Bender NGRM500 Manuel utilisateur

Quick-start guide ENNGRM500_D00373_03_Q_XXEN/03.2020

NGRM500

Neutral grounding resistor monitor

Mounting (DIN rail, screw mounting)

108 (4.25)

54 (2.12)

18 (0.71)

108 (4.25)

107, 3

(4.22)

100

(3.94)

72 (2.83)

54 (2.12)

Enclosure view (front, top, bottom)

SERVICE

TRIPPED

NGR FAULT

GROUND FAULT

ON MENU

RESET

DATAINFO

TEST

NGR Monitor

NGR = 265Ω

I NGR = 0,01A

NGRM500

LINETRAXX®ΩAV

C5ERSRETHX1 50m

11 12 1421 22 24 31 32 34

Ground fault NGR fault Trip

NGRM500

Dimension diagram

(all dimensions in mm (in))

(3.66)

108 (4.25)

110 (4.33)

Safety instructions

I Danger of electrocution due to electric shock!

Touching live parts of the system carries the risk of:

- An electric shock

- Damage to the electrical installation

- Destruction of the device

Before installing and connecting the device, make sure that the installation has been

de-energised. Observe the rules for working on electrical installations.

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),

• the voltage between the star point of the transformer and earth (voltage drop across the NGR),

• the condition of the NGR.

This quick-start guide does not replace the operating manual of the device.

Download: www.bender.de/manuals

„Klick“

3a.

3c.

3b.

2 NGRM500_D00373_03_Q_XXEN/03.2020

NGRM500

Connection X1

M+

I1 Pulser IN

I2 Reset IN

I3 Test IN

AModbus RTU (A)

BModbus RTU (B)

Ground

M+ Analogue output

Q2 Open Collector: Pulser OUT

Q1 Open Collector: System health

+Output for supply of external relays (+24V, max. 100 mA)

Star configuration

AC/DC

24...240 V

6 A6 A

NGR

Rs (G1)

E (G)

CD...

NGR

fault

Ground

fault Trip (optional trip circuit)

Circuit breaker

(for tripping systems)

50m

31 32 3421 22 24

11 12 14

X1 Ethernet

NGRM500

Measuring current transformer selection

Depending on the system to be monitored, a suitable measuring current transformer is required.

All common measuring current transformers (50 mA or 5 A on the secondary side) can be used.

The following table helps with the choice:

The "N" connection of the CD-

series coupling device should

be as close to the transformer

star point as possible.

NGRM500

NGRM500_D00373_03_Q_XXEN/03.2020 3

System type AC + DC AC AC

INGR 1…25 A 5…25 A 5…100 A

f0…3800 Hz 42…3800 Hz 50/60 Hz

Bender CT Ratio 600:1 600:1 60:5

Connecting cable

W…AB: max. 10 m

CTUB103: max. 30 m max. 40 m max. 25 m (4 mm²/AWG 12)

max. 40 m (6 mm²/AWG 10)

provided cable or cable of 0.75…1.5 mm²/AWG 18…16

IΔn

(Currents detected)

AC, pulsed AC, DC AC, pulsed AC AC, pulsed AC

Type

Bender CT

W35…120AB

CTUB103

W...AB

AN420

24 V

S1(k) S2(l)

CTUB103

W20…120

W1-S35…W5-S210

W...

W...S...

CTB31…41

CTB

CT: Terminal k NGRM500: 50 mA NGRM500: 50 mA NGRM500: 5 A

CT: Terminal l NGRM500: CNGRM500: CNGRM500: C

AC/DC Measuring current transformer connection (W…AB)

NGRM...

50mA

50 mm

1.97 in

250 mm

9.84 in

+12VGND–12V

WXS...

NGR CD...

N N

W...AB

4 NGRM500_D00373_03_Q_XXEN/03.2020

NGRM500

Menu structure

1. Data meas. values

4. Pulser

3. History

5. Display

9. Info

History, Delete

Pulser, tImpuls

RNGR, INGR

HRG system

NGR

Field calibration

Usys (L-L), f, INGR nom, RNGR nom

CT primary, CT secondary, CT connection

10.

Alarm Acknowledge, Reset, Te st

RNGR,RNGR rel,Method, Rsense, Irms,Irms rel, Urms,Urms rel, Ifund,

Ifund rel, Ufund,Ufund rel, Iharm, Iharm rel, Uharm, Uharm rel,

6. HRG settings

7. Device settings

Language, Clock, Interface, Display, Password, Factory setting,

Software, Service

2. Harmonics

Device information, Software information,

Clock and date information, Ethernet information

Earth fault relay

NGR relay

Trip relay

Analogue

Digital in/out

Buzzer

Mode, Relay test

System OUT, Pulser OUT,

Pulser IN, Reset IN, Test IN

Buzzer alarm, Buzzer test

Mode, Function

UNGR Trip, INGR Trip, >RNGR, <RNGR, tNGR trip,

GF trip, tGF trip, Alarm stored, trestart,

Max. no. of restarts, Trip signal, Upper limit harmonics,

Lower limit harmonics

Method, PT primary, PT secondary

Response

values

System

settings

8. Commissioning

Setting Language, Clock, Usys L-L, f, INGR nom,

RNGR nom, CTprimary,CTsecondary, CTConnection, Field calibration

NGRM500

NGRM500_D00373_03_Q_XXEN/03.2020 5

Recommended minimum value RNGR (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)

CD1000/CD1000-2 CD1000-2 CD5000 CD14400 CD25000

Usys 400 V 600 V 690 V 1000 V 2400 V 4200 V 6000 V 6600 V 7200 V 11000 V 14400 V 25000 V

INGR

1 A 231 Ω 346 Ω 398 Ω 577 Ω 1386 Ω — — — — — — —

5 A 46 Ω 69 Ω 80 Ω 115 Ω 277 Ω 485 Ω 693 Ω 762 Ω 831 Ω 1270 Ω 1663 Ω —

10 A (23 Ω) 35 Ω 40 Ω 58 Ω 139 Ω 242 Ω 346 Ω 381 Ω 416 Ω 635 Ω 831 Ω 1443 Ω

15 A (15 Ω) (23 Ω) (27 Ω) 38 Ω 92 Ω 162 Ω 231 Ω 254 Ω 277 Ω 423 Ω 554 Ω 962 Ω

20 A —(17 Ω) (20 Ω) 29 Ω 69 Ω 121 Ω (173 Ω) 191 Ω 208 Ω 318 Ω 416 Ω 722 Ω

25 A — — (16 Ω) (23 Ω) 55 Ω 97 Ω (139 Ω) (152 Ω) (166 Ω) 254 Ω 333 Ω 577 Ω

30 A ———(19 Ω) (46 Ω) 81 Ω (115 Ω) (127 Ω) (139 Ω) 212 Ω 277 Ω 481 Ω

40 A — — — — (35 Ω) 61 Ω (87 Ω) (95 Ω) (104 Ω) (159 Ω) 208 Ω 361 Ω

50 A — — — — (28 Ω) (48 Ω) —(76 Ω) (83 Ω) (127 Ω) (166 Ω) 289 Ω

100 A — — — — — (24 Ω) — — — — (83 Ω) (144 Ω)

Maximum trip times t(GFtrip) for the used CD-NGRM

The setting for tGF trip must not be longer than the maximum operating time of the CD series…

coupling device. The table shows an overview of the t(GFtrip) settings for the coupling device

used:

Usys Coupling

device

Ground-fault trip settings (menu 6.5.6)

(Select Oﬀ for ground-fault alarm-only systems)

max. tGF trip (menu 6.5.7)

(For ground-fault tripping systems)

400…690V CD1000 on or o 24 h

CD1000-2

691…1000V

CD1000 on 300 s

CD1000-2 on or o 24 h

CD5000

1001…4300V CD5000 on or o 24 h

4301…14550V CD14400 on 60 s

CD25000

14551…25000V CD25000 on 10 s

Initial commissioning

The commissioning wizard (menu 8) queries the following parameters

(additional settings: menu 6):

6 NGRM500_D00373_03_Q_XXEN/03.2020

NGRM500

Language (8.2) Select

Date (8.3) Set

Time (8.4) Set

Usys L-L (8.5) System voltage

Frequency (8.6) 50 or 60 Hz

INGR nom (8.7)

RNGR nom (8.8)

CT primary (8.9)

CT secondary (8.10)

CT connection (8.11) 50 mA or 5 A

Field calibration (8.12)

Start or do not start

1. Setting the response values (menu 6.4)

• Trip threshold for voltage (UNGR)

• Trip threshold for current (INGR)

• Trip threshold for resistance (RNGR)

Low trip threshold values: may lead to false tripping.

High trip threshold values: the device may not trip.

2. System settings of the relay -output modes (menu 6.5)

The factory setting for the relay outputs is fail-safe. The relays only change state when a test is

initiated if so configured.

Fail-safe: The relay is energised during normal operation and is de-energised in the event of a

fault ("fail-safe").

Non-fail-safe: The relay is de-energised in normal operation and is energised in the event of a

fault ("non-fail-safe").

3. Field calibration (menu 6.6)

After the parameters have been entered, a field calibration can be carried out to set RNGR = RNGR

nom.

4. Trip signal RMS, fundamental frequency, harmonics

The frequency response for neutral current and voltage trips or alarms can be selected via the

"Trip signal" parameter (menu 6.4.11). Trip signal can be:

• RMS: The r.m.s. value of Ior Uover the entire frequency range (up to approx. 3.8 kHz).

• Fundamental frequency: The r.m.s. value of the fundamental frequency component

(50 or 60 Hz) of Ior U.

• Harmonics: The filtered r.m.s. value of the selected frequency range where

H0 = DC; H1 = fundamental frequency; H2 = 2 x fundamental frequency (second harmonic); …

H32 = 32 x fundamental frequency (32nd harmonic)

In the "Harmonics" measured value display (menu 2) all frequencies are always displayed. This

is independent of the trip signal setting.

On the data measured values display (menu 1), the measured resistance can be shown in Ω or

% of nominal, and the measured current can be shown in A or % of nominal. (in A or %). The

selection is entered in "Display" (menu 5).

5. Initial measurement

During device start, all measured values are recorded.

NGRM500

NGRM500_D00373_03_Q_XXEN/03.2020 7

Factory settings

Menu 6.1: HRG system Menu 6.4: Response values Menu 6.5: System settings

1. Usys (L-L) 400V 1. UNGR trip 60 % 1. Ground-fault relay Mode: Fail-safe

Relay test: on

2. CD-NGRM CD1000 2. INGR trip 60 % 2. NGR relay Mode: Fail-safe

Relay test: on

3. Frequency 50 Hz 3. > RNGR 150 % 3. Trip relay Mode: Fail-safe

4. INGR nom 5 A 4. < RNGR 50 % Relay test: on

5. RNGR nom 470 Ω 5. tNGR trip 0 s 4. Analogue Mode: 4-20 mA

Menu 6.2: CT 6. Ground fault trip on Function: R NGR

1. CT primary 600 7. tGF trip 5 s

5. Dig. in/out

System OUT: Fail-safe

2. CT secondary 1 8. Alarm stored on Pulser OUT: Non-fail-safe

3. CT connection 50 mA 9. trestart 5 s Pulser IN: Active high

Menu 6.3: NGR 10. Restart count 2 RESET IN: Active high

1. Method auto 11.Trip signal RMS TEST IN: Active high

2. PT primary 1 12. Upper limit harmonic 32 6. Buzzer Buzzer alarm: o

3. PT secondary 1 13. Lower limit harmonic 0 Buzzer test: on

Bender GmbH & Co. KG

Londorfer Straße 65 • 35305 Grünberg • Germany

Tel.: +49 6401 807-0 • [email protected] • www.bender.de

USA, Mexico, Central America • Exton PA, USA

800.356.4266 / 610.383.9200 • [email protected]

www.bender.org

Canada • Missisauga ON, Canada

800.243.2438 / 905.602.9990 • [email protected]

www.bender-ca.com

South America • Santiago de Chile

+59 2.2933.4211 • [email protected]

www.bender-latinamerica.com

Reprinting and duplicating only with permission of the publisher

Technical data

Rated voltage......................................................................250 V

Overvoltage category............................................................... III

Nominal supply voltage US............................AC/DC, 48…240 V

for UL applications ......................................AC/DC, 48…240 V

for AS/NZS 2081 applications......................AC/DC, 48…230 V

Tolerance Us......................................................................±15 %

Tolerance Us(for UL applications).........................–50…+15 %

Tolerance Us(for AS/NZS 2081 applications).........–25…+20 %

Frequency range Us.............................................DC, 40…70 Hz

Power consumption (max.)................................... ≤ 7 W / 16 VA

Switching elements (Ground-fault, NGR, trip relay)

......... Changeover contacts, configurable fail-safe/non-fail-safe)

Contact data acc. to IEC 60947-5-1

Rated operational voltage ............................... AC 250 V/250 V

Utilisation category ............................................. AC-13/AC-14

Rated operational current AC....................................... 5 A/3 A

Rated operational current AC (for UL applications)....... 3 A/3 A

Rated operational voltage DC..............................220/110/24 V

Utilisation category...........................................................DC12

Rated operational current DC..................................0.1/0.2/1 A

Minimum current .....................................1 mA at AC/DC > 10 V

UL File Number

E173157

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