METREL MI 3122 Instruction Manual
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METREL MI 3122 Instruction Manual

Z line-loop / rcd
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Z Line-Loop / RCD
MI 3122

Instruction manual

Version 1.4, Code no. 20 751 245

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Summary of Contents for METREL MI 3122

  • Page 1: Instruction Manual

    Z Line-Loop / RCD MI 3122 Instruction manual Version 1.4, Code no. 20 751 245...
  • Page 2 (European Union) concerning safety and electromagnetic compatibility regulations © 2013 METREL The trade names Metrel, Smartec, Eurotest, Autosequence are trademarks registered or pending in Europe and other countries. No part of this publication may be reproduced or utilized in any form or by any means...

  • Page 3: Table Of Contents

    MI 3122 Smartec Z Line-Loop / RCD Table of contents Table of contents 1  Preface ..........................5  2  Safety and operational considerations ................6  2.1  Warnings and notes ......................6  2.2  Battery and charging ......................8  2.2.1  New battery cells or cells unused for a longer period ..........9 ...
  • Page 4 MI 3122 Smartec Z Line-Loop / RCD Table of contents 6.5.2  Clearing measurement(s) in selected location ............42  6.5.3  Clearing individual measurements ................43  6.6  Communication ........................ 44  7  Maintenance ........................45  7.1  Cleaning ........................... 45  7.2  Periodic calibration ......................45 ...

  • Page 5: Preface

    (except reading this instruction manual) to operate the instrument. In order for operator to be familiar enough with performing measurements in general and their typical applications it is advisable to read Metrel handbook Guide for testing and verification of low voltage installations.

  • Page 6: Safety And Operational Considerations

    MI 3122 Smartec Z Line-Loop / RCD Warnings and notes 2 Safety and operational considerations 2.1 Warnings and notes In order to reach high level of operator’s safety while carrying out various tests and measurements using Smartec Z Line-Loop / RCD, as well as to keep the equipment undamaged, it is necessary to consider the following general warnings: Warning on the instrument means »Read the Instruction manual with...
  • Page 7 MI 3122 Smartec Z Line-Loop / RCD Warnings and notes RCD functions Parameters set in one function are also kept for other RCD functions.  The Contact voltage test will normally not trip-out RCD of tested installation.  However, the RCD trip-out may occur and Uc measurement is affected as a result of existing PE leakage currents in the installation.

  • Page 8: Battery And Charging

    MI 3122 Smartec Z Line-Loop / RCD Battery and charging 2.2 Battery and charging The instrument uses six AA size alkaline or rechargeable Ni-Cd or Ni-MH battery cells. Nominal operating time is declared for cells with nominal capacity of 2100 mAh.

  • Page 9: New Battery Cells Or Cells Unused For A Longer Period

    MI 3122 Smartec Z Line-Loop / RCD Battery and charging 2.2.1 New battery cells or cells unused for a longer period Unpredictable chemical processes can occur during charging of new battery cells or cells that were unused for a longer period (more than 3 months). Ni-MH and Ni-Cd battery cells are affected to capacity degradation (sometimes called as memory effect).

  • Page 10: Standards Applied

    MI 3122 Smartec Z Line-Loop / RCD Standards applied 2.3 Standards applied The MI 3122 Smartec Z Line-Loop / RCD instrument is manufactured and tested according to the following regulations, listed below. Electromagnetic compatibility (EMC) IEC/ EN 61326-1 Electrical equipment for measurement, control and laboratory use -...

  • Page 11: Instrument Description

    MI 3122 Smartec Z Line-Loop / RCD Front panel 3 Instrument description 3.1 Front panel Figure 3.1: Front panel Legend: 1 LCD 128 x 64 dots matrix display with backlight. 2 TEST Starts measurements. TEST Acts also as the PE touching electrode.

  • Page 12: Connector Panel

    MI 3122 Smartec Z Line-Loop / RCD Connector panel 3.2 Connector panel Figure 3.2: Connector panel Legend: 1 Test connector Measuring inputs / outputs, connection of measuring cables. Protects from simultaneous access to test connector and power 2 Protection cover supply adapter socket / communication connectors.

  • Page 13: Back Site

    MI 3122 Smartec Z Line-Loop / RCD Back site 3.3 Back site Figure 3.3: Back site Legend: Side belt Battery compartment cover Fixing screw for battery compartment cover Back panel information label Holder for inclined position of the instrument Magnet for fixing instrument close to tested item (optional) Figure 3.4: Battery compartment...

  • Page 14: Display Organization

    MI 3122 Smartec Z Line-Loop / RCD Display organization 3.4 Display organization Function name Result field Test parameter field Message field Terminal voltage monitor Figure 3.5: Typical function display Battery indication 3.4.1 Terminal voltage monitor The terminal voltage monitor displays on-line the voltages on the test terminals and information about active test terminals.

  • Page 15: Result Field

    MI 3122 Smartec Z Line-Loop / RCD Display organization Instrument is overheated. The measurement is prohibited until the temperature decreases under the allowed limit. Result(s) can be stored. High electrical noise was detected during measurement. Results may be impaired. L – N polarity is changed.

  • Page 16: Backlight And Contrast Adjustments

    MI 3122 Smartec Z Line-Loop / RCD Display organization 3.4.7 Backlight and contrast adjustments With the BACKLIGHT key backlight and contrast can be adjusted. Toggles backlight intensity level. Click Locks high intensity backlight level until power is turned off or the Keep pressed for 1 s key is pressed again.

  • Page 17: Instrument Set And Accessories

    MI 3122 Smartec Z Line-Loop / RCD Instrument set and accessory 3.5 Instrument set and accessories 3.5.1 Standard set Instrument Three alligator clips   Short instruction manual Set of NiMH battery cells   Product verification data Power supply adapter ...

  • Page 18: Instrument Operation

    MI 3122 Smartec Z Line-Loop / RCD Function selection 4 Instrument operation 4.1 Function selection For selecting test function the FUNCTION SELECTOR shall be used. Keys: Select test / measurement function: <VOLTAGE TRMS> Voltage and frequency and phase sequence. ...

  • Page 19: Settings

    MI 3122 Smartec Z Line-Loop / RCD Settings 4.2 Settings Different instrument options can be set in the SETTINGS menu. Options are: Selection of language,  Setting the instrument to initial values,  Recalling and clearing stored results,  Setting the date and time, ...

  • Page 20: Initial Settings

    MI 3122 Smartec Z Line-Loop / RCD Settings 4.2.2 Initial settings Selecting this option will allow the user to reset the instrument settings and measurement parameters and limits to the manufacturers standard values. Figure 4.3: Initial settings dialogue Keys: Restores default settings.

  • Page 21: Memory

    MI 3122 Smartec Z Line-Loop / RCD Settings 4.2.3 Memory In this menu the stored data can be recalled and deleted. See chapter 6 Data handling for more information. Figure 4.4: Memory options Keys: UP / DOWN Selects option. Enters selected option.
  • Page 22 MI 3122 Smartec Z Line-Loop / RCD Settings Maximum RCD disconnection times differ in various standards. The trip-out times defined in individual standards are listed below. Trip-out times according to EN 61008 / EN 61009: ½I 2I 5I N N N...

  • Page 23: Isc Factor

    MI 3122 Smartec Z Line-Loop / RCD Settings 4.2.6 Isc factor Isc factor for calculation of short circuit current in Z-LINE and Z-LOOP can be selected in this menu. Figure 4.7: Selection of Isc factor Keys: Sets Isc value. UP / DOWN Confirms Isc value.

  • Page 24: Measurements

    MI 3122 Smartec Z Line-Loop / RCD Testing RCD 5 Measurements 5.1 Testing RCDs Various test and measurements are required for verification of RCD(s) in RCD protected installations. Measurements are based on the EN 61557-6 standard. The following measurements and tests (sub-functions) can be performed: Contact voltage, ...

  • Page 25: Contact Voltage (Rcd Uc)

    MI 3122 Smartec Z Line-Loop / RCD Testing RCD Connections for testing RCD Figure 5.2: Connecting the plug commander and the universal test cable 5.1.1 Contact voltage (RCD Uc) A current flowing into the PE terminal causes a voltage drop on earth resistance, i.e.

  • Page 26: Trip-Out Time (Rcdt)

    MI 3122 Smartec Z Line-Loop / RCD Testing RCD Loop resistance is indicative and calculated from Uc result (without additional proportional  factors) according to:  UK version Figure 5.3: Example of contact voltage measurement results Displayed results: Uc ..Contact voltage.

  • Page 27: Trip-Out Current (Rcd I)

    MI 3122 Smartec Z Line-Loop / RCD Testing RCD 5.1.3 Trip-out current (RCD I) A continuously rising residual current is intended for testing the threshold sensitivity for RCD trip-out. The instrument increases the test current in small steps through appropriate...
  • Page 28 MI 3122 Smartec Z Line-Loop / RCD Testing RCD RCD autotest procedure RCD Autotest steps Notes Select the function using the function selector switch.  Set sub-function AUTO.  Set test parameters (if necessary).  Connect test cable to the top of the instrument.
  • Page 29 MI 3122 Smartec Z Line-Loop / RCD Testing RCD Step 5 Step 6 Step 7 Step 8 Figure 5.6: Individual steps in RCD autotest Bottom Figure 5.7: Two parts of result field in RCD autotest Displayed results: , I  N, 0º), x1 ..

  • Page 30: Fault Loop Impedance And Prospective Fault Current

    MI 3122 Smartec Z Line-Loop / RCD Fault loop impedance 5.2 Fault loop impedance and prospective fault current Fault loop is a loop comprised by mains source, line wiring and PE return path to the mains source. The instrument measures the impedance of the loop and calculates the short circuit current and contact voltage.
  • Page 31 MI 3122 Smartec Z Line-Loop / RCD Fault loop impedance Fault loop impedance measurement procedure Select the function using the function selector switch. Z-LOOP  Select test parameters (optional).  Connect test cable to the top of the Smartec Z Line-Loop / RCD.

  • Page 32: Line Impedance And Prospective Short-Circuit Current

    MI 3122 Smartec Z Line-Loop / RCD Line impedance 5.3 Line impedance and prospective short-circuit current Line impedance is measured in loop comprising of mains voltage source and line wiring. It is covered by requirements of the EN 61557-3 standard.
  • Page 33 MI 3122 Smartec Z Line-Loop / RCD Line impedance Line to neutral Line to line UK version Figure 5.13: Examples of line impedance measurement result Displayed results: Z ....Line impedance, .... Prospective short-circuit current, Lim ..Low limit prospective short-circuit current value or high limit line impedance value for the UK version.

  • Page 34: Voltage, Frequency And Phase Sequence

    MI 3122 Smartec Z Line-Loop / RCD Voltage, frequency, phase sequence 5.4 Voltage, frequency and phase sequence Voltage and frequency measurement is always active in the terminal voltage monitor. In the special voltage trms menu the measured voltage, frequency and information about detected three-phase connection can be stored.
  • Page 35 MI 3122 Smartec Z Line-Loop / RCD Voltage, frequency, phase sequence Voltage measurement procedure Select the function using the function selector switch. VOLTAGE TRMS  Connect test cable to the top of the instrument.  Connect test leads to the item to be tested (see figures 5.15 and 5.16 ).

  • Page 36: Pe Test Terminal

    MI 3122 Smartec Z Line-Loop / RCD PE test terminal 5.5 PE test terminal It can happen that a dangerous voltage is applied to the PE wire or other accessible metal parts. This is a very dangerous situation since the PE wire and MPEs are considered to be earthed.
  • Page 37 MI 3122 Smartec Z Line-Loop / RCD PE test terminal PE terminal test procedure Connect test cable to the top of the instrument.  Connect test leads to the item to be tested (see figures 5.18 and 5.19 ). ...

  • Page 38: Data Handling

    MI 3122 Smartec Z Line-Loop / RCD Memory organization 6 Data handling 6.1 Memory organization Measurement results together with all relevant parameters can be stored in the instrument’s memory. 6.2 Data structure The instrument’s memory place is divided into 3 levels each containing 199 locations. The number of measurements that can be stored into one location is not limited.
  • Page 39 MI 3122 Smartec Z Line-Loop / RCD Memory organization Measurement field Type of stored measurement in the selected location. No. of selected test result / No. of all stored test results in selected location.

  • Page 40: Storing Test Results

    MI 3122 Smartec Z Line-Loop / RCD Storing test results 6.3 Storing test results After the completion of a test the results and parameters are ready for storing ( icon is displayed in the information field). By pressing the MEM key, the user can store the results.
  • Page 41 MI 3122 Smartec Z Line-Loop / RCD Storing test results Keys in recall memory menu (data structure field selected): Selects the location element (Object / Block / Fuse). Enters measurements field. Selects number of selected location element (1 to 199).

  • Page 42: Clearing Stored Data

    MI 3122 Smartec Z Line-Loop / RCD Clearing stored data 6.5 Clearing stored data 6.5.1 Clearing complete memory content Select CLEAR ALL MEMORY in MEMORY menu. A warning (see fig. 6.6) will be displayed. Figure 6.6: Clear all memory Keys in clear all memory menu Confirms clearing of complete memory content.

  • Page 43: Clearing Individual Measurements

    MI 3122 Smartec Z Line-Loop / RCD Clearing stored data Keys in dialog for confirmation to clear results in selected location: Deletes all results in selected location. TEST Exits back to delete results menu without changes. Exits back to main function menu without changes.

  • Page 44: Communication

    MI 3122 Smartec Z Line-Loop / RCD Communication Communication Stored results can be transferred to a PC. A special communication program on the PC automatically identifies the instrument and enables data transfer between the instrument and the PC. There are two communication interfaces available on the instrument: USB or RS 232.

  • Page 45: Maintenance

    MI 3122 Smartec Z Line-Loop / RCD Cleaning, Calibration, Service 7 Maintenance Unauthorized persons are not allowed to open the Smartec Z Line-Loop / RCD instrument. There are no user replaceable components inside the instrument, except the battery under rear cover.

  • Page 46: Technical Specifications

    MI 3122 Smartec Z Line-Loop / RCD Technical specifications 8 Technical specifications 8.1 RCD testing 8.1.1 General data Nominal residual current (A,AC) ..10 mA, 30 mA, 100 mA, 300 mA, 500 mA, 1000 mA Nominal residual current accuracy ..-0 / +0.1  I  ; I  = I  N, 2  I  N, 5  I  N -0.1 ...

  • Page 47: Trip-Out Time

    MI 3122 Smartec Z Line-Loop / RCD Technical specifications 8.1.3 Trip-out time Complete measurement range corresponds to EN 61557 requirements. Maximum measuring times set according to selected reference for RCD testing. Measuring range (ms) Resolution (ms) Accuracy 0.0  40.0 ...

  • Page 48: Rcd Selected

    MI 3122 Smartec Z Line-Loop / RCD Technical specifications Prospective fault current (calculated value) Measuring range (A) Resolution (A) Accuracy 0.00  9.99 0.01 10.0  99.9 Consider accuracy of fault 100  999 loop resistance measurement 1.00k  9.99k 10.0k ...

  • Page 49: Voltage, Frequency, And Phase Rotation

    MI 3122 Smartec Z Line-Loop / RCD Technical specifications Prospective short-circuit current (calculated value) Measuring range (A) Resolution (A) Accuracy 0.00  0.99 0.01 1.0  99.9 Consider accuracy of line 100  999 resistance measurement 1.00k  99.99k 100k  199k 1000 Test current (at 230 V) ......

  • Page 50: General Data

    MI 3122 Smartec Z Line-Loop / RCD Technical specifications General data (6  1.5 V battery or accumulator, size AA) Power supply voltage ......9 V Operation .......... typical 20 h Charger socket input voltage .... 12 V  10 % Charger socket input current .....

  • Page 51: A Appendix A - Fuse Table

    MI 3122 Smartec Z Line-Loop / RCD Appendix A – Fuse table A Appendix A - Fuse table A.1 Fuse table - IPSC Fuse type NV Rated Disconnection time [s] current Min. prospective short- circuit current (A) 32.5 22.3 18.7 15.9...
  • Page 52 MI 3122 Smartec Z Line-Loop / RCD Appendix A – Fuse table Fuse type B Rated Disconnection time [s] current Min. prospective short- circuit current (A) Fuse type C Rated Disconnection time [s] current Min. prospective short- circuit current (A) 10.8...

  • Page 53: Fuse Table - Impedances (Uk)

    MI 3122 Smartec Z Line-Loop / RCD Appendix A – Fuse table Fuse type D Rated Disconnection time [s] current Min. prospective short- circuit current (A) 10.8 21.6 32.4 70.2 86.4 172.8 A.2 Fuse table - impedances (UK) Fuse type B...

  • Page 54: Fuse Table - Impedances At 230 V A.c. (As/Nzs 3017)

    MI 3122 Smartec Z Line-Loop / RCD Appendix A – Fuse table 0,112 0,112 0,088 0,088 0,072 0,072 Fuse type BS 88-2 (systems E and G) Fuse type BS 1362 Rated Disconnection time [s] Rated Disconnection time [s] current current Max.
  • Page 55 MI 3122 Smartec Z Line-Loop / RCD Appendix A – Fuse table Type D Fuse Rated Disconnection time [s] Rated Disconnection time [s] current current Max. loop impedance (  ) Max. loop impedance (  ) 3.07 11.50 15.33 1.84...

  • Page 56: B Appendix B - Accessories For Specific Measurements

    MI 3122 Smartec Z Line-Loop / RCD Appendix B – Accessories B Appendix B - Accessories for specific measurements The table below presents standard and optional accessories required for specific measurement. The accessories marked as optional may also be standard ones in some sets.

  • Page 57: C Appendix C - Country Notes

    MI 3122 Smartec Z Line-Loop / RCD Appendix C – Country notes C Appendix C – Country notes This appendix C contains collection of minor modifications related to particular country requirements. Some of the modifications mean modified listed function characteristics related to main chapters and others are additional functions.
  • Page 58 MI 3122 Smartec Z Line-Loop / RCD Appendix C – Country notes Modifications of the chapter 5.2 Modified test parameters for fault loop impedance measurement Fuse type Selection of fuse type [---, FUSE, B, C, D] High limit fault loop impedance value for selected fuse.
  • Page 59 MI 3122 Smartec Z Line-Loop / RCD Appendix C – Country notes Z line impedance Isc ... prospective short-circuit current Lim ..high limit line impedance value. Prospective fault current I is calculated from measured impedance as follows:  ...

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