Bender NGRM500 Manuel utilisateur

Quick-start guide ENNGRM5xx_D00373_08_Q_XXEN/11.2022

NGRM500 (HRG)

NGRM550 (LRG)

Neutral Grounding Resistor Monitor (NGR)

Intended use

The NGRM500 is only intended for use in high-resistance

grounded systems. The NGRM550 is only intended for

use in low-resistance grounded systems. In these sys-

tems, the NGRM5… monitors

• the current through the neutral grounding resistor

(NGR),

• the voltage between the star point of the transform-

er and ground (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

Safety instructions

I Risk 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 the device and before working on

its connections, make sure that the installation has

been de-energized. Observe the rules for working

on electrical installations.

Quick-start guide for

Type Supply voltage/Frequency range USArt. No. Manual

NGRM500 AC 48…240V, 40…70 Hz

DC 48…240V

B94013500 D00373

NGRM550 B94013550

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

Mounting (DIN rail, screw mounting)

2 x Click!

1 x Click!

Ø M4

54 (2.12)

72 (2.83)

100 (3.94)

DIN rail Screw mounting

Dimension diagram (all dimensions in mm (in))

108 (4.25) 110 (4.33)

(3.66)

2 NGRM5xx_D00373_08_Q_XXEN/11.2022

NGRM500 (HRG), NGRM550 (LRG)

Star configuration

The "N" connection of the CD-series coupling device

should be as close to the transformer star point as

possible.

NGR

(G1)

E (G)

CD...

PE PE

VAQ

LINETRAXX®

NGRM5…

Ethernet

50m

AC/DC

48...240 V

11 12 14 21 22 24 31 32 34

Circuit breaker

NGR faultGround fault Trip

Connection X1

M+

I1 Digital 1 (congurable: pulser, NGR method)

I2 Reset IN

I3 Test IN

AModbus RTU (A)

BModbus RTU (B)

Common

M+ Analog output

Q2 Open collector: Pulser OUT

Q1 Open collector: Device health

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

NGRM500 (HRG), NGRM550 (LRG)

NGRM5xx_D00373_08_Q_XXEN/11.2022 3

Measuring current transformer selection

Depending on the system to be monitored, a suitable measuring current transformer has to be chosen. All common

measuring current transformers (50 mA or 5 A on the secondary side) can be used. The following table helps you with

the choice:

System type AC + DC AC AC AC

INGR 1…25 A 5…25 A 5…1000 A 10…2000 A

f0…3800 Hz 42…3800 Hz 50/60 Hz 50/60 Hz

Transformation ratio

Bender measuring current

transformer

Measuring range (see

CTUB103 manual)

5 A 100:1

10 A 200:1

25 A 500:1

600:1

Connecting cable

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

max. 40 m (6 mm²/AWG 10)

provided cable

or 0.75…1.5 mm²/AWG 18…16

Δn

Type CTUB103 CTAC…,WS… CTB31…51 Any standard

current transformer can

be used.

CT: terminal k NGRM5…: 50 mA NGRM5…: 50 mA NGRM5…: 5 A NGRM5…: 5 A

CT: terminal l NGRM5…: CNGRM5…: CNGRM5…: CNGRM5…: C

24 V

S1(k) S2(l)

CTUB103

CTB

WS…

CTAC…

4 NGRM5xx_D00373_08_Q_XXEN/11.2022

NGRM500 (HRG), NGRM550 (LRG)

Menu overview

1. Data meas. values

4. Pulser

3. History

5. Display

9. Info

History, Delete

Pulser, tImpuls

RNGR, INGR

HRG/LRG

system

NGR

Field calibration

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

CT primary, CT secondary, CT connection

10. Alarm Acknowledge, Reset, Test

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 IU

Device information, Software information,

Clock and date information, Ethernet information

Ground fault relay

NGR relay

Trip relay

Analogue

Digital in/out

Buzzer

Mode, Relay test

Device OUT, Pulser OUT,

Digital 1, Reset IN, Test IN

Buzzer alarm, Buzzer test

Mode, Function

UNGR Trip, INGR Trip, >RNGR, <RNGR (HRG only), tNGR trip,

GF trip, tGF trip, Alarm stored, trestart,

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

Lower limit harmonics

Method, Filter, Filter type, Filter size, Ignore values

Response

values

System

settings

8. Commissioning Setting Language, Clock, Usys L-L, f, INGR nom,

RNGR nom, CTprimary,CTsecondary, CTConnection, Field calibration

NGRM500 (HRG), NGRM550 (LRG)

NGRM5xx_D00373_08_Q_XXEN/11.2022 5

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

used

The setting for tGF trip must under no circumstances be

longer than the maximum possible operating time of the

CD-NGRM coupling device.

The table shows an overview of the tGF trip settings for the

coupling device used (menu 6.4):

Usys

Coupling

device

Ground-fault

trip setting max. tGF trip

400…690V CD1000 on or o 48 h

CD1000-2

691…1000V

CD1000 on 300 s

CD1000-2 on or o 48 h

CD5000

1001…4300V CD5000 on or o 48 h

4301…14550V CD14400 on 60 s

CD25000 on 90 s

14551…25000V CD25000 on 10 s

Initial commissioning

The commissioning wizard (menu 8) queries the follow-

ing parameters; additional settings: menu 6.

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 trip-

ping.

High trip threshold values: the device may not trip

at all

HRG system: Recommended minimum value

RNGR (tripping level 50 %)

Temperature range –40…+60 °C,

Field calibration at 20 °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)

() = Limited temperature range at any field calibration tem-

perature ±20 K

The temperatures must be within the limits of the operating

temperature range of –40…+70 °C

[for UL applications –40…+60 °C].)

6 NGRM5xx_D00373_08_Q_XXEN/11.2022

NGRM500 (HRG), NGRM550 (LRG)

2. System settings of the relays (menu 6.5)

The factory setting for the relays is fail-safe. In the case of

a test, the relays change state.

Fail-safe: The relay is energized during normal op-

eration and is de-energized in the event of a fault

("fail-safe")

Non-fail-safe: The relay is de-energized in normal

operation and is energized in the event of a fault

("non-fail-safe")

3. Field calibration (menu 6.6)

During field calibration, all tolerances of the connected

CD-series coupling device and the NGR are considered.

The current measured value is calibrated to the set nomi-

nal value of the NGR (RNGR 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.

For the field calibration the device must be in auto

mode (menu 6.3.1 = auto). If the digital input I1 is

used with "Digital 1 > NGR method" (menu 6.6.5.3),

"Method > external" (menu 6.3.1) must be selected

and I1 must be active. The trip relay is switched

during field calibration!

4. RMS trip signal, fundamental frequency,

harmonics

The measured value which causes tripping can be select-

ed via the "Trip signal" parameter (menu 6.4.11). Trip sig-

nal can be:

• RMS: The RMS value of Ior Uover the entire fre-

quency range (up to approx. 3.8 kHz).

• Fundamental frequency: Only the RMS value of

the fundamental frequency (50 or 60 Hz).

• Harmonics: The filtered RMS value on the selected

range of harmonics with

H0 = DC; H1 = fundamental frequency; H2 = 2 x funda-

mental frequency; … H32 = 32 x fundamental frequency

In the "Harmonics" measured value display (menu

2) all spectral lines are always displayed. This is in-

dependent of the trip signal setting.

On the standard display, the trip signal is indicat-

ed as resistance (in Ω or %) or as current (in A or

%). The setting is entered in "Display" (menu 5).

5. Initial measurement

During device start, all measured values are recorded.

Factory settings

Menu Factory settings

Menu 6.1: HRG/LRG system

1. Usys (L-L) 400V

2. CD-NGRM CD1000

3. Frequency 50 Hz

4. INGR nom 5 A

5. RNGR nom 150 Ω

Menu 6.2: CT

1. CT primary 600

2. CT secondary 1

3. CT connection 50 mA

Menu 6.3: NGR

1. Method auto

2. Filter o

Menu 6.4: Response values

HRG LRG

1. UNGRTrip 60 %

2. INGR trip 60 %

3. > RNGR 150 % (HRG), 250 Ω (LRG)

4. < RNGR

(HRG only) – 50 % (HRG)

5. tNGR trip 4. tNGR trip 0 s

6. Ground-fault

trip

5. Ground-fault

trip on

7. tGF trip 6. tGF trip 5 s

8. Alarm stored 7. Alarm stored on

9. trestart 8. trestart 5 s

10. Max. no. of

restarts

9. Max. no.

restarts 2

11.Trip signal 10. Trip signal RMS

12. Upper limit

harmonic

11. Upper limit

harmonic 32

13. Lower limit

harmonic

12. Lower limit

harmonic

NGRM500 (HRG), NGRM550 (LRG)

NGRM5xx_D00373_08_Q_XXEN/11.2022 7

Menu Factory settings

Menu 6.5: System settings

1. Ground-fault relay Mode: Fail-safe

Rel.Test: on

2. NGR-fault relay Mode: Fail-safe

Rel.Test: on

3.Trip relay Mode: Fail-safe

Rel.Test: on

4. Analog

Mode: 4-20 mA

Function: RNGR (HRG)

INGR (LRG)

5. Dig. in/out

Device OUT: Fail-safe

Pulser OUT: Non-fail-safe

Digital 1: Pulser, Active high

RESET IN: Active high

TEST IN: Active high

6. Buzzer Buzzer alarm: o

Buzzer test: on

NGRM500 (HRG), NGRM550 (LRG)

Nachdruck und Vervielfältigung

nur mit Genehmigung des Herausgebers.

Bender GmbH & Co. KG

Postfach 1161 • 35301 Grünberg • Deutschland

Londorfer Str. 65 • 35305 Grünberg • Deutschland

Tel.: +49 6401 807-0 • Fax: +49 6401 807-259

E-mail: [email protected] • www.bender.de

Reprinting and duplicating

only with permission of the publisher.

Bender GmbH & Co. KG

PO Box 1161 • 35301 Grünberg • Germany

Londorfer Str. 65 • 35305 Grünberg • Germany

Tel.: +49 6401 807-0 • Fax: +49 6401 807-259

E-mail: [email protected] • www.bender.de

UL File Numbers

E493737, E173157

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-fault, trip relays)

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

Contact data acc. to IEC 60947-5-1

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

Utilization 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

Utilization category .........................................................................DC12

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

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

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