User manual MEGGER MULTIFUNCTION TESTER MFT1553

[. . . ] M MFT1500/2, MFT1552 and MFT1553 Series Multifunction Tester USER MANUAL GSAFETY s s s WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used. The circuit under test must be switched off, de-energised and isolated before test connections are made when carrying out insulation and continuity tests. Continuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified before carrying out an earth fault loop impedance test, or RCD test. Circuit connections and exposed metalwork of an installation or equipment under test must not be touched. [. . . ] t1 = 1/2I, t2 = I at 0º, t3 = I at 180º, t4 = 5I at 0º and t5 = 5I at 180º 3. 4. On completion of testing the results can be recalled by repeatedly pressing the lock button. To indicate each test result, segments of the bar graph are displayed as below: NO BARS = 1/2 I test ONE BAR = I test FIVE BARS = 5I test 4. Note:- The instrument can only test up to 1 A a. c. 0 or 180° testing 0° or 180° is selected by pressing the BLUE button on the side of the MFT on either the I or 5I RCD test. The I, and 5I RCD tests should be performed at 0° and 180° and the greater trip time recorded. AUTO RCD TEST SEQUENCE (MFT1552 AND MFT1553 ONLY) The AUTO test function will run the 1/2I, I, and 5I plus 0º and 180º tests automatically, and store the test results, while the operator stands by the RCD to reset it when it trips. Connect the RED test lead to the "Live" terminal of the RCD and GREEN and BLACK test leads to the earth conductor. Alternatively connect the mains plug test lead to a supply outlet. Example shows a 13. 9 ms trip time at 5I on 180º. RAMP TEST The RCD trip current is measured by applying a test current of half the rated trip current and increasing this every 200 ms. When the RCD trips, the current flowing is recorded and displayed in mA. Select the appropriate RCD rated current on the right hand rotary switch. If the RCD fails to trip, ">***mA" will be displayed, where *** indicates the last test current applied. for two seconds. Method of measurement The two wire lead or plug should be used for this measurement. A constant current source is connected across the supply and the time taken for the supply to trip is measured by the instrument in ms. Possible sources of error Measurement results can be affected by the following: s DC SENSITIVE RCD TESTING D. C. As with the normal RCDs, these should be tested with 0° and 180° polarity. Select the appropriate RCD rated current on the right hand rotary switch. Select the [1/2I, I, or 5I] test on the left hand range knob Use the BLUE button to cycle through the test options, selecting DC and the required polarity. If enabled, the touch voltage will be displayed on the bargraph display. If the RCD fails to trip, ">400 ms" will be displayed. Significant operating errors can occur if loads, particularly rotating machinery and capacitive loads are left connected during tests. 6. Thermal Protection The RCD circuit has thermal protection fitted to prevent overheating in the event of multiple ramp tests being performed. Allow the instrument time to cool down before continuing. T 7. TIME DELAYED (SELECTIVE) RCDS The selective RCD testing is enabled by a long press on the blue degree button. [. . . ] Pack the instrument carefully with plenty of padding, but no pressure on window or glass. 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, carriage paid, to Megger. You make track the progress of your return on line by accessing the Service/Support facilities at www. megger. com Tel: +44 (0) 1304 502 243 Fax: +44 (0) 1304 207 342 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 inservice care for your Megger products. 25 ADDITIONAL BLUETOOTH INFORMATION (ATTACHING A DONGLE) Megger MFT1553 Bluetooth Procedure This guide provides detailed methods of attaching a Bluetooth Dongle to a laptop or PC. [. . . ]