Bender NGRM700 User manual

Quick-start guide ENNGRM7xx_D00292_07_Q_XXEN/11.2022
NGRM700 (HRG)
NGRM750 (LRG)
Neutral Grounding Resistor Monitor (NGR)

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.
Intended use
The NGRM700 is only intended for use in high-resistance
grounded systems. The NGRM750 is only intended for
use in low-resistance grounded systems. In these sys-
tems, the NGRM7… 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,
• line-to-line and line-to-earth voltages.
This quick-start guide does not replace the operating
manual of the device. Download: www.bender.de/manu-
als
Connection X1
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)
I1
I2
I3
A
B
M+
Q2
Q1
+
Removing the FP200-NGRM
PH 1
1
2
X1 ETH R
max. 5 m
Switch
RJ45:
Remote
RJ45:
Ethernet
X1 ETH R
OFF ON
Quick-start guide for
Type Supply voltage/Frequency range USArt. No. Manual
NGRM700 AC 24…240V, 40…70 Hz
DC 24…240V
B94013700 D00292
NGRM750 B94013750
2 NGRM7xx_D00292_07_Q_XXEN/11.2022
NGRM700 (HRG), NGRM750 (LRG)

Dimension diagram basic device
55.50 (2.19)
230 (9.06)
211 (8.31)
205 (8.07)
150 (5.91)
125 (4.92)
223.50 (8.80)
ø 6 (0.236)
3 (0.12)
63.35 (2.49)
61.40 (2.42)
245 (9.65)
Mounting
position:
Top
Connection ≤ 690 V
i
The "N" connection of the CD-series coupling device
should be as close to the transformer star point as
possible.
k
l
NGR
CT
Rs(G1)
E (G)
N
CD...
PEPE
L1
L2
L3
L1 L2 L3
6A 6A 6A
LINETRAXX®
NGRM7…
X1
Ethernet
RS
E
5
C
50m
A1
A2
6A
AC/DC
48...240 V
6A
11 12 14 21 22 24 31 32 34
Circuit breaker
NGR faultGround fault Trip
Connection > 690 V
k
l
NGR
CT
R
s
(G1)
E (G)
N
CD...
PE
L1
L2
L3
L1 L2 L3
6A 6A 6A
PT *
LINETRAXX®
NGRM7…
X1
Ethernet
RS
E
5
C
50m
A1
A2
6A
AC/DC
48...240 V
6A
11 12 14 21 22 24 31 32 34
Circuit breaker
NGR faultGround fault Trip
* PT ratio "primary: secondary" can
be adjusted in the NGRM7…
Dimension diagram FP200-NGRM
5.
43+
0
,02/-0
i
n
1
38+0,
5/
-
0 mm
2.60+0,02/-0 in*
66+0,5/-0 mm*
ma
x
.
5
,
3
m
m
* IP 65:
68+0,7/-0 mm
2,68+0,03/-0 in
max. 0,21 in
144 (5.67)
135.5 (5.33)
5.8 (0.23)
35.6 (1.40)
65.5 (2.58)
72 (2.83)
NGRM700 (HRG), NGRM750 (LRG)
NGRM7xx_D00292_07_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 of
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 Every standard current
transformer can be used.
CT: terminal k NGRM7…: 50 mA NGRM7…: 50 mA NGRM7…: 5 A NGRM7…: 5 A
CT: terminal l NGRM7…: CNGRM7…: CNGRM7…: CNGRM7…: C
24 V
S1(k) S2(l)
CTUB103
WS…
kl
kl
CTAC…
kl
CTB
4 NGRM7xx_D00292_07_Q_XXEN/11.2022
NGRM700 (HRG), NGRM750 (LRG)

Menu overview
1. Data meas. values
4. Pulser
3. History
5. Display
9. Info
History, Delete
Pulser, tImpuls
RNGR, INGR
HRG/LRG
system
CT
NGR
Phase
monitor
Field calibration
Usys (L-L), CD-NGRM, 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, UL1L2, UL2L3,
UL3L1, f, U1-E rms, U2-E rms, U3-E rms, T
6. HRG/LRG 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
Mode, Relay test
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
Phase monitor, 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
NGRM700 (HRG), NGRM750 (LRG)
NGRM7xx_D00292_07_Q_XXEN/11.2022 5

HRG system: Recommended minimum value
RNGR (tripping level 50 %)
Temperature range –40…+70 °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)
Maximum trip times tGF Trip for the CD-NGRM
used
The setting for tGF trip may 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 6.5):
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 6.5)
• Trip threshold for voltage (UNGR trip)
• Trip threshold for current (INGR trip)
• Trip threshold for resistance (RNGR)
i
Low trip threshold values:
may lead to false tripping.
High trip threshold values: the device may not trip
at all
() = 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 NGRM7xx_D00292_07_Q_XXEN/11.2022
NGRM700 (HRG), NGRM750 (LRG)

2. System settings of the relays (menu 6.6)
The factory setting for the relays is fail-safe.
In the case of a test, the relays change state.
i
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 6.7)
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 ac-
curacy, start the device and let it run for at least one hour
in the operating environment before carrying out the
field calibration.
i
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 (see
manual).
The trip relay is switched during field calibration!
4. RMS trip signal, fundamental frequency, har-
monics
The measured value which causes tripping can be select-
ed via the "Trip signal" parameter (menu 6.5.11). 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
i
In the "Harmonics" measured value display (menu
2) all spectral lines are always displayed. This is in-
dependent of the trip signal setting.
i
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 470 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: Phase monitor
1. Phase monitor on
2. PT primary 1
3. PT secondary 1
Menu 6.5: Response values
HRG LRG
1. UNGRTrip 60 %
2. INGRTrip 60 %
3. > RNGR
150 % (HRG),
250 Ω (LRG)
4. < RNGR (HRG only) —50 %
5. tNGR trip 4. tNGRTrip 0 s
6. Ground-fault trip 5. Ground-fault trip yes
7. tGFTrip 6. tGFTrip 5 s
8. Alarm stored 7. Alarm stored on
9. trestart 8. trestart 5 s
10. Max. no. of restarts 9. Max. no. of 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
NGRM700 (HRG), NGRM750 (LRG)
NGRM7xx_D00292_07_Q_XXEN/11.2022 7

Menu Factory settings
Menu 6.6: 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
NGRM700 (HRG), NGRM750 (LRG)
Alle Rechte vorbehalten.
Nachdruck und Vervielfältigung
nur mit Genehmigung des Herausgebers.
Bender GmbH & Co. KG
Postfach 1161 • 35301 Grünberg • Deutschland
Londorfer Str. 65 • 35305 Grünberg • Deutschland
Tel.: [phone] • Fax: [phone]
E-mail: [email protected] • www.bender.de
All rights reserved.
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.: [phone] • Fax: [phone]
E-mail: [email protected] • www.bender.de
Technical data
Rated voltage.....................................................................................690 V
Overvoltage category...............................................................................III
Nominal supply voltage Us
≤ 2000 m ..................................................................AC/DC, 24…240 V
≤ 2000 m (for UL applications) .................................AC/DC, 48…240 V
≤ 2000 m (for AS/NZS 208 applications)...................AC/DC, 48…230 V
2000…5000 m.........................................................AC/DC, 24…120 V
2000…5000 m (for UL and AS/NZS 2081 applications).........................
AC/DC, 48…120 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 (typ. 50/60 Hz)................................. ≤ 6.5 W / 13 VA
Switching elements (ground-fault, NGR-fault, and 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
UL File Numbers
E493737, E173157