Bender NGRM500 User manual

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
OK
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))
93
(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
1.
2.
4.
„Klick“
3a.
3c.
3b.
2 NGRM500_D00373_03_Q_XXEN/03.2020
NGRM500

Connection X1
I1
I2
I3
A
B
M+
Q2
Q1
+
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
k
l
AC/DC
24...240 V
6 A6 A
NGR
CT
Rs (G1)
E (G)
N
CD...
L1
L2
L3
N
NGR
fault
Ground
fault Trip (optional trip circuit)
Circuit breaker
(for tripping systems)
A1
A2
RS
E
C
50m
5
31 32 3421 22 24
11 12 14
X1 Ethernet
NGRM500
PE
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
kl
W...AB
AN420
24 V
S1(k) S2(l)
CTUB103
W20…120
W1-S35…W5-S210
W...
W...S...
kl
kl
CTB31…41
kl
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...
C
50mA
lk
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
CT
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
Earth fault relay
NGR relay
Trip relay
Analogue
Digital in/out
Buzzer
Mode, Relay test
Mode, Relay test
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)
i
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.
i
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)
i
In the "Harmonics" measured value display (menu 2) all frequencies are always displayed. This
is independent of the trip signal setting.
i
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.: [phone] • [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
All rights reserved.
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