Bender NGRM700 User manual

Quick-start guide ENNGRM700_D00292_03_Q_XXEN/09.2019
NGRM700
Neutral grounding resistor monitor

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 NGRM700 is only intended for use in high-resistance grounded systems. In these systems, the
NGRM700 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,
• 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/manuals
PH 1
1
2
X1 ETH R
max. 5 m
Switch
RJ45:
Remote
RJ45:
Ethernet
Connection to the X1 interface
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 condition (system health)
+Output for supply of external relays (+24V, max. 100 mA)
X1 ETH R
OFF ON
Removing FP200-NGRM from enclosure
I1
I2
I3
A
B
M+
Q2
Q1
+
2 NGRM700_D00292_03_Q_XXEN/09.2019
NGRM700

a
k
j
i
hg
f
e
d
cb
l
3
55.50
61.40
63.35
150
125
230
245
205
223.50
211
a
k
j
i
h
g
f
e
d
c
b
l
0.12
2.19
2.42
2.49
5.91
4.92
9.06
9.65
8.07
8.80
8.31
mm in
60
.236
Mounting position
top
5.43+0
.02/-0
i
n
138+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
Dimension diagram NGRM700 and FP200-NGRM
a
f
e
d
c
b
a
f
e
d
c
b
mm in
135,5
65,5
35,6
144
72
5,8
5,33
2,58
1,40
5,67
2,83
0,23
k
l
AC/DC
24...240 V
6 A6 A
A1
A2
L1 L2 L3
RS
E
C
50mA
5A
NGR
NGRM700
CT
Rs (G1)
E (G)
N
CD...
31 32 3421 22 24
11 12 14
FP200-NGRM
X1
Dig. IN/OUT Ethernet
PT *
L1
L2
L3
NGR
fault
Ground
fault Trip
Circuit breaker (for tripping systems)
k
l
AC/DC
24...240 V
6 A6 A
A1
A2
L1 L2 L3
RS
E
C
50mA
5A
NGR
NGRM700
CT
Rs (G1)
E (G)
N
CD...
31 32 3421 22 24
11 12 14
FP200-NGRM
X1
Dig. IN/OUT Ethernet
6 A6A6A
L1
L2
L3
NGR
fault
Ground
fault Trip
Circuit breaker (for tripping systems)
Connection ≤ 690 V Connection > 690 V
The “N” connection of the CD-series coupling device should
be as close to the transformer star point as possible. * PT ratio can be selected
on the NGRM700
NGRM700
NGRM700_D00292_03_Q_XXEN/09.2019 3

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:
System type AC + DC AC AC
INGR 1…10 A 5…25 A 5…25 A
Frequency response range 0…3800 Hz 42…3800 Hz 50/60 Hz
Bender CT Ratio 600:1 600:1 60:5
Connecting cable max. 10 m (provided cable
or cable of 0.75…1.5 mm²/
AWG18…16)
max. 40 m (provided cable
or cable of 0.75…1.5 mm²/
AWG18…16)
max. 25 m (4 mm²/AWG12)
max. 40 m (6 mm²/AWG 10)
IΔn
(Currents detected)
AC, pulsed AC, DC AC, pulsed AC AC, pulsed AC
Type
Bender CT
W35…120AB
kl
W...AB
AN420
W20…120
W1-S35…W5-S210
W...
W...S...
kl
kl
CTB31…41
kl
CTB
CT: Terminal k NGRM700: 50 mA NGRM700: 50 mA NGRM700: 5 A
CT: Terminal l NGRM700: CNGRM700: CNGRM700: 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 NGRM700_D00292_03_Q_XXEN/09.2019
NGRM700

Menu structure
1. Data meas. values
4. Pulser
3. History
5. Display
9. Info
History, Delete
Pulser, tImpuls
RNGR, INGR
HRG system
CT
NGR
Phase
monitor
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, UL1L2, UL2L3,
UL3L1, f, U1-E rms, U2-E rms, U3-E rms, T
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
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
NGRM700_D00292_03_Q_XXEN/09.2019 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… cou-
pling 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 NGRM700_D00292_03_Q_XXEN/09.2019
NGRM700

1. Setting the response values (menu 6.5)
• 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 6.6)
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 6.7)
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.
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
NGRM700
NGRM700_D00292_03_Q_XXEN/09.2019 7

Factory settings
Menu 6.1: HRG system 2. PT primary 1 Menu 6.6: System settings
1. Usys (L-L) 400V 3. PT secondary 1 1. Ground-fault relay Mode: Fail-safe
2. CD-NGRM CD1000 Menu 6.5: Response values Relay test: on
3. Frequency 50 Hz 1. UNGRTrip 60 % 2. NGR relay Mode: Fail-safe
4. INGR nom 5 A 2. INGRTrip 60 % Relay test: on
5. RNGR nom 470 Ω 3. > RNGR 150 % 3. Trip relais Mode: Fail-safe
Menu 6.2: CT 4. < RNGR 50 % Relay test: on
1. CT primaryr 600 5. tNGRTrip 0 s 4. Analogue Mode: 4-20 mA
2. CT secondary 1 6. Ground fault trip ja Function: R NGR
3. CT connection 50 mA 7. tGFTrip 5 s
5. Dig. in/out
System OUT: Fail-safe
Menu 6.3: NGR 8. Alarm stored on Pulser OUT: Non-fail-safe
1. Method auto 9. trestart 5 s Pulser IN: Active high
2. PT primary 1 10. Restart count 2 RESET IN: Active high
3. PT secondary 1 11.Trip Signal RMS TEST IN: Active high
Menu 6.4: Phase monitor 12. Upper limit harmonic 32 6. Buzzer Buzzer alarm: o
1. Phase monitor on 13. Lower limit harmonic 0 Buzzer test: on
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 Gruenberg • Germany
Londorfer Str. 65 • 35305 Gruenberg • 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 2081 appl.)..............AC/DC, 48…230 V
> 2000… ≤ 5000 m..................................AC/DC, 24…120 V
> 2000… ≤ 5000 m (for UL and AS/NZS 2081 appl.)..............
.........................................AC/DC, 48…120 V
Tolerance Us......................................................................±15 %
Tolerance Us(for UL applications).........................–50…+15 %
Tolerance Us(for AS/NZS 2081 appl.)....................–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, 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 appl.) .................. 3 A/3 A
Rated operational current 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