Technical Information

EM4T II
Energy Meter for On-Board Traction applications

Energy Measurement: EM4T II
Energy Measurement for On-Board Applications:
EM4T II
With the liberalization and/or privatization ofsome of the major rail networks, the opportunity
for traction units to cross national boundaries
now exists, using both the installed base of railand planned rail networks.

Changes in the Energy Markets in the form of
deregulation and increased competition forlarge user contracts brought potential benefits
for those willing to negotiate for their electrical
traction supply requirements.

This gave train designers the daunting task todevelop multi-system locomotives to be usedon the different existing networks.

This negotiation however requires greater
knowledge and understanding of the load
profile of bulk supply points in one of theharshest electrical environments – the traction
supply.

These prime movers would be needed tooperate on the different supply networks ofbordering countries along the route without
requiring an equipment exchange at the regionalor network supply border.
Today, it is therefore technically possible totransfer people or goods throughout Europe,
from Norway to Sicily for example, without any
physical exchange of the locomotive (Picture 1).

2

With the energy meter from LEM, the data forthe precise calculation of both supplied andregenerated energy for billing purposes can beaccomplished on the train, independently of theenergy supplier.

electrified (DC) tracks
FINLANDVR

SWEDENNORWAYNSBRUSSIAN FEDERATION

SJ

3 kV DCESTONIAEVRRZDLATVIALDZ

LITHUANIA

DENMARKIE

BZDUNITED KINGDOMBRNETHERLANDSNSBELGIUM

3 kV DC / 25 kV 50Hz

POLANDGERMANYSNCB

FAP/KHPUZUKRAINECD

SLOVAKIAZSRSNCFFRANCE

AUSTRIAOBBSWITZERLAND

SBB/CFF/FFSHUNGARYMAVSLOVENIAROMANIASNCFRCROATIAFS
MONACOPORTUGALCP

15 kV 16,7 Hz
25 kV 50 Hz

BELARUSIRELAND

1,5 kV DCITALY

BOSNIAAND HERZEGOVINAZBH JZMONTENEGRO KOSOVO

SPAIN

BULGARIA

BDZ

Picture 1:
European rail networks

MACEDONIARENFE

ALBANIAOSEGREECEThe second generation of universal
energy meters for traction especiallydesigned for on-board applications
With the EM4T II energy meter, LEM
introduced the second generation ofuniversal energy meters for electric traction
units with the authorization for billings.
Thanks to the advanced capability (suchas input channels to connect any actual
available current and voltage transducer

Picture 2: EM4T IIor transformer) of the EM4T II, it is usedboth in new multi-system locomotives
and for retrofitting to all types of electricalrail vehicles already in operation.
Recently, the new EN 50463 standards
definecharacteristics
ofenergymeasurement function (EMF) as well astransducers for current and voltage DC
or AC measurement used for EMF. Thisevolution led LEM to upgrade EM4T to
the latest model: EM4T II.

Siemens Train
3

Energy Measurement: EM4T II

not electrified

EM4T II: Main Characteristics

EM4T II - The load profile provider
EM4T II is a single energy meter complying to all therequirements of EN 50463-x & EN 50155 standards
for metering and On-Board use, and thus satisfies
the requirements of EC Decision 2011/291/EC (TSI
“Locomotives and passenger rolling stock”).
EM4T II processes signals from the transformer andelectronic converter systems for current and voltage
to calculate energy values which are stored as load
profile information.
In this load profile (set and stored in intervals of 1, 2,
3, 5, 10 or 15 minutes period length according to theuser), the primary energy (delta) values are recorded
together with data such as:• Date and time stamp• Events• Train identification numbers• Absolute energy values for consumption andregeneration of active and reactive energy• Frequency of the network (16.7 Hz, 50 Hz, 60 Hz orDC)• Additional “user” load profile like the voltage with ashorter time interval (feature coming in a second
design step)• Position of the train at the time the load profile wasstored and/or the event arose• Further functions, such as voltage detection can be
set.
The measured energy information includes separately
the consumed and regenerated active and reactiveenergy and is stored in the load profile memory (at 5minutes period length) for at least 300 days.
The input variables - current and voltage - areconnected to the measuring circuits of the EM4T II
via differential inputs (Picture 2 and 3), designed forconnection of all current and voltage transducers/transformers currently available on the market.
Four input channels are proposed for metering of both
DC and AC signals of any existing traction network(see chart 1).
The EM4T II is suitable for usage in multi-systemvehicles. Supply systems 25 kV 50/60 Hz and 15 kV
16.7 Hz, or either 600 V DC, 750 V DC, 1.5 kV DC or 3
kV DC are covered. A system change is detected by
the energy meter and stored in the load profile.
The requirements for current measurement at thislevel can be diverse.
A large aperture transducer is appropriate when the
primary conductor is highly isolated to support thehigh level of voltage (15 to 25 kV AC as nominal level):
LEM’s ITC Transducer Series is of this category.

4

For the DC networks, the transducer’s inherent
isolation properties are adequate.
Analog to Digital Sigma-Delta conversion processors
suppress high frequency disturbances in all channels,
enhancing even further the capacity to handle theoften rapid supply transitions within traction supplies.
The microprocessor reads the sampled values andcalculates the real energy in adjustable intervals(standard value = 5 min). The results are then saved in
flash memory (a special variant of an EEPROM).
The signals from 2 AC and 2 DC input channels (eachfor U- and I- input) are used to calculate the energy
values. The high-accuracy measurement of the energy
value is guaranteed by the digitally sampled signal
converter implemented, providing the highest level oftemperature and long-term stability.
Optionally, the EM4T II for DC measurement isavailable in a version with a single voltage input and
up to three current inputs to measure the energy
consumption for vehicles with multiple power supply
points.
The EM4T II has a dedicated RS232 interface input
for receiving serial GPS-data messages according to
NMEA 0183, including the location data of the energy
consumption point. It synchronizes also the internal
clock of the meter using the obtained time information.
A log book in full conformity with EN 50463-3 is stored
in the EM4T II. This log book information contains
e.g. loss and gain of the operating voltage, power
up/power down events of the supply voltage, clock
synchronization, and the modification of parameters
influencing the energy calculating.
Identification data of the vehicle or train are also
stored and can be retrieved separately. The selfluminous display of the EM4T II shows cyclicallyall relevant energy and status information without
required operations of a mechanical or optical button.
All measured and stored data can be read out via the
RS-type interface (via modem or local).
The interface versions RS232, RS422 or RS485
are available. The applied data communications
protocol is IEC 62056-21 and is therefore easily
adaptable by all common remote reading systems.
In the next version, the EM4T II will also provide an
Ethernet-interface.
The supply voltage is selectable between 24 V and
110 V. Optionally, the EM4T II offers a power supply of
12 V for a communication unit (modem).
The operating conditions (considering EMC,
temperature, vibration, etc.) meet the special
requirements for traction use, including EN 50155, EN
50121-3-2, EN 50124-1, and EN 61373. The compact
and fire-retardant enclosure provides protection
against the ingress of moisture or foreign objects
according IP 65.

EM4T II: Main Characteristics

EM4T II
Energy meter for On-Board Traction• Data recording according to EN 50463-x• Accuracy 0.5R according to EN 50463-2• Multi-System capability for DC, 16.7 Hz, 50 Hz, 60 Hz• Supply systems according to EN 50163: 25 kV 50 Hz, 15 kV 16.7 Hz, 600 V
DC, 750 V DC, 1.5 kV DC, 3 kV DC• Measurement of consumed and regenerated active and reactive energy• For DC optionally with up to 3 DC current channels• Input for GPS receiver• Load profile recording including location data
• RS-type interface for data communication• Ethernet-interface (Available in the next version)
Version
AC
ACDC
DC
DCDC
DCDCDC

Channel 1
AC-voltage
AC-voltage
DC-voltage
DC-voltage
DC-voltage

Channel 2
AC-current
AC-current
DC-current
DC-current
DC-current

Channel 3

Channel 4

DC-voltage

DC-current

DC-current
DC-current

DC-current

Chart 1: EM4T II possible configurations for inputs

Modem(GSM / GPRS / GSM-R)

GPS
Receiver

Local
Interface

Display

Battery Supply
ISOLATION
OverVoltage
Protection
Supply Buffer

ISOLATIONMEMORYµ-Processor

RESET
ISOLATION

Internal Supply

CLOCK(Buffer Battery)

ISOLATION

ADC

ADC

ADC

ADC

SensorSensorSensorSensorChannel#1

Channel#2

Channel#3

Channel#4

Transducer

Transducer

Transducer

Transducer

Picture 3: Block diagram of the LEM energy meter5

Standards & Regulations

Standards & Regulations
The EM4T II has been designed to comply with the following standards and regulations(excerpt)
EN 50463-x (2012)

Railway application –Energy measurement on board trains

EN 50155 (2007)

Railway applications –Electronic equipment used on rolling stock

EN 50121-3-2 (2006)

Railway applications - Electromagnetic compatibility Part 3-2: Rolling stock – Apparatus

EN 61373 (2010)

Railway applications - Rolling stock equipment Shock and vibration tests

EN 50124-1 (2001)

Railway applications – Insulation coordination –Part 1: Basic requirements

IEC 62056-21 (2002)

Electricity metering - Data exchange for meter reading,tariff and load control - Part 21: Direct local dataexchange

ITC 2000...4000-S FAMILY
Better than Class 0.5R current measurement
High temperature stability

6Energy Measurement Solutions
Part of high voltage frame of a multi-system locomotive with the positions needed
for current & voltage measurement

DV-VOLTAGE FAMILY
1200 to 4200 VRMS
One unique compact package
Class 0.5R accuracy - Low thermal drift

7

Data SheetTechnical Data EM4T II
Measuring input channels•

4 galvanic isolated inputs for connection of U- andI-sensors (either for AC, DC or ACDC),
or•for connection of one U-sensor (DC) and up to three
I-sensors (DCDCDC)

Measuring ranges
Rated voltage (secondary)

AC: 70 – 300 V or 17.9 – 100 mA
DC: 17.9 – 100 mA

Rated current (secondary)

AC: 1 – 5 A or 25 – 1000 mA
DC: 25 – 2000 mA

Accuracy

Class 0.5R (acc. to EN 50463-2)

Sampling interval

4800 Hz

Load profile•

Recording of consumed and regenerated active andreactive energy•

units kWh or kvarh•

recording period length min. 1 minute•recording of location and status information acc. to
EN 50463-3•

memory depth at least 60 days (for 1 minute period
length)Clock accuracy< 20 ppm

Interfaces•

1 x RS-interface (bidirectional, RS232, RS422
or RS485) with 2 connections in parallel (screw
terminals and pin header), e.g. for modem
connection; data protocol according to EN 50463-3
and IEC 62056-21•

1 x RS232 (unidirectional) for registration of GPSdata telegrams according to NMEA 0183

Display

LCD, self-luminous, letter height approx. 4 mm

Degree of protection

IP 65

Supply voltage

24 – 110 V (acc. to EN 50155),
power consumption (without modem) 3 W

Supply voltage(optional)
Temperature ranges

for

modem

12 V, continuous load 3 W, peak value 6 W
Daily modem reset by EM4T II
Operating temperature: -40 °C – +75 °C
Storage temperature: -40 °C – +85 °C

8Dimensions

approx. 165 x 289 x 70 mm (W x H x D)

Weightapprox. 1.5 kg

Data Sheet

Dimensions EM4T II

Terminal block and connections

9

Data Sheet

Connection EM4T II
Connectors
13 – GPS (in) - RS232-TxD

16 – RS232-n.c.

RS485-n.c.

RS422-A

14 – GPS (in) - RS232-RxD

17 – RS232-n.c.

RS485-n.c.

RS422-B

15 – GPS (in) - RS232-GND

18 – RS232-TxD

RS485-B

RS422-B’

19 – RS232-RxD

RS485-A

RS422-A’

20 – RS232-GND

RS485-GND

RS422-GND

1 – U_Modem + (out)5 – CH1/U-AC high

9 – CH3/U-DC high2 – U_Modem - (out)6 – CH1/U-AC low

10 – CH3/U-DC low

3 – U_Batt + (in)7 – CH2/I-AC high

11 – CH4/I-DC high

4 – U_Batt - (in)

8– CH2/I-AC low

12 – CH4/I-DC low

Display layout

Display of used mains system (possible values):
12

16.7 Hz – Current measurement on Channel 2 (only possible for AC- or ACDC-devices)52

50 Hz – Current measurement on Channel 2 (only possible for AC- or ACDC-devices)62

60 Hz – Current measurement on Channel 2 (only possible for AC- or ACDC-devices)

D4
D2

DC – Current measurement on Channel 2 (only possible for DCDC- or DCDCDC-devices)

D 3

DC – Current measurement on Channel 3 (only possible for DCDC- or DCDCDC-devices)D
10

DC – Current measurement on Channel 4 (only possible for DC- or ACDC-devices)4

DC – Current measurement on Channel 4 (only possible for DCDCDC-devices)We design and manufacture high quality and highly reliable products for our customers
all over the world.
We have delivered several million current and voltage transducers since 1972 and most ofthem are still being used today for traction vehicles, industrial motor drives, UPS systems
and many other applications requiring high quality standards.
The warranty granted on LEM transducers is for a period of 5 years (60 months) from thedate of their delivery (not applicable to Energy-meter product family for traction
and automotive transducers where the warranty period is 2 years).
During this period LEM shall replace or repair all defective parts at its’ cost (provided thedefect is due to defective material or workmanship).
Additional claims as well as claims for the compensation of damages, which do not occur
on the delivered material itself, are not covered by this warranty.
All defects must be notified to LEM immediately and faulty material must be returned to thefactory along with a description of the defect.
Warranty repairs and or replacements are carried out at LEM’s discretion.
The customer bears the transport costs. An extension of the warranty period following
repairs undertaken under warranty cannot be granted.
The warranty becomes invalid if the buyer has modified or repaired, or has had repaired bya third party the material without LEM’s written consent.
The warranty does not cover any damage caused by incorrect conditions of useand casesof force majeure.
No responsibility will apply except legal requirements regarding product liability.
The warranty explicitly excludes all claims exceeding the above conditions.
Geneva, 21 June 2011

François Gabella
President & CEO LEM
June 2011/Version 1

11

LEM’s Warranty

5 Year Warranty on LEM Transducers

Europe • Middle East

Czech Republic, Slovakia
PE & ED, spol. s r.o.
Koblovska 101/23
CZ-71100 Ostrava
Tel. +420 596 239 256
Fax +420 596 239 531
e-mail: peedova@peed.cz

Belarus and Baltic Republics
DACPOL Sp. z. o. o.
ul. Pulawska 34
PL-05-500 Piaseczno
Tel. +48 22 7035100
Fax +48 22 7035101
e-mail: dacpol@dacpol.com.pl

FinlandETRA Electronics Oy
Lampputie 2
FI-00740 Helsinki
Tel. +358 207 65 160
Fax +358 207 65 23 11
e-mail: markku.soittila@etra.ﬁ

BeNeLux
LEM Belgium sprl-bvba
Egelantierlaan, 2
B-1851 Humbeek
Tel. : +32 22 70 30 84
Fax : +32 22 70 30 85
e-mail : lbe@lem.com

Field Applications Engineer
Mr. Pasi Leveälahti
Kausantie 668, 17150 Urajärvi
Tel. +358 50 5754435
Fax +358 37667 141
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Bosnia, Croatia, Herzegovina,
Serbia and Slovenia
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Via di Noghere 94/1
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Fax +39 040 23 24 40
e-mail: dino.fabiani@
proteuselectric.it
Bulgaria, Hungary
ineltron GmbH
Hugenottenstr. 30
D-61381 Friedrichsdorf
Tel.: +36 70 3666055
Tel.: +49 (0)6172 598809
Fax.:+49 (0)6172 75933
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Asia • Pacific

Africa • America

LEM International Sales Representatives

Austria and CEE
LEM Deutschland GmbH,
Office Austria
Concorde Business Park 2/F/6
A-2320 Schwechat
Tel. +43 1 706 56 14-10
Fax +43 1 706 56 14-30
e-mail: tbu@lem.com

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F. 92340 Bourg-La-Reine
Tel. +33 1 45 36 46 20
Fax +33 1 45 36 06 16
e-mail: lfr@lem.com
Germany
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Frankfurter Strasse 74
D-64521 Gross-Gerau
Tel. +49 6152 9301 0
Fax +49 6152 8 46 61
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IsraelOfer Levin TechnologicalApplication
PO Box 18247
IL- Tel Aviv 611 81
Tel.+972 3 5586279
Fax +972 3 5586282
e-mail: ol_teap@netvision.net.il
ofer.levin@tec-apps.co.il
Italy
LEM Regional Office Italy
via V. Bellini, 7I-35030 Selvazzano Dentro, PD
Tel. +39 049 805 60 60
Fax +39 049 805 60 59
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PolandDACPOL Sp. z o.o.
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Tel. +48 22 7035100
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Portugal
QEnergia, Lda
Centro Empresarial S. Sebastião
Rua de S. Sebastião Lt 11 n.º 10,
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PortugalTel. +351 214 309 320
Fax. +351 214 309 299
e-mail: qenergia@qenergia.pt

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Rua Dr. Ulhôa Cintra, 489,
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Moji Mirim - São Paulo - Brazil
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Fax +55 19 3806 8422
e-mail: jeduardo@amds4.com.br

South Africa
Denver Technical Products Ltd.
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USA, Canada, Mexico
LEM USA, Inc., Central Office11665 West Bradley Road
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USA
Toll free: 800 236 5366
Tel. +1 414 353 0711
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Australia and New Zealand
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Shanghai Office, R510,
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Level 2, Connaught Place,
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Hefei Office, R804,
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Xi‘an OfficeR703, Tower B
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Distributor

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Fax +90 216 466 3686
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Ukraine“SP DACPOL” Co Ltd.
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Nagoya Sales Office
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Young Woo Ind., Co.
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Fax +82 31 266 8857
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Korea
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D-Cube City, Office Tower 15F,
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TaiwanPOWERTRONICS CO. LTD
The Tapei SUN-TECH
Technology Park
10th Floor, No. 205-2, Section 3,
Beixin Road, Xindian City,
Taipei County
23143, Taiwan, R. O. C.
Tel. +886 2 7741 7000
Fax +886 2 7741 7001
e-mail: sales@powertronics.com.tw

S&H Trading
Rm.302 Eopmu A-dong,
Chungang Yutong, 1258,
Gurobon-dong, Guro-gu,
Seoul, 152-721, Korea
Tel. +82 2 2686 83 46+82 2 2613 83 45
Fax. +82 2 2686 83 47
e-mail: snh@hinodekorea.co.kr

Tope Co., Ltd.
3F-4, 716 Chung Cheng road
Chung Ho City, Taipei Hsien,
Taiwan 235, R.O.C.
Tel. +886 2 8228 0658
Fax +886 2 8228 0659
e-mail: tope@ms1.hinet.net