Table of Contents
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Table of Contents
Related Manuals for Megger LT310
Summary of Contents for Megger LT310
- Page 1 LT300 Series Earth Loop Testers USER MANUAL...
- Page 2 SAFETY WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use. 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.
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Page 3: Table Of Contents
CONTENTS Safety warnings Frequency Hz (LT320 and LT330) Introduction Phase sequence (LT320 and LT330) General description Test result storage (LT330 only) Case contents Replacing batteries and fuses LCD display Low battery warning symbol Front panel To replace batteries Connection panel Fuse blown indication Lid open/closure Auto power down... -
Page 4: Introduction
INTRODUCTION GENERAL DESCRIPTION Thank you for purchasing the Megger Earth Loop Impedance Tester. The LT300 series test instruments have the following features For your own safety and to get the maximum benefit from your instrument, please ensure that you read and understand the following... -
Page 5: Case Contents
CASE CONTENTS Feature LT310 LT320 LT330 Please complete the warranty card and return it to Megger as soon as possible to help us reduce any delays in supporting you should the need Max Zs display arise. R1+R2/ZRef switch Carton contents LT310, LT320 and LT330... -
Page 6: Lcd Display
LCD DISPLAY FRONT PANEL... -
Page 7: Connection Panel
Lid open/closure 1. Open lid by lifting up front panel tab (1). LT310 Single phase connection only 2. Fold-away underneath instrument (2 & 3) and push into retaining slot (4). LT330 additional controls... -
Page 8: Preparations For Use
Tests lock The LOCK indicates when the [Hi] current loop test range is locked The Megger LT300 series instruments are supplied with batteries fitted. When batteries become exhausted, refer to page 18, battery replacement. It is activated by holding down the... -
Page 9: Display Warning Symbols
4. Press the [TEST] button again to view the current setting for Refer to page 17. line/neutral swapping. >280V Displayed on the LT310 indicates a supply voltage in excess of that 5. The display shows ‘L+L’ (instrument will perform tests with L & N allowed is present. -
Page 10: Test Leads
(overvoltage) Category III or lower. The mains plug test lead supplied with the Megger tester is a test lead that This means that the instrument may be connected to any fixed wiring of a forms part of the measuring circuit of the instrument. The overall length of building installation, but not to primary supply circuits such as overhead this lead must not be altered. -
Page 11: Loop Testing
LOOP TESTING When connected to the circuit to be tested the three status LED’s will Two loop testing options are available: [No Trip] and [Hi]. show the following supply connection information: Non-tripping loop test [No Trip] Normal Reversed Notes Earth loop impedance measurement (at a power socket): Ω... -
Page 12: Phase-Earth Loop Impedance (Not At A Power Socket)
NOTE: During all [Hi] tests the BLACK neutral test lead does not need to 2. Connect the RED [L1] lead to PHASE. Connect the GREEN [L0] lead and be connected, but for safety reasons Megger recommend it is connected the BLACK lead (black lead - ensure the black lead is connected to the to the same connection point as the GREEN earth test lead. -
Page 13: Possible Sources Of Error
The PFC is calculated by using the sum:- Voltages greater than 280V [>480V on LT320 and LT330] Nominal supply voltage If a voltage greater than 280 V is detected, the display will LT310: PFC= show >280 V . Loop resistance... -
Page 14: Maxz (Lt320 Only)
(standard practice) prior to using the Zref and R1+R2 function on the To make use of this feature, the reference/distribution board result must Megger LT320 or LT330. be stored in the instrument’s memory (Zref), prior to measuring R1 + R2... -
Page 15: Voltage Measurement
VOLTAGE MEASUREMENT Prior to measuring Zref, all main equipotential bonding must be in place. When connected to a system using the three wire lead set or mains plug the instrument indicates the greatest voltage on the system. Note: Measurements made on live installations by this method may be lower than the Ze + (R1+R2) from those obtained by continuity testing Phase to earth voltage measurement methods, due the existence of parallel earth return paths from extraneous... -
Page 16: Frequency Hz (Lt320 And Lt330)
FREQUENCY HZ (LT320 and LT330) PHASE SEQUENCE (LT320 and LT330) To measure the frequency of the electrical supply: When connected to all conductors of a three phase system, the instrument automatically displays the sequence of phase rotation. 1. Set the instrument to the [Hz] range. To determine phase sequence 2. -
Page 17: Test Result Storage (Lt330 Only)
TEST RESULT STORAGE (LT330 ONLY) Storing LOOP test results: (Hold the key down to scroll quickly through the numbers) 3. Select distribution board number (b01,02 etc) using ↑↓ keys Results storage has the following structure: then press NEXT 4. Select circuit number (c01,02 etc) using ↑↓ keys then press NEXT 000, 001…255 = Job number... -
Page 18: Replacing Batteries And Fuses
REPLACING BATTERIES Batteries Downloading results to a PC: 1. Run Megger Powersuite Professional or Megger Download Manager on Battery type: 8 x LR6 (AA), 1.5 V Alkaline, or 8 x 1.2V NiCAD, or 8 x 1.2V the PC NiMH 2. Select the appropriate downloading instrument from the list Low battery warning symbol 3. -
Page 19: Fuse Blown Indication
Fuse Blown indication The fuse blown symbol indicates that an internal fuse has failed. This instrument is fitted with a factory fitted fuse and should only be replaced by an authorised Megger repair centre. -
Page 20: Preventive Maintenance
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 and LT330) 50 V - 280 V 45Hz to 65Hz Nominal test current: 15mA line to earth Loop accuracy Ω... - Page 21 Maximum altitude: Line/Earth (Single phase) Supply: Environmental protection: Weather proof to IP54 100 V - 280 V Safety LT310 50 V - 280 V LT320/LT330 Meets the requirements of EN61010-1 Cat III 300 V phase to earth. 45Hz to 65Hz IEC61557...
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Page 22: Basic And Service Errors
BASIC AND SERVICE ERRORS Dimensions Basic and service errors Loop test ranges All units: 203 x 148 x 78 mm The basic error is the maximum inaccuracy of the instrument under ideal conditions, whereas the service error is the maximum inaccuracy taking into E.M.C effect of battery voltage, temperature, interference, and system voltage and In accordance with IEC61326 including amendment No.1... -
Page 23: Accessories And Equipment
Mains plug test lead (BS 1363) (BS Versions) 6220-740 Mains plug test lead CEE 7/7 (EN versions) 6220-741 Mains plug test lead (AS/NZS 3112) (AU versions) 6220-790 USB download lead 25970-041 Download Manager CD 6111-442 Quick start guide 5174-188 Megger certification software PowerSuite Pro-Lite 16th... -
Page 24: Repair And Warranty
Megger instruments, using genuine Kent CT17 9EN Norristown PA 19403 Megger spare parts. A list of approved companies is available from the UK England. U.S.A. address shown on this page. Spare parts are also available. - Page 25 E ausales@megger.com F +1 416 298 0848 E casales@megger.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.
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