HT Instruments PV-ISOTEST User Manual
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HT Instruments PV-ISOTEST User Manual

HT Instruments PV-ISOTEST User Manual

1500v pv insulation tester
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© Copyright HT ITALIA 2025
Release EN 2.02 - 29/04/2025

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Summary of Contents for HT Instruments PV-ISOTEST

  • Page 1 © Copyright HT ITALIA 2025 Release EN 2.02 - 29/04/2025...

  • Page 2: Table Of Contents

    PV-ISOTEST TABLE OF CONTENTS PRECAUTIONS AND SAFETY MEASURES ............... 3 1.1. Preliminary instructions ....................3 1.2. During use ........................4 1.3. After use .......................... 4 1.4. Definition of measurement (overvoltage) category ............4 GENERAL DESCRIPTION ................... 5 2.1. Foreword ......................... 5 2.2.
  • Page 3 PV-ISOTEST 11. APPENDIX – THEORETICAL OUTLINE ..............38 11.1. Measurement of polarization index (PI) ................. 38 11.2. Dielectric Absorption Ratio (DAR) .................. 38 11.3. GFL Function – Theoretical aspects and references guidelines ........39 11.4. DUAL and TMR functions – Technical insights .............. 41 11.4.1.

  • Page 4: Precautions And Safety Measures

    PV-ISOTEST 1. PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with directive IEC/EN61010-1 relevant to electronic measuring instruments. Before and while carrying out measurements, observe the following indications and read all notes preceded by the symbol with the utmost attention.

  • Page 5: During Use

    PV-ISOTEST 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. • The symbol “...

  • Page 6: General Description

    PV-ISOTEST 2. GENERAL DESCRIPTION 2.1. FOREWORD This instrument has been designed to carry out safety tests on photovoltaic (PV) modules/strings in order to verify the parameters declared by the manufacturer. In addition, this instrument measures insulation/continuity on PV modules/strings/fields. 2.2.

  • Page 7: Preparation For Use

    PV-ISOTEST 3. PREPARATION FOR USE 3.1. INITIAL CHECKS Before shipping, the instrument has been checked from an electric as well as 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

    PV-ISOTEST 4. NOMENCLATURE 4.1. DESCRIPTION OF THE INSTRUMENT CAPTION: 1. Inputs 2. LCD display     3. Keys , SAVE/ENTER 4. Compartment of connector for optical/USB cable 5. Key GO/STOP 6. Key HELP/ 7. Key ESC/MENU 8. Key ON/OFF Fig.

  • Page 9: Keyboard Description

    When switching on the instrument, the initial screen appears for a few seconds. It shows: P V - I S O T E S T • The instrument model (PV-ISOTEST) • The manufacturer’s name H T I T A L I A •...

  • Page 10: General Menu

    PV-ISOTEST 5. GENERAL MENU Pressing the ESC/MENU key in any condition of the MENU 14/09 -17:34 instrument displays the general menu screen, in which the : Voltage instrument may be set, the saved measures can be displayed  : Insulation: and the desired measuring function can be selected.

  • Page 11: General

    PV-ISOTEST 5.1.3. General 15/10 – 18:04 Move the cursor to General by using the arrow keys (,) and confirm with ENTER. The instrument shows the screen :   AutoPowerOff which allows activating/deactivating the Auto Power Off :  ...

  • Page 12: Operating Instructions

    PV-ISOTEST 6. OPERATING INSTRUCTIONS RPE – CONTINUITY MEASUREMENT ON MODULES/STRINGS/PV FIELDS 6.1. The purpose of this measurement is performing a continuity test of the protective and equipotential conductors (e.g.: from rod to earth and connected foreign earth) and earth rods of SPDs on PV installations. The test must be carried out using a test current >...
  • Page 13 PV-ISOTEST 4. Use the arrow keys  or  and select the position “><”. 15/10 – 18:04 The display shows the screen to the side.  - - - I t e s t - - - - - - ...

  • Page 14: Carrying Out Continuity Measurements In Standard (Std) Mode

    PV-ISOTEST 6.1.2. Carrying out continuity measurements in Standard (STD) mode 15/10 – 18:04 1. Position the cursor onto RPE by using the arrow keys (,) and confirm with ENTER. The display shows the  following screen. The symbol “STD” is shown on the - - - display.
  • Page 15 PV-ISOTEST 15/10 – 18:04 6. Press the GO/STOP key to start the test. In case no error conditions occur, the instrument displays the message  “Measuring…” as shown in the screen to the side. - - - I t e s t - - - Measuring…...

  • Page 16: Carrying Out Continuity Measurements In Timer (Tmr) Mode

    PV-ISOTEST 6.1.3. Carrying out continuity measurements in Timer (TMR) mode 15/10 – 18:04 1. Position the cursor onto RPE by using the arrow keys (,) and confirm with ENTER. The display shows the  - - - following screen. 2. Use the arrow keys (,) to select the Timer mode. The...
  • Page 17 PV-ISOTEST 15/10 – 18:04 9. Press the GO/STOP key to start the test. In case no error conditions occur, the instrument starts a series of  0 . 2 3 continuous measurements for the entire duration of the set Timer, emitting a short sound every 3s, and...

  • Page 18: Anomalous Situations

    PV-ISOTEST 6.1.4. Anomalous situations 15/10 – 18:04 1. To zero the value of compensated resistance, carry out a new compensation procedure with a resistance higher  - - - than 5 as, for example, with open leads. The message “Zero Reset” appears on the display.

  • Page 19: M - Measurement Of Insulation On Pv Modules/Strings/Fields

    PV-ISOTEST M – MEASUREMENT OF INSULATION ON PV MODULES/STRINGS/FIELDS 6.2. The purpose of this function is measuring the insulation resistance of the active conductors of PV modules, strings and fields according to the prescriptions of IEC/EN62446-1 and IECEN61557-2 guidelines, with no need to use an external switch to short-circuit the positive and negative terminals.

  • Page 20: Measuring Insulation - Dual Mode

    PV-ISOTEST 6.2.1. Measuring insulation – DUAL mode 15/10 – 18:04 1. Position the cursor onto M by using the arrow keys M ( + ) ( - ) (,) and confirm with ENTER. The display shows the V t e s t...

  • Page 21: Measuring Insulation - Tmr Mode

    PV-ISOTEST CAUTION Upon pressing the GO/STOP key, different error messages can be displayed by the instrument (see § 6.2.3) and, therefore, the test cannot be started. Check and eliminate, if possible, the problem causing the error message before going on with the test.
  • Page 22 PV-ISOTEST 4. Use the arrow keys  or  and select the position “Lim.”. 15/10 – 18:04 M V t e s t ( - ) - - - The display shows the screen to the side. M  R i ( - ) - - - 5.
  • Page 23 PV-ISOTEST 15/10 – 18:04 9. Press and hold the GO/STOP key for 2s in order to M V t e s t ( - ) - - - start the test. In case no error conditions occur, the M ...

  • Page 24: Anomalous Situations

    PV-ISOTEST 6.2.3. Anomalous situations 15/10 – 18:04 1. In case the instrument detects one of the following M conditions: “|VPN| > 1500V”, “|VPE| > 1500V” or “|VNE| > ( + ) ( - ) V t e s t - - - - - - 1500V”, it stops the measurement, gives out a long...
  • Page 25 PV-ISOTEST 15/10 – 18:04 5. In case the instrument detects that the voltage between M ( + ) ( - ) the positive and negative poles is greater than the test V t e s t 1 5 2 0 1 5 1 0 voltage set, the message "VPN>Vtest"...
  • Page 26 PV-ISOTEST M  15/10 – 18:04 9. In TMR mode if the measured VNE voltage is greater V t e s t ( - ) - - - than the test voltage, the instrument shows the message M  R i ( - ) - - - “VEN >...

  • Page 27: Gfl - Searching For Conditions Of Low Insulation On Pv Strings

    PV-ISOTEST GFL – SEARCHING FOR CONDITIONS OF LOW INSULATION ON PV STRINGS 6.3. In GFL (Ground Fault Locator) function, the instrument can provide an indication about the position of a possible single fault of low insulation located in a string of the installation due, for example, to infiltrations of water or humidity in the junction boxes of PV modules.
  • Page 28 PV-ISOTEST 4. Use the arrow keys  or  and select the position 15/10 – 18:04 “Vtest” to set the test voltage. M  - - - 5. Use the arrow keys (,) to select one of the following test voltages (Vnom): 250, 500, 1000, 1500VDC.
  • Page 29 PV-ISOTEST 15/10 – 18:04 9. Press and hold the GO/STOP key for 2s in order to start the test (insulation measurement in DUAL mode). In M  - - - case no error conditions occur, the instrument displays the message “Measuring…” as shown in the screen to the side.
  • Page 30 PV-ISOTEST 15/10 – 18:04 13. In case a fault is present (Rp<Lim) in position 1 (between module 1 and 2), the instrument shows the M  0 . 0 screen to the side and the message “GND:Fault 1..2” on the display.

  • Page 31: Dmm - Multimeter Function

    PV-ISOTEST DMM – MULTIMETER FUNCTION 6.4. In this function, the instrument shows the RMS and DC values of voltages between the positive (+) and negative (-) pole, between the positive (+) pole and earth connection and between the negative (-) pole and earth connection, in order to check for the presence of AC components on input voltages.

  • Page 32: List Of Error Messages On The Display

    PV-ISOTEST 6.5. LIST OF ERROR MESSAGES ON THE DISPLAY NUMBER MESSAGE DESCRIPTION ACTIONS Error EEPROM Error ADP5587 Internal error Send instrument for assistance Error System Init Rins control greater than the set limit and possible Vtest not correct Resistive load too low in insulation...

  • Page 33: Storing Results

    PV-ISOTEST 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 34: Recall Of Data To Display And Memory Deletion

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

  • Page 35: Connecting The Instrument To The Pc

    PV-ISOTEST 8. CONNECTING THE INSTRUMENT TO THE PC CAUTION • The connection between instrument and PC is realized by means of cable C2006. • In order to transfer the data onto a PC, it is necessary to install beforehand both the management software and the drivers of cable C2006 on the PC itself.

  • Page 36: Maintenance

    PV-ISOTEST 9. MAINTENANCE 9.1. GENERAL INFORMATION The instrument you purchased is a precision instrument. 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 37: Technical Specifications

    PV-ISOTEST 10. TECHNICAL SPECIFICATIONS 10.1. TECHNICAL CHARACTERISTICS Accuracy is calculated as ±[%reading + (dgt * resolution)] at 23°C ± 5°C, <80%RH DC Voltage Range [V] Resolution [V] Accuracy   (1.0 1500 rdg + 2dgt) AC TRMS Voltage Range [V]...

  • Page 38: General Characteristics

    PV-ISOTEST 10.2. GENERAL CHARACTERISTICS 10.2.1. Reference gudelines Instrument safety: IEC/EN61010-1, IEC/EN61010-2-030, IEC/EN61010-2-033, IEC/EN61010-2-034 EMC: IEC/EN61326-1 Safety of measuring accessories: IEC/EN61010-031 General: IEC/EN62446-1 EMC environment of use : portable, Class A, Group 1 Measurement M: IEC/EN61557-2 Measurement RPE: IEC/EN61557-4 Insulation: double insulation...

  • Page 39: Appendix - Theoretical Outline

    PV-ISOTEST 11. APPENDIX – THEORETICAL OUTLINE 11.1. 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.

  • Page 40: Gfl Function - Theoretical Aspects And References Guidelines

    PV-ISOTEST GFL FUNCTION – THEORETICAL ASPECTS AND REFERENCES GUIDELINES 11.3. The GFL function performed by the instrument on a string of PV modules (see § 6.3) is capable of: ➢ Identify the presence of a single fault on the string disconnected from the inverter, from other strings, from any arresters and from functional earth connections ➢...
  • Page 41 PV-ISOTEST This insulation value, measured by the PV-ISOTEST instrument, would be acceptable according to the product standards of PV modules, but is however in contrast with the IEC/EN62446-1 verification standard which provides for a minimum insulation of 1M This regulatory "difference" is known to inverter manufacturers who in fact make the minimum value allowed for insulation (normally) settable and suggest approximately 100k...

  • Page 42: Dual And Tmr Functions - Technical Insights

    DUAL AND TMR FUNCTIONS – TECHNICAL INSIGHTS 11.4. The DUAL and TMR functions are the two modes in which the PV-ISOTEST instrument carries out insulation measurements on PV installations. In particular: ➢ DUAL mode → allows to perform insulation measurement on single modules, on single strings, on strings in parallel and on entire PV fields by operating on the (+) and (-) poles of the same, without the need to connect them in short circuit.
  • Page 43 The DUAL mode (currently present only on HT instruments) always falls into the type of Method 1, but uses more complex calculation equations (not based on the simple Ohm's...
  • Page 44 PV-ISOTEST Method 2 This method (see Fig. 11) involves short-circuiting (using a special safety device) the two poles (+) and (-) in order to zeroed the disturbance voltage Vo and then carry out an insulation resistance measurement « classical" between the common point of the short- circuited poles and earth Fig.

  • Page 45: Assistance

    PV-ISOTEST 12. ASSISTANCE 12.1. 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 46 WHERE T +39 0546 621002 | F +39 0546 621144 WE ARE M ht@ht-instruments.com | www.ht-instruments.it HT INSTRUMENTS SL C/ Legalitat, 89 08024 Barcelona – Spain T +34 93 408 17 77 | F +34 93 408 36 30 M info@htinstruments.es | www.ht-instruments.com/es-es/...

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