HT COMBI521 User Manual
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HT COMBI521 User Manual

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 Copyright HT ITALIA 2021
Release EN 1.01 - 27/09/2021

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  • Page 1  Copyright HT ITALIA 2021 Release EN 1.01 - 27/09/2021...

  • Page 2: Table Of Contents

    COMBI521 TABLE OF CONTENTS PRECAUTIONS AND SAFETY MEASURES ............... 4     1.1.  Preliminary instructions ..................... 4  1.2.  During use ......................... 5  1.3.  After use ..........................5  1.4.  Definition of measurement (overvoltage) category ............5  GENERAL DESCRIPTION ................... 6  ...
  • Page 3 COMBI521 6.7.10. Verification of protection against indirect contacts (TN systems) .......... 70     6.7.11. Anomalous situations ......................72     6.8.  LoZ: Line/Loop impedance with high resolution .............. 75  6.9.  1,2,3: Phase sequence and phase concordance test ............. 76 ...

  • Page 4: Precautions And Safety Measures

    COMBI521 1. PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with guidelines IEC/EN61557, BS7671 17th and 18th editions and IEC/EN61010, relevant to electronic measuring instruments. Before and after carrying out the measurements, carefully observe the following instructions: ...

  • Page 5: During Use

    COMBI521 1.2. DURING USE Please carefully read the following recommendations and instructions: CAUTION Failure to comply with the caution notes and/or instructions may damage the instrument and/or its components or be a source of danger for the operator.  Before changing function, disconnect the test leads from the circuit under test.

  • Page 6: General Description

    COMBI521 2. GENERAL DESCRIPTION 2.1. INSTRUMENT FUNCTIONS The instrument can perform the following tests:  RPE Continuity test of earth, protective and equipotential conductors with test current higher than 200mA and open-circuit voltage between 4V and 24V.  M Measurement of insulation resistance with continuous test voltage of 50V, 100V, 250V, 500V or 1000V DC.

  • Page 7: Preparation For Use

    COMBI521 3. PREPARATION FOR USE 3.1. INITIAL CHECKS Before shipping, the instrument has been checked from an electric as well as a mechanical point of view. All possible precautions have been taken so that the instrument is delivered undamaged. However, we recommend checking it to detect any damage possibly suffered during transport.

  • Page 8: Nomenclature

    COMBI521 4. NOMENCLATURE 4.1. INSTRUMENT DESCRIPTION CAPTION: 1. Inputs 2. LCD display 3. ,, , , SAVE/ENTER keys 4. Compartment connector optical cable/USB port C2006 5. GO/STOP key 6. HELP/ 7. ESC/MENU key 8. ON/OFF key Fig. 1: Description of the front part of the instrument CAPTION: 1.

  • Page 9: Keyboard Description

    COMBI521 4.3. KEYBOARD DESCRIPTION The keyboard includes the following keys: ON/OFF key to switch on/off the instrument ESC key to exit the selected menu without confirming MENU key to go back to the general menu at any time     keys to move the cursor through the different screens in order to...

  • Page 10: General Menu

    COMBI521 5. GENERAL MENU Pressing the MENU/ESC key in any condition of the instrument allows going back to the general menu in which internal parameters may be set and the desired measuring function may be selected. MENU MENU MENU 15/10 – 18:04 15/10 –...

  • Page 11: Country

    COMBI521 5.1.2. Country Move the cursor to Country by means of the arrow keys 15/10 – 18:04 S E T (,) and confirm with ENTER. Subsequently, the display E u r o p e shows the screen which allows selecting the country of...

  • Page 12: General Settings

    COMBI521 5.1.4. General settings Move the cursor to General settings by means of the arrow 15/10 – 18:04 S E T keys (,) and confirm with ENTER. Subsequently, the Auto Power Off :   display shows the screen which allows enabling/disabling the Keys Beep : ...

  • Page 13: Operating Instructions

    COMBI521 6. OPERATING INSTRUCTIONS 6.1. AUTO: AUTOMATIC TEST SEQUENCE (RA , RCD, M) This function allows performing the following measurements in an automatic sequence:  Overall earth resistance without causing the RCD’s tripping (Ra )  Tripping current and tripping time of General RCDs type A (...
  • Page 14 COMBI521 TN systems Press the MENU key, move the cursor to AUTO in the 15/10 – 18:04 A U T O >  < main menu by means of the arrow keys (,) and confirm with ENTER. Subsequently the instrument I s c = - - - A Z L - N = - - - Ω...
  • Page 15 COMBI521 Press the GO/STOP key on the instrument or the START key on the remote switch probe. The instrument will start the automatic test sequence. CAUTION If message “Measuring…” appears on the display, the instrument is performing measurement. During this whole stage, do not disconnect the test leads of the instrument from the mains.
  • Page 16 COMBI521 In case of a negative result of the Ra test (Z and/or 15/10 – 18:04 A U T O >  < >199), the auto test is automatically blocked, the L-PE message “NOT OK” is shown and the screen to the side I s c = 1 4 3 7 A Z L - N = 0 .
  • Page 17 COMBI521 TT/IT systems 1. Press the MENU key, move the cursor to AUTO in the 15/10 – 18:04 A U T O >  < main menu by means of the arrow keys (,) and confirm with ENTER. Subsequently, the instrument R A = - - - ...
  • Page 18 COMBI521 CAUTION If message “Measuring…” appears on the display, the instrument is performing measurement. During this whole stage, do not disconnect the test leads of the instrument from the mains. The Ra test starts and the screen to the side appears on 15/10 –...
  • Page 19 COMBI521 In case of a negative result of the Ra test (see § 12.8), 15/10 – 18:04 A U T O >  < the auto test is automatically blocked, the message “NOT OK” is shown and the screen to the side is displayed.

  • Page 20: Anomalous Situations

    COMBI521 6.1.1. Anomalous situations 1. If the instrument detects a L-N or L-PE voltage higher 15/10 – 18:04 A U T O than the maximum limit (265V), it does not carry out the I s c = - - - A Z L - N = - - - Ω...

  • Page 21: Dmm: Digital Multimeter Function

    COMBI521 6.2. DMM: DIGITAL MULTIMETER FUNCTION This function allows reading the real time TRMS values of P-N Voltage, P-PE Voltage, N- PE Voltage and Frequency (@ P-N inputs) when the instrument is connected to an installation. Fig. 6: Instrument connection through mains plug Fig.
  • Page 22 COMBI521 3. The TRMS values of L-N voltage, L-PE voltage, N-PE 15/10 – 18:04 D M M voltage and the frequency of L-N voltage are shown on the display. FREQ. = 50.00 VL-N = 230 Press the GO/STOP key to enable/disable the “HOLD”...

  • Page 23: Rpe: Continuity Of Protective Conductors

    COMBI521 6.3. RPE: CONTINUITY OF PROTECTIVE CONDUCTORS This function is performed in compliance with standards IEC/EN61557-4, BS7671 17th/18th edition and allows measuring the resistance of protective and equipotential conductors. CAUTION  The instrument can be used for measurements on installations with overvoltage category CAT IV 300V to earth and max 415V between inputs.
  • Page 24 COMBI521 Fig. 9: Continuity test by means of remote switch probe Press the MENU key, move the cursor to RPE in the main 15/10 – 18:04 R P E menu by means of the arrow keys (,) and confirm with - - - ...

  • Page 25: Tmr Mode

    COMBI521 CAUTION Always make sure, before any test, that the compensation resistance value of the cables is referred to the cables currently used. In case of doubt, repeat the cable calibration procedure as indicated in § 6.3.2. Press the GO/STOP key on the instrument or the START key on the remote switch probe.

  • Page 26: Mode

    COMBI521 At the end of the set duration time, the instrument shows 15/10 – 18:04 R P E on the display the maximum value among all the partial 0 . 5 4  measurements performed and the message "OK" in case...

  • Page 27: Anomalous Situations

    COMBI521 6.3.3. Anomalous situations In case the detected value is higher than the set limit, the 15/10 – 18:04 R P E instrument gives a long acoustic signal and displays a 4 . 5 4  screen similar to the one reported here to the side.

  • Page 28: Lo: Continuity Of Protective Conductors With 10A

    COMBI521 6.4. LO: CONTINUITY OF PROTECTIVE CONDUCTORS WITH 10A This function allows measuring the resistance of protective and equipotential conductors with a test current >10A by using the optional accessory EQUITEST connected to the instrument through the C2050 cable. The accessory must be directly powered by the mains on which measurements are performed.
  • Page 29 COMBI521 Use the ,  keys to select the “INFO” item. The screen L o  15/10 – 18:04 to the side is shown on the display indicating the L O W 1 0 A S N : 2 0 0 9 0 0 1 1 information relevant to the EQUITEST accessory.

  • Page 30: Anomalous Situations

    COMBI521 6.4.1. Anomalous situations If the instrument detects a voltage higher than 3V at its L o  15/10 – 18:04 terminals, it does not perform the test, it emits a prolonged - - -  acoustic signal and displays a screen like the one to the side.

  • Page 31: M: Measurement Of Insulation Resistance

    COMBI521 6.5. M: MEASUREMENT OF INSULATION RESISTANCE This function is performed in compliance with standards IEC/EN61557-2, BS7671 17th/18th edition and allows measuring the insulation resistance between the active conductors and between each active conductor and the earth. The following operating modes are available: ...
  • Page 32 COMBI521 Fig. 13: Insulation between L-N-PE by means of mains plug (MAN and AUTO) Fig. 14: Insulation between L-PE by means of mains plug (TMR mode) Fig. 15: Insulation between L-PE by means of single cables (TMR mode) EN - 32...
  • Page 33 COMBI521 Fig. 16: Insulation between L-PE by means of single cables and remote switch probe (TMR mode)) Press the MENU key, move the cursor to M in the main M  15/10 – 18:04 menu by means of the arrow keys (,) and confirm with - - - M ...
  • Page 34 COMBI521 CAUTION  Disconnect any cable not strictly involved in measurement.  Before connecting the test leads, make sure that there is no voltage at the ends of the conductors to be tested. 5. Connect the test leads and remote switch probe to the ends of the conductors to be tested as shown in Fig.

  • Page 35: Tmr Mode

    COMBI521 6.5.1. TMR mode With the arrow keys (,) select the "TMR" option in the M  15/10 – 18:04 "Mode" section. The instrument displays a screen like the - - - M  one shown to the side. Set the duration of the...

  • Page 36: Auto Mode

    COMBI521 6.5.2. AUTO mode With the arrow keys (,) select the "AUTO" option in M  15/10 – 18:04 the "Mode" section. The instrument displays a screen like - - - M Vt = - - - V RL-N the one shown to the side. Set the duration of the RL-PE - - - M...

  • Page 37: Anomalous Situations

    COMBI521 6.5.3. Anomalous situations If the instrument fails to generate the nominal voltage, it M  15/10 – 18:04 emits a long acoustic signal to indicate the negative result 0 . 0 1 M  of the test and displays a screen like the one at the side.
  • Page 38 COMBI521 If the instrument detects a voltage higher than 10V at its M  15/10 – 18:04 terminals, it does not perform the test, emits a prolonged - - - M  acoustic signal and displays a screen like the one at the side.

  • Page 39: Rcd: Test On Differential Switches

    COMBI521 6.6. RCD: TEST ON DIFFERENTIAL SWITCHES This function is performed in compliance with standard IEC/EN61557-6, BS7671 17th/18th edition and allows measuring the tripping time and current of molded-case differential switches of type A ( ) , AC ( ) or B ( ) being General (G) and Selective (S).
  • Page 40 COMBI521 Fig. 17: Connection for single-phase 230V system by means of mains plug Fig. 18: Connection for single-phase 230V system with single cables and remote switch probe Fig. 19: Connection for 400V + N + PE three-phase system by means of single cables and...
  • Page 41 COMBI521 Fig. 20: Connection for a 400V + N (no PE) three-phase system by means of single cables and remote switch probe Fig. 21: Connection for a 400V + PE (no N) system with cables and remote switch probe Press the MENU key, move the cursor to RCD in the R C D 15/10 –...

  • Page 42: Auto Mode

    COMBI521 3. Insert the green, blue and black connectors of the three-pin plug cable into the corresponding inputs B3, B4 and B1 of the instrument. As an alternative, use the single cables and apply the relevant alligator clips to the free ends of the cables. It is also possible to use the remote switch probe by inserting its multipolar connector into the input B1.

  • Page 43: Auto Mode

    COMBI521 7. In case of a positive result (all tripping times comply 15/10 – 18:04 R C D with what indicated in 12.4) of all the test sequentially 0 ° 1 8 0 ° performed, the “OK” message is shown and the screen...

  • Page 44: X1, X5 Modes

    COMBI521 7. In case of a positive result (all tripping times comply 15/10 – 18:04 R C D with what indicated in 12.4) of all the tests sequentially 0 ° 1 8 0 ° performed, the “OK” message is shown and the screen to the side is displayed by the instrument.

  • Page 45: Mode

    COMBI521 6.6.4. mode The standard defines the tripping times for RCDs at nominal current. The mode is used to detect the tripping time at tripping current (which could also be lower than the nominal current). Press the GO/STOP key on the instrument, the START R C D 15/10 –...

  • Page 46: Anomalous Situations

    COMBI521 6.6.5. Anomalous situations If the instrument detects a frequency higher than the R C D 15/10 – 18:04 maximum limit (63Hz), it does not carry out the test and - - - displays a screen like the one to the side.
  • Page 47 COMBI521 If the instrument detects that the phase L and neutral N R C D 15/10 – 18:04 leads are inverted, it does not carry out the test and a - - - screen similar to the one reported to the side is displayed.
  • Page 48 COMBI521 If the instrument detects the absence of the signal to R C D 15/10 – 18:04 terminal B1 (phase conductor), it provides the warning - - - screen shown to the side and blocks the execution of the tests.

  • Page 49: Loop: Line/Loop Impedance And Overall Earth Resistance

    COMBI521 6.7. LOOP: LINE/LOOP IMPEDANCE AND OVERALL EARTH RESISTANCE This function is performed in compliance with standard IEC/EN61557-3, BS7671 17th/18th edition and allows measuring the line impedance, the fault loop impedance and the prospective short-circuit current. CAUTION Depending on the selected electrical system (TT, TN or IT), some...
  • Page 50 COMBI521 Fig. 23: P-N/P-PE test for single-phase/two-phase systems with cables and remote probe Fig. 24: P-N/P-PE test for 400V+N+PE three-phase with single cables and remote probe Fig. 25: P-P measurement for 400V+N+PE three-phase systems Fig. 26: P-PE/P-N test for 400V + PE systems by means of single cables and remote probe...
  • Page 51 COMBI521 Fig. 27: P-PE measurement for IT systems by means of single cables and remote probe Fig. 28: P-PE 2-wire test for single-phase/two-phase 230V systems with mains plug Fig. 29: P-PE 2-wire test for single-phase/two-phase systems with cables and remote probe Fig.

  • Page 52: Test Types

    COMBI521 6.7.1. Test types The protection of electrical lines is the essential part of a project to guarantee correct functionality and avoid injury to persons or damage of property. To this purpose, the safety guidelines impose on electrical designers to also design the electrical installation in order to obtain: 1.
  • Page 53 COMBI521 Mode Condition x OK outcome Condition x OK outcome Condition x OK outcome No outcome No outcome No outcome Br.Cap Isc L-L max < BC Isc L-L max < BC Isc L-L max < BC (IscL-Lmin 2F) Tmax  Tmax <...

  • Page 54: Test Cable Calibration (Zeroloop)

    COMBI521 6.7.2. Test cable calibration (ZEROLOOP) In order to obtain better results, it is strongly recommended to perform the preliminary calibration of the test cables or of the cable with mains plug by using the ZEROLOOP accessory before performing the test. In this way, the instrument automatically subtracts the resistance of the test cables, providing the actual result on the display.
  • Page 55 COMBI521 The value of the test leads/mains plug resistance is L O O P 15/10 – 18:04 maintained by the instrument up to the reset operation  - - - performed by the user (for example, for the insertion of - - - ...

  • Page 56: Std Mode - Generic Test

    COMBI521 6.7.3. STD Mode – Generic test This mode performs the impedance measurement and the calculation of prospective short- circuit current without any evaluation. Therefore, at the end of the test, no outcome is given by the instrument. Press the MENU key, move the cursor to LOOP in the L O O P 15/10 –...
  • Page 57 COMBI521 Press the GO/STOP key on the instrument, the START L O O P 15/10 – 18:04 key on the remote switch probe or use the AutoStart Ipfc - - - feature (see § 5.1.5). The instrument starts the measurement and the “Measuring…” message is shown ...

  • Page 58: Br.cap Mode - Verification Of The Breaking Capacity Of Protection Devices

    COMBI521 6.7.4. Br.Cap mode – Verification of the breaking capacity of protection devices Press the MENU key, move the cursor to LOOP in the L O O P 15/10 – 18:04 main menu by means of the arrow keys (,) and - - - confirm with ENTER.
  • Page 59 COMBI521 Press the GO/STOP key on the instrument, the START L O O P 15/10 – 18:04 key on the remote switch probe or use the AutoStart - - - feature (see § 5.1.5). The instrument starts the measurement and the “Measuring…” message is shown ...

  • Page 60: Tript - Verification Of Protection Coordination

    COMBI521 6.7.5. TripT - Verification of protection coordination Press the MENU key, move the cursor to LOOP in the L O O P 15/10 – 18:04 main menu by means of the arrow keys (,) and - - - confirm with ENTER. Subsequently, the instrument...
  • Page 61 COMBI521 Note the presence of the correct voltage values between L O O P 15/10 – 18:04 L-L and L-PE corresponding to the selections carried out - - - in the initial phase (see § 5.1.3) as shown in the screen to the side.

  • Page 62: Ra 2-Wire Test - Verification Of Protection Against Indirect Contacts

    COMBI521 6.7.6. Ra 2-wire test - Verification of protection against indirect contacts Press the MENU key, move the cursor to LOOP in the L O O P 15/10 – 18:04 main menu by means of the arrow keys (,) and - - - confirm with ENTER.
  • Page 63 COMBI521 Note the presence of the correct voltage values between L O O P 15/10 – 18:04 L-PE corresponding to the selections carried out in the - - - initial phase (see § 5.1.3) as shown in the screen to the side.

  • Page 64: Ra 3-Wire Test - Verification Of Protection Against Indirect Contacts

    COMBI521 6.7.7. Ra 3-wire test - Verification of protection against indirect contacts 1. Press the MENU key, move the cursor to AUTO in the 15/10 – 18:04 L O O P main menu by means of the arrow keys (,) and confirm with ENTER.
  • Page 65 COMBI521 5. Note the correct voltage values between L-N and L-PE as 15/10 – 18:04 A U T O shown in the screen to the side. I s c = - - - A Z L - N = - - - Ω...

  • Page 66: Verification Of Protection Against Indirect Contacts (It Systems)

    COMBI521 6.7.8. Verification of protection against indirect contacts (IT systems) Press the MENU key, move the cursor to LOOP in the L O O P 15/10 – 18:04 main menu by means of the arrow keys (,) and Ipfc - - - confirm with ENTER.
  • Page 67 COMBI521 In case of positive result (contact voltage at the point L O O P 15/10 – 18:04 <50V or <25V), the “OK” message and the screen to the Ipfc side are displayed by the instrument. The screen contains the value of the first fault current measured, expressed in mA (see §...

  • Page 68: Verification Of Protection Against Indirect Contacts (Tt Systems)

    COMBI521 6.7.9. Verification of protection against indirect contacts (TT systems) Press the MENU key, move the cursor to LOOP in the L O O P 15/10 – 18:04 main menu by means of the arrow keys (,) and - - - ...
  • Page 69 COMBI521 Press the GO/STOP key on the instrument, the START L O O P 15/10 – 18:04 key on the remote switch probe or use the AutoStart  - - - feature (see § 5.1.5). The instrument starts the measurement and the “Measuring…” message is shown - - - on the display.

  • Page 70: Verification Of Protection Against Indirect Contacts (Tn Systems)

    COMBI521 6.7.10. Verification of protection against indirect contacts (TN systems) Press the MENU key, move the cursor to LOOP in the L O O P 15/10 – 18:04 main menu by means of the arrow keys (,) and - - - confirm with ENTER.
  • Page 71 COMBI521 13. Note the presence of the correct voltage values between L O O P 15/10 – 18:04 L-N and L-PE corresponding to the selections carried out - - - in the initial phase (see § 5.1.3) as shown in the screen to the side.

  • Page 72: Anomalous Situations

    COMBI521 6.7.11. Anomalous situations If the instrument detects a frequency higher than the L O O P 15/10 – 18:04 maximum limit (63Hz), it does not carry out the test and Ipfc - - - displays a screen like the one to the side.
  • Page 73 COMBI521 If the instrument detects a dangerous voltage on PE L O O P 15/10 – 18:04 conductor, it provides the warning screen shown to the Ipfc - - - side and blocks the execution of the tests. Check the PE conductor and earth connection efficiency.
  • Page 74 COMBI521 If the instrument detects that the phase L and neutral N L O O P 15/10 – 18:04 leads are inverted, it does not carry out the test and a Ipfc - - - screen similar to the one reported to the side is displayed.

  • Page 75: Loz: Line/Loop Impedance With High Resolution

    COMBI521 6.8. LOZ: LINE/LOOP IMPEDANCE WITH HIGH RESOLUTION This Line/loop impedance measurements with high resolution (0.1m) is performed by using the optional accessory IMP57 connected to the Master unit through the optical cable/RS-232 C2001 supplied with same accessory. The IMP57 must be directly powered by the mains on which measurements are performed.

  • Page 76: 1,2,3: Phase Sequence And Phase Concordance Test

    COMBI521 6.9. 1,2,3: PHASE SEQUENCE AND PHASE CONCORDANCE TEST This function allows testing the phase sequence and concordance with 1-wire method by direct contact with live parts (not on cables with insulating sheath). Fig. 31: Phase sequence check with test leads Fig.
  • Page 77 COMBI521 Press the GO/STOP key on the instrument or the START 1 2 3 15/10 – 18:04 key on the remote switch probe. The instrument will start the test. - - - The "Touch L1" message is shown on the display to...
  • Page 78 COMBI521 At the end of the test, if the detected phase sequence is 1 2 3 15/10 – 18:04 incorrect, the instrument displays a screen like the one shown to the side (result "213") and the “NOT OK” message. 2 1 3...

  • Page 79: Anomalous Situations

    COMBI521 6.9.1. Anomalous situations If the instrument detects an input voltage frequency 1 2 3 15/10 – 18:04 exceeding the allowed full scale, it will display a screen like the one to the side. - - - Freq. out of range...

  • Page 80: Leak: Leakage Current Measurement

    COMBI521 6.10. LEAK: LEAKAGE CURRENT MEASUREMENT This function allows measuring leakage current by means of an external clamp (optional accessory HT96U) or measuring AC TRMS current by using other transducers connected to input In1. Fig. 33: Indirect measurement of leakage current in three-phase systems Fig.
  • Page 81 COMBI521 CAUTION Possible additional earth connections could influence the measured value. In case of real difficulty in removing them, we recommend performing the measurement in an indirect way. Press the GO/STOP key to start measurement. The LEAK 15/10 – 18:04 instrument shows the message "Measuring..."...

  • Page 82: Aux: Measure Environmental Parameters With External Probes

    COMBI521 6.11 AUX: MEASURE ENVIRONMENTAL PARAMETERS WITH EXTERNAL PROBES By means of external probes, this function allows measuring the following environmental parameters:  °C air temperature in °C (through optional probe HT52/05)  °F air temperature in °F (through optional probe HT52/05) ...
  • Page 83 COMBI521 The measured value appears on the display in real time AUX 15/10 – 18:04 as shown in the screen on the side. 1 3 8 0 L u x Lx2k Colour 3000K MODE Type Temp 5. Press the SAVE key to store the test result in the instrument’s memory (see § 7.1) or...

  • Page 84: V%: Voltage Drop Of Mains

    COMBI521 6.10. V%: VOLTAGE DROP OF MAINS This feature allows evaluating the percentage value of voltage drop between two points of mains in which a protection device is installed and comparing this value to possible limit values specified by guidelines. The following modes are available: ...
  • Page 85 COMBI521 Press the MENU key, move the cursor to V% in the  V % 15/10 – 18:04 main menu by means of the arrow keys (,) and V% - - - confirm with ENTER. Subsequently, the instrument displays a screen similar to the one reported here to the - - - ...
  • Page 86 COMBI521 Use the ,  keys and move the cursor to the “Z><”  V % 15/10 – 18:04 position. Press the GO/STOP key on the instrument to V% - - - start the test. The result of the Z1(offset ) measurement is shown on the display above the “Z><”...

  • Page 87: Anomalous Situations

    COMBI521 6.10.1. Anomalous situations If the instrument detects a frequency higher than the  V % 15/10 – 18:04 maximum limit (63Hz), it does not carry out the test and V% - - - displays a screen like the one to the side.
  • Page 88 COMBI521 If the instrument detects a dangerous voltage on PE  V % 15/10 – 18:04 conductor, it provides the warning screen shown to the V% - - - side and blocks the execution of the tests. Check the PE conductor and earth connection efficiency.
  • Page 89 COMBI521 If the instrument detects that the phase L and neutral N  V % 15/10 – 18:04 leads are inverted, it does not carry out the test and a V% - - - screen similar to the one reported to the side is displayed.

  • Page 90: Pqa: Measuring Mains Parameters In Single-Phase Systems

    COMBI521 6.11 PQA: MEASURING MAINS PARAMETERS IN SINGLE-PHASE SYSTEMS This function allows measuring in real time mains voltage and phase current (with optional clamp transducer), the corresponding harmonics and evaluating power and power factor in single-phase systems. Fig. 38: Connection for measurements in a single-phase system Press the MENU key, move the cursor to PQA in the PQA 15/10 –...
  • Page 91 COMBI521 The screen on the side shows the values of the electric PQA 15/10 – 18:04 quantities in real time. Symbols “i” and “c” respectively V L - N = 2 3 0 . 5 V indicate the inductive or capacitive nature of the load.

  • Page 92: Evse: Safety Checks On Recharging Stations For Electric Cars

    COMBI521 6.11 EVSE: SAFETY CHECKS ON RECHARGING STATIONS FOR ELECTRIC CARS This function allows carrying out a complete test of electric safety on recharging stations for electric cars (EVSE systems – Electrical Vehicle Supply Equipment) by connecting it to the optional adapter EV-TEST100, capable of simulating the presence of an electric vehicle, measuring output voltage signals and simulating fault conditions according to the reference standards IEC/EN61851-1 and IEC/EN60364-7-722.
  • Page 93 COMBI521 Press the GO/STOP key. The screen on the side appears 15/10 – 18:04 on the display. The RPE test is carried out by the - - -  instrument only in STD mode. Set the limit threshold value and calibrate the test leads as shown in § 6.3.
  • Page 94 COMBI521 12. Press the SAVE key to partially save the test and to end 15/10 – 18:04 the sequence of tests. The instrument shows the message contained in the following screen for a few seconds. Repeat the sequence again, if necessary.
  • Page 95 COMBI521 16. For single-phase EVSE systems, press the GO/STOP M 15/10 – 18:04 key on the instrument. The instrument starts the 999 M Vt = 523 V RL-N > automatic test sequence of insulation resistance among RL-PE 250 M Vt = 525 V...
  • Page 96 COMBI521 21. Connect the instrument to the adapter as shown in the M 15/10 – 18:04 2/6 – L3 Insulation test diagram on the display (input B4 to input N, input B3 to input E and input B1 to input L3). Use the three...
  • Page 97 COMBI521 Test 3  Status check of the EVSE system The purpose of this test (consisting in 6 steps) is checking all internal statuses of the EVSE system according to the prescriptions of the reference standards, carrying out simulations with connected accessory EV-TEST100. The situations considered are the following: Select.
  • Page 98 COMBI521 26. Connect the instrument to the adapter as shown in the 15/10 – 18:04 3/6 – Checking status A diagram on the display (input B4 to input N, input B3 to input E and input B1 to input L1). Use the three...
  • Page 99 COMBI521 31. Press the SAVE key to partially save the test and to end 15/10 – 18:04 the sequence of tests. The instrument shows the message contained in the following screen for a few seconds. Repeat the sequence again, if necessary.
  • Page 100 COMBI521 34. Connect the instrument to the adapter as shown in the 15/10 – 18:04 3/6 – Checking status B diagram on the display (input B4 to input N, input B3 to input E and input B1 to input L1). Use the three...
  • Page 101 COMBI521 39. Press the SAVE key to partially save the test and to end 15/10 – 18:04 the sequence of tests. The instrument shows the message contained in the following screen for a few seconds. Repeat the sequence again, if necessary.
  • Page 102 COMBI521 44. The instrument displays the message "FAIL" in case of a 15/10 – 18:04 negative result of at least one test (see Table 3) L1-N V CP L1-PE = 1000 Hz N-PE 13.0 A NO OK STATUS 45. Press the SAVE key to partially save the test and to end 15/10 –...
  • Page 103 COMBI521 48. Press the GO/STOP key. The result of measurements is 15/10 – 18:04 shown in the screen on the side. The instrument displays the message "OK" in case of a positive result of the tests L1-N 230 V CP...
  • Page 104 COMBI521 53. Press the GO/STOP key to start the test on PE status. 15/10 – 18:04 The following screen appears on the display. Notice the presence of the status “FAULT PE” corresponding to the L1-N - - - V - - - V position “STATUS”...
  • Page 105 COMBI521 58. Connect the instrument to the adapter as shown in the 15/10 – 18:04 3/6 – Checking FAULT E diagram on the display (input B4 to input N, input B3 to input E and input B1 to input L1). Use the three...
  • Page 106 COMBI521 63. Press the SAVE key to partially save the test and to end 15/10 – 18:04 the sequence of tests. The instrument shows the message contained in the following screen for a few seconds. Repeat the sequence again, if necessary.
  • Page 107 COMBI521 Press the SAVE key to partially save the test, and to carry on with the subsequent test (no. 75). In case of a negative result (overall earth resistance LOOP 15/10 – 18:04 >(Utlim / In), the instrument displays the message “NO 1 7 6 ...
  • Page 108 COMBI521 Press the SAVE key to partially save the test, and to carry on with the subsequent test (no. 75). In case of a negative result (ZL-PE >Utlim/In), the 15/10 – 18:04 LOOP instrument shows the message “FAIL” and the screen on the side.
  • Page 109 COMBI521 Press the GO/STOP key. The instrument will start RCD 15/10 – 18:04 measuring and the display will show the message 2 4 m A “Measuring…”. During this whole stage, do not disconnect the test leads of the instrument from the - - - system being tested.
  • Page 110 COMBI521 Test 6  Test of RCD Type B of the EVSE system 82. Connect the instrument to the adapter as shown in the 15/10 – 18:04 6/6 – B Type RCD Ramp test diagram on the display (input B4 to input N, input B3 to input E and input B1 to input L1).
  • Page 111 COMBI521 86. Press the SAVE key to partially save the test and to end the sequence of tests. In case of a positive result, the instrument shows the message contained in the following screen for a few seconds. 87. Repeat the sequence again, if necessary.

  • Page 112: Storing Results

    COMBI521 7. STORING RESULTS The instrument allows saving max 999 measured values. The saved data can be recalled to the display and deleted at any moment, and, upon saving, they can be associated with up to a maximum of 3 levels of numeric markers relevant to the installation name, the PV string and the PV module (with max value 250).

  • Page 113: Recall Of Data To Display And Memory Deletion

    COMBI521 7.2. RECALL OF DATA TO DISPLAY AND MEMORY DELETION 1. Position the cursor onto MEM by using the arrow keys 15/10 – 18:04 D a t e T y p e (,) and confirm with ENTER. The screen to the side...

  • Page 114: Connecting The Instrument To The Pc

    COMBI521 8. CONNECTING THE INSTRUMENT TO THE PC The connection between a PC and the instrument can be done via a serial port (see Fig. 1 – part 4) by means of an optical cable/USB C2006 or by means a WiFi connection.

  • Page 115: Maintenance

    COMBI521 9. MAINTENANCE 9.1. GENERAL INFORMATION  While using and storing the instrument, carefully observe the recommendations listed in this manual in order to prevent possible damage or danger during use.  Do not use the instrument in environments with high humidity levels or high temperatures.

  • Page 116: Technical Specifications

    COMBI521 10. TECHNICAL SPECIFICATIONS Accuracy is calculated as: ±[%reading + (no. of digits) * resolution] at 23°C, <80%RH 10.1. TECHNICAL CHARACTERISTICS AC TRMS voltage Range [V] Resolution [V] Accuracy 15  460 (3%rdg + 2dgt) Frequency Range [Hz] Resolution [Hz] Accuracy 47.50 ...
  • Page 117 COMBI521 Test on RCD protection (molded-case type) Differential protection type (RCD): AC ( ), A ( ),General (G), Selective (S) and B( 100V 265V RCD type A, A and B (IN ≤100mA) Voltage range P-PE, P-N: 190V 265V RCD type B (IN = 300mA) Voltage range N-PE : <10V...
  • Page 118 COMBI521 Overall earth resistance without RCD tripping (Ra ) 100V  265V Voltage range P-PE, P-N: Voltage range N-PE: <10V 50/60Hz  5% Frequency: Overall earth resistance in systems with Neutral (3-wire) – (30mA or higher RCD) Accuracy Range [] Resolution []...
  • Page 119 COMBI521 DC Current with transducer clamp (In1 input – STD clamp) Range [mV] Resolution [mV] Accuracy -1999.9  -1.0 (5.0%rdg + 2dgt) 1.0  1999.9 Values lower to ±1mVDC are zeroed AC TRMS Current with transducer clamp (In1 input – STD clamp)
  • Page 120 COMBI521 MEASUREMENT OF NETWORK PARAMETERS AND HARMONICS DC Voltage Range [V] Resolution [V] Accuracy 15.0  265.0 (1.0rdg + 1dgt) 0.1V Values lower 15V are zeroed AC TRMS Voltage Range [V] Frequency [Hz] Resolution [V] Accuracy 15.0  459.9 (1.0rdg + 1dgt) 50/60Hz ±5%...

  • Page 121: Reference Guidelines

    COMBI521 Reactive clamp (@ 230V single phase systems 1Ph, cos=0, f=50/60Hz) FS clamp Range [kVAr] Resolution [kVAr] Accuracy  10A 0.000  9.999 0.001 10A  FS  200 0.00  999.99 0.01 (2.0rdg + 5 dgt) 200A  FS  1000 0.0 ...

  • Page 122: General Characteristics

    COMBI521 EMC: IEC/EN61010-2-034, IEC/EN61557-1 Technical documentation: IEC/EN61187 Safety of accessories: IEC/EN61010-031 Insulation: double insulation Pollution level: Measurement category: CAT IV 300V to earth, maximum 415V between inputs RPE: IEC/EN61557-4,BS7671 17th/18th ed., AS/NZS3000/3017 M: IEC/EN61557-2,BS7671 17th/18th ed., AS/NZS3000/3017 RCD: IEC/EN61557-6 (only on Phase-Neutral-Earth systems) LOOP P-P, P-N, P-PE: IEC/EN61557-3,BS7671 17th/18th ed., AS/NZS3000/3017...

  • Page 123: Service

    COMBI521 11. SERVICE 11.1. WARRANTY CONDITIONS This instrument is warranted against any material or manufacturing defect, in compliance with the general sales conditions. During the warranty period, defective parts may be replaced. However, the manufacturer reserves the right to repair or replace the product.

  • Page 124: Theoretical

    COMBI521 12. THEORETICAL APPENDIXES 12.1. CONTINUITY OF PROTECTIVE CONDUCTORS Check the continuity of:  Protective conductors (PE), main equalizing potential conductors (EQP), secondary equalizing potential conductors (EQS) in TT and TN-S systems  Neutral conductors having functions of protective conductors (PEN) in TN-C systems.

  • Page 125: Insulation Resistance

    COMBI521 12.2. INSULATION RESISTANCE Purpose of the test Check that the insulation resistance of the installation complies with the requirements of the applicable guidelines. This test has to be performed with the circuit being tested not powered and with the possible loads it supplies disconnected.

  • Page 126: Measurement Of Polarization Index (Pi)

    COMBI521 12.2.1. Measurement of polarization index (PI) The purpose of this diagnostic test is to evaluate the influence of the polarization effects. Upon the application of a high voltage to insulation, the electric dipoles distributed in the insulation align in the direction of the applied electric field. This phenomenon is called polarization.

  • Page 127: Checking Circuit Separation

    COMBI521 12.3. CHECKING CIRCUIT SEPARATION A SELV system is a zero-category system or safety extra low voltage system characterized by power supply from an independent (e.g. batteries, small generator set) or safety source (e.g. safety transformer), protective separation from other electrical systems (double or reinforced insulation or earthed metal screen) and absence of earthed points (insulated from the earth).
  • Page 128 COMBI521 EXAMPLE OF SEPARATION TEST BETWEEN ELECTRICAL CIRCUITS Insulation or safety transformer separating the circuits TEST BETWEEN ACTIVE PARTS Connect an instrument probe to one of the two conductors of the separated circuit and the other to one of the conductors of a non- separated circuit.

  • Page 129: Test On Differential Switches (Rcd)

    COMBI521 12.4. TEST ON DIFFERENTIAL SWITCHES (RCD) Purpose of the test Checking that the General (G) and Selective (S) differential protection devices have been correctly installed and adjusted and that they maintain their characteristics over time. The check must make sure that the differential switch trips at a current not higher than its...

  • Page 130: Verification Of The Breaking Capacity Of Protection Devices

    COMBI521 Measurement of tripping current for protection differential switches  This test aims at checking the real tripping current of general differential switches (it does not apply to selective differential switches).  In the presence of differential switches with selectable tripping current, it is useful to perform this test in order to check the real tripping current of the differential switch.

  • Page 131: Verify Of Protection Against Indirect Contacts In Tn Systems

    COMBI521 12.6. VERIFY OF PROTECTION AGAINST INDIRECT CONTACTS IN TN SYSTEMS Purpose of the test Protection against indirect contacts in TN systems must be guaranteed by means of a protection device against overcurrents (typically MCB or fuse), which switches off the...
  • Page 132 COMBI521 Depending on the set values of phase-phase, phase-neutral or phase-PE voltage (see § 5.1.3) and the measured value of fault loop impedance, the instrument calculates the minimum value of the prospective short-circuit current to be interrupted by the protection device.

  • Page 133: Ra Test In Tn Systems

    COMBI521 12.7. RA TEST IN TN SYSTEMS Protection against indirect contacts in TN systems must be guaranteed by means of a protection device against overcurrents (typically MCB or fuse) which switches off the power supply of the circuit or the electrical equipment in case of faults between an active part and a ground mass or a protection conductor within a interval not exceeding 5s, sufficient for the equipments.

  • Page 134: Verify Of Protection Against Indirect Contacts In Tt Systems

    COMBI521 12.8. VERIFY OF PROTECTION AGAINST INDIRECT CONTACTS IN TT SYSTEMS Purpose of the test Checking that the protection device is coordinated with the value of earth resistance. We cannot assume a priori a reference limit value for earth resistance when checking the measurement’s result.

  • Page 135: Verify Of Protection Against Indirect Contacts In It Systems

    COMBI521 12.9. VERIFY OF PROTECTION AGAINST INDIRECT CONTACTS IN IT SYSTEMS In IT systems, the active parts must be isolated from the ground or be connected to earth through an impedance of sufficiently high value. In case of a single earth fault, the first fault current is weak, and therefore it is not necessary to interrupt the circuit.

  • Page 136: Verify Of Protection Coordination L-L, L-N And L-Pe

    COMBI521 12.10. VERIFY OF PROTECTION COORDINATION L-L, L-N AND L-PE Purpose of the test Testing the coordination of protective devices (typically MCB or fuse) present in a single- phase or three-phase installation as a function of the limit time of fault extinction by the protection set by the user and the calculated value of the short-circuit current.
  • Page 137 COMBI521 CAUTION The instrument must be used to measure fault loop impedance values at least 10 times higher than the resolution value of the instrument in order to minimize errors. Depending on the set values of nominal voltage (see § 5.1.3) and the measured value of fault loop impedance, the instrument calculates the minimum value of the prospective short-circuit current to be interrupted by the protection device.

  • Page 138: Verifiy Of Voltage Drop On Mains

    COMBI521 12.11. VERIFIY OF VOLTAGE DROP ON MAINS Measurement voltage drop as a result of current flow through mains or a part of it can be very important. If necessary:  Verify the capability of an existing mains line to supply a load ...

  • Page 139: Voltage And Current Harmonics

    COMBI521 12.12. VOLTAGE AND CURRENT HARMONICS Any periodical non-sine wave can be represented as a sum of sinusoidal waves having each a frequency that corresponds to an entire multiple of the fundamental, according to the relation:    ...

  • Page 140: Presence Of Harmonics: Causes

    COMBI521 Odd harmonics Even harmonics Not multiple of 3 Multiple of 3 Relative voltage % Order h Relative voltage Relative voltage Order h Order h % Max % Max 6..24 Table 1 Limits for the harmonic voltages the supplier may introduce into the network...

  • Page 141: Presence Of Harmonics: Consequences

    COMBI521 12.12.2. Presence of harmonics: consequences In general, even harmonics, i.e. the 2 etc., do not cause problems. Triple harmonics, odd multiples of three, are added on the neutral (instead of cancelling each other) thus creating a condition of overheating of the wire which is extremely dangerous. Designers...

  • Page 142: Calculation Of Powers And Power Factors

    COMBI521 12.13. CALCULATION OF POWERS AND POWER FACTORS The instrument measures the values of RMS Voltage and RMS Current and calculates the average Power values for each period. The formulas for power calculation are:      ...
  • Page 144 Fax: +55 19 9979.11325 eMail: info@htinstruments.es eMail: ht@htitalia.it eMail: vendas@ht-instruments.com.br Web: www.htinstruments.es Web: www.ht-instruments.com Web: www.ht-instruments.com.br HT INSTRUMENTS USA LLC HT INSTRUMENTS GMBH HT ITALIA CHINA OFFICE 3145 Bordentown Avenue W3 Am Waldfriedhof 1b 意大利 HT 中国办事处 08859 Parlin - NJ - USA...

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