Megger SmartFuse 250 User manual

1
SFC250
SmartFuse 250
USER GUIDE
Issue: C (12/2020) - EN
Article number: 85431

2

Consultation with Megger
3
Consultation with Megger
The present system manual has been designed as an operating guide and for reference.
It is meant to answer your questions and solve your problems in as fast and easy a way
as possible. Please start with referring to this manual should any trouble occur.
In doing so, make use of the table of contents and read the relevant paragraph with great
attention. Furthermore, check all terminals and connections of the instruments involved.
Should any question remain unanswered or should you need the help of an authorized
service station, please contact:
Megger Limited Megger Germany GmbH (Baunach)
Archcliffe Road
Kent CT17 9EN
T: [phone]
F: [phone]
E: [e-mail]
Dr.-Herbert-Iann-Str. 6
D - 96148 Baunach
T: [phone] – 0
F: [phone]
E: [e-mail]
Megger Germany GmbH (Radeburg) Megger USA
Röderaue 41
D - 01471 Radeburg / Dresden
T: [phone] – 0
F: [phone]
E: [e-mail]
Valley Forge Corporate Centre
2621 Van Buren Avenue
Norristown, PA 19403 USA
T: [phone]
F: [phone]
Megger
All rights reserved. No part of this handbook may be copied by photographic or other means unless Megger
have before-hand declared their consent in writing. The content of this handbook is subject to change without
notice. Megger cannot be made liable for technical or printing errors or shortcomings of this handbook. Megger
also disclaims all responsibility for damage resulting directly or indirectly from the delivery, supply, or use of this
matter.

Terms of Warranty
4
Terms of Warranty
Megger accept responsibility for a claim under warranty brought forward by a customer
for a product sold by Megger under the terms stated below.
Megger warrant that at the time of delivery Megger products are free from manufacturing
or material defects which might considerably reduce their value or usability. This warranty
does not apply to faults in the software supplied. During the period of warranty, Megger
agree to repair faulty parts or replace them with new parts or parts as new (with the same
usability and life as new parts) according to their choice.
This warranty does not cover wear parts, lamps, fuses, batteries and accumulators.
Megger reject all further claims under warranty, in particular those from consequential
damage. Each component and product replaced in accordance with this warranty
becomes the property of Megger.
All warranty claims versus Megger are hereby limited to a period of 12 months from the
date of delivery. Each component supplied by Megger within the context of warranty will
also be covered by this warranty for the remaining period of time but for 90 days at least.
Each measure to remedy a claim under warranty shall exclusively be carried out by
Megger or an authorized service station.
This warranty does not apply to any fault or damage caused by exposing a product to
conditions not in accordance with this specification, by storing, transporting, or using it
improperly, or having it serviced or installed by a workshop not authorized by Megger. All
responsibility is disclaimed for damage due to wear, will of God, or connection to foreign
components.
For damage resulting from a violation of their duty to repair or re-supply items, Megger
can be made liable only in case of severe negligence or intention. Any liability for slight
negligence is disclaimed.
Since some states do not allow the exclusion or limitation of an implied warranty or of
consequential damage, the limitations of liability described above perhaps may not apply
to you.

Contents
5
Contents
Consultation with Megger .............................................................................................3
Terms of Warranty .........................................................................................................4
Contents .........................................................................................................................5
1General Notes .................................................................................................7
2Technical description.....................................................................................9
2.1 Abbreviations....................................................................................................9
2.2 System description .........................................................................................10
2.3 Technical data ................................................................................................13
2.4 Connections, controls and display ..................................................................15
2.4.1 Information plate .............................................................................................20
3User interface................................................................................................21
3.1 Access to the user interface............................................................................21
3.1.1 Local operation ...............................................................................................21
3.1.2 Access through a web browser.......................................................................22
3.2 The main screen.............................................................................................23
3.2.1 Main screen layout in EasyGo mode ..............................................................25
3.2.2 Main screen layout in Expert mode.................................................................27
4Configuration ................................................................................................29
4.1 Device and communication settings ...............................................................29
4.1.1 Defining basic settings....................................................................................29
4.1.2 Modifying the notification and network settings...............................................32
4.1.2.1 Modifying the notification settings...................................................................32
4.1.2.2 Modifying WLAN and LAN settings.................................................................33
4.1.2.3 Ensuring Internet accessibility ........................................................................35
4.1.2.4 Specifying the outgoing mail server................................................................38
4.1.3 Pairing the remote control...............................................................................39
4.2 Fuse parameters and cable data ....................................................................41
4.2.1 Configuring the shutdown and reclose behaviour...........................................41
4.2.2 Entering cable data and adjusting the fault location settings ..........................43
5Using the remote control .............................................................................47
6Comissioning................................................................................................49
6.1 Installation on site ...........................................................................................49
6.2 Completing switch-on and commissioning......................................................54
7Controlling and monitoring in running operation......................................57
7.1 Monitoring, analysis and fault location ............................................................57
7.2 Fault pinpointing .............................................................................................63
8Deinstallation ................................................................................................66

Contents
6
9Maintenance and care ..................................................................................67
9.1 Updating the firmware.....................................................................................67
9.2 Cleaning the vants of the power modules.......................................................70
9.3 Replacing fuses in power modules .................................................................71
9.4 Calibrating the touch screen of the supply module .........................................73
10 Troubleshooting ...........................................................................................75

General Notes
7
1General Notes
This manual contains basic instructions for the commissioning and operation of the device
/ system. For this reason, it is important to ensure that the manual is always available to
the authorised and trained operator. He needs to read the manual thoroughly. The
manufacturer is not liable for damage to material or humans due to non-observance of
the instructions and safety advices provided by this manual.
Locally applying regulations have to be observed!
The following signal words and symbols are used in this manual and on the product itself:
Signal word /
symbol
Description
DANGER Indicates a potential hazard which will result in death or serious
injury if not avoided.
WARNING Indicates a potential hazard which may result in death or
serious injury if not avoided.
CAUTION Indicates a potential hazard which may result in moderate or
minor injury if not avoided.
NOTICE Indicates a potential hazard which may result in material
damage if not avoided.
Serves to highlight warnings and safety instructions.
As a warning label on the product it is used to draw attention to
potential hazards which have to be avoided by reading the
manual.
Serves to highlight warnings and safety instructions that
explicitly indicate the risk of an electric shock.
Serves to highlight important information and useful tips on the
operation of the device/system. Failure to observe may lead to
unusable measurement results.
It is important to observe the generally applicable electrical regulations of the country in
which the device will be installed and operated, as well as the current national accident
prevention regulations and internal company directives (work, operating and safety
regulations).
After working on the system, it must be voltage-free and secured against reconnection as
well as having been discharged, earthed and short-circuited.
Use genuine accessories to ensure system safety and reliable operation. The use of other
parts is not permitted and invalidates the warranty.
Safety precautions
Labelling of safety
instructions
Working with products
from Megger

General Notes
8
The system may only be installed and operated by an authorised electrician. DIN VDE
0104 (EN 50191), DIN VDE 0105 (EN 50110) and the German accident prevention
regulations (UVV) define an electrician as someone whose knowledge, experience and
familiarity with the applicable regulations enables him to recognise potential hazards.
Anyone else must be kept away!
The product meets the following security requirements of the European Council
Directives:
•EMC Directive (2004/108/EC)
•Low Voltage Directive (2006/95/EC)
•RoHS Directive (2011/65/EU)
This product includes software components that are covered by the GNU Lesser General
Public License (LGPL). You are hereby granted the right to request the source code of
the following components licensed according to LGPL v.2.1, modify it and distribute it:
•Libroxml 2.3.0
•GNU C Library 2.19
•Qt 5.4.0
The operating safety is only guaranteed if the delivered system is used as intended (see
page 10). Incorrect use may result in danger to the operator, to the system and the
connected equipment.
The thresholds listed in the technical data may not be exceeded under any circumstances.
The equipment may only be used when working properly. When irregularities or
malfunctions appear that cannot be solved consulting this manual, the equipment must
immediately be put out of operation and marked as not functional. In this case inform the
person in charge who should inform the Megger service to resolve the problem. The
instrument may only be operated when the malfunction is resolved.
Operating staff
Declaration of
Conformity (CE)
Use of LGPL software
Intended application
Behaviour at
malfunction of normal
operation

Technical description
9
2Technical description
2.1 Abbreviations
The following abbreviations are used in this manual:
APN Access Point Name
CSV Comma-separated values
DHCP Dynamic Host Configuration Protocol
(network communication protocol)
GPS Global Positioning System
GSM Global System for Mobile Communications
LAN Local Area Network
M2M Machine-to-Machine
LH Niederspannungs-Hochleistungs-Sicherung (low-voltage high-power fuse)
SIM Subscriber Identity Module
SMS Short Message Service
SSID Service Set Identifier
(ID / name of a wireless network)
UMTS Universal Mobile Telecommunications System
URL Uniform Resource Locator
VPN Virtual Private Network
WLAN Wireless Local Area Network
WPA Wi-Fi Protected Access
(encryption method for a wireless network)

Technical description
10
2.2 System description
The use of the SmartFuse 250 (SFC250) allows the low-voltage power supply to be safely
disconnected and automatically restored in the event of faults and overload. The
possibility to configure how often and how fast the power network is reconnected and to
be informed about any events increases the reliability and stability of the power supply for
consumers and minimises downtime.
To this end, the SFC250 is inserted into the fuse holder (sizes NH 2 and NH 3; fuse value
≤250 A) in place of the normal NH fuse link.
Single-phase installation Three-phase installation
After successful installation and configuration the SFC250 behaves similar to a normal
fuse element. Unlike a normal fuse, after being tripped, the SFC250 can switch the fused
circuit back on if desired (after an adjustable waiting time).
The consumer does not, as is the case for classic fault location using high voltage, have
to be completely disconnected from the power supply network. This is often not even
possible, for example because the residents are not accessible, leading to a risk of
property damage to the household appliances and building wiring. Instead, the pre-
location of detected faults can be carried out under voltage directly with the internal
location algorithm.
To pinpoint the location of a fault (using an acoustic ground microphone or the
FaultSniffer), the SFC250 can be set to 'automatic reactivation' mode. With faults that can
be triggered reliably, this mode causes continuous arcing at the fault location. To keep
the load on the equipment and consumers as low as possible, automatic reactivation can
be enabled and disabled directly from the suspected fault location via a mobile device
(GSM connection) or the remote control SFC250-RC.
Alternative corrective actions, which require the use of a test van, can be scheduled with
some lead time, because in most cases the SFC250 can maintain the supply of the fused
network section for a certain period.
Intended use

Technical description
11
The SFC250 combines the following features in one device:
•Intelligent monitoring of the low-voltage network
•Minimised downtimes
•Cable fault location with households connected
•Safe installation in the distribution box
•Intuitive user interface
•Variable control via Touchscreen, Smartphone, Tablet, PC or remote control
•Monitoring of up to three phases with one supply module
The delivery scope includes at least the following components:
Quantity Component Description Item number
1 … 3 Power module
SFC250-PM
Fuse unit incl. Thyristor switch and
measuring technology
1005787
1 Supply module
SFC250-SM
Control and processing unit incl.
communication interfaces
1005924
1 Remote control
SFC250-RC
Incl. antenna and batteries 1006110
1 Connection cable,
black/blue
1.5 m long line with alligator clip for
connecting to the neutral conductor
2012921
1 Plug-in power
adapter
Universal power supply
(90 … 264 VAC; 12 VDC / 2.08 A)
for configuration of the device in the
office
90025083
1 Transport case 90014263
10 Fuse F1.25 A / 500 V, 6.3x32 mm,
breaking capacity: 50 kA
90013082
1 Manual 85431
Check the contents of the package for completeness and visible damage right after
receipt. In the case of visible damage, the device must under no circumstances be taken
into operation. If something is missing or damaged, please contact your local sales
representative.
Features
Scope of delivery
Check contents

Technical description
12
The following optional accessories can also be ordered from the sales department if
required:
Accessory Description Item number
Upgrade kit
SFC 250-1-2-VS
To upgrade a single-phase set to a two-
phase
set
1010753
Upgrade kit
SFC 250-1-3-VS
To upgrade a single-phase set to a three-
phase set
1010754
"Fault location" option
SFC 250-FL
Automatic fault location with display of the
determined distance and external trigger
output
90015840
SFC 250-CA Adapter for connecting up to three power
modules to a supply module
1009649
Additional emergency
backup
Size: SQB1 (with flush end connections);
rated breaking capacity: 200 kA (AC 700 V)
90007524
External GPS receiver
SFC 250-GPS
Incl. cable (approx. 3 m) 2007960
SFC 250-HC Robust and waterproof 7“ tablet for remote
control of the SFC250
1008357
Fork adapter
SFC 250-GA
Adapter for narrow fuse bases 2009960
Optional accessories

Technical description
13
2.3 Technical data
The SFC250 is defined by the following parameters:
Parameter Value
Triggering threshold 20 A … 250 A (adjustable)
Reclose attempts 0 – 50
Waiting time until reclose 1 – 50 seconds
Operating temperature -20°C to 50°C
Operating humidity 50% at 40 °C
90% at 30°C
Storage temperature -25°C to 70°C
Memory for mains failure Non-volatile event memory
Power supply
Power and supply module
100 … 240 V, 50 Hz / 60 Hz (direct tap at
low-voltage distributor)
Power consumption 20 VA + 1 W/A load current
The power module is defined by the following parameters:
Parameter Value
Load current max. 250 A continuous current
Short-circuit/surge current max. 9000 A
Internal fuses F1: 1 x 800 A and
F2: 1 x 1.25 A
Cut-out capacity 200 kA
Compatibility Fuse holders NH 2 or NH 3
Display elements LED for indicating the switching status
Weight 3 kg
Dimensions (W x D x H) 130 x 155 x 82 mm
Ingress protection rating (in accordance
with IEC 60529 (DIN VDE 0470-1))
IP 20

Technical description
14
The supply module is defined by the following parameters:
Parameter Value
Display Illuminated 3.5-inch colour touch screen
(resistive)
Indicator elements
LED for indicating the switching state (when
the cover is closed)
Memory microSD card, 8 GB
Interfaces and connections •GSM / 2G / 3G / LTE (SIM card
required)
•WLAN (IEEE 802.11x) with WPA2
safety standard
•Ethernet
•Radio interface (868 MHZ)
(communication with remote control)
•USB 2.0
•GPS receiver (integrated)
•Connection for external GPS receiver
(optional)
•Neutral conductor connection
•Activatable trigger output (15 ... 20 V
voltage pulse on fuse tripping or switch
reclose)
•Connection coupling for direct
connection of a power module or for
connection of the three-phase adapter
Weight 900 g
Dimensions (W x D x H) 160 x 103 x 97 mm
Ingress protection rating (in accordance
with IEC 60529 (DIN VDE 0470-1))
IP 42
Protection class (in accordance with
IEC 61140 (DIN VDE 0140-1))
II
The remote control is defined by the following parameters:
Parameter Value
Batteries 2 x Mignon (AA)-Batterie Alkali-Mangan
Operating time >10 hours with fresh batteries
Radio interface 868 MHZ
(communication with remote control)
Weight (incl. batteries and antenna) 200 g
Dimensions (W x D x H) 62 x 31 x 150 mm
Ingress protection rating (in accordance
with IEC 60529 (DIN VDE 0470-1))
IP 40

Technical description
15
2.4 Connections, controls and display
The supply module has the following connection, display and control elements:
Element Description
Touchscreen
Ethernet port
Trigger output (see page 53)
Connection cable for direct connection to a power module or for connection
to the three-phase adapter SFC 250-CA
USB port
SIM card slot
microSD card slot
The microSD card contains the software needed for operation and
may only be removed from the device and the content changed
upon express instruction of an authorised service technician.
Supply module
Inside of cover
Outside of cover

Technical description
16
Element Description
12 V DC input for connecting the supplied power supply
Stylus for operating the touch screen
Connection cable for connecting to the neutral or protective conductor
Socket for connecting the external GPS module (see page 53)

Technical description
17
The power module has the following connection and display elements:
Element Description
Blade contacts
Status indicator
(green)
The power switch is switched off.
CAUTION
Even when switched off, the power switch (thyristor
switch) does not represent a galvanic isolation. For
this reason, it must always be assumed that the
outgoing cable is energised!
With a voltage tester (for example, Duspol), the
mains voltage can be measured on the cable at any
time. Only under load (for example due to the load
resistance integrated in the voltage tester), does the
voltage drop to a much lower value.
(red)
The power switch is on and the protected circuit connected to the
power network.
(white)
Ongoing start or update procedure. If the LED is white over a
longer period, this may indicate firmware incompatibility (see page
75).
(off)The supply module does not supply power (see page 75).
Grip lugs for attaching a fuse plug-in grip
Connection cable for direct connection to the supply module or to the three-
phase adapter SFC 250-CA
Power module

Technical description
18
The remote control features the following connection, display and control elements:
Element Description
BNC coupling for connecting the antenna
LED for display of the wireless connection (is lit when wireless connection is
established)
LEDs for display of the amount of current
Buttons for switching the power switch on and off, or for triggering a pulse in
pulse mode.
The integrated LED signals the status of the power switch the same way as
the LED on the power module (see previous page).
Buttons for switching the remote control on and off.
The integrated status LED can assume the following states:
(green) Remote control switched on
(red)Low battery power
(off)Remote control switched off
Remote control

Technical description
19
The connection adapter is used to connect up to three power modules to a supply module
and has the following connection and display elements:
Element Description
Connection cable to the supply module
Sockets for connecting up to three power modules
Power LED
The LED lights up as soon as the power module connected to the PM-A
socket has been installed in the control cabinet and provides mains voltage.
From this moment on, the connected supply module is also supplied with
voltage and automatically switched on.
Connection adapter
SFC 250-CA

Technical description
20
2.4.1 Information plate
The information plate is attached to the backside of the supply module and provides the
following information necessary for the operation of SFC250:
Element Description
The factory preset login information for access via web browser
The factory preset name of the wireless network (WLAN SSID) and the
password for authentication (WLAN PW)
[optional] License key for activation of the "fault location" option