Sonel MZC-320S User Manual
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Sonel MZC-320S User Manual

Short-circuit loop impedance meters
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  • Page 3 USER MANUAL SHORT-CIRCUIT LOOP IMPEDANCE METERS MZC-320S ● MZC-330S SONEL S.A. Wokulskiego 11 58-100 Świdnica Poland Version 1.11 04.10.2023...
  • Page 4 MZC-320S and MZC-330S meters are modern, easy in use and safe measuring devices. Please ac- quaint yourself with this manual in order to avoid measuring errors and prevent possible problems in operation of these meters.

  • Page 5: Table Of Contents

    Transmission to PC software ................... 33 7.4.3 Transmission via the network interface................34 8 Troubleshooting ..................... 35 8.1 Warnings and information displayed by the meter ..........35 8.1.1 Exceeding the measurement range ................. 35 MZC-320S ● MZC-330S – USER MANUAL...
  • Page 6 13 Technical specifications ................38 13.1 Basic data ......................38 13.2 Other technical data ....................41 13.3 Additional data ....................... 42 13.3.1 Additional uncertainties according to IEC 61557-3 (Z) ............. 42 14 Manufacturer ....................42 MZC-320S ● MZC-330S – USER MANUAL...

  • Page 7: General Information

    Grounding symbol at the end of the string of symbols reminds that the specified voltage is the voltage relative to the ground. Do not dispose of with other household waste AC current/voltage DC current/voltage MZC-320S ● MZC-330S – USER MANUAL...

  • Page 8: Safety

    CAT IV – concerns measurements performed at the source of low voltage installation. Safety MZC-320S and MZC-330S meters are designed for performing check tests of protection against electric shock in mains systems. The meters are used for making measurements and providing results to determine safety of electrical installations.
  • Page 9  Due to continuous development of the meter’s software, the actual appearance of the display, in case of some of the functions, may slightly differ from the display pre- sented in this operating manual. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 10: Graphical Display Panel (Lcd)

    Fig. 1 Screen appearance after switching the meter on (loop impedance measurement – all results) Fig. 2 Screen layout in alternating voltage measurement mode Fig. 3 Screen layout in short-circuit loop impedance measurement mode (all results) MZC-320S ● MZC-330S – USER MANUAL...
  • Page 11 Fig. 4 Screen layout in short-circuit loop impedance measurement mode (main result only) Fig. 5 Screen layout in the memory browse mode MZC-320S ● MZC-330S – USER MANUAL...

  • Page 12: Menu

    To select parameters use the keys . To select values use the keys and . In order to confirm changes to the settings, select Save? and the select YES and press the key ENTER. Fig. 7 Display settings MZC-320S ● MZC-330S – USER MANUAL...

  • Page 13: Loop Measurement Settings

    When selecting the nominal voltage, with the ENTER key a drop-down menu will appear, in which the selection is made with the keys. Fig. 9 Mains nominal voltage selection Language selection Submenu Language, enables the user to select a language that the device will use to display all text. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 14: Advanced Functions

    (on the picture – instead of horizontal lines). By pressing the key ENTER again another measurement will be initiated. To quit this option, select Exit and then press the key ENTER. You can also use the key ESC. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 15: Upgrading The Firmware

    On the device menu select the function Software upgrade and confirm that you have read the information displayed.  Follow the instructions. Information about the manufacturer and the software By activating this submenu, the user may obtain the basic information about the meter manufac- turer and the software version. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 16: Measurements

    110/190 V, 115/200 V, 127/220 V, 220/380 V, 230/400 V, 240/415 V, 290/500 V, 400/690 V (only MZC-330S). Applying voltages higher than 550 V for MZC-320S or 750 V for MZC-330S to any of the test terminals can damage the device.

  • Page 17: Conditions For Performing Tests And Obtaining Correct Results

    Inscription: OFL Two long beeps. Discharged battery. Making the measurements is still Displayed symbol possible, however, the user should take into account some additional errors. Displayed warnings stay on the screen for 3 seconds. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 18: Remembering The Last Measurement Result

    U (Fig. 11)  Set the rotary switch to position U  Fig. 11 Alternating voltage measurement The measurement result is displayed as shown on Fig. 12: Fig. 12 Alternating voltage measurement – result MZC-320S ● MZC-330S – USER MANUAL...

  • Page 19: Measurement Of Fault Loop Parameters

     The minimum time interval between successive measurements is 5 seconds. The text „READY” displayed on the screen informs the user that the device is ready to perform the measurement. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 20: Measurement Of Ntwork Voltage And Frequency

    In such event the display will show hori- zontal dashes instead of the short-circuit current value. Figure below shows voltage ranges for which the short-circuit current is calculated. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 21: Measurement Of Touch Voltage U

    MENU,  select Loop parameters settings,  in the item Measurement (4p), select U or U and save the selection (see sec. 3.3),  connect test leads according to Fig. 14 or Fig. 15: MZC-320S ● MZC-330S – USER MANUAL...
  • Page 22 U ) is to be connected to the probe that simulates human ST/T feet located on the ground (Fig. 15), whose properties and load are described by relevant standards. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 23: Selection Of Test Cables Length (For Measurements Using Two-Pole Method)

    An example of a display after a short-circuit loop measurement was performed is shown in Fig. 16. Fig. 16 Displaying the results of short-circuit loop parameters measurement If displaying of the main result only has been selected, the layout of the screen is as shown on Fig. 4. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 24: Measurement Of Short-Circuit Loop Parameters Using Two-Pole Method

    4.4.8 Measurement of short-circuit loop parameters using two-pole method This is a measurement involving a current with a value of up to 30 A (MZC-320S) or up to 40 A (MZC-330S). To make the measurement you need to:  connect the test leads to the sockets: I (2p) and I (Fig.
  • Page 25 Fig. 19 Measurement of impedance in working circuit (L-L) using two-pole method Fig. 20 Verification of anti-shock protection reliability of appliance’s housing using two-pole method for: a) TN networks b) TT networks MZC-320S ● MZC-330S – USER MANUAL...

  • Page 26: Measurement Of Short-Circuit Loop Parameters Using Four-Pole Method

    4p (I = 300A) ,  press the key START. Fig. 21 Measurement of impedance in working circuit (L-N) using four-pole method Fig. 22 Measurement of impedance in protective circuit (L-PE) using four-pole method MZC-320S ● MZC-330S – USER MANUAL...
  • Page 27 Fig. 23 Measurement of impedance in working circuit (L-L) using four-pole method Fig. 24 Verification of the anti-shock protection reliability of appliance’s housing using four- pole method for: a) TN networks b) TT networks MZC-320S ● MZC-330S – USER MANUAL...

  • Page 28: Measurement Of Earthing Resistances

    4.4.10 measurement of earthing resistances MZC-320S and MZC-330S meters can be used for rough measurements of earthing impedance and resistance. To do this, use the installation phase cable as an auxiliary voltage source – see Fig. 25. The measurement result is the sum of resistances of the earth electrode, working grounding, source and phase cable, thus it is burdened with a positive error.
  • Page 29 (test current will flow not only through the ground- ing system). Fig. 26 MZC-320S and MZC-330S connection diagram to be used when measuring the earth re- sistance for TN-C-S a) using two-pole method b) using four-pole method...

  • Page 30: Remote Control Of The Meter

     To trigger the measurement remotely, enter the measurement menu of the meter. Then touch the padlock in the application to unlock the option of measurement and then press START. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 31: Saving The Measurement Results

    Saving the measurement results MZC-320S and MZC-330S devices have a built-in memory for storing up to 990 results of short- circuit loop parameters. A location in the memory where a single result is stored is called a memory cell. The whole memory is divided into 10 banks, each consisting of 99 cells. Every result can be stored in a cell with a specific address and in a selected bank.

  • Page 32: Memory Browsing

    Cell deleted! and the meter will produce three short beeps. In order to delete an entire bank you need to:  set the rotary switch to the MEM position,  select Bank deletion,  using the keys select the bank number, MZC-320S ● MZC-330S – USER MANUAL...

  • Page 33: Data Transmission

    The software package can be used to communicate with a range of instruments manufactured by SONEL S.A. that are equipped with an USB connection. Detailed information about the software is available from the manufacturer and the distributors.

  • Page 34: Data Transmission Via Bluetooth

    Follow the instructions of the module.  Turn on the meter and in MENU select the position Bluetooth transmission.  On a PC enter Bluetooth connectivity mode, select MZC-320S or MZC-330S device and establish the connection. Fig. 31 Screen of communication via Bluetooth ...

  • Page 35: Data Transmission Using Wi-Fi

    After restarting the meter, it automatically logs into the network to which it was previ- ously connected. 7.4.2 Transmission to PC software  Start the software to read /save data and proceed in accordance with its instructions. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 36: Transmission Via The Network Interface

    The current language of the web interface is shown in the upper right corner. To change it, tap this field. Then a list of interface languages will appear, from which you can choose a different one. If the change doesn't work, just refresh the page in your browser. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 37: Troubleshooting

    Troubleshooting Warnings and information displayed by the meter MZC-320S and MZC-330S devices display warnings that can be related to either its functioning or to external conditions affecting the measurement processes. 8.1.1 Exceeding the measurement range Text displayed Audible signal Reason...

  • Page 38: Before You Send The Device For Repairs

    Power supply of the meter Power supply voltage monitoring The battery charge is shown by the indicator located in the upper right corner of the display as shown in figure below. Fig. 34 Battery charge indicator MZC-320S ● MZC-330S – USER MANUAL...

  • Page 39: Charging Battery

    - Any misuse of the battery may cause its permanent damage. This may result in the ignition. The sell- er and the manufacturer shall not be liable for any damages resulting from improper handling Li-Ion battery pack. MZC-320S ● MZC-330S – USER MANUAL...

  • Page 40: Cleaning And Maintenance

    Frequency range: DC, 45 Hz...65 Hz  Input impedance of the voltmeter: 200 k  Frequency Measurement (for voltages  50 V) Range Resolution Accuracy (0.1% m.v. + 1 digit) 45.0 Hz...65.0 Hz 0.1 Hz MZC-320S ● MZC-330S – USER MANUAL...
  • Page 41 0.1 kA 200 kA...* 1 kA * max. 500 kA for MZC-320S or max. 690 kA for MZC-330S  Prospective fault current calculated and displayed by the meter may slightly differ from the value calculated by the user with a calculator, basing on the displayed value of the impedance, because the meter calculates the current from unrounded value of fault loop impedance (which is used for displaying).
  • Page 42 Rated voltage of tested circuits U ▪ Phase voltage – MZC-320S ......110 V, 115 V, 127 V, 220 V, 230 V, 240 V, 290 V ▪ Phase voltage – MZC-330S ....110 V, 115 V, 127 V, 220 V, 230 V, 240 V, 290 V, 400 V ▪...

  • Page 43: Other Technical Data

    ................EN 61326-1 and EN 61326-2-2 EN 55022 Compliance statement MZC-320S and MZC-330S are class A products. In a domestic environment these products may cause radio interference in which case the user may be required to take adequate measures (e.g. increasing the distance between affected products).

  • Page 44: Additional Data

    The manufacturer of the device provides all warranty and after-warranty repairs: SONEL S.A. Wokulskiego 11 58-100 Świdnica Poland tel. +48 74 884 10 53 (Customer Service) e-mail: customerservice@sonel.com web page: www.sonel.com Only the manufacturer is authorized to carry out service repairs. MZC-320S ● MZC-330S – USER MANUAL...
  • Page 45 NOTES MZC-320S ● MZC-330S – USER MANUAL...
  • Page 46 NOTES MZC-320S ● MZC-330S – USER MANUAL...

This manual is also suitable for:

Mzc-330s

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