:

    Reorient or relocate the receiving device

    Increase the separation between the equipments

    Connect the equipment into an outlet on a circuit different from that to which the other device(s) is con-nected

    Consult the manufacturer or field service technician for help

    Always turn the equipment off before connecting.

    Always use manufacturer approved and supplied cable sets.

    Always connect protective earth (ground).

    Never leave the instrument unattended while it is turned on.

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    Use only approved mains detachable cable set with the instrument. Main supply cables shall be rated for the maximum current for the equipment and the cable shall meet the requirements of IEC 60227 or IEC 60245. Mains supply cables certified or approved by a recognized testing authority are regarded as meeting this requirement.

    Unplug the instrument from the mains supply when it is left unattended or not in use.

    Do not expose the instrument to rain or moisture.

    Refer all servicing to Programma authorized person-nel.

    If you need to return the instrument, please use either the original crate or one of equivalent strength

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    Grounding terminal

    Connection for mains voltage

    Switch for mains voltage

    Serial interface for PC (RS232

    Remote control connector

    Printer

    LCD Display

    Keys to control the menu functions

    LED displays indicating the value of R and I

    Adjustment keys to set the measuring current and all menu values

    Status LEDs indicating the actual measuring status

    1.

    2.

    3.

    4.

    5.

    6.

    7.

    8.

    9.

    10.

    11.

    3 Control panel Error LED when the adjusted current could not be reached

    Start/Stop key with status LED

    DC+ current output

    Sensing terminals

    DC- current output

    Shunt output

    Clamp sense input

    12.

    13.

    14.

    15.

    16.

    17.

    18.

    01

    04

    03

    02

    05

    06

    07

    10

    09

    1118

    14

    15

    16

    17

    08

    12 13

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    Main MenuA few seconds after instrument power up the "Main Menu" will be displayed.

    Main Menu 14:15 Iset= 200A

    Menu Reslt 50A 100A

    ENT ESC F1 F2

    LegendIsetIset is the previously adjusted measuring current. By using the and keys, below the LED displays, the measuring current can be changed.

    MenuBy pressing the key , you enter the system menu. Further explanations see below.

    ResltReslt = Pressing the key , to display the measur-ing results.

    50APreselected value 1 of the measuring current. By press-ing , the measuring current "Iset" is changed to 50 A. The preset value (in this example 50 A) can be changed in the setup menu.

    100APreselected value 2, see preselected value 1

    4 Menu options Setup Menu

    Setup Menu SM 0 Continuos/Normal ENTER ESC

    ENT ESC F1 F2

    Press to go to the "Setup Menu"

    Use the keys and to move from one menu item to another.