TDR 2000 english - Electrocomponents
Contents
1. Standard test probes and crocodile clips are supplied for connection to the circuit under test The test lead supplied with the LT310 LT320 and LT330 provides connection for 2 wire testing or 3 wire testing using the 3 wire red black and green lead set 6220 782 10 Application This instrument may be connected live to earth or between live conductors of systems that have a rated voltage of 300V a c rms to earth and an installation overvoltage Category or lower This means that the instrument may be connected to any fixed wiring of a building installation but not to primary supply circuits such as overhead cables To maintain user safety and ensure accurate measurements only use the test leads supplied or by Megger Limited System Diagram Where To Use Each Test all instruments all instruments LT320 LT330 High current No trip Phase Phase Loop test Loop test Loop test 2 wire 3 wire or mains 2 wire plug lead set aw OR E LED indicators Three RED led indicators show circuit connection status when correctly connected to a live circuit These are for indication purposes only and should not be relied upon as a indication of the presence of a hazardous voltage When connected to the circuit to be tested the three status LED s will show the following supply connection information LED Normal Reversed Notes indicator supply L N supp2. Mains plug test lead AS NZS 3112 AU versions USB download lead Download Manager CD Quick start guide Megger certification software PowerSuite Pro Lite 16th Order Code 6220 782 6220 740 6220 741 6220 790 25970 041 6111 442 5174 188 23 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 3 YEARS FROM THE DATE OF PURCHASE BY THE USER Note Any unauthorized prior repair or adjustment will automatically invalidate the Warranty INSTRUMENT 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 or an approved repair company UKrepairs megger com Returning and Instrument for Repair If it is necessary to retun an instrument for repair a Returns A
3. Temperature and humidity Operating range 5 C to 40 C Operating humidity 93 R H at 40 C max Storage range 25 C to 70 C Maximum altitude 2000 m Environmental protection Weather proof to IP54 Safety Meets the requirements of EN61010 1 Cat 300 V phase to earth IEC61557 Complies with the following parts of EN61557 Electrical safety in low voltage systems up to 1000 V ac and 1500 V d c Equipment for testing measuring or monitoring of protective measures Part1 General Requirements Part3 Loop resistance Power supply Battery 8 x 1 5 V cells IEC LR6 type AA alkaline Rechargeable NiCAD or NiMH cells may be used Battery condition is constantly shown on the display as a four section bar graph with 2 bars per section Battery life 2000 consecutive tests on any test using quality batteries Weight All units 980gms 21 Dimensions All units 203 x 148 x 78 mm E M C In accordance with IEC61326 including amendment No 1 22 BASIC AND SERVICE ERRORS Basic and service errors Loop test ranges The basic error is the maximum inaccuracy of the instrument under ideal conditions whereas the service error is the maximum inaccuracy taking into effect of battery voltage temperature interference and system voltage and frequency where applicable ACCESSORIES Item 3 wire test lead set and crocodile clips Mains plug test lead BS 1363 BS Versions Mains plug test lead CEE 7 7 EN versions
4. com Megger products are distributed in 146 countries worldwide 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 LT300_UG_en_V03 1005 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 infos megger com 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 Megger Megger Limited 110 Milner Avenue Unit 1 Scarborough Ontario M1S 3R2 Canada T 1 416 298 9688 Canada only T 1 416 298 6770 F 1 416 298 0848 E casales megger com
5. ring circuit or any series of loop measurements can be derived by using the maxZ function To make a maxZ measurement 1 Select the maxZ test range 2 Using either the No Trip or Hi loop tests make a series of loop test measurements as described on pages 11 and 12 3 The display will hold the highest loop measurement from any number of loop tests Lower values are displayed momentarily 4 Turning the range knob away from maxZ removes the maxZ stored value NOTE maxZ is not stored when the instrument is switched off or auto powers off hence auto power off time is extended in the Zref and R1 R2 modes to 30 minutes from the standard 6 minutes Deriving R1 R2 17320 and LT330 Automatic Derivation of R1 R2 Values The LT320 is able to derive the R1 R2 measurement reading from tests made on a live installation NOTE Care should be taken as any parallel earth paths may effect this result To make use of this feature the reference distribution board result must be stored in the instrument s memory Zref prior to measuring 1 R2 14 Saving a Zref distribution result 1 Switch the range knob to Zref 2 Select a No Trip or Hi loop test as appropriate 3 Connect the instrument to the circuit under test as described on pages 11 or 12 as required 4 Press the TEST button to perform a loop test IMPORTANT NOTES When using Zref and R1 R2 functions we DO NOT recommend changing betwee
6. the instrument is connected to a voltage The test lock remains on for 30 seconds after which it resets to off Test inhibit The following conditions may cause the instrument to inhibit testing Out of range supply voltage If an out of range voltage or frequency exists on the circuit under test or on very noisy mains supply testing will be automatically inhibited Overheating Repetitive loop testing generates heat within the instrument If this heat becomes excessive the instrument will warn the operator and prevent further testing until the instrument has had a chance to cool down Fuse Blown A fuse blown will prevent the instrument from making further tests The fuse indicator will be displayed Default voltmeter The default voltmeter automatically operates in all test modes indicating connection to a live system Auto power down To extend battery life the instrument will automatically switch off six minutes after the last operation The instrument can be switched off manually by selecting OFF with the rotary switch or switched back on again by pressing the TEST button Backlight operation LT320 and LT330 The LT320 and LT330 LCD display may be backlit to allow readings to be seen in adverse lighting conditions The backlight function can be selected at any time while the instrument is switched on by pressing the BACKLIGHT button The backlight function will switch off automatically 15 seconds after the in
7. 1 02 etc using keys then press NEXT 4 Select circuit number 01 02 etc using keys then press NEXT 5 Select L L L E L N etc by pressing the keys then press NEXT 6 Select the Phase using keys then press NEXT The screen will display a unique test number which is attached to that particular test 7 Press OK to save the result To store a subsequent result To save the next test under the same location job number distribution board etc 1 Make another measurement as described earlier and press STORE 2 The last Job number will be displayed Press OK 3 The unique test number will be displayed Press OK and the result is stored Note To change any setting before saving a result scroll down through the result using the NEXT LAST keys Change the reference number using the keys and press OK To recall the last test result 1 Set the range knob to RCL 2 The last unique test number is displayed 3 Press OK and the test result will be displayed Note Only the last test result can be recalled to the display To recall the PFC value press LAST or NEXT value if applicable 17 Downloading results to a 1 Run Megger Powersuite Professional or Megger Download Manager on the PC 2 Select the appropriate downloading instrument from the list 3 Select Download from Tester 4 Connect the tester to the PC using the USB test lead 5 Set the tester range knob to Snd 6 The test data w
8. If the message hot appears in the display together with the to cool down before further attempts are made at loop testing symbol when loop testing the instrument must be allowed Possible sources of error The reading depends on a measurement of the supply voltage and therefore noise or transients caused by other equipment during the test could cause an error in the reading One way to check for these is to do two tests and look for any difference in value The instrument will detect some sources of noise and warn the user where other instruments may give an incorrect reading Any leakage current as a consequence of other appliances connected to the supply under test may affect the reading If the Phase Earth loop is being measured this leakage may be due to filter capacitors etc Test results may be adversely affected by supply voltage fluctuations or electrical noise during a measurement It is recommended that tests are repeated and the results verified if measurement results are considered abnormal Errors can be reduced by m Use the 2 wire lead set with prods and making a firm connection to clean conductors 13 m Make several tests and taking the average Ensure that potential sources of noise in the installation are isolated switched off eg automatically switched loads or motor controllers m Ensuring that the instrument is calibrated maxZ LT320 and LT330 The maximum loop impedance value of any final
9. Megger LT300 Series Earth Loop Testers USER MANUAL A SAFETY WARNINGS m Safety Warnings and Precautions must be read and understood before the instrument is used They must be observed during use m Continuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified before carrying out an earth fault loop impedance or RCD tests Do not leave the instrument connected to the mains supply when not in use m Circuit connections and exposed metalwork of an installation or equipment under test must not be touched Ensure that hands remain behind guards of probes clips when testing m The instrument should not be used if any part of it is damaged Test leads probes and crocodile clips must be in good order clean and with no broken or cracked insulation National Safety Authorities may recommend the use of fused test leads when measuring voltage on high energy systems m The battery cover must be in place whilst conducting tests m Voltage indicator LED s cannot reveal a N PE supply reversal m When making a 2 wire measurement with the 3 wire lead set for safety reasons the balck test lead should be connected together with the green test lead NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and or their employers are reminded that Health and Safety Legislation requires them to carry out valid risk assessments of all
10. NICAL SPECIFICATION General Specification Only values with tolerances or limits are guaranteed data Values without tolerances are for information only Voltage measurement Range 0 V to 500 V Accuracy 2 2 digits Frequency measurement LT320 and LT330 Range 25Hz to 450Hz Accuracy 25 0Hz to 199 9Hz 0 1Hz 200Hz to 450Hz 1Hz Phase rotation indicator LT320 and LT330 Three wire identification of phase rotation Loop ranges to EN 61557 3 3 wire No Trip Loop Line to Earth Supply LT310 100 V 280 V 45Hz to 65Hz LT320 17330 50 V 280 V 45Hz to 65Hz Nominal test current 15mA line to earth Loop accuracy 0 01 Q 9 99 Q 5 0 03 Q 10 0 Q 99 9 Q 5 0 5 Q 100 Q 999 Q 5 5 Q 1 00 kQ 2 00kQ 5 30 Q 2 wire HI loop test Line Line Three phase LT320 and LT330 Supply 50 V 480 V 45Hz to 65Hz Nominal test current 0 25 to 2 4 A Loop accuracy 0 01 Q 99 99 Q 45 0 03 Line Earth Single phase Supply 11310 100 280 LT320 LT330 50 V 280 V Frequency 45Hz to 65Hz Nominal test current 15 mA to 14 Loop accuracy 0 01 Q 9 99 Q lt 5 0 03 10 0 Q 99 9 Q 45 0 5 100 Q 999 Q 45 5 Q 1 00 kQ 2 00kQ 5 30 Q Prospective fault current PFC Prospective fault current Nominal Voltage Loop resistance Accuracy is derived from loop test 1A 199A 1 A resolution 0 20 kA 19 9 kA 10 A resolution 2 0 kA 19 9 kA 100 A resolution
11. ates the greatest voltage on the system Phase to earth voltage measurement Note measured voltage must not exceed 300 V phase to earth To measure the voltage of the electrical supply 1 Set the instrument to the V range 2 Connect the GREEN or 10 lead to the protective earth PE and the RED or 11 lead to the phase to be measured 3 The instrument will display the phase to earth voltage Phase to Phase voltage measurement LT320 and LT330 NOTE measured voltage must not exceed 300 V phase to earth To measure the voltage of the electrical supply 1 Set the instrument to the V range 2 Connect the GREEN or L0 L2 lead to the first phase and the RED or 11 lead to the second phase 3 The instrument will display the Phase to Phase voltage 15 FREQUENCY HZ LT320 and LT330 To measure the frequency of the electrical supply 1 Set the instrument to the Hz range 2 Connect the GREEN or L0 lead to the protective Earth PE and the RED or L1 lead to the phase to be measured 3 The instrument will display the frequency in Hz 16 PHASE SEQUENCE LT320 and LT330 When connected to all conductors of a three phase system the instrument automatically displays the sequence of phase rotation To determine phase sequence m Connect the Installation Testers as follows Line 1 Red lead to Red phase Line 2 Green lead to Yellow phase Line 3 Black lead to Blue phase The symbol is displ
12. atteries 18 Fuse blown indication 19 Auto power down 19 Preventive maintenance 20 Technical specification 20 Basic and service errors 22 Accessories and equipment 23 Repair and Warranty 24 Symbols used on the instrument are A Caution refer to accompanying notes 5 Equipment protected throughout by Double Insulation Class Equipment complies with current EU directives N13117 C Equipment complies with C tick requirements INTRODUCTION Thank you for purchasing the Megger Earth Loop Impedance Tester For your own safety and to get the maximum benefit from your instrument please ensure that you read and understand the following safety warnings and instructions before attempting to use the instruments This user manual describes the operation and functions of the following LT300 series of Loop Impedance Testers 1T310 1T320 11330 GENERAL DESCRIPTION The LT300 series test instruments have the following features Feature 1T310 1T320 3 Phase safe Large clear display Backlight Battery status indication Auto power down Fuse blown indication L N E polarity indicators Voltmeter range 500V Frequency measurement Phase rotation indicator Reverse polarity operation some models only Locking test button 3 wire no trip loop test 2 wire high loop test Phase Phase loop test PFC display LT330 CASE CONTENTS Feature Please complete the warranty card and return it to Megger a
13. ayed will show the phase sequence O indicates R B Y sequence or 1 2 3 O indicates R Y B sequence or 1 3 2 NOTE If one of the lines is faulty neither of the symbols is displayed and just the normal neon polarity indication is shown TEST RESULT STORAGE LT330 ONLY Storing LOOP test results Results storage has the following structure gt 000 P 001 255 Job number b00 b01 b02 99 Distribution board No c00 c01 c02 99 Circuit number R12 RrN Rr2 Rr1 R1 amp R2 Circuit type P1 to P3 Phase 000 OOl iss job number acts as work folders Sets of results can be saved to a particular job number and easily separated when downloaded b01 b02 distribution board number c01 c02 circuit reference Results can be assigned a specific distribution board number and circuit reference number L E L N circuit type allows a test to be defined as the circuit type P1 P2 P3 Phase number Each test can be stored under a particular phase P1 P2 or P3 Unique test number Each test result is assigned a unique test number from 0 to 1999 logged automatically This cannot be changed by the user To store a result 1 Make a Z MaxZ Zref or R1 R2 loop measurement as descried earlier and Press STORE 2 Select Job reference number using keys then press NEXT Hold the key down to scroll quickly through the numbers 3 Select distribution board number b0
14. electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits Some national safety authorities recommend fused leads for voltage measurement on high energy systems If RCD or Loop tests are made it may cause the fuse to rupture and so they must be used with caution on voltage testing CONTENTS Safety warnings Introduction General description Case contents LCD display Front panel Connection panel Lid open closure Preparations for use Batteries Preliminary test lead check General operating instructions Display warning symbols Setup procedure Reverse polarity or line neutral swapping Test leads Test lead connection LED indicators Loop testing Non tripping loop test No Trip Hi current loop test Phase Earth loop impedance not at a power socket Phase Neutral or Phase Phase loop impedance Prospective fault current display PFC Error messages Possible sources of error maxZ LT320 only Deriving 1 R2 LT320 and LT330 Voltage measurement Phase to earth voltage measurement Phase to Phase voltage measurement LT320 and LT330 OOM AAN WN KR Ww vUN A BR WO MN NYFF Frequency Hz LT320 and LT330 16 Phase sequence LT320 and LT330 16 Test result storage LT330 only 17 Replacing batteries and fuses 18 Low battery warning symbol 18 To replace b
15. ill automatically download its contents to the PC A bar graph shows the status of the download Deleting test results To delete the latest test result 1 Set the range knob to dEL The display will flash dEL followed by the test number to be deleted 2 Press the OK button The last test result will be will be deleted WARNING This operation is not reversible To delete all test data 1 Set the range knob to dEL The display will flash AEL 2 Press the NEXT or LAST key The display will flash ALL 3 Press the OK button All the test results will be will be deleted A bar graph shows the progress of the deletion WARNING This operation is not reversible All data will be deleted 18 REPLACING BATTERIES Batteries Battery type 8 x LR6 AA 1 5 V Alkaline or 8 x 1 2V NiCAD or 8 x 1 2V NiMH Low battery warning symbol The battery condition is continuously displayed by the symbol When the batteries are exhausted symbol will show L and the isntrument switches off Batteries should be replaced when 2 bars are displayed If the symbol appears as less than fully charged with new batteries fitted check for correct polarity Note Fully charged NiMH or NiCAD rechargeable batteries show a lower charge than Alkaline batteries and may not give much warning before becoming exhausted To replace batteries Warning Do not switch the instrument on with the battery cover removed Switch off
16. ly A on Q L PE Voltage between L PE L N greater than 25 Voltage between L N greater than 25 Voltage between N PE greater than 25 Warning Voltage indicator LED s cannot reveal a N PE supply reversal Polarity indication If connected to a single phase power supply by a plug or by the 3 wire lead set three LED s marked L PE N PE and L N will indicate supply polarity Note The presence of a voltage between phase and earth does not prove earth continuity as the earth could have a high resistance and a voltage would still be measured To test earth continuity refers to the sections on loop testing LOOP TESTING Two loop testing options are available No Trip and Hi Non tripping loop test No Trip Earth loop impedance measurement at a power socket The No Trip range is a high resolution 0 01 Q low test current earth loop resistance measurement range It requires a connection to neutral but allows quick and accurate measurement of the earth loop resistance without tripping all RCDs with a rated current 30 mA or higher To perform a No Trip loop test Range selection 1 Select the No Trip test range A non trip loop test is confirmed on the display with the e symbol 2 On the LT320 LT330 set the top rotary knob to Z Testing 1 Connect the mains plug test lead to the instrument 2 Insert the plug into an installation socket 3 Sup
17. n No Irip or Hi test ranges during the test Always use the same test method whilst using Zref and R1 R2 Showing R1 R2 1 After saving a Zref result switch the instrument to R1 R2 2 All subsequent loop test measurements will have the Zref distribution resistance subtracted 3 The Zref value can be updated at any time by returning the Range knob to Zref and repeating the loop test NOTE Zref is not stored when the instrument is switched off or auto powers down hence auto power off time is extended in the Z ref and R1 R2 modes to 30 minutes from the standard 6 minutes Application note for Zref and R1 R2 measurement On initial verification of a new electrical installation the value for R1 R2 should be obtained by continuity testing methods dead testing as per BS 7671 2001 For periodic inspection reports PIR where it is not possible to isolate the supply the user should first verify the circuit protective conductor standard practice prior to using the Zref and R1 R2 function on the Megger LT320 or LT330 Prior to measuring Zref all main equipotential bonding must be in place Note Measurements made on live installations by this method may be lower than the Ze R1 R2 from those obtained by continuity testing methods due the existence of parallel earth return paths from extraneous conductive parts VOLTAGE MEASUREMENT When connected to a system using the three wire lead set or mains plug the instrument indic
18. n held down until the instrument displays the SET warning Now release the TEST button Press the TEST button again to view the current setting for line neutral swapping The display shows L L instrument will perform tests with L amp N swapped L N instrument will not perform tests with L amp N swapped Press the LOCK button or the PFC button to change the setting Press the TEST button to exit from the set up menu Test leads All test leads form part of the measuring circuit of the instrument and must not be modified or changed in any way or be used with any other electrical instrument or appliance The mains plug test lead supplied with the Megger tester is a test lead that forms part of the measuring circuit of the instrument The overall length of this lead must not be altered If the power cord plug is not suitable for your type of socket outlets do not use an adapter You may change the plug once only by cutting the cord as close to the plug as possible and fitting a suitable plug The colour code of the cord is Earth Ground Neutral Blue Phase Line Yellow Green Brown Note A plug severed from the power cord must be destroyed as a plug with bare conductors is hazardous in a live socket outlet Test lead connection The supplied test leads should be connected to the appropriate sockets on the rear of the instrument marked LO and L1 or to the 3 way test socket
19. nection only 17310 LOOP TESTER _ S gt A ae MAX 500V LT330 additional controls Last Stored Test result data result recall download delete Memory control keys BLUE Memory control keys STORE Store initiates the storing of a test result LAST NEXT Selects the type of location ie job distribution board circuit phase etc ESC Aborts a save at any time OK Final operation to save the result A Selects the job db circuit number ie 01 02 03 etc Lid open closure 1 Open lid by lifting up front panel tab 1 2 Fold away underneath instrument 2 amp 3 and push into retaining slot 4 PREPARATIONS FOR USE ALL INSTRUMENTS Batteries The Megger LT300 series instruments are supplied with batteries fitted When batteries become exhausted refer to page 18 battery replacement Warning Do not switch the instrument on with the battery cover removed Preliminary test lead check Functional verification Before each use of the instrument visually inspect the test leads prods and crocodile clips to confirm that their condition is good with no damaged or broken insulation GENERAL OPERATING INSTRUCTIONS Tests lock The LOCK 4 indicates when the Hi current loop test range is locked ON It is activated by holding down the T lock button and pressing the TEST button When activated the Hi current loop resistance measurement will start when
20. ply voltage is displayed 4 Press the TEST key 5 After a test period of up to 20 seconds the measured loop value is displayed If desired the test can be repeated by pressing TEST again Using the three wire lead set The No Trip loop test can be carried out where a power socket is not available using the three wire lead set 1 Connect the RED lead to Phase BLACK lead to neutral and GREEN lead to earth 11 2 Supply voltage is displayed 3 Press the TEST key 4 After a test period of up to 20 seconds the measured loop value is displayed Hi current loop test Hi The Hi Loop test performs a 2 wire loop test provides a rapid loop test designed for non RCD protected circuits NOTE During all Hi tests the BLACK neutral test lead does not need to be connected but for safety reasons Megger recommend it is connected to the same connection point as the GREEN earth test lead Range selection 1 Set the instrument to the Hi loop test range A Hi current loop test is confirmed on the display with the symbol L which indicates the possibility of tripping an RCD if fitted 2 On the LT320 and LT330 set the top range knob to Z Phase Earth loop impedance not at a power socket Testing 1 Connect the Red Green lead set or the 3 wire test lead to the instrument 2 Connect the RED L1 lead to PHASE and the GREEN L0 lead to EARTH black lead connect the black lead to the green lead 3 The su
21. pply voltage is displayed 4 Press the TEST button to start a loop test 5 After a short delay the measured loop value is displayed If desired the test can be repeated by pressing the TEST button 12 Bonded metalwork testing Repeat the above test but with the green lead connected to the exposed metalwork For a Hi current phase to earth loop impedance measurement at a power socket repeat the above test using the mains plug test lead supplied Phase Neutral or Phase Phase loop impedance 1 Connect the Red Green lead set or the 3 wire test lead to the instrument Connect the RED L1 lead to PHASE Connect the GREEN 10 lead and the BLACK lead black lead ensure the black lead is connected to the green lead to NEUTRAL or the 2nd PHASE for Phase to Phase loop measurement N 3 The supply voltage is displayed Press the TEST button to start a loop test After a short delay the measured loop value is displayed If desired the test can be repeated by pressing the TEST button again NOTE Phase Phase 415 V loop test is only possible on the LT320 Prospective fault current display PFC 1 On completion of a test press the PFC key 2 The prospective fault current is displayed in Amps or kA NOTES The prospective short circuit current PSCC of a circuit is the largest prospective fault current PFC In a single phase system this would be the larger of the earth loop PFC and the neu
22. s soon as _ possible to help us reduce any delays in supporting you should the need Max Zs display arise ea Carton contents LT310 LT320 and LT330 Plug ended test lead 1 x LT300 series loop tester 3 wire ended test lead 1 x 3 wire test lead with prods with clips roc cli 1 prope See endes 1 Plug ended test lead Calibration certificate 8 x AA LR batteries fitted in instrument IEC61010 1 300V 1 x Warranty card EN61557 1 x Certificate of test Test result storage 1 x Calibration certificate USB download 1 x CD containing user manual 1 x Quick start guide L lt 3 Download Manager CD LT330 only LCD DISPLAY RCD Trip Refer to Indicator Fuse Blown Testlock User manual Noise 40 Battery status gt Ranges Phase Rotation Measured results FRONT PANEL Supply connection indicators L PE L N N PE L Test lead connections Loop test function 2 MaxZ R1 R2 Zref LCD Display Test Lock Neck strap Test button Hi PFC display ae key On Off Hz LT320 330 LT320 330 Phase rotation LT320 330 LT300 Series test lead connections LT320 and LT320 Mains plug test Single or 3 phase Neutral or 2nd lead phase connection LT320 USB LOOP connection TESTER 11330 only 585 Maximum 300 V phase Maximum 500 V across Maximum 300 V phase to earth allowed terminals to earth allowed LT310 Single phase con
23. strument has finished testing Display warning symbols A Refer to user manual Any time the warning triangle is displayed the operator should refer to the user manual for further information Range lock Displayed at any time the TEST button is locked in the on position Battery condition indication Refer to page 18 Fuse blown indicator appears when an instrument fuse has failed Refer to page 17 gt 280V Displayed on the LT310 indicates a supply voltage in excess of that allowed is present gt 480V Displayed on the LT320 indicates a supply voltage in excess of that allowed is present hot Indicates the instrument needs to cool down before it can continue loop testing Noise on the circuit under test may affect the reading Setup procedure Reverse polarity or line neutral swapping This feature is only available on the following models LT310 EN SC LT320 EN SC LT310 FR SC LT320 FR SC LT310 DE SC LT320 DE SC LT310 ES SC LT320 ES SC LT310 IT SC LT320 IT SC LT310 NL SC LT320 NL SC LT310 NO SC LT320 NO SC The set up menu allows the user to change the way the instrument behaves when testing on a supply with Line and Neutral connections swapped Tests may be permitted or prohibited To select Polarity reversal acceptance or rejection 1 N A With the instrument switched OFF hold down the TEST button and turn the range knob to any ON position Keep the butto
24. the instrument and disconnect the instrument from any electrical circuits 2 The rear cover must not be opened if the test leads are connected 3 To remove the rear cover release the screw at the bottom of the cover and lift the cover upwards 4 Fit new batteries observing the correct polarity as marked on the battery compartment 5 Replace the cover WARNING Incorrect battery cell polarity cause electrolyte leakage resulting in damage to the instrument Check that the battery level indicator displays a full charge before using the instrument A low battery charge may indicate a reversed cell Note Battery cells should not be left in an instrument which may remain unused for extended periods of time Fuse Blown indication The fuse blown symbol instrument is fitted with a factory fitted fuse and should only be replaced by indicates that an internal fuse has failed This an authorised Megger repair centre AUTO POWER DOWN To extend battery life the instrument will automatically switch off six minutes after the last operation This is extended to 30 minutes when using the Zref R1 R2 or maxZ features The instrument can be switched off manually by selecting OFF with the rotary switch or switched back on again by pressing the TEST button 19 PREVENTIVE MAINTENANCE Clean only with a damp cloth Do not use any alcohol based cleaning fluids as they may leave a residue 20 TECH
25. tral loop PFC In a multi phase system phase phase loops also need to be considered and these can be measured using the Hi switch position The is calculated by using the sum Nominal supply voltage PFC Loop resistance The supply voltage used in the calculation depends on the measured voltage The instrument uses the following voltage values Actual measured Nominal voltage voltage gt 50 Vand lt 80 V 50 V gt 80 V and lt 150 V 110 V gt 150 V and lt 300 V 230 V gt 300 V 400 V LT320 amp LT330 only PFC measurement accuracy An accurate PFC measurement requires an accurate measurement of the loop resistance The difference of a few digits in the loop resistance measured will have a large effect on the PFC displayed Warning messages Noise Indication A The symbol A is displayed when excessive noise caused by other equipment exists on the circuit under test This noise can affect the accuracy of the loop measurement The operator is advised to repeat the measurement or if the noise symbol continually appears investigate the cause Voltages greater than 280V gt 480V LT320 and LT330 LT310 Ifa voltage greater than 280 V is detected the display will show gt 280 V IT320 LT330 Ifa voltage greater than 480 V is detected between phases the display will show gt 480 V Over temperature hot To protect the instrument from over heating during Loop testing thermal protection is fitted
26. uthorisation number must first be obtained by contacting one of the addresses shown You will be asked to provide key information such as the instrument serial number and fault reported when the number is issued This will enable the Service Department to prepare in advance for the receipt of your instrument and to provide the best possible service to you The Returns Authorisation number should be clearly marked on the outside of the product packaging and on any related correspondence The instrument should be sent freight paid to the appropriate address If appropriate a copies of the original purchase invoice and of the packing note should be sent simultaneously by airmail to expedite clearance through customs For instruments requiring repair outside the warranty period a repair estimate will be submitted to the sender if required before work on the instrument commences Approved Repair Companies A number of independent instrument repair companies have been authorised for repair work on most Megger instruments using genuine Megger spare parts A list of approved companies is available from the UK address shown on this page Spare parts are also available 24 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 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
Download Pdf Manuals
Related Search