MOM200A/600A - Techno Master
Contents
1. SE 187 29 seinfo megger com Sweden www megger com ZP BBO4E MOM200A 600A EN Contents 1 Introduction 6 General ERES 6 Function description tenore tor nn 6 2 Safety 8 MNT ES 8 Symbols on the 8 Safety pnto 8 3 Control panels 10 Control panel for 200 10 Control panel for 11 4 Operating instructions 12 External measuring 13 TroubleshoOtlnig cete eae ente bete des 13 5 Application examples 14 Measuring resistance in a breaker 14 Measuring resistance at bus bar joints 15 Expanded measuring 16 Application example 16 6 Specifications 18 Specifications 2 18 Specifications MOM60D0A 18 ES 0 2 0 600 ZP BBO4E ZP BBO4E MOM200A 600A E 1 INTRODUCTION Introduction General This manual is for the MOM200A and MOM600A microohmmeters The microohmmeter is designed to measure the res2. and an ambi ent temperature of 25 C 77 F Specifications are subject to change without notice Specifications are valid at nominal input voltage and an ambient temperature of 25 C 77 F Specifications are subject to change without notice Environment Application field The instrument is intended for use in high voltage substations and indust rial environments Environment Application field The instrument is intended for use in high voltage substations and indust rial environments Temperature Operating 0 to 50 C 32 F to 122 Storage amp transport 40 C to 70 40 F to 158 F Humidity 596 9596 RH non condensing CE marking LVD 2006 95 EC EMC 2004 108 EC General Mains voltage 115 230 V AC 50 60 Hz Power consumption max 115 V 4370 VA 230 V 7360 VA Protection Miniature circuit breakers thermal cut outs Dimensions Instrument 356 x 203 x 241 mm 14 x 8 x 9 5 Transport case 610 x 290 x 360 mm 24 0 x 11 4 x 14 2 Temperature Operating 0 C to 50 32 F to 122 F Storage amp transport 40 to 70 40 F to 158 F Humidity 596 9596 RH non condensing CE marking LVD 2006 95 EC EMC 2004 108 EC General Mains voltage 115 230 V AC 50 60 Hz Power consumption 1610 VA max Protection Miniature circuit breakers thermal cut ou
3. or moving any cables or wiring Fig 3 1 Make certain the mains are de energized and the test object is grounded 2 Keep the microohmmeter disconnected from the mains while making connections 3 Ground the microohmmeter 4 Connect the microohmmeter s current cables to the test object see fig 5 Do not connect the sensing cables Measurement will be done manually using an external portable voltmeter 5 Connect the microohmmeter to the mains 6 Turn on the ON OFF switch 7 200 Select the desired current range 100 A for example using the Current range switch Select the desired current range ZP BBO4E MOM200A 600A 5 APPLICATION EXAMPLES Expanded measuring range The measuring range can be expanded by setting the current lower than what was selected using the current range switch Here you must measure and calculate the resistance manually and the accuracy is somewhat lower than normal Application example see below illustrates the procedure Application example Important Read the manual and comply with the Safety instructions before using the micro omhmmeter Always comply with local safety regula tions 1 Make certain that the mains are de ener gized and that the test object is grounded 2 Keep the microohmmeter disconnected from the mains while making connections 3 Ground the microohmmeter 4 Connect the two current cables and two sen
4. MOM200A 600A Microohmmeters User s Manual ZP BBO4E Megger IMOM200A 600A Microohmmeters User s Manual NOTICE OF COPYRIGHT amp PROPRIETARY RIGHTS 2009 Megger Sweden AB All rights reserved The contents of this manual are the property of Megger Sweden 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 Megger Sweden AB Megger Sweden AB has made every reasonable attempt to ensure the completeness and accura Cy 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 Megger Sweden 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 Megger Sweden AB products is strictly prohibited except as permitted by written license agreement with egger Sweden AB TRADEMARK NOTICES MeggerQ and Programma are trademarks registered in the U S and other countries All other brand and product names mentioned in this document are trademarks or registered trademarks of their respective companies egger Sweden AB is certified according to ISO 9001 and 14001 Megger Sweden AB Eldarv gen 4 46 8 510 195 00 2970 46 8 510 195 95
5. RUCTIONS 4 Operating instructions Important Read the manual and comply with the Safety instructions before using the micro omhmmeter Always comply with local safety regula tions Note Operating this equipment near sources of strong electric fields may cause it to display erroneous current values Since power consumption is high the instru ment requires a 16 A fuse On the MOM200A model you must set the decimal point selector so that the decimal point is located correctly for the measuring range If the display shows an 1 to the far left the current range has been exceeded 100499 2004 If the thermal cut out trips indicated by a lamp you must wait until the instrument s temperature drops The thermal cut out will then be reset automatically whereupon the microohmmeter will be ready to use again WARNING Current continues to flow for a while af ter the microohmmeter is turned off How long it continues depends on the ratio of the components in the L R circuit 1 Keep the microohmmeter disconnected from the mains while making connections 2 Ground one side of the test object 3 Ground the microohmmeter 4 Connect the two current cables on two sides of the test object 5 Connect the two sensing cables using the same polarities as those used for the current cables on two sides of the test object an
6. aker while a microohm meter is connected to it Current continues to flow for a while after the microohmmeter is turned off How long it con tinues depends on the ratio of the components in the L R circuit e Always connect protective earth ground Always use safety connecting leads Always turn the equipment off before connec ting High voltage current on input output terminals Never leave the instrument unattended while it is turned on and in the high current mode Unplug the instrument from the mains supply when it is left unattended or not in use Do not attempt to service the instrument your self Opening or removing covers may expose you to dangerous voltage If you attempt to service the instrument yourself the warranty is no longer valid Do not use any accessories that are not inten ded 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 EJ 2 600 ZP BBO4E 1 Use only approved mains detachable cable set with the instrument Main supply cables shall be rated for the maximum current for the equip ment and the cable shall meet the requirements of IEC 60227 or IEC 60245 Mains supply cables certified or approved by a recognized testing au thority are regarded as meeting this requirement 2 Refer all servicing to author
7. d as close to the test object as possible Note The sensing cables must be connected inside the current cables Otherwise the test data may be incorrect See Fig 1 TEST OBJECT Fig 1 6 Connect the microohmmeter to the mains 7 Turn on the ON OFF switch 8 200 Select the desired current range using the Current range switch MOM 004A Select the desired current ran ge using the proper Sensing current push button 9 Clear 0 set the instrument by turning the knob 16 on the variable transformer down to 0 whereupon it will enter the current generation mode and LED 12 will light up 10 Now turn the knob 16 on the variable trans former to the right until the current rises to the desired value Check the value on the digital measurement instrument The analog instrument on MOM 6004 provides only an approximate current reading To obtain the best microohm reading you should try to generate a current value as close as possible to the current that you selected with the cur rent range switch on 200 or the push buttons on MOM600A IP MOM200A 600A ZP BBO4E 111 Press resistance button R The instrument will interrupt the current flowing through the test object and enter the calculation mode After about two se conds the resistance reading will appear on the digital display expressed in microohms on model 6 or milliohms on model MOM200A The current flow
8. ing through the test object is interrupted auto matically but the reading remains visible on the display 12 Turn off and disconnect the microohmmeter from the mains before doing any disconnec tion work or moving any cables or wiring External measuring instrument If for some reason you want to use an external measuring instrument to set the measurement cur rent you can connect it to the current shunt Voltage across the current shunt is proportional to the mea surement current flowing through the test object 10 mV per 100 A 4 OPERATING INSTRUCTIONS Troubleshooting Fault Cause Remedy Display shows Current range set on If possible select ano only a 1 at instrument has been ther current range left exceeded Expand the current range using the method described in section Expanded measuring range Poor contact at ends Check the sensing cable of sensing cables connections Thermal Overload Wait until the tempe cut out has rature drops and the tripped light emitting diode goes out Mains mini Overload or faultin Reset the miniature ature circuit instrument circuit breaker If it trips breaker has again contact service tripped personnel ZP BBO4E MOM200A 600A 5 APPLICATION EXAMPLES 5 Application examples Measuring resistance in a breaker Important Read the manual and comply with the Safety instructions before using the micr
9. istances of breaker contacts bus bar joints contact elements in bus bars and other high current links When contact resistance rises because of oxidation loosened or improperly tightened threaded joints temperatures rise abnormally at the points of contact This abnormal heating reduces conductivity thereby accelerating the rise in temperature and this often leads to serious trouble The microohmmeter can be used to detect such pro blems 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 Function description Connect the instrument to the object being tested After you have adjusted the instrument to provide the desired current through the test object 100 A for ex ample the actual voltage drop across the test object will be measured automatically and all you have to do is press a button to display the actual resistance High current is generated and sent out by the instru ment during measurement A miniature circuit breaker and a thermal cut out are provided to make certain this current doesn t generate excessive heat inside the instrument The instrument is equipped with a device that guards against induction A relay short circuits the sensing input when the instrument s ON OFF switch is off and also when the instrument is in the mode To protect against external overvoltages both the current ou
10. ized personnel 3 f you need to return the instrument please use 2 SAFETY ZP BBO4E MOM200A 600A E 3 CONTROL PANELS Control panel for MOM200A Positive current output 1 Sensing terminal SENSE Negative current output lour Resistance button R Current shunt terminal SHUNT Miniature circuit breaker for mains F1 OUI Ee Miniature circuit breaker for variable trans former 8 Grounding terminal 10 11 12 13 14 15 16 ON OFF switch Mains inlet LED resistance LED current LED thermal cut out Resistance range switch Current range switch Variable transformer 200 Microhmmeter MOM200A 600A ZP BBO4E 3 CONTROL PANELS Control panel for MOM600A 1 Positive current output lout 9 Mains inlet 2 Sensing terminal SENSE 10 LED resistance 3 Negative current output lour 11 LED current 4 Resistance button R 12 LED thermal cut out 5 Sensing current push buttons 13 Miniature circuit breaker 17 A 6 Current shunt terminal SHUNT Far MOMED RM 7 Miniature circuit breaker for mains F1 14 ON OFF switch Grounding tenninal 15 Variable transformer ES 10 11 s 099999 o AK 6 E Megger MoMeooA E 13 7 14 8 39 15 9 Made in Sweden 7 MOM200A 600A 4 OPERATING INST
11. o omhmmeter Always comply with local safety regula tions Current cable Sensing cables Fig 2 1 Make certain the mains are de energized on both sides of the breaker Ground the brea ker on one side and make certain it is closed 2 Keep the microohmmeter disconnected from the mains while making connections 3 Ground the microohmmeter 4 Connect the current cables and the sensing cables with the same polarities on both sides of the breaker The sensing cables must be connected in side the current cables Otherwise the test data may be incorrect See fig 2 5 Connect the microohmmeter to the mains 6 Turn on the ON OFF switch 7 200 Select the desired current range 100 A for example using the Current range switch MOM 600A Select the desired current range 100 A for example using the proper Sen sing current push button 8 Clear 0 set the instrument by turning the knob 16 on the variable transformer down to 0 whereupon it will enter the current generation mode and LED 12 will light up 9 Increase the current as close as possible to the desired value 100 A in this case which was the range you just selected Set the current accurately using the digital measu ring instrument If you want to generate currents that are outside the selected measu ring range you must calculate the resistance manually as set forth in application example Expanded measuring range
12. see below 10 Press resistance button R whereupon the instrument will calculate the actual resistance and present it on the display 11 Turn off and disconnect the microohmmeter from the mains before doing any disconnec tion work or moving any cables or wiring MOM200A 600A ZP BBO4E 5 APPLICATION EXAMPLES Measu ring resistance at 100 A for example using the proper Sen sing current push button bus bar Joints 8 Clear 0 set the instrument by turning the MEC knob 16 on the variable transformer down Important to 0 whereupon it will enter the current Read the manual and comply with the generation mode and LED 12 will light up Safety instructions before using the micro 9 Increase the current as close as possible to omhmmeter the desired value 100 A in this case which was the range you just selected Set the cur Always comply with local safety regula rent accurately using the digital measuring tions instrument 10 Using an external voltmeter measure the voltage drop voltage across each contact element within every section of the bus bar being tested The multimeter must be set to DC and to measure voltage You must calcu late the actual resistance yourself Example If the voltage drop is 0 0067 V at a current of 100 A the resistance will be 0 0067 100 ohms i e 67 microohms 11 Turn off and disconnect the microohmmeter from the mains before doing any disconnec tion work
13. sing cables using the same polarities to the two sides measurement site The sensing cables must be connected close to the test object 5 Connect the microohmmeter to the mains 6 Turn the instrument s ON OFF switch ON 7 Select the desired current range 400 A for example using the sensing current push but tons on the MOM600A 8 Clear 0 set the instrument by turning the knob 16 on the variable transformer down to 0 whereupon it will enter the current generation mode and LED 12 will light up 9 Increase the current as close as possible to the desired value 100 A in this case Set the current accurately using the digital measu ring instrument 10 Press resistance button R The instrument will do the calculation and present an incorrect resistance reading 11 To obtain the correct resistance reading you must multiply the displayed reading by a factor of X To obtain X divide the selected current range by the generated current Example 400 100 4 Note This procedure expands the microohmmeter s measuring range but the accuracy drops somewhat 12 Turn off and disconnect the microohmmeter from the mains before doing any disconnec tion work or moving any cables or wiring vow2004 600A ZP BBO4E 5 APPLICATION EXAMPLES ZP BBO4E MOM200A 600A 6 SPECIFICATIONS Specifications MOM200A Specifications MOM600A Specifications are valid at nominal input voltage
14. tive earth ground Output 230 V model Current 0 600 Open circuit voltage 9VDC Current shunt output 10 mV 100 A 0 5 max 60 mV out max 10 V to protective earth ground MOM200A 600A ZP BBO4E Max load capacity 115 V model Current adjustment set to 10096 6 SPECIFICATIONS Output Max Rest Input cur current load time rent time 100 ADC 300 ADC 1 5 min 15 min 20A 600 ADC 10s 5 min 38A Max load capacity 230 V model Current adjustment set to 100 Output Max Rest Input current load time rent time 100 ADC 6A 300 ADC 2 5 min 15 min 16A 600 ADC 15s 5 min 32A ZP BBO4E MOM200A 600A Eg SWEDEN Megger Sweden AB Eldarvagen 4 Box 2970 SE 187 29 TABY T 46 8510 195 00 F 46 8510 195 95 E seinfo megger com UK Archcliffe Road Dover CT17 9EN England T 44 0 1304 502101 F 44 0 1304 207342 E UKsales megger com Other Technical Sales Offices Dallas USA Norristown USA Toronto CANADA Trappes FRANCE Oberursel GERMANY Johannesburg SOUTH AFRICA Kingdom of BAHRAIN Mumbai INDIA Chonburi THAILAND Sydney AUSTRALIA Megger WOD YIDDINW MMM Subject to change without notice Printed matter No ZP BBO4E BBO141IE VO1 2010
15. tput and the sensing input are decoupled to ground MOM200A is used for currents up to 200 A MOM600A can provide an output current of up to 600 A and it can be set to six different measuring ranges Full wave rectified current is used for measuring Kl 2 0 600 ZP BBO4E 1 INTRODUCTION ZP BBO4E MOM200A 600A 2 SAFETY General mmm Important Read and comply with the following in structions Always comply with local safety regula tions Symbols on the instrument Caution refer to accompanying docu ments a Protective conductor terminal mE 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 Safety instructions mm NES Warning Before measuring resistances in circuit breakers or disconnecting switches isolators always check to see that the object being tested is closed and grounded on one side If there is a current transformer in the current circuit the protective relay equipment that is connected to it must be blocked to prevent ac tuation After completing your measurements you can follow the normal procedures that are used to demagnetize current transformer cores after DC has passed through their current trans former Never open a circuit bre
16. ts Dimensions Instrument 280x 178 246 mm 11 x 7 x 9 7 Transport case 560 x 260 x 360 mm 22 x 10 2 x 14 2 Weight 14 6 kg 32 2 Ibs 26 kg 54 1 165 with accessories and transport case Current cables 2 5 16 ft 25 mm Sensing cables 2x5m 16 ft 2 5 mm Measurement section Weight 115 V model 25 kg 55 1 Ibs 43 1 kg 95 105 with accessories and transport case Weight 230 V model 24 7 kg 54 5 165 42 8 kg 94 4 105 Resistance with accessories and transport case Range 0 1999 10 Current cables 2x 5m 16 ft 50 mm 0 19 99 Sensing cables 2x5m 16 ft 2 5 mm Resolution Measurement section 10 pO lt ae Resistance Inaccuracy 1 of reading 1 digit 0 1999 utput Resolution 1400 Current H Inaccuracy 1 of reading 1 digit Open circuit voltage 4 7 VDC at 100 600 A test current Current shunt output 10 mV 100 A 0 5 max 20 mV out max 10 V to protective earth ground Output 115 V model Current 0 600 ADC Max load capacity Current adjustment set to 100 Open circuit voltage 5 2 VDC Output Min Max Rest Input current output load time current at voltage time 115 230 VAC 100 ADC 3 8V DC 5 min 15min 15 60 200ADC 3 0V DC 20s 5 min 14 7 Current shunt output 10 mV 100 0 5 max 60 mV out max 10 V to protec
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