Sonel MZC-304 User Manual
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Sonel MZC-304 User Manual

Fault loop impedance meter
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Summary of Contents for Sonel MZC-304

  • Page 3 USER MANUAL FAULT LOOP IMPEDANCE METER MZC-304 SONEL S.A. Wokulskiego 11 58-100 Świdnica Version 2.04 03.04.2019...

  • Page 4: Table Of Contents

    Additional uncertainty according to IEC 61557-3 (Z) ............33 Additional uncertainty according to IEC 61557-4 (R ±200 mA) ........33 9.2.2 10 Equipment ........................34 10.1 Standard equipment ....................34 10.2 Optional accessories ....................34 11 Manufacturer ......................35 12 Laboratory services ....................36 MZC-304 – USER MANUAL...

  • Page 5: Safety

    Safety The MZC-304 meter is designed for testing the protection against electric shock in the mains sys- tems. The meter is used to make measurements which results determine the electrical installation safety level. Consequently, in order to ensure safe operation and correct measurement results, ob- serve the following recommendations: ...

  • Page 6: Measurements

    Use the buttons to change the parameter value. The value or symbol to be changed is flashing. symbol indicates an active parameter, - symbol indicates an inactive one. MZC-304 – USER MANUAL...

  • Page 7: Remembering The Last Measurement Result

    The meter measures and displays alternating mains voltage in all measuring functions except R. This voltage is measured for the frequencies within the range of 45..65 Hz. The test leads should be connected as for a given measuring function. MZC-304 – USER MANUAL...

  • Page 8: Measurement Of Voltage And Frequency

    - The person making a measurement must ensure that he/she is standing on a non-insulated floor during the measurement; otherwise the result of the measurement may be incorrect. - The threshold value, which triggers the signal of exceeded allowable voltage on PE conduit, is ap- proximately 50 V. MZC-304 – USER MANUAL...

  • Page 9: Measurement Of Fault Loop Parameters

    Note: Using cables from known manufacturers and selecting the correct length guarantees the declared measurement accuracy. MZC-304 – USER MANUAL...

  • Page 10: Prospective Short-Circuit Current

    2.7.3 Measurement of fault loop parameters in the L-N and L-L circuits Turn on the meter. Turn the rotary switch to the Z position. Depending on needs, select cable length according to section 2.7.1. MZC-304 – USER MANUAL...
  • Page 11 U voltage Make the measurement by pressing the START button. Read the main meas- urement result: fault loop impedance Z the mains voltage at the time of measurement. To read additional results, press the button. MZC-304 – USER MANUAL...
  • Page 12 As a result of this, the enclosure of the device may become hot. This is normal and the meter is equipped with the protection against excessive temperature. - Minimum interval between successive measurements is 5 seconds. This is controlled by the meter which displays the message informing that the measurement can be made. MZC-304 – USER MANUAL...

  • Page 13: Measurement Of Fault Loop Parameters In The L-Pe Circuit

    2.7.4 Measurement of fault loop parameters in the L-PE circuit Turn on the meter. Turn the rotary switch to the Z position. L-PE Depending on needs, select cable length according to section 2.7.1. Connect the test leads according to one of the drawings. MZC-304 – USER MANUAL...
  • Page 14 Double lead measurement is possible when a test lead other that the lead with a mains socket is se- lected. Additional information displayed by the meter Error messages and information - as for the L-N and L-L measurement. MZC-304 – USER MANUAL...

  • Page 15: Measurement Of Short Circuit Loop Impedance In L-Pe Circuit Protected By A Residual Current Device (Rcd)

    2.7.5 Measurement of short circuit loop impedance in L-PE circuit protected by a residual current device (RCD) The MZC-304 enables the fault loop impedance measurements without altering the mains pro- tected by RCD's with the rated current of at least 30mA.

  • Page 16: Measurement Of Resistance To Earth

    However, if such error does not exceed a limit value for the tested earthing system, it can be concluded that the earthing has been made correctly and and there is no need for a more accurate measurement methods. MZC-304 – USER MANUAL...

  • Page 17: Low-Voltage Resistance Measurement

    Activate the measurement by pressing the START button. The measurement starts automatically for resistances lower than 30 Read the measurement result which is the arithme- tic mean of two measure- ments with 200mA current flowing in opposite direc- tions. MZC-304 – USER MANUAL...

  • Page 18: Low-Current Measurement Of Resistance

    Measuring range is exceeded. 2.9.2 Low-current measurement of resistance Turn on the meter. Turn the rotary switch to the R position. The meter is ready for measurement. Connect test leads according to the draw- ing. Read the measurement result. MZC-304 – USER MANUAL...

  • Page 19: Compensation Of Test Leads Resistance - Autozeroing

    Set the autozeroing according to the following algorithm. Short the test leads. Activate the autozeriong by pressing the START button. After completion of auto- zeroing, the meter auto- matically switches to the "ready for measurement" mode. MZC-304 – USER MANUAL...

  • Page 20: Memory Of Measurement Result Data

    (both conductors)! Memory of measurement result data MZC-304 meters are equipped with the memory that can store 10000 single measurement re- sults. The whole memory is divided into 10 memory banks, each of them containing 99 memory cells. Thanks to dynamic memory allocation, each of the memory cells can contain different quantity of sin- gle measurement results, depending on the needs.

  • Page 21: Storing The Measurement Result Data In The Memory

    The cell contains the measurement results of the displayed types. The cell contains the measurement results of all types. buttons to view different types of results and their components. MZC-304 – USER MANUAL...
  • Page 22 Press ENTER to overwrite the result or ESC to abort. Note: - Complete set of results (main result and supplementary results) for a given measuring function and measurement settings are stored in the memory. MZC-304 – USER MANUAL...

  • Page 23: Changing The Cell And Bank Number

    If the bank or cell number is flash- ing, its number can be changed. Use the buttons to view different types of results and their components. MZC-304 – USER MANUAL...

  • Page 24: Deleting Memory Data

    Press ENTER to start deleting or ESC to abort. The deletion pro- gress is shown on the display as scrolling cell num- bers. When deletion is complete, the meter generates three short beeps and sets the cell number to 1. MZC-304 – USER MANUAL...

  • Page 25: Deleting The Whole Memory

    The deletion pro- gress is shown on the display as scrolling bank and cell numbers. When deletion is complete, the me- ter generates three short beeps and sets the cell num- ber to 1. MZC-304 – USER MANUAL...

  • Page 26: Communication With A Computer

    In order to ensure the communication of the meter with a computer, Bluetooth/OR-1 module is re- quired with an additional software. A program that may be used for this purpose is Sonel Reader. It allows users to read and display the measurement data stored in the meter memory. This program may be downloaded free from the manufacturer's website: www.sonel.pl.
  • Page 27 On the computer start data storing programme. To transmit the da- ta, follow the instruction from your software. Press ESC to exit the transmission mode. Note: Standard pin for Bluetooth is the „0123”. Settings in the meter according to section 2.2. MZC-304 – USER MANUAL...

  • Page 28: Data Transmission With Or-1 Module

    Press ENTER, the radio transmission screen will appear. To transmit data, follow the instructions of the software. Press ESC to exit the transmission mode. Note: Standard pin for OR-1 is the „123”. Settings in the meter according to section 2.2. MZC-304 – USER MANUAL...

  • Page 29: Troubleshooting

    Rotary switch in a wrong Contact electrode is active the PE conductor ex- position. for the measurements of ceeds the detector the Z fault loop pa- threshold (about 50V) L-PE rameters. MZC-304 – USER MANUAL...

  • Page 30: Power Supply Of The Meter

    Measurements performed with an insufficient supply voltage feature additional errors which the user is unable to evaluate. Replacement of batteries The MZC-304 is powered by four LR6 batteries or AA size rechargeable batteries. They are placed in the compartment at the bottom of the enclosure. WARNING: Before replacing the batteries, disconnect the test leads from the meter.

  • Page 31: General Rules Of Using The Nickel Metal Hydride (Ni-Mh) Batteries

    The probes can be cleaned with water and then wiped dry. Before longer storage, it is recom- mended to lubricate the probes with any machine grease. Clean the spools and leads with water and detergents, then wipe dry. The meter electronic system is maintenance free. MZC-304 – USER MANUAL...

  • Page 32: Storage

    Measurement of fault loop impedance Z L-PE Measurement of fault loop impedance Z Test range according to IEC 61557: Test lead Measurement range Z 0.13...1999  1,2m 0.17...1999  0.21...1999  0.29...1999  0.19...1999  WS-01, -05, -07 MZC-304 – USER MANUAL...
  • Page 33 : 220V, 230V, 240V  Operating voltage range: 180…270V  Rated mains frequency f : 50Hz, 60Hz  Operating frequency range: 45…65Hz  Control of correctness of PE terminal connection by means of a contact electrode MZC-304 – USER MANUAL...
  • Page 34 (3% m.v. + 3 digits) 200...1999  1   Voltage at open terminals: 4…9V  : 8…15mA Short-circuit current I  Audio signal for measured resistance < 30 ± 50%  Compensation of test leads resistance MZC-304 – USER MANUAL...

  • Page 35: Additional Information

    Frequency 99%..101% Mains voltage 85%..110% Harmonics DC component Additional uncertainty according to IEC 61557-4 (R ±200 mA) 9.2.2 Influencing value Designation Additional uncertainty Location Supply voltage 0,5% (BAT is not displayed) Temperature 0...35°C 1,5% MZC-304 – USER MANUAL...

  • Page 36: Equipment

    10 Equipment 10.1 Standard equipment Standard set of equipment supplied by the manufacturer includes:  MZC-304 meter – WMGBMZC304  set of test leads:  adapter WS-05 with angle plug UNI-SCHUKO (CAT III 300V) – WAADAWS05  leads 1,2m (CAT III 1000V) with banana plugs – 3 pcs (yellow WAPRZ1X2YEBB, red- WAPRZ1X2REBB and blue - WAPRZ1X2BUBB) ...

  • Page 37: Manufacturer

    The manufacturer of the device and provider of warranty and post-warranty service: SONEL S.A. Wokulskiego 11 58-100 Świdnica Poland tel. +48 74 858 38 60 fax +48 74 858 38 09 E-mail: export@sonel.pl Web page: www.sonel.pl NOTE Service repairs must be performed solely by the manufacturer. MZC-304 – USER MANUAL...

  • Page 38: Laboratory Services

    National Metrological Institute. According to ILAC-G24 „Guidelines for determination of calibration intervals of measuring instru- ments”, SONEL S.A. recommends periodical metrological inspection of the instruments it manufac- tures no less frequently than once every 12 months.

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