Instruction Manual - Cole
Contents
1. released when the display responds The instrument will not turn on if the button is released before the display responds or if the button is held down for too long This is a safety feature to prevent the instrument being inadvertently turned on The instrument is turned off either by pressing the button again or if the instrument is running on the battery by timing out after 10 minutes of inactivity Upon switching the instrument on the display will first show Ini while it undergoes a self checking routine When Ini disappears the instrument is ready for use Test voltage A and V buttons Using these buttons one of five test voltages can be selected 250 V 500 V 1 kV 2 5 kV and 5 kV The selected voltage is shown on the display If there is an external voltage greater than 50 V on the test leads the high voltage warning indicators are flashed and the display shows this voltage instead The instrument will not perform a test if this voltage is greater than 50 V During a test the display shows the actual voltage on the test leads If the test voltage is changed during a test the new test voltage will be displayed briefly When the test has stopped the display continues to show the voltage present on the test leads Pressing either test voltage A or W button will then display the test voltage immediately before the end of the test Test start stop button A test will only start if this button is pressed held and then2. 40 C Dimensions 305 x 194 x 360 mm 12 x 7 6 x 14 2 inches Weight 6 75 kg 151b approx 11 ACCESSORIES Included Accessories 3 m lead set medium size insulated clips User guide on CD ROM Optional Accessories HV test lead sets 3x3 m with un insulated small clips 3 x 8 m with un insulated small clips 3 x 15 m with un insulated small clips 3 x 10 m with medium insulated clips 3 x 15 m with medium insulated clips 3x3 m with large insulated clips 3 x 10 m with large insulated clips 3 x 15 m with large insulated clips Control circuit test lead set 2x3 m with small insulated clips Screened HV test leads Order Code 6220 820 2000 213 8101 181 8101 182 8101 183 1000 441 1000 442 6220 811 1000 443 1000 432 6220 822 1x3 m wtih 5 kV screened un insulated small clips 6220 835 1 x 15 m with 5 kV screened un insulated small clips6311 080 12 REPAIR AND WARRANTY The instrument contains static sensitive devices and care must be taken in handling the printed circuit board If an instrument s protection has been impaired it should not be used but sent for repair by suitably trained and qualified personnel The protection is likely to be impaired if for example it shows visible damage fails to perform the intended measurements has been subjected to prolonged storage under unfavourable conditions or has been subjected to severe transport stresses NEW INSTRUMENTS ARE GUARANTEED FOR 1 YEAR FRO
3. After a test the display shows the last measurement made until the VA VW or TEST buttons are pressed Time constant At the end of a test the time constant of the circuit under test is calculated and displayed After a test the display shows the last measurement made until the VA VW or TEST buttons are pressed Measurements above 100 GQ Measurements up to 100 GQ can be made without any special precautions assuming that the test leads are reasonably clean and dry The guard lead can be used to remove the effects of surface leakage if necessary When measuring resistances above 100 GQ the test leads should not be allowed to touch each other or any other object since this will introduce leakage paths Sharp points at the test lead connections should also be avoided since this will encourage corona discharge The output is isolated and so will float relative to ground such that the positive terminal is at plus half of the test voltage and the negative terminal is at minus half of the test voltage with respect to ground Leakages therefore occur between the positive terminal and ground between the negative terminal and ground and directly between the positive and negative terminals These leakages have a significant effect and can occur through the air itself Test V ia Test V 2 2 SS 1 I FARFA a a a If the guard lead is connected to ground then since the negative terminal is at the same voltage as the guard termin
4. of dirt and other objects Test lead plugs interlock with the shutters and are released by rotating the test lead plug a quarter turn The Guard terminal is explained below and is only used in cases where surface leakage currents need to be eliminated Most measurements use just the and terminals The instrument s internal voltage generator drives the terminal with respect to the terminal current being measured in the terminal Guard terminal For basic insulation tests and where there is little possibility of surface leakage affecting the measurement it is unnecessary to use the guard terminal i e if the insulator is clean and there are unlikely to be any adverse current paths However in cable testing for example there may be surface leakage paths across the insulation between the bare cable and the external sheathing due to the presence of moisture or dirt Where it is required to remove the effect of this leakage particularly at high testing voltages a bare wire may be bound tightly around the insulation and connected via the third test lead to the guard terminal G Leakage Path To ve Terminal To Guard Terminal The guard terminal is at the same potential as the negative terminal Since the leakage resistance is effectively in parallel with the resistance to be measured the use of the guard causes the current flowing through surface leakage to be diverted from the measuring circuit The instrument
5. test voltage In this case the 8 instrument will not perform a test The high voltage warning indicators flash and the beeper sounds to warn of the hazard until the external voltage becomes less than 50 V When testing the voltage displayed is the voltage present at the test terminals of the instrument If the test voltage is changed by pressing either of the test voltage A and W buttons during a test the new test voltage is displayed momentarily After testing the voltage displayed is the voltage present on the terminals To see what the voltage was immediately prior to the end on the test press either test voltage A or W buttons Timer indicator The timer shows minutes and seconds At the start of a test the timer will start from zero and at the end of a test it will stop The duration of the last test remains on the display until another test is started Digital Display The digital display shows the resistance or current being measured during a test The Q I button toggles between the two After a test the display shows the last measurement made until the timer or voltage test settings are changed or the test start stop button is pressed Analogue display This simulates an analogue meter movement to give the user a better feel for how a measurement is progressing The analogue display shows resistance only Capacitance display At the end of a test the capacitance of the circuit under test is calculated and displayed
6. the instrument is to be repaired 2 Make a note of the RA number A returns label can be emailed or faxed to you if you wish 3 Pack the instrument carefully to prevent damage in transit 4 Ensure the returns label is attached or that the RA number is clearly marked on the outside of the package and on any correspondence before sending the instrument freight paid to Megger Copies of the original purchase invoice and packing note should be sent simultaneously by airmail to expedite clearance through customs In the case of instruments requiring repair outside the warranty period an immediate quotation can be provided when obtaining the RA number 5 You may track the progress of your return on line at www megger com Approved Service Centres A list of Approved Service Centres may be obtained from the UK address above or from Megger s website at www megger com 13 Megger Limited Archcliffe Road Dover Kent CT17 9EN England T 44 0 1 304 502101 F 44 0 1 304 207342 E uksales megger com Megger 501 Crystal Paradise Mall Off Veera Desai Road Andheri w Mumbai 400053 Maharashtra India T 91 22 26740468 F 91 22 26740465 Megger 4271 Bronze Way Dallas Texas 75237 1019 USA T 1 800 723 2861 USA ONLY T 1 214 333 3201 F 1 214 331 7399 E ussales megger com Programma GmbH Obere Zeil 2 61440 Oberursel Germany T 06171 92987 0 F 06171 92987 19 Megger products are distributed in 146 countries world
7. 0 V present on test leads m High voltage warning LCD flash shows when greater than 50 V present on test leads m 8 hours continuous testing on full charge POWER LEAD AND CHARGING If the power lead supplied is not suitable for your type of mains outlet do not use an adaptor Always use a power lead fitted with the correct plug NB A plug severed from the power lead is a hazard if plugged into a live socket Severed plugs must be destroyed immediately The instrument is fitted with a two pin IEC60320 power inlet Most power leads are made with three core cable so the ground connection will not be used Power lead cable colour coding International USA Earth Ground Yellow Green Green Neutral Blue White Live Line Brown Black If using a fused plug ensure it is fitted with a 3 Amp fuse The instrument can be powered from 95 240 V rms 10 50 60Hz With power connected the battery will charge as long as a test is not in progress The Power On Off button has a green LED which illuminates when mains power is present For best battery lifetime charge the battery after each use A completely exhausted battery will take 14 hours to recharge INSTRUMENT CONTROLS AND INDICATORS Factory use only Measurement Terminals ve Guard tve Voltage at terminals Timer ftt fh Line Input i Charging Indicator t EBEV HABE Battery level Green charging Analogue Warning 1908 _T display Power voltage at H T
8. A Caution refer to accompanying notes o Equipment protected throughout by Double Insulation Class II C Equipment complies with current EU directives Terms used in this manual The word must is used to indicate that the instructions following should be followed under all circumstances Failure to follow these instructions could result in damage to the instrument and or a hazard to the operator The word should is used to indicate that the instructions indicate best practice Cleaning Disconnect the instrument and wipe it with a clean cloth slightly damped with soapy water or Isopropyl alcohol IPA INTRODUCTION The MIT510 2 is a compact microprocessor controlled high voltage d c insulation tester powered by internal rechargeable battery or mains supply A comprehensive LCD display shows resistance current capacitance voltage and timer measurements digitally with resistance being shown in analogue as well Features include m Resistance or current measurement front panel selectable m Resistance measurement range 10 kQ to 15 TQ m Front panel selectable test voltages 250 V 500 V 1000 V 2500 V 5000 V m Incremental timer minutes amp seconds measures during test m Load capacitance measurement displayed at end of a test m LCD backlight front panel selectable m Battery level charging indicator m Mains line input presence LED m High voltage warning flashing LED shows when greater than 5
9. M THE DATE OF PURCHASE BY THE USER Note Any unauthorized prior repair or adjustment will automatically invalidate the Warranty CALIBRATION REPAIR AND SPARE PARTS For service requirements for Megger Instruments contact Megger Limited or Megger Archcliffe Road Valley Forge Corporate Centre Dover 2621 Van Buren Avenue Kent CT17 9EN Norristown PA 19403 England U S A Tel 44 0 1304 502 243 Tel 1 610 676 8579 Fax 44 0 1304 207 342 Fax 1 610 676 8625 Megger operate fully traceable calibration and repair facilities ensuring your instrument continues to provide the high standard of performance and workmanship you expect These facilities are complemented by a worldwide network of approved repair and calibration companies to offer excellent in service care for your Megger products Returning your product to Megger UK and USA service centres 1 When an instrument requires recalibration or in the event of a repair being necessary a Returns Authorisation RA number must first be obtained from one of the addresses shown above You will be asked to provide the following information to enable the Service Department to prepare in advance for receipt of your instrument and to provide the best possible service to you m Model e g MIT510 2 m Serial number to be found on the underside of the case or on the calibration certificate m Reason for return e g calibration required or repair m Details of the fault if
10. Megger MIT510 2 5kV Digital Insulation Tester USER MANUAL Dory WARNINGS Safety Warning must be observed during use m The circuit under test must be switched off de energised isolated and checked to be safe before insulation test connections are made Make sure the circuit is not re energised whilst the instrument is connected m Circuit connections must not be touched during an insulation test m After completing a test capacitive circuits must be completely discharged before disconnecting the test leads Capacitive charges can be lethal m Tested items should be firmly shorted out with a shorting link after discharge until required for use This is to guard against any stored dielectric absorption charge subsequently being released thereby raising the voltage to potentially dangerous levels m The voltage indicator and automatic discharge features should be regarded as additional safety features and not a substitute for normal safe working practice m It is rare but in certain circumstances breakdown of the circuit under test may cause the instrument to terminate the test in an uncontrolled manner possibly causing a loss of display while the circuit remains energised In this event the unit must be turned off and the circuit discharged manually m Test leads including crocodile clips must be in good order clean and with no broken or cracked insulation m The instrument should not be used if any part of it is damaged m In
11. T On Off terminals OO z ys Test Voltage Venn N GoTo ff ii controls oggie _ Warning Resistance Current 4 Dai o A ita Mana voltage at A terminals High Voltage Digital i ib i iir Backlight Warning b Omay Indicator display TI Toi Toni TI Test Time constant Capiciiante display Start Stop 1 Check connections to load see SAFETY WARNINGS 2 To turn on press Power On Off button and release after display 8 To stop the test press TEST button responds The instrument first will perform a self check during which f ila a 9 Timer will stop Ini is displayed After Ini disappears the instrument is ready for use 3 Check voltage at terminals display to be sure the load is safe to 10 Analogue display shows insulation resistance energise 11 Digital display shows resistance or current selected by pressing Q I 4 Set test voltage required with VA and VW buttons button 5 To start a test press TEST button and release after red LED shows If 12 Load capacitance will be calculated and displayed after the end of external voltage at terminals lt 50 V testing starts the test 6 TEST button red LED and display warning symbols will flash during a 13 Time constant will be displayed after the end of the test test to show high voltage present at terminals 7 Timer will count up from zero during test Power On Off button The instrument will only turn on if this button is pressed held and then
12. al the leakage into the negative terminal will be considerably reduced This will improve accuracy because the current flowing into the negative terminal is measured by the instrument and used to calculate resistance This technique is only permissible if the item under test is isolated from ground Isolated in this context means insulated by a resistance of at least 5 MQ for the positive terminal or at least 10 KQ for the negative terminal Conversely if the positive terminal is grounded then the negative terminal will be at a voltage equal to the test voltage relative to ground which will result in an increase in leakage current and worsening of measurement accuracy a ss OV Test V Ground When making measurements above 100 GQ therefore the user should ground the Guard Lead where possible otherwise parallel leakage paths may occur Alternatively screened leads are available as an optional accessory from Megger The lead to the negative terminal is fully screened The screen is plugged into the Guard terminal diverting any stray leakage currents This considerably improves measurements made with a floating output where the leads might touch each other or anything other than the test piece Circuit block diagram Discharge resistance Cable under test For 5 kV instruments C1 47 nF R1 50 KQ R2 40 kQ For 10 kV instruments C1 15 nF R1 156 kQ R2 110 kQ 10 SPECIFICATION Voltage in
13. put range 85 265 V rms 50 60Hz 60 VA Battery life Typical capacity is 6 hours continuous testing at 5 kV with a 100 MQ load Test voltages 250 V 500 V 1000 V 2500 V 5000 V Accuracy 23 C 5 kV 5 1 TQ 20 10 TQ Guard 2 error guarding 500 KQ leakage with 100 MQ load Display range Digital display 3 digits 10 KQ to 15 TQ Analogue display 100 KQ to 1 TQ Short circuit charge current 3 mA 5kV Capacitor charge time lt 3 seconds per uF at 3mA to 5 kV Capacitor discharge time lt 120 ms per uF to discharge from 5000 V to 50 V Capacitance measurement 500 V minimum test voltage 10 nF to 50 uF dependent on test voltage Capacitance measurement accuracy 23 C 5 5 nF Voltage output accuracy 0 C to 30 C 4 0 10 V of nominal test voltage at 1 GQ load Current measurement range 0 01 nA to 5 mA Current measurement accuracy 23 C 5 0 2 nA at all voltages Interference rejection 1 mA rms per 250 V test voltage up to a maximum of 2 mA Timer range Counts up to 99 minutes from start of test Test regimes Auto IR Lead set Three flexible silicon insulated leads with compact clamp Safety Meets the requirements of IEC61010 1 CAT IV 600 V EMC Meets the requirements of IEC61326 1 Operating uncertainties Refer to www megger com Operating temperature 20 C to 50 C Storage temperature 25 C to 65 C Ingress protection lid closed IP65 Humidity 90 RH non condensing at
14. released as soon as the red high voltage warning indicator LED lights The LCD and red LED high voltage warning indicators flash when the test starts A test will not start if the button is released before the red LED shows or pressed continuously for longer than 5 seconds This is a safety feature to prevent a test being started inadvertently The presence of a voltage greater than 50 V on the test leads is indicated with flashing high voltage warning indicators Testing is disabled if the external voltage exceeds 50 V Testing will stop if the test start stop button is pressed again When a test has finished the instrument will discharge the load which may take some time The operator must always check the load has been discharged before touching the test leads QII button Pressing this button toggles the digital display between the insulation resistance and current O button Pressing this button toggles the display backlight on and off High voltage warning LED This is a red LED next to the TEST button on the front panel The LED flashes when the voltage on the test inputs exceeds 50 V Line input present LED This is a green LED next to the power On Off button on the front panel It is illuminated whenever the mains power is connected Test terminals There are three test terminals marked and G These terminals are designed to accept only the test leads supplied Shutters across the terminals prevent accidental ingress
15. sulation testing in wet weather conditions might be hazardous It is recommended that this instrument is not used in these circumstances If this is unavoidable the user must take all necessary precautions m This instrument is not intrinsically safe and must not be used in hazardous atmospheres NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and or their employers are reminded that National Health and Safety Legislation requires them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits Where the assessments show that the risk is significant then the use of fused test leads may be appropriate CONTENTS Safety warnings Cleaning Introduction Power lead and charging Instrument controls and indicators Power On Off button Test voltage A and W buttons Test start stop button Q I button o button High voltage warning LED Line input present LED Test terminals Guard terminal Factory programming socket Battery bar graph Voltage at terminals Timer indicator Digital display Analogue display Capacitance display Time constant Measurements above 100 GQ Circuit block diagram Specification Accessories Repair and Warranty O90 D_ 90 0 0 0 0 ANNNNA GI I II I DU A KW YN Pe ee wn OG Symbols used on the instrument are AX Caution risk of electric shock
16. therefore reads the leakage of the insulator ignoring leakage across its surface The display will show FUS if the internal guard terminal fuse is found to have blown The instrument must be switched off to clear the message before further testing is permitted The fuse should be replaced by an authorised repairer The instrument may be used in the mean time if the guard terminal not used Refer to notes regarding measurements above 100 GQ on page 9 Factory programming socket This is a 9 pin socket under the hinged cover and is not for customer use Battery bar graph This is a battery symbol on the LCD display comprising 4 pairs of segments The battery is monitored continuously when the instrument is turned on The charge remaining in the battery is shown in the table INNI Tests cannot be started and the battery may fail J at any time Symbol flashes when there is not enough charge below Fully charged battery 50 charged battery Z rg N for a test The instrument then turns itself off When mains power is present the indicator shows the battery is being charged by animating the segments of the bar graph Voltage at terminals The test voltage will default to that selected in the previous test If the instrument has been switched off since the previous test the test voltage defaults to 250 V If there is an external voltage greater than 50 V present this will be displayed regardless of changes made to the
17. wide This instrument is manufactured in the United Kingdom The company reserves the right to change the specification or design without prior notice Megger is a registered trademark Part No MIT510_2 UG en_V06 1108 www megger com Megger Z A Du Buisson de la Couldre 23 rue Eug ne Henaff 78190 TRAPPES France T 33 0 1 30 16 08 90 F 33 0 1 34 61 23 77 E infos megger com Programma Electric AB Eldarvagen 4 Box 2970 SE 187 29 T BY Sweden T 46 8 510 195 00 F 46 8 510 195 95 Megger Pty Limited Unit 26 9 Hudson Avenue Castle Hill Sydney NSW 2125 Australia T 61 0 2 9659 2005 F 61 0 2 9659 2201 E ausales megger com Programma Electric AG Ob Haselweg 630 5727 Oberkulm Aargau Switzerland T 41 62 768 20 30 F 41 62 768 20 33 Megger Megger Limited 110 Milner Avenue Unit 1 Scarborough Ontario M1S 3R2 Canada T 1416 298 9688 Canada only T 1416 298 6770 F 1416 298 0848 E casales megger com
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