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Bender NGRM500 Manual

Bender NGRM500 Manual

Neutral grounding resistor monitor
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NGRM500
Neutral Grounding Resistor Monitor
NGRM500_D00373_02_M_XXEN/03.2020
Manual EN

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Summary of Contents for Bender NGRM500

  • Page 1 NGRM500 Neutral Grounding Resistor Monitor NGRM500_D00373_02_M_XXEN/03.2020 Manual EN...
  • Page 2 Bender GmbH & Co. KG Londorfer Str. 65 • 35305 Grünberg • Germany P.O. Box 1161 • 35301 Grünberg • Germany Tel.: +49 6401 807-0 • Fax: +49 6401 807-259 E-Mail: info@bender.de • www.bender.de © Bender GmbH & Co. KG All rights reserved.

  • Page 3: Table Of Contents

    Table of Contents 1. Important information ................7 How to use this manual ................... 7 Technical support: service and support ............ 8 1.2.1 First level support ..................8 1.2.2 Repair service ....................8 1.2.3 Field service ..................... 8 Training courses ....................9 Delivery conditions ...................
  • Page 4 Table of Contents 4. Installation ..................... 17 Dimension diagram NGRM500 ..............17 Enclosure views ....................18 Screw mounting ....................19 DIN rail mounting .................... 20 5. Connection ..................... 21 Connection requirements ................21 Connection descriptions of CD-series coupling device ..... 22 Recommended connecting cable to coupling device CD…...
  • Page 5 Table of Contents 7. Menu ....................... 37 Overview ......................37 Navigating through the menu ..............38 Changing settings ................... 38 Data measured values (menu 1) ..............39 Harmonics (menu 2) ..................39 History (menu 3) ....................40 Pulser (menu 4) ....................40 Display (menu 5) ....................
  • Page 6 Table of Contents 9. Analogue and digital I/O configuration ........... 59 Analogue output (menu 6.6.4) ..............59 Digital outputs (Q1, Q2) ................59 9.2.1 Use of Q1: System condition ..............60 9.2.2 Use of Q2: Pulser ..................60 Digital inputs ..................... 60 10.

  • Page 7: Important Information

    1. Important information 1.1 How to use this manual This manual is intended for qualified personnel working in electrical engineering and electronics! Always keep this manual within easy reach for future reference. To make it easier for you to understand and revisit certain sections in this manual, we have used symbols to identify important instructions and information.

  • Page 8: Technical Support: Service And Support

    Repair, calibration, testing and analysis of Bender products   Hardware and software update for Bender devices   Delivery of replacement devices for faulty or incorrectly delivered Bender devices   Extended warranty for Bender devices with in-house repair service or replacement  ...

  • Page 9: Training Courses

    ZVEI (Zentralverband Elektrotechnik- und Elektronikindustrie e.V., (German Elec- trical and Electronic Manufacturers' Association) also applies. Conditions of sale and delivery can be obtained from Bender in printed or electronic for- mat. 1.5 Inspection, transport and storage Inspect the dispatch and equipment packaging for damage, and compare the contents of the package with the delivery documents.

  • Page 10: Disposal

    13th August 2005 must be taken back by the manufacturer and disposed of properly. For more information on the disposal of Bender devices, refer to our homepage at www.bender.de -> Service & support.

  • Page 11: Safety Instructions

    The European standard EN 50110 can be used as a guide. 2.3 Intended use The NGRM500 is only intended for use in high-resistance grounded systems. In these systems, the NGRM500 monitors the current through the neutral grounding resistor (NGR), ...

  • Page 12: Glossary

    Safety instructions Systems with a high-resistance grounded star point can be used when an interruption of the power supply would involve excessive costs due to production stoppage (e.g. automotive production, chemical industry). The ground fault that occurs between a phase and earth does not require power-supply tripping in many of these systems.

  • Page 13: Function

    3. Function 3.1 Device features Determination of R with passive and active measurement methods   Continuous monitoring of the R even if the installation is de-energised;   Alarm or trip on ground fault   Monitoring of the current I ...

  • Page 14: Functional Description

    When the "auto" setting is selected, monitoring switches automatically between "active" and "passive" when neutral current or voltage exceeds or falls below the inter- nal threshold. The threshold is 15 % of the nominal value and can be adjusted by Bender service if required.

  • Page 15: Recommended Minimum Value Rngr (Tripping Level 50 %)

    Function 3.3 Recommended minimum value (tripping level 50 %) Temperature range –40…+70 °C, field calibration at 25 °C (Values shown in brackets: Limited temperature range 0…+40 °C, field calibration at 25 °C) 3.3.1 Recommended for system voltage ≤ 4300 V CD1000/CD1000-2 CD1000-2 CD5000...

  • Page 16: Recommended Rngr For System Voltage Usys > 4300 V

    Function 3.3.2 Recommended for system voltage > 4300 V CD14400 CD25000 6000 V 6600 V 7200 V 11000 V 14 400 V 25 000 V — — — — — — 693 Ω 762 Ω 831 Ω 1270 Ω 1663 Ω —...

  • Page 17: Installation

      DANGER Before installing and connecting the device, make sure that the installation has been de-energised. Observe the rules for working on electrical installations. 4.1 Dimension diagram NGRM500 Fig. 4.1: Dimension diagram NGRM500; All dimensions in mm (in) NGRM500_D00373_02_M_XXEN/03.2020...

  • Page 18: Enclosure Views

    Installation 4.2 Enclosure views NGRM500 Ground fault NGR fault Trip 11 12 14 21 22 24 31 32 34 NGRM500 Ω A V ® LINETRAXX MENU NGR Monitor Front RESET TEST NGR = 265Ω SERVICE I NGR = 0,01A TRIPPED...

  • Page 19: Screw Mounting

    1. Fix the three mounting clips delivered with the device (two of them packed separately) manually or using a tool, as illustrated below. 2. Drill the mounting holes for the M4 thread according to the drilling template. 3. Fix the NGRM500 using three M4 screws. 108 (4.25) 72 (2.83) 107,3 (3.94)

  • Page 20: Din Rail Mounting

    1. Fix the three mounting clips delivered with the device (two of them packed separately) manually or using a tool, as illustrated below. 2. Snap the NGRM500 on the DIN rail. 3. Fix the NGRM500 to the DIN rail by pushing the mounting clips until they click into place. 108 (4.25) 18 (0.71)

  • Page 21: Connection

    5. Connection 5.1 Connection requirements Only qualified personnel are permitted to carry out the work necessary to install, commission and run a device or system. Risk of electrocution due to electric shock! Touching live parts of the system carries the risk of: An electric shock ...

  • Page 22: Connection Descriptions Of Cd-Series Coupling Device

    Connection to star point G1, R Connection to R of the NGRM500 CD1000-2 CD1000 G, E Connection to E of the NGRM500 CD14400 CD5000 CD25000 Connection to the protective earth conductor of the installation (PE) 5.3 Recommended connecting cable to coupling device CD…...

  • Page 23: Star Connection

    11 12 14 21 22 24 31 32 34 AC/DC 24...240 V CD... NGRM500 R s (G1) E (G) Ethernet Fig. 5.1: Star configuration The "N" connection of the CD-series coupling device should be as close to the transformer star point as possible.

  • Page 24: Connection With Pulser

    21 22 24 31 32 34 11 12 14 AC/DC 24...240 V CD... NGRM500 R s (G1) E (G) Ethernet Pulser Fig. 5.2: Connection with pulser The "N" connection of the CD-series coupling device should be as close to the transformer star point as possible.

  • Page 25: Artificial Neutral (Delta Connection)

    11 12 14 21 22 24 31 32 34 11 12 14 21 22 24 31 32 34 AC/DC 24...240 V CD... NGRM700 NGRM500 R s (G1) E (G) Ethernet Fig. 5.3: Artificial neutral with a zigzag transformer NGRM500_D00373_02_M_XXEN/03.2020...

  • Page 26: Ct Connections

    W...AB W... Type AN420 CTUB103 W...S... 24 V S1(k) S2(l) CT: Terminal k NGRM500: 50 mA NGRM500: 50 mA NGRM500: 5 A CT: Terminal l NGRM500: C NGRM500: C NGRM500: C Tab. 5.1: Selecting the right measuring current transformer NGRM500_D00373_02_M_XXEN/03.2020...

  • Page 27: Connection To Relay Outputs (Ground-Fault, Ngr-Fault And Trip Relays)

    Connection Measuring current transformer connection (W…AB) 50 mm 1.97 in WXS... W...AB 250 mm 9.84 in 50mA –12V +12V NGRM... CD... Fig. 5.4: Measuring current transformer connection W…AB When using a W…AB current transformer the arrow on the top of the CT must point to the right as shown in the wiring diagram (setting >...

  • Page 28: Connection To The X1 Interface

    Connection 5.7 Connection to the X1 interface Pulser IN Reset IN Test IN Modbus RTU (A) Modbus RTU (B) Ground Analogue output Open Collector: Pulser OUT Open Collector: System state (system health) Output for supply of external relays (+24 V, max. 100 mA) Tab.

  • Page 29: X1: Output Q1

    Connection 5.7.2 X1: Output Q1…2 Internal 24 V Connection to PLC +24 V, +24 V, max. 100 mA max. 100 mA Pull up Pull up 10 kΩ 10 kΩ max. 300 mA, 24 V External supply e.g.12...24 V +24 V, max.

  • Page 30: X1: Analogue Output

    Connection 5.7.3 X1: Analogue output Analogue output Mode Permissible load Current output 0…20 mA ≤ 600 Ω 4…20 mA ≤ 600 Ω 0…400 μA ≤ 4 kΩ Voltage output 0…10 V ≥ 1 kΩ 2… 0 V ≥ 1 kΩ Either NGR current I or NGR resistance R can be assigned to the analogue out-...

  • Page 31: User Interface

    6. User interface 6.1 Operating elements NGRM500 ® LINETRAXX MENU RESET TEST SERVICE < TRIPPED INFO DATA NGR FAULT GROUND FAULT Legend to operating elements Description Explanation Display elements Operation LED, green; on when power supply is available The LC display shows device and measurement information.
  • Page 32 User interface Description Explanation The LED flashes in case of a prewarning: ground fault detected, ground-fault relay has tripped, trip relay has not tripped yet GROUND elapses). GF trip FAULT The LED is on: ground fault detected, trip relay has tripped (if so configured).

  • Page 33: Standard Display

    User interface 6.2 Standard display NGRM500 Ω A V ® LINETRAXX MENU NGR Monitor RESET TEST NGR = 265Ω SERVICE I NGR = 0,01A TRIPPED INFO DATA NGR FAULT GROUND FAULT The pulse symbol in the lower part of the display indicates that the resistance of the R is actively measured.

  • Page 34: Fault Indication (Active)

    User interface 6.3 Fault indication (active) NGRM500 MENU Fault R NGR RESET TEST limit exceeded SERVICE 2300Ω TRIPPED NGR FAULT GROUND FAULT Return from any (sub)menu to the standard display by pressing and holding ESC for more than 2 s.

  • Page 35: Fault Indication (Inactive)

    User interface 6.4 Fault indication (inactive) NGRM500 Ω A V ® LINETRAXX MENU UNGR(rms) Limit 269 V RESET TEST SERVICE 03.09.18 12:38 TRIPPED 03.09.18 12:38 DATA NGR FAULT GROUND FAULT An inactive fault is indicated on the display with a .

  • Page 36: History Memory

    If the maximum number of memory entries is reached, the old- est entry will be overwritten by a new event record. Display the history memory at MENU > 3. History NGRM500 Ω A V ® LINETRAXX...

  • Page 37: Menu

    7. Menu 7.1 Overview 1. Data meas. values , Method, R NGR rel sense, rms rel rms rel, fund fund rel fund fund rel, harm harm rel harm harm rel, 2. Harmonics 3. History History, Delete 4. Pulser Pulser, t Impuls 5.

  • Page 38: Navigating Through The Menu

    Return from any (sub)menu to the standard display by pressing and holding ESC for more than 2 s. 7.3 Changing settings Enter settings with text/numbers directly. There is a corresponding representation in the menu items: NGRM500 Ω A V ® LINETRAXX NGRM SERVICE <...

  • Page 39: Data Measured Values (Menu 1)

    Menu 7.4 Data measured values (menu 1) List of measured values. Navigate through the list using the buttons. Parameter Explanation NGR resistance value NGR relative resistance value NGR rel Method Measurement method (see menu 6.3) Resistance value CD-series coupling device Sense Current RMS value Current relative...

  • Page 40: History (Menu 3)

    Menu All harmonics are always displayed, regardless of the settings in the menus 6.5.11 and 6.5.12. Use ESC to return to the main menu. 7.6 History (menu 3) Alarm messages (since switching on the device or deleting the last history) are saved. History: Navigate through the list using the buttons.

  • Page 41: Display (Menu 5)

    Menu Pulser control Parameter X1: +24 V Parameter (impuls) Pulser 1...10 s Pull up 10 kΩ Active (ON) Dig. Output X1: Q2 Ground fault Auto detected Enable Dig. Input External X1: I2 Inactive (OFF) ext. Pulser enable Fig. 7.1: Pulser control 7.8 Display (menu 5) Choose whether the measured values for R and I...

  • Page 42: Ct (Menu 6.2)

    Menu 7.9.2 CT (menu 6.2) Menu Parameter Setting range Explanatory notes 6.2.1 CT primary 1…10,000 Ratio of the CT on the primary side 6.2.2 CT secondary 1…10,000 Ratio of the CT on the secondary side 6.2.3 CT connection 5 A, 50 mA Used CT connection Tab.
  • Page 43 The number of restart attempts can be selected between 1 and 5. The NGRM500 remains in "Alarm stored" mode (menu 6.5.8) even after a shutdown. Relay and restart response values Menu...
  • Page 44 Menu Menu Parameter Setting range Explanatory notes NGR trip Time delay between NGR fault detection On the and shutdown by the trip relay. t 6.4.5 0…60 s NGR trip device: is added to the response time. t(NGRtrip) Ground fault: Trip relay switches after the time delay t has elapsed.

  • Page 45: System Settings (Menu 6.5)

    Menu Menu Parameter Setting range Explanatory notes Trips on the full-spectrum RMS value (f = DC…3.8 kHz). Trips on the RMS value of the funda- Fundamental 6.4.11 Trip signal mental. Trips on the RMS value within the har- Harmonics monic filter upper and lower limits ( 6.5.11 and 6.5.12).
  • Page 46 Menu Setting Menu Parameter Explanatory notes range Mode (6.5.4.1) 0…20 mA 4…20 mA 0…400 μA 6.5.4 Analogue 0… 10 V 2… 10 V Function (6.5.4.2) System health Fail-safe, OUT (6.5.5.1) non-fail-safe Pulser OUT Fail-safe, (6.5.5.2) non-fail-safe Digital Active high: Activation of the 6.5.5 inputs/out- Pulser IN (6.5.5.3)

  • Page 47: Field Calibration (Menu 6.6)

    Menu 7.9.6 Field calibration (menu 6.6) During field calibration, all tolerances of the connected CD-series coupling device and the NGR are taken into account. The measured value is calibrated to the set nominal val- ue of the NGR (R NGR nom In order to achieve high accuracy, start the device and let it run for at least one hour in the operating environment before carrying out the field calibration.
  • Page 48 Decimal separators (7.4.2) Comma, point Password (7.5.1) Factory setting 0000 Password Status on, off Changes are discarded and reset to Factory settings factory settings Update via interface Software UPDATE Service For Bender service only Tab. 7.7: Device settings overview (menu 7) NGRM500_D00373_02_M_XXEN/03.2020...
  • Page 49 Set the time according to UTC (Coordinated Universal Time). For Germany, set +1 for wintertime (MEZ) and +2 for summer time (MESZ). Interface (menu 7.3) Set the parameters for connecting other communication devices to the NGRM500 in the interface menu: Write access (menu 7.3.1) Set whether the parameters of the device can be changed via Modbus and web server.
  • Page 50 TTL for subscription (menu 7.3.3.5) Set a time between 1 s…1092 min. This time determines in what intervals the NGRM500 sends mes- sages to e.g. a gateway. Severe alarms are always sent immediately.
  • Page 51 Menu Modbus TCP (menu 7.3.4) Settings for communication with other devices via Modbus TCP. Port 502 (menu 7.3.4.1) Choose whether Modbus TCP should be used: Modbus TCP can be used for communication with other devices. Modbus TCP cannot be used for communication with other devices. Modbus RTU (menu 7.3.5) Settings for communication with other devices via Modbus RTU.

  • Page 52: Commissioning (Menu 8)

    50 mA or 5 A Field calibration (8.12) Start or do not start 7.12 Info (menu 9) The NGRM500's settings can be viewed in the Info menu. Navigate through the differ- ent views using the arrow buttons: Device Name, serial number, article number...

  • Page 53: Initial Commissioning

    8. Initial commissioning The following parameters must be entered for initial commissioning: System voltage U (phase-to-phase)   The corresponding coupling device must be used depending on the system voltage: for U ≤ 4.3 kV: CD1000, CD1000-2, CD5000 (20 kΩ) for U >...

  • Page 54: Output Relays Operating Modes

    Initial commissioning Resistance trip thresholds ( Both trip thresholds for resistance are set as a percentage of R NGR nom Setting range of trip threshold R 10…90 % (factory setting 50 %) 110…200 % (factory setting 200 %). In the case of the passive measurement method the resistance R is determined us- ing the current and voltage measurements.
  • Page 55 Initial commissioning Explanatory notes on Trip relay In case of a ground fault, t is only considered when "GR trip" (menu 6.5.6) is enab-   GF trip led. When "GR trip" is disabled, the trip relay does not switch in the event of a ground fault.
  • Page 56 Initial commissioning Ground-fault relay timing diagram Ground fault Ground fault Ground fault relay Trip relay 40 ms = 100 ms...24 h,∞ GF trip Fig. 8.1: Ground-fault relay timing diagram NGR relay timing diagram NGR fault NGR fault NGR fault relay Trip relay <...

  • Page 57: Trip Signal: Rms, Fundamental, Harmonics

    Initial commissioning 8.3 Trip signal: RMS, fundamental, harmonics The NGRM500 trip-signal frequency response can be selected via the "Trip signal" pa- rameter (menu 6.5.10). Trip signal can be: The RMS value of current or voltage over the entire frequency range (up to approx.
  • Page 58 Initial commissioning NGRM500_D00373_02_M_XXEN/03.2020...

  • Page 59: Analogue And Digital I/O Configuration

    9. Analogue and digital I/O configuration 9.1 Analogue output (menu 6.6.4) Either NGR current I or NGR resistance R can be assigned to the analogue out- put. A voltage or current signal proportional to the measured value is applied to the output.

  • Page 60: Use Of Q1: System Condition

    Analogue and digital I/O configuration 9.2.1 Use of Q1: System condition No system Intern. 24 V System error Mode error +24 V, detected detected max. 100 mA Pull up Fail-safe energised de-energised 10 kΩ Q1 low Q1 high 24 V, max.

  • Page 61: Test Cycle

    10. Test cycle Since the output relays are not monitored in the hardware or software, they must be tested at regular intervals to verify proper functioning. The frequency of the test cycle is subject to the safety requirements of the operator but it should be carried out at least every six months.
  • Page 62 Test cycle NGRM500_D00373_02_M_XXEN/03.2020...

  • Page 63: Factory Settings

    11. Factory settings Menu Factory settings Menu 6.1: HRG system 1. U 400 V sys (L-L) 2. CD-NGRM CD1000 3. Frequency 50 Hz 4. I NGR nom 5. R 470 Ω NGR nom Menu 6.2: CT 1. CT primary 2. CT secondary 3.
  • Page 64 Factory settings Menu Factory settings 10. Restart count 11. Trip signal 12. Upper limit harmonic 13. Lower limit harmonic Menu 6.5: System settings Mode: fail-safe 1. Ground-fault relay Rel. test: Mode: fail-safe 2. NGR relay Rel. test: Mode: fail-safe 3. Trip relay Rel.

  • Page 65: Error Codes

    The installation must operate error- free before starting a field calibration. Field calibration could not be 6.11 Restart field calibration. started If the error persists, contact Bender service. Connection between measur- Check connection between measur- 7.61…7.63 ing equipment and display ing equipment and display unit.
  • Page 66 Error codes NGRM500_D00373_02_M_XXEN/03.2020...

  • Page 67: Technical Data

    13. Technical data 13.1 Tabular data Insulation coordination according to IEC 60664-1/IEC 60664-3/DIN EN 50178 Definitions Supply circuit (IC1) ................................. (A1, A2) Measuring circuit/Control circuit (IC2).......................(RS, E, CT), (X1, ETH) Output circuit 1 (IC3) ..............................(11, 12, 14) Output circuit 2 (IC4) ..............................(21, 22, 24) Output circuit 3 (IC5) ..............................(31, 32, 34) Rated voltage ..................................250 V Overvoltage category.................................
  • Page 68 Technical data Supply voltage Nominal supply voltage U .......................... AC/DC, 48…240 V for UL applications......................... AC/DC, 48…240 V for AS/NZS 2081 applications ....................... AC/DC, 48…230 V Tolerance U ..................................±15 % Tolerance U (for UL applications) ........................–50…+15 % Tolerance U (for AS/NZS 2081 applications).....................

  • Page 69: Measuring Range Ngr

    Technical data Measuring circuits 5 A and 50 mA Response value I ........................10…90 % I NGR nom Response delay Ground-fault relay....................≤ 40 ms (±10 ms) Response delay Trip relay (configurable)..................100 ms…24 h, ∞ Tolerance t when set to trip RMS ................................
  • Page 70 Technical data Digital outputs Galvanic separation .................................. no Length connecting cables ............................max. 10 m Currents (sink) for each output ..........................max. 300 mA Voltage ....................................24 V Overload capacity ............................... –5…32 V Analog output (M+) Operating mode ..................................Linear Functions..................................I Current ................0…20 mA (≤...
  • Page 71 Technical data Classification of mechanical conditions acc. to IEC 60721 / IEC 60255-21 / DIN EN 60068-2-6 Stationary use ................................3M7 Transport ................................2M4 Long-term storage..............................1M12 Connection Screw-type terminals Tightening torque......................0.5…0.6 Nm (5…7 lb-in) Stripping length..............................7 mm Recommended connecting cables.....................see overview page 22 rigid/flexible......................

  • Page 72: Ordering Details

    Technical data 13.2 Ordering details 13.2.1 NGR monitor Supply voltage/Frequency range Type Art. No. NGRM500 AC 48…240 V, 40…70 Hz / DC 48…240 V B94013500 13.2.2 Accessories CD-series coupling device Voltage Type Art. No. 400…690 V CD1000 B98039010 400…1000 V...
  • Page 73 Technical data Voltage supply for AC/DC measuring current transformers W… Type Supply voltage Terminal Art. No. Push-wire terminal B74053100 AC 100…250 V, 50/60 Hz AN420 DC 100…250 V Screw-type terminal B94053100 Measuring current transformers CTUB103… max. connected measuring current Type Art.
  • Page 74 Technical data NGRM500_D00373_02_M_XXEN/03.2020...
  • Page 75 Technical data NGRM500_D00373_02_M_XXEN/03.2020...
  • Page 76 Technical data NGRM500_D00373_02_M_XXEN/03.2020...
  • Page 77 INDEX DST (Daylight Saving Time) 49 Acknowledging a fault message 35 Alarm 52 Analogue output 59 Error codes 65 Ethernet 49 BCOM 50 Factory settings 63 Fault indication 34 Field calibration 47 CEST (Central European Summer Time) 49 Connection - Measuring current transformer 26 - Relay 27 Glossary 12 - Usys >...
  • Page 78 INDEX Menu 2 39 Star connection Menu 3 40 - Usys > 690 V 25 Menu 4 40 - Usys ≤ 690 V 23 Menu 5 41 Subsystem 50 Menu 6 41 Support 8 Menu 7 47 Menu 8 52 Menu 9 52 Technical data 67 Modbus TCP 51...
  • Page 80 Bender GmbH & Co. KG Londorfer Straße 65 • 35305 Grünberg • Germany Tel.: +49 6401 807-0 • info@bender.de • www.ben- der.de USA, Mexico, Central America Exton PA, USA 800.356.4266 / 610.383.9200 • info@bender.org www.bender.org Canada • Missisauga ON, Canada 800.243.2438 / 905.602.9990 •...

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