Bender NGRM700 User manual

NGRM700
Neutral Grounding Resistor Monitor
NGRM700_D00292_04_M_XXEN/09.2019 Manual EN

Bender GmbH & Co. KG
Londorfer Str. 65 • 35305 Grünberg • Germany
P.O. Box 1161 • 35301 Grünberg • Germany
Tel.: [phone] • Fax: [phone]
E-Mail: [e-mail] • www.bender.de
©Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission of the publisher.
Subject to change!
Photos: Bender archive.

3
Table of Contents
NGRM700_D00292_04_M_XXEN/09.2019
1. Important information ........................................................................... 7
1.1 How to use this manual ................................................................................... 7
1.2 Technical support: service and support .................................................... 8
1.2.1 First level support .............................................................................................. 8
1.2.2 Repair service ...................................................................................................... 8
1.2.3 Field service ......................................................................................................... 8
1.3 Training courses ................................................................................................. 9
1.4 Delivery conditions ........................................................................................... 9
1.5 Inspection, transport and storage ............................................................... 9
1.6 Warranty and liability ....................................................................................... 9
1.7 Disposal ............................................................................................................... 10
2. Safety instructions ............................................................................... 11
2.1 General safety instructions .......................................................................... 11
2.2 Work activities on electrical installations ................................................ 11
2.3 Intended use ..................................................................................................... 11
2.4 Glossary ............................................................................................................... 12
3. Function ................................................................................................. 13
3.1 Device features ................................................................................................. 13
3.2 Functional description ................................................................................... 14
3.3 Recommended minimum value RNGR (tripping level 50 %) .......... 15
3.3.1 Recommended RNGR for system voltage Usys ≤ 4300 V ................ 15
3.3.2 Recommended RNGR for system voltage Usys > 4300 V ................. 16
4. Installation ............................................................................................ 17
4.1 Screw mounting .............................................................................................. 17
4.2 Dimension diagrams ...................................................................................... 17
4.2.1 Dimension diagram FP200-NGRM ........................................................... 17

Table of Contents
4NGRM700_D00292_04_M_XXEN/09.2019
4.2.2 Dimension diagram NGRM700 .................................................................. 18
4.3 Enclosure view .................................................................................................. 19
4.4 Removing FP200-NGRM from enclosure ................................................ 19
4.5 Door mounting ................................................................................................. 20
4.6 Front cover for FP200-NGRM ...................................................................... 20
5. Connection ............................................................................................. 21
5.1 Connection requirements ............................................................................ 21
5.2 Connection descriptions of CD-series coupling device ..................... 22
5.3 Star connection ................................................................................................ 23
5.3.1 Connection Usys ≤ 690 V .............................................................................. 23
5.3.2 Connection Usys ≤ 690 V with pulser ....................................................... 24
5.3.3 Connection Usys > 690 V .............................................................................. 25
5.3.4 Artificial neutral (delta connection) .......................................................... 26
5.4 Measuring current transformer connection .......................................... 26
5.5 Connection of relays (ground-fault, NGR and trip relay) ................... 28
5.6 Connection to the X1 interface .................................................................. 29
5.6.1 X1: Input I1…3 .................................................................................................. 29
5.6.2 X1: Output Q1…2 ............................................................................................ 30
5.6.3 X1: Analogue output ...................................................................................... 31
6. User interface FP200-NGRM ................................................................ 33
6.1 Standard display .............................................................................................. 35
6.2 Fault indication (active) ................................................................................. 35
6.3 Fault indication (inactive) ............................................................................. 36
6.4 Acknowledging a fault message ................................................................ 36
6.5 History memory ................................................................................................ 37
7. Menu ........................................................................................................ 39
7.1 Overview ............................................................................................................. 39
7.2 Navigating through the menu .................................................................... 40
7.3 Changing settings ........................................................................................... 40
7.4 Data measured values (menu 1) ................................................................ 40
7.5 Harmonics (menu 2) ....................................................................................... 41

Table of Contents
5NGRM700_D00292_04_M_XXEN/09.2019
7.6 History (menu 3) .............................................................................................. 42
7.7 Pulser (menu 4) ................................................................................................ 42
7.8 Display (menu 5) .............................................................................................. 43
7.9 HRG settings (menu 6) ................................................................................... 43
7.9.1 HRG system (menu 6.1) ................................................................................. 43
7.9.2 CT (menu 6.2) .................................................................................................... 43
7.9.3 NGR (menu 6.3) ................................................................................................ 44
7.9.4 Phase monitor (menu 6.4) ............................................................................ 44
7.9.5 Response values (menu 6.5) ........................................................................ 44
7.9.6 System settings (menu 6.6) .......................................................................... 47
7.9.7 Field calibration (menu 6.7) ......................................................................... 49
7.10 Device settings (menu 7) .............................................................................. 49
7.11 Commissioning (menu 8) ............................................................................. 54
7.12 Info (menu 9) ..................................................................................................... 54
7.13 Alarm (menu 10) .............................................................................................. 54
8. Initial commissioning ........................................................................... 55
8.1 Response values ............................................................................................... 55
8.2 Output relays operating modes ................................................................. 56
8.2.1 Field calibration ................................................................................................ 56
8.2.2 Trip times ............................................................................................................ 56
8.3 RMS trip signal, fundamental, harmonics ............................................... 59
8.4 Initial measurement ........................................................................................ 59
9. Analogue and digital I/O configuration ........................................... 61
9.1 Analogue output (menu 6.6.4) ................................................................... 61
9.2 Digital outputs (Q1, Q2) ................................................................................ 61
9.2.1 Use of Q1: System condition ...................................................................... 62
9.2.2 Use of Q2: Pulser ............................................................................................. 62
9.3 Digital input ....................................................................................................... 62
10. Test cycle .............................................................................................. 63
11. Factory settings ................................................................................... 65

Table of Contents
6NGRM700_D00292_04_M_XXEN/09.2019
12. Error codes ........................................................................................... 67
13. Technical data ..................................................................................... 69
13.1 Tabular data ....................................................................................................... 69
13.2 Ordering details ............................................................................................... 75
13.2.1 NGR monitor ...................................................................................................... 75
13.2.2 Accessories ......................................................................................................... 76

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NGRM700_D00292_04_M_XXEN/09.2019
1. Important information
1.1 How to use this manual
Always keep this manual within easy reach for future reference. To make it easier
for you to understand and revisit certain sections in this manual, we have used symbols
to identify important instructions and information. The meaning of these symbols is ex-
plained below:
This manual has been compiled with great care. It might nevertheless contain errors
and mistakes. Bender cannot accept any liability for injury to persons or damage to
property resulting from errors or mistakes in this manual.
This manual is intended for qualified personnel working in electrical
engineering and electronics!
This signal word indicates that there is a high risk of danger that will
result in electrocution or serious injury if not avoided.
This signal word indicates a medium risk of danger that can lead to
death or serious injury if not avoided.
This signal word indicates a low-level risk that can result in minor or
moderate injury or damage to property if not avoided.
This symbol denotes information intended to assist the user in making
optimum use of the product.
DANGER
WARNING
CAUTION

Important information
8NGRM700_D00292_04_M_XXEN/09.2019
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers you:
1.2.1 First level support
Technical support by phone or e-mail for all
Bender products
 Questions concerning specific customer applications
 Commissioning
 Troubleshooting
Telephone: [phone]*
Fax: [phone]
In Germany only: 0700BenderHelp (Tel. and Fax)
E-mail: [email protected]
1.2.2 Repair service
Repair, calibration, update and replacement service for Bender products
 Repairing, calibrating, testing and analysing Bender products
 Hardware and software update for Bender devices
 Delivery of replacement devices in the event of faulty or incorrectly delivered Bender
devices
 Extended guarantee for Bender devices, which includes an in-house repair service or
replacement devices at no extra cost
Telephone: [phone]** (technical issues)
[phone]**, -785** (sales)
Fax: [phone]
E-mail: [email protected]
Please send the devices for repair to the following address:
Bender GmbH, Repair-Service,
Londorfer Straße 65,
35305 Grünberg
1.2.3 Field service
On-site service for all Bender products
 Commissioning, parameter setting, maintenance, troubleshooting for Bender
products
 Analysis of the electrical installation in the building (power quality test, EMC test,
thermography)
 Training courses for customers

Important information
9
NGRM700_D00292_04_M_XXEN/09.2019
Telephone: [phone]**, -762 **(technical issues)
[phone]** (sales)
Fax: [phone]
E-mail: [email protected]
Internet: www.bender-de.com
*Available from 7.00 a.m. to 8.00 p.m. 365 days a year (CET/UTC+1)
**Mo-Thu 7.00 a.m. - 8.00 p.m., Fr 7.00 a.m. - 13.00 p.m.
1.3 Training courses
Bender is happy to provide training regarding the use of test equipment.
The dates of training courses and workshops can be found on the Internet at
www.bender-de.com -> Know-how -> Seminars.
1.4 Delivery conditions
Bender sale and delivery conditions apply.
For software products the "Softwareklausel zur Überlassung von Standard-Software als
Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen Lieferbedingungen
für Erzeugnisse und Leistungen der Elektroindustrie" (software clause in respect of the
licensing of standard software as part of deliveries, modifications and changes to gen-
eral delivery conditions for products and services in the electrical industry) set out by
the ZVEI (Zentralverband Elektrotechnik- und Elektronikindustrie e. V.) (German Electri-
cal and Electronic Manufacturer's Association) also applies.
Sale and delivery conditions can be obtained from Bender in printed or electronic for-
mat.
1.5 Inspection, transport and storage
Inspect the dispatch and equipment packaging for damage, and compare the contents
of the package with the delivery documents. In the event of damage in transit, please
contact Bender immediately.
The devices must only be stored in areas where they are protected from dust, damp,
and spray and dripping water, and in which the specified storage temperatures can be
ensured.
1.6 Warranty and liability
Warranty and liability claims in the event of injury to persons or damage to property are
excluded if they can be attributed to one or more of the following causes:
 Improper use of the device.
 Incorrect mounting, commissioning, operation and maintenance of the device.

Important information
10 NGRM700_D00292_04_M_XXEN/09.2019
 Failure to observe the instructions in this operating manual regarding transport, com-
missioning, operation and maintenance of the device.
 Unauthorised changes to the device made by parties other than the manufacturer.
 Non-observance of technical data.
 Repairs carried out incorrectly and the use of replacement parts or accessories not
approved by the manufacturer.
 Catastrophes caused by external influences and force majeure.
 Mounting and installation with device combinations not recommended by the manu-
facturer.
This operating manual, especially the safety instructions, must be observed by all per-
sonnel working on the device. Furthermore, the rules and regulations that apply for ac-
cident prevention at the place of use must be observed.
1.7 Disposal
Abide by the national regulations and laws governing the disposal of this device. Ask
your supplier if you are not sure how to dispose of the old equipment.
The directive on waste electrical and electronic equipment (WEEE directive) and the di-
rective on the restriction of certain hazardous substances in electrical and electronic
equipment (RoHS directive) apply in the European Community. In Germany, these pol-
icies are implemented through the "Electrical and Electronic Equipment Act" (ElektroG).
According to this, the following applies:
 Electrical and electronic equipment are not part of household waste.
 Batteries and accumulators are not part of household waste and must be disposed of
in accordance with the regulations.
 Old electrical and electronic equipment from users other than private households
which was introduced to the market after 13 August 2005 must be taken back by the
manufacturer and disposed of properly.
For more information on the disposal of Bender devices, refer to our homepage at
www.bender-de.com -> Service & support.

11
NGRM700_D00292_04_M_XXEN/09.2019
2. Safety instructions
2.1 General safety instructions
Part of the device documentation in addition to this manual is the enclosed " Safety in-
structions for Bender products".
2.2 Work activities on electrical installations
If the device is used outside the Federal Republic of Germany, the applicable local
standards and regulations must be complied with. The European standard EN 50110
can be used as a guide.
2.3 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.
Only qualified personnel are permitted to carry out the work necessary to
install, commission and run a device or system.
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.
DANGER

Safety instructions
12 NGRM700_D00292_04_M_XXEN/09.2019
In order to meet the requirements of applicable standards, the equipment must be ad-
justed to local equipment and operating conditions by means of customised parameter
settings. Please heed the limits of the range of application indicated in the technical da-
ta.
Any other use than that described in this manual is regarded as improper. Intended use
includes following all the instructions in this operating manual.
2.4 Glossary
CD Coupling Device CD-series
CT Current Transformer
FFT Fast Fourier Transformation
HMI Human Machine Interface, display unit
HRG High Resistance Grounding
INGR NGR rated current
INGR nom Nominal current through the NGR
NER Neutral Earthing Resistor (NER = NGR)
NGR Neutral Grounding Resistor
NTP Network Time Protocol
PT Potential Transformer
RNGR NGR resistance value
RNGR nom NGR nominal resistance
RS Sense resistor; CD-series coupling device
PLC Programmable Logic Controller
UNGR Voltage on the NGR
UNGR nom Nominal voltage across the NGR
Usys System voltage
UTC Universal Time Coordinated
Systems with a high-resistance grounded star point can be used when an
interruption of the power supply would involve excessive costs due
to production stoppage (e.g. automotive production, chemical
industry). The ground fault that occurs between a phase and earth does
not lead to a failure of the power supply in these systems. A ground fault
must be detected and eliminated as quickly as possible, since the
occurrence of another ground fault in a second phase would lead to a
tripping of the overcurrent protective device.

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NGRM700_D00292_04_M_XXEN/09.2019
3. Function
3.1 Device features
 Determination of RNGR with passive and active measurement methods
 Continuous monitoring of the RNGR even if the installation is de-energised;
 Alarm or trip on ground fault
 Monitoring of the current INGR
 Monitoring of the voltage UNGR
 Phase-to-ground fault indication (optional; up to 690 V direct coupling, otherwise via
potential transformers)
 Ethernet communication
 Web server
 Language selection (German, English GB and US, Spanish, French)
 Test button (internal, external) with/without tripping
 FFT analysis of the measuring signals
 Pulser for manual ground fault location
 Relay for detection of ground faults and resistor faults
 Relay for shutdown of the installation after a configurable time
 Can be combined with RCMS… for automatic shutdown of feeders
 Graphical user interface
 Wide supply voltage range (24 to 240 Vac/Vdc)
 Range of use up to 5000 m AMSL
 Fault/History memory
 Analogue output of measured values (0…10 V, 4…20 mA, selectable parameters)
 Detachable HMI for door mounting
 Password protection
 Tripping on RMS, fundamental component signal or harmonics
 Detection of AC and DC ground faults

Function
14 NGRM700_D00292_04_M_XXEN/09.2019
3.2 Functional description
The NGRM700 monitors NGR resistance RNGR, neutral voltage UNGR and current INGR.
NGR resistance is monitored using an active and a passive procedure:
active The device generates an active test pulse and measures RNGR even
if the installation is de-energised.
passive Only for energised installations: The resistance RNGR is determined
when INGR or UNGR exceeds an internal threshold. The device meas-
ures the existing current and voltage and calculates RNGR.
In the case of the "auto" method, monitoring switches automatically between "active"
and "passive" when the measured value exceeds or falls below the internal threshold.
The threshold is 15 % of the nominal value and can be adjusted by Bender service if re-
quired.
A short circuit or interruption of the NGR is reliably detected in an energised as well as
a de-energised installation with the active measurement method.
When the "passive" method is selected, no switching of the monitoring takes place. No
monitoring of the NGR occurs while the installation is de-energised.
The NGR relay switches from alarm state to operating state when the measured resist-
ance RNGR is within the configured thresholds.
A ground fault is signalled via the corresponding ground-fault relay when INGR or UNGR
exceeds the selectable thresholds. After the adjustable time delay has elapsed, the in-
stallation can be shut down by means of the trip relay.
A connection to installations ranging from 400 V…25 kV is possible via the appropriate
CD-series coupling device.
The INGR is measured with (universal) measuring current transformers for 5 A or 50
mA secondary. With the ratio of the used measuring current transformer the current
measurement is internally set in such a way that it adjusts best to INGR.
The phase-voltage monitoring function can be used to indicate which phase has the
ground fault. Direct coupling is possible up to a system voltage of 690 V. For higher volt-
ages, use potential transformers (PT). The ratio is adjustable.

Function
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NGRM700_D00292_04_M_XXEN/09.2019
3.3 Recommended minimum value RNGR (tripping level 50 %)
Temperature range –40…+70 °C, field calibration at 25 °C
(Limited temperature range 0…+40 °C, field calibration at 25 °C)
3.3.1 Recommended RNGR for system voltage Usys ≤ 4300 V
Tab. 3.1: Recommended RNGR for system voltage Usys ≤ 4300 V
CD1000/CD1000-2 CD1000-2 CD5000
Usys 400 V 600 V 690 V 1000 V 2400 V 4200 V
INGR
1 A 231  346  398  577  1386  —
5 A 46  69  80  115  277  485 
10 A (23 Ω) 35  40  58  139  242 
15 A (15 Ω) (23 Ω) (27 Ω) 38  92  162 
20 A —(17 Ω) (20 Ω) 29  69  121 
25 A ——(16 Ω) (23 Ω) 55  97 
30 A ———(19 Ω) (46 Ω) 81 
40 A ————(35 Ω) 61 
50 A ————(28 Ω) (48 Ω)
100 A ———— —(24 Ω)

Function
16 NGRM700_D00292_04_M_XXEN/09.2019
3.3.2 Recommended RNGR for system voltage Usys > 4300 V
Tab. 3.2: Recommended RNGR for system voltage Usys > 4300 V
CD14400 CD25000
Usys 6000 V 6600 V 7200 V 11000 V 14400 V 25000 V
INGR
1 A ——————
5 A 693  762  831  1270  1663  —
10 A 346  381  416  635  831  1443 
15 A 231  254  277  423  554  962 
20 A (173 Ω) 191  208  318  416  722 
25 A (139 Ω) (152 Ω) (166 Ω) 254  333  577 
30 A (115 Ω) (127 Ω) (139 Ω) 212  277  481 
40 A (87 Ω) (95 Ω) (104 Ω) (159 Ω) 208  361 
50 A —(76 Ω) (83 Ω) (127 Ω) (166 Ω) 289 
100 A ————(83 Ω) (144 Ω)

17
NGRM700_D00292_04_M_XXEN/09.2019
4. Installation
4.1 Screw mounting
Fix the NGRM700 with four M4 screws (see dimension diagram NGRM700).
4.2 Dimension diagrams
4.2.1 Dimension diagram FP200-NGRM
Fig. 4.1: Dimension diagram FP200-NGRM
Only qualified personnel are permitted to carry out the work necessary to
install, commission and run a device or system.
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.
DANGER
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

Installation
18 NGRM700_D00292_04_M_XXEN/09.2019
4.2.2 Dimension diagram NGRM700
Fig. 4.2: Dimension diagram and mounting position NGRM700
a
k
j
i
hgf
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
6 0.236
Mounting position
top

Installation
19
NGRM700_D00292_04_M_XXEN/09.2019
4.3 Enclosure view
Fig. 4.3: Enclosure view
4.4 Removing FP200-NGRM from enclosure
Fig. 4.4: Removing FP200-NGRM from enclosure
A1 A2 11 12 14 21 22 24 31 32 34 L1 L2 L3
RSE 5A C 50mA
X1 Ethernet
R on/off
SERVICE
TRIPPED
NGR FAULT
GROUND FAULT
ON MENU
RESET
DATAINFO
*
<
<
<
<
OK
ESC
TRIPPED
NGR FAULT
GROUND FAULT
ON
FP200
TEST
NGRM700
LINETRAXX ®
Top
Front
Bottom
PH 1
1
2
X1 ETH R
X1 ETH R
OFFON

Installation
20 NGRM700_D00292_04_M_XXEN/09.2019
4.5 Door mounting
Fig. 4.5: Door mounting
4.6 Front cover for FP200-NGRM
When installed in doors, the degree of protec-
tion of the FP200-NGRM operator unit can be
increased to IP65 by means of the transparent
front plate cover (B98060005).
Place the front cover over the yellow front of
the FP200-NGRM before installing it.
123
45
*IP 65:
68+0.7/-0 mm
max. 5.3 mm
138+0.5/-0 mm
66+0.5/-0 mm*
0.3 Nm ± 10 %
RJ45:
Remote
RJ45:
Ethernet
TRIPPED
NGRFAULT
GROUNDFAULT
ON
SERVICE
TRIPPED
NGRFAULT
GROUNDFAULT
ON MENU
RESET
DATAINFO
<
<
<
<
OK
ESC
TEST
Remote:
max. 5 m
Switch
B98060005