LEM DCBM 400 Series User manual
E-Mobility solutions
DCBM 400/600 Series - DC Energy Meter
Operation manual
21January2021/Version 0
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cableId 45
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Statuserrors 77
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transactionStatus80
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DNS 85
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Figure 1. Documentation information versus associated publics ...................................... 12
Figure 2. Documentation set for DCBM 400/600 product family ....................................... 12
Figure 3. Namings designating equipment and protagonists ............................................ 18
Figure 4. Product construction........................................................................................... 19
Figure 5. Typical 50 kW architecture ................................................................................. 21
Figure 6. DCBM in a typical 50 kW EVSE ......................................................................... 22
Figure 7. Typical 350 kW EVSE system ............................................................................ 22
Figure 8. DCBM in a typical 350 kW EVSE ....................................................................... 23
Figure 9. Simplied list of references for 400 A current rating ........................................... 24
Figure 10. Simplied list of references for 600 A current rating ........................................ 24
Figure 11. Full list of references for the DCBM 400/600 product family .............................. 25
Figure 12. Meter Unit dimensions........................................................................................ 29
Figure 13. Meter Unit aperture for electrical cabinet ........................................................... 29
Figure 14. Sensor Unit dimensions ..................................................................................... 30
Figure 15. DCBM connection .............................................................................................. 31
Figure 16. Connection and wiring diagrams ........................................................................ 32
Figure 17. Sensor Unit integration....................................................................................... 33
Figure 18. Cable management ............................................................................................ 34
Figure 19. Manufacturer seals............................................................................................. 34
Figure 20. Import and export energy registers matched with energy ow........................... 38
Figure 21. Connection for direct counting direction references (DCBM_NxD_x000_0000) 39
Figure 22. Connection for reverse counting direction references (DCBM_NxD_x010_0000).40
Figure 23. Counting quadrants for the DCBM ..................................................................... 41
Figure 24. Example of energy losses in an EVSE electrical circuit ..................................... 42
Figure 25. Current accuracy graphs with and without cable loss compensation................. 43
Figure 26. Integration examples using cable loss compensation ........................................ 44
Figure 27. Distribution of RPvalues depending on product designation............................... 45
Figure 28. Integration example for four-wire measurement................................................. 46
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Figure 29. Sequence of screens on boot and during idle .................................................... 50
Figure 30. Sequence of screens for beginning of transactions ........................................... 51
Figure 31. Sequences of screens for end of transactions ................................................... 51
Figure 32. Maintenance screens which can help metrological validation............................ 52
Figure 33. Global state machine of the display ................................................................... 53
Figure 34. Identication of buttons ...................................................................................... 53
Figure 35. Visual distinction for legal relevance on the display ........................................... 53
Figure 36. Transaction screens layout................................................................................. 55
Figure 37. State machine for transaction screens ............................................................... 56
Figure 38. Transaction energy register................................................................................ 56
Figure 39. Maintenance screens layout............................................................................... 59
Figure 40. Transaction concept ........................................................................................... 70
Figure 41. Example of body for start request ...................................................................... 71
Figure 42. "Transaction" vs "Total" energy registers (Import or Export) .............................. 75
Figure 43. Keys specics for signature checks ................................................................... 76
Figure 44. Description of the 2 formats of status and errors ............................................... 77
Figure 45. Illustration of using value eld, example for status register .......................... 78
Figure 46. Status eld persistence ...................................................................................... 78
Figure 47. Specic reversedVoltage status persistence ............................................... 79
Figure 48. Transaction status eld persistence ................................................................... 80
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Table 1. Ports denition.................................................................................................... 32
Table 2. Torque values for installation.............................................................................. 33
Table 3. Bus bar drilling.................................................................................................... 33
Table 4. Counting direction references ............................................................................ 37
Table 5. REST API access and associated HTTP methods............................................. 69
Table 6. Transaction preconditions in device implementation.......................................... 71
Table 7. Required inputs to a new transaction ................................................................. 71
Table 8. Solutions for retrieving past transactions ........................................................... 72
Table 9. Measurement results, metrologically relevant .................................................... 74
Table 10. Solutions for signatures verication.................................................................... 76
Table 11. List of status ags ........................................................................................... 79
Table 12. List of error ags................................................................................................. 81
Table 13. OCMF EF eld equivalents................................................................................. 82
Table 14. OCMF ST eld equivalents................................................................................. 82
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In order to guarantee safe operation of the product and to be able to make proper use of all
features and functions, please read these instructions thoroughly!
Safe operation can only be guaranteed if the product is used for the purpose it has been designed
for and within the limits of the technical specications. Ensure you get up-to-date technical
information that can be found in the latest associated datasheet under www.lem.com.
Terminal protection cover delivered with the product must be installed to obtain proper electrical
protection. The data link cable used between the product’s elements shall be the one delivered
by LEM.
Electrical equipment should be installed, operated, serviced and maintained only by qualied
personnel.
No responsibility is assumed by LEM International SA for any consequences arising out of the use
of this material. A qualied person is one who has skills and knowledge related to the construction,
installation, and operation of electrical equipment and has received safety training to recognize
and avoid the hazards involved.
The meter must be installed inside an enclosure IP51 (indoor) or IP54 (outdoor) according to
EN 50470:2007.
When installing or changing the product, the conductor to which the product is connected must be
de-energized. Ignoring the warnings can lead to serious injury and/or cause damage!
The appropriate torque is dened by LEM (see "Table 2: Torque values for installation" and "4.2.
Mounting and unmounting")
The appropriate crimping of the connection elements is dened by the nationalities in force.
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• Time source to set product’s time must be provided by the customer. Product must be time
synchronized to operate.
• Product’s Ethernet interface mustn’t be exposed to a public network; network must be private and
secured.
• To ensure proper operation, product’s logbook completion must be checked periodically; the maximum
number of entries is approximately 40 000; product’s operation stops if logbook is full.
• The product is designed with IP20, and is intended to be mounted in an enclosure with a suitable IP
rating for the nal application.
• The direct current meters may only be used for billing purposes in business and ocial trac in a
charging device and only for measuring the energy supplied to the vehicle.
• The connection line for voltage measurement must be provided with the supplied ferrite so that the
measurement reliability is guaranteed in the event of interference.
• For the device types DCBM_N0D_4000_0000, DCBM_N0D_4010_0000, DCBM_N0D_6000_0000
and DCBM_N0D_6010_0000, for which the compensation factor can be selected via the Ethernet
interface, the interface must be sealed or a calibrated remote station must be directly connected and
secured by means of seals. At the end of the transaction, this remote station must compare the cable ID
specied in the data tuple signed by the DC meter with the cable ID originally transferred to the DC meter.
If this comparison is valid then the data tuple can be used. The remote station can also directly overwrite
the cable ID specied in the data tuple.
The following symbols point out critical information. They can be found either in this document or
on the product.
Instruction manual Heating Warning
Electrical hazard Double insulation
The following symbols aim at improving reader's experience by highlighting sections.
!Note
iTip
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This document relates to the DCBM 400/600 product family. Those products are direct connected
energy meters for DC applications. This manual describes all necessary information for proper
use. It is organized by topics:
• Mechanical: product mounting and integration into an electrical system.
• Electrical: electrical functions and performances
• Software: integration of product family into information technology systems, and main software
features
Audience of this document is wide. The following visual matches sections with associated publics.
Marketing
Purchasing
Integration
Mechanics
Electrical
Software
Safety rules, Document
info., Product intro.
Electrical functions
Device description and
mechanical integration
Display information
Software concepts
Troubleshooting
Figure 1: Documentation information versus associated publics
This document is part of a document set. Below illustration describes the set of documents for
DCBM 400/600 product family with associated steps in product lifetime.
Installation manual
Datasheet
Operation manual
Communication Protocols manual
Pre-study
Installation
Commissionning
Operation& Maintenance
End-of-life
Figure 2: Documentation set for DCBM 400/600 product family
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Targeted Product DCBM 400/DCBM 600
Release scope Public
LEM International SA
Chemin des Aulx 8
1228 Plan-les-Ouates
Switzerland
Date
021January2021 First issue
Name
Datasheet Publication pending
Communication Protocols manual Publication pending
Installation manual Version 1
EN 50470-1 2006
EN 50470-3 2006
CISPR22 Class-B emission
IEC 62477-1
EN 62052-31 2015
IEC 62052-11 2003
IEC 61000-6-2 2016
IEC 61000-6-3 2016
RoHS
OCPP 1.6 1.6, 2.6
WELMEC 7.2 Software Guide 2015
REA-6A
PTB 50.7
VDE-AR-E 2418-3-100 2019-07-16
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ADC Analog to Digital Converter UTC Coordinated Universal Time
API Application Programming Interface V2G Vehicle To Grid
CCS Combined Charging System VP & VN Voltage positive/negative input
CRC Cyclic Redundancy Checksum
DC / AC Direct current / Alternating current
DCBM DC Billing Meter
DHCP Dynamic Host Conguration Protocol
DNS Domain Name System
DST Daylight Saving Time
EMI Electromagnetic interference
EV Electric Vehicle
EVSE Electric Vehicle Supply Equipment
FW Firmware
HTTP[S] Hypertext Transfer Protocol [Secured]
IANA Internet Assigned Numbers Authority
ID Identier
Info Information
Init Initialization
Intro Introduction
IP Internet Protocol / Ingress Protection Code
IR Infrared
JSON JavaScript Object Notation
LED Light-emitting diode
LR / LNR Legally relevant / Legally non-relevant
MSB & LSB Most Signicant Bit / Least Signicant Bit
MU Meter Unit
N/A Not applicable
NTP Network Time Protocol
OBIS Object Identication System
OCMF Open Charge Metering Format
OCPP Open Charge Point Protocol
OVC Overvoltage Category
PTB German Physikalisch-Technische
Bundesanstalt
REST Representational state transfer
RMS Root Mean Square
RNG Random Number Generator
RTOS Real-Time Operating System
S.A.F.E. Software Alliance For E-mobility
SELV Separated Extra-Low Voltage
SU Sensor Unit
TLS Transport Layer Security
URL / URI Uniform Resource Locator / Identier
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LEM cannot be held liable for damage, injury or any legal responsibility incurred directly or indirectly
from non product quality issues such as other use of the DCBM than according to LEM written
installation instructions (see section "4. Device description and mechanical integration") or other
external factors.
The user shall observe safe and lawful practices, including, but no limited to, those set forth in this
document. Before any operation or use, please read “Safety” section carefully.
LEM reserves the right to carry out modications on its product and documentation at the sole
discretion of LEM. Always make sure to have the latest information before placing an order. For up-
to-date product information, visit www.lem.com or contact your nearest LEM sales representative.
© Copyright 2020 LEM INTERNATIONAL SA. All rights reserved.
This document shall not be reproduced, copied, adapted, translated, arranged or modied without
written permission from LEM, and the content, in whole or in any part, shall not be used for any
purpose other than describing LEM DCBM. LEM will retain all intellectual property rights in and
to this document. No license is granted by LEM to any intellectual property right. All rights not
expressly granted are reserved by LEM.
Disassembly, decompilation, reverse-engineering, decryption, or alteration of the DCBM, including
its software, are prohibited.
“LEM” and any related logos are protected trademarks owned by LEM HOLDING SA or trade
names and cannot be used for other purposes than LEM usage without specic prior written
permission.
Unless otherwise expressly granted by LEM in writing, the sale of the DCBM will not confer any
license under any patents, trademarks, trade names, or other proprietary rights owned or controlled
by LEM, its aliates or suppliers, all rights being reserved.
The DCBM includes software developped by SEGGER Microcontroller GmbH (SystemView RTT),
STMicroelectronics (STM32Cube) and ARM LIMITED (CMSIS), available under BSD license, with
following conditions.
Copyright © 2014 - 2020 SEGGER Microcontroller GmbH
Copyright © 2016 STMicroelectronics
Copyright © 2020 ARM LIMITED
Redistribution and use in source and binary forms, with or without modication, are permitted
provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions
and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of
conditions and the following disclaimer in the documentation and/or other materials provided
with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors may be used
to endorse or promote products derived from this software without specic prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The DCBM includes software developped by Amazon Inc (FreeRTOS), available under MIT
license, with following conditions.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation les (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to
do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
For information about applicable warranty for the DCBM, contact your nearest LEM sales
representative.
In the absence of any written agreement with LEM governing the sale of the DCBM to you, LEM
general terms and conditions of sale as referred on the order conrmation shall apply. LEM
disclaims all warranties of any kind, except as expressly provided in the above agreement or terms
and conditions of sale, whether express or implied, relating to the DCBM and its documentation,
including any implied warranty of merchantability, tness for a particular purpose or non-
infringement.
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The automotive world is seeing a rapid transition to electric vehicles, driven by concern for the
environment and accelerated by legislation. For the transition to EVs to be successful, a network
of charging points is required.
Today there are increasing restrictions on how the billing must be managed: for example, the
German Eichrecht regulations state that consumers should only be charged for the DC power
supplied and not for any power loss associated with the conversion from AC to DC. Developing a
DC metering solution is a complex challenge that could delay the successful transition to electric
automobiles.
By using DCBM 400/600 product family, developers and installers of electric charging points
can easily prove their compliance with legislation while reducing the time required to design the
charging system.
Leading the world in electrical measurement, LEM
engineers the best solutions for energy and mobility,
ensuring that its customers’ systems are optimized,
reliable and safe.
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LEM Direct Current Billing Meters with 400 A and 600 A ratings, are connected DC energy meters,
referred to as "DCBM" in this document. They are dedicated to energy metering in the eld of
DC applications such as fast and ultra-fast charging station for Electric Vehicles (covered by IEC
61851-23). Typical applications of the DCBM 400/600 product family are 50 kW up to 350 kW
Electric Vehicle charging systems.
The following gure illustrates typical integration of the device, and lists equipment and protagonists
as they are referred to in hereby document.
Figure 3: Namings designating equipment and protagonists
The DCBM comes with the following highlights:
Advantages
• Split meter concept easy to integrate into systems
• Flexible integration with bus bars or wires
• OCMF readouts compliant with S.A.F.E
• Compliant for energy billing or parking time billing
• System monitoring: Current, Voltage, Power, Temperature
Applications
• Electric Vehicle Charging infrastructures
• Data centers
• DC grids & Energy Monitoring
• Energy storage, Renewables
DC link 1
DC link 2
DC link 3
AC
DC DC
DC
AC grid
To the
backend
Power converters Charge post 1
DCBM
DCBM
DCBM
EV
End user
Communication interface
Charger
controller
EVSE/Charging station, operated by the Charge point operator
Charge post 2 Charge post 3
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Features
• Range of operation 150…1000 V DC
• Two sizes: Imax 400 A and 600 A,
• Wide current terminals, compliant with bus bars
• Bi-directional energy metering (V2G)
• Accuracy Class B, -40°C to 85°C
• Compatible with 4 wire measurement
• Cable loss compensation
• Ethernet communication with HTTP/HTTPS
• Signed data readouts in OCMF or LEM format
• Monitoring data (current / voltage / temperature / energy)
• Transaction mechanisms with start & stop tags and client identication
• Auxiliary power supply range +12 ... +48 V DC
• DIN rail 35mm and screw mounting
• Length of Datalink cable from 30 cm up to 3.5 m
• Integrated display with backlight
• Reinforced insulation at 1000 V DC, OVC II
• Sealing of terminals and interfaces
The DCBM is split into two elements linked via a cable (delivered with the DCBM): the Sensor Unit
and the Meter Unit. Figure hereunder depicts product construction.
Sensor Unit
The device is
connected to busbars
or wired systems, and
senses accurately
current and voltage to
measure energy
continuously. Data is
securely transferred
to the Meter Unit.
Meter Unit
The device stores,
displays, communicates
and authenticates
measurement data. The
Meter Unit delivers
power supply to the
Sensor Unit.
The Meter Unit offers
communication with the
charging station through
Ethernet /REST APIs.
Data link cable
Delivered with the product, this cable
connects Meter Unit to Sensor Unit, both
terminals can be sealed.
Figure 4: Product construction
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Sensor Unit has four terminals: two terminals to measure current ow and two terminals to measure
the DC link voltage. An arrow printed on the Sensor Unit indicates the default current ow used to
measure imported energy.
The DC meter DCBM is designed in a hardware-based split and consists of the Sensor Unit, the
Meter Unit and a datalink cable between the two units.
Two current rating Sensor Units are available. The possible installation variants of the sensor
types are listed in this manual The Sensor Unit and the Meter Unit are paired together. If another
Sensor Unit is connected to the Meter Unit a specic error ag is raised.
DCBM 400/600 operate from an auxiliary power supply (12... 48 V DC).
To cover the dierent power ratings of charging systems, the DCBM is available for 2 current
ratings:
Imax = 400 A or Imax = 600 A. Two additional variants of Sensor Unit oer measurement with current
measurement in the opposite direction.
This manual suits for next models
1
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