Bender NGRM500 Manuel utilisateur

NGRM5xx_D00373_09_Q_XXEN / 02.2024

NGRM500 (HRG),

NGRM550 (LRG)

Neutral Grounding Resistor Monitor (NGR)

Quick-start guide EN

2 NGRM5xx_D00373_09_Q_XXEN / 02.2024

NGRM500 (HRG), NGRM550 (LRG)

Neutral Grounding Resistor Monitor (NGR)

This quick-start guide does not replace the manual!

Quick-start guide for the following devices

Type Supply voltage/Frequency range UsArt. No. Manual

NGRM500 AC 48…240V, 40…70 Hz

DC 48…240V

B94013500 D00373

NGRM550 B94013550

Scope of delivery

• NGRM500/NGRM550

• Safety instructions

• Quick-start Manual

Intended use

The NGRM500 is only intended for use in high-resistan-

ce grounded systems. The NGRM550 is only intended

for use in low-resistance grounded systems. In these

systems, the NGRM5… monitors

• the current through the neutral grounding resistor

(NGR),

• the voltage between the star point of the transformer

and ground (voltage drop across the NGR),

• the condition of the NGR.

Any other use than that described in the manual is

regarded as improper. Intended use includes all the

instructions in the manual.

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 installati-

on has been de-energized. Observe the rules for

working on electrical installations.

Dimension diagram (all dimensions in mm (in))

108 (4.25) 110 (4.33)

(3.66)

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)

NGRM5xx_D00373_09_Q_XXEN / 02.2024 3

NGRM500 (HRG), NGRM550 (LRG)

Connection X1

M+

I1 Digital 1 (configurable: 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)

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

4 NGRM5xx_D00373_09_Q_XXEN / 02.2024

NGRM500 (HRG), NGRM550 (LRG)

Measuring current transformer selection

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

mon 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

IΔn

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

transformer can be used.

24 V

S1(k) S2(l)

CTUB103

AS…

AC…

CTB

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

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

NGRM5xx_D00373_09_Q_XXEN / 02.2024 5

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, 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 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

6 NGRM5xx_D00373_09_Q_XXEN / 02.2024

NGRM500 (HRG), NGRM550 (LRG)

HRG system: Recommended minimum value

RNGR (tripping level 50 %)

Temperature range –40…+60 °C,

Field calibration at 20 °C

() = Limited temperature range at any field calibration

temperature ±20 K

The temperatures must be within the limits of the operat-

ing temperature range of –40…+70 °C

[for UL applications –40…+60 °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

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 off 48 h

CD1000-2

691…1000V

CD1000 on 300 s

CD1000-2 on or off 48 h

CD5000

1001…4300V CD5000 on or off 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 tripping.

High trip threshold values: the device may not trip

at all

NGRM5xx_D00373_09_Q_XXEN / 02.2024 7

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

operation 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

nominal 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 in-

put 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 se-

lected via the “Trip signal” parameter (menu 6.4.11).

Trip signal 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 independent of the trip signal setting.

On the standard display, the trip signal is indicated

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 off

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 0

Bender GmbH & Co. KG

Londorfer Straße 65

35305 Grünberg

Germany

Tel.: +49 6401 807-0

info@bender.de

www.bender.de

Subject to change! The speciﬁed

standards take into account the edition

valid until 02/2024 unless otherwise

indicated.

Nachdruck und Vervielfältigung nur mit

Genehmigung des Herausgebers.

Reprinting and duplicating only with

permission of the publisher.

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: off

Buzzer test: on

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

EU Declaration of Conformity

The full text of the EU Declaration of Conformity is

available via the QR Code:

UL File Numbers

E493737, E173157

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