LEM DCBM 400 Series User Manual

E-Mobility solutions
DCBM 400/600 Series - DC Energy Meter
Operation manual
21January2021/Version 0

LEM DCBM 400 Series Specifications

General

Brand	LEM
Model	DCBM 400 Series
Category	Measuring Instruments
Language	English

Summary

1. Safety Rules and Important Notices

1.1. Safety Warning

Guidance on safe operation and proper use of the product and its functions.

1.2. Important Notices

Key points for product operation, network security, and logbook management.

1.3. Symbols and Conventions

Explanation of symbols used in the document and for reader experience.

2. Document Information and Related Documents

2.1. Document Overview

Details the scope and organization of the manual for the DCBM 400/600 product family.

2.2. Document Issue

Specifies the targeted product and release scope of the document.

2.3. Company Details

Provides contact and address information for LEM International SA.

2.4. Revision History

Records changes made to the document across different versions.

2.5. Related Documents

Lists other documents relevant to the DCBM product family.

2.6. Abbreviations

Defines acronyms and abbreviations used throughout the manual.

2.7. Disclaimer

Limits LEM's liability and outlines user responsibilities for product use.

2.8. Intellectual Property Rights

States copyright and prohibits unauthorized reproduction or modification of the document.

2.9. Third Party Licensing

Details licensing information for software components developed by third parties.

2.10. Warranty

Information on warranty terms and conditions for the DCBM product.

3. Product Introduction and Applications

3.1. LEM and the DCBM

Introduces LEM as a leader in electrical measurement and energy solutions for mobility.

3.2. DCBM in EV Charging Systems

Describes the integration of DCBM meters into EV charging systems.

3.3. DCBM 400/600 in EVSE

Describes the integration of LEM DCBM into different Electric Vehicle Supply Equipment (EVSE).

3.3.1. DCBM in 50 kW EVSE

Presents the typical structure of 50 kW power class charging systems using DCBM.

3.3.2. DCBM in 350 kW EVSE

Details integration of DCBM in 350 kW EVSE for high power charging.

3.4. Certification and Compliance

Lists standards and certifications applicable to the DCBM product.

3.4.1. Standards

Enlists the standards that the DCBM complies with.

3.4.2. Certification

Informs about the availability of the DCBM certification in the Appendix.

3.5. Product Designation

Summarizes product references based on variants like current rating and counting direction.

4. Device Description and Mechanical Integration

4.1. Package Content

Details the items included in the DCBM product package.

4.1.1. Meter Unit Description

Describes the components and features of the Meter Unit.

4.1.2. Sensor Unit Description

Provides a reference to the description of the Sensor Unit.

4.2. Mounting and Unmounting

Instructions for mounting and unmounting the Meter Unit and Sensor Unit.

4.2.1. Meter Unit Mounting/Unmounting

Details the procedures for mounting and unmounting the Meter Unit.

4.2.2. Sensor Unit Mounting

Details the mounting procedure for the Sensor Unit.

4.3. Product Dimensions

Provides detailed dimensional information for the Meter Unit.

4.3.1. Meter Unit

Illustrates and lists the dimensions of the Meter Unit.

4.3.2. Sensor Unit

Provides dimensional data for the DCBM_SU40XX and DCBM_SU60XX Sensor Units.

4.4. Connection

Instructions for connecting wires and cables to the DCBM.

4.5. Cable Management

Guidance on managing wires and data link cables on the Sensor Unit.

4.6. Sealing

Information on manufacturer and installation seals for the device.

4.6.1. Manufacturer Seals

Instructions for checking manufacturer seals before operation.

4.6.2. Installation Seals

Recommendations for using installation seals to prevent unauthorized access.

4.7. Disposing

Instructions for environmentally friendly disposal of the product packaging.

4.8. Marking

Details the marking information found on the Meter Unit and Sensor Unit.

5. Electrical Functions and Performances

5.1. Safety Features

Describes safety features like reinforced insulation and thermal considerations.

5.2. Integration Solutions

Explains how the DCBM can be integrated into different systems.

5.2.1. Overview

Discusses choices for integration based on current flow and voltage side.

5.2.2. Counting Direction

Details the two types of references for direct and reverse counting directions.

5.2.3. Voltage Side

Explains the 'Low side' and 'High side' mounting options for the Sensor Unit.

5.2.4. Direct Counting Direction Connection Requirements

Details the electrical connections for direct counting direction.

5.2.5. Reverse Counting Direction Connection Requirements

Details the electrical connections for reverse counting direction.

5.3. Energy Registering

Explains how import and export energy are registered by the DCBM.

5.4. Handling Energy Losses

Presents solutions to avoid billing energy losses to the customer.

5.4.1. Cable Loss Compensation

Describes the solution to compensate energy dissipated due to cable resistance.

5.4.1.1. Principle

Illustrates the distribution of energy losses in an EVSE electrical circuit.

5.4.1.2. Compensation Mechanism

Explains the calculation and integration of cable loss compensation.

5.4.1.3. Setting the Compensation Level

Details how to set the cable loss compensation level.

5.4.1.4. Setting cableId Value

Explains how the parameter cableId selects preset resistance values.

5.4.2. Four-Wire Measurement

Explains the four-wire measurement mode for high power charging cables.

5.5. Performances

Lists the general performance specifications of the DCBM.

5.5.1. General

Provides a table of general performance parameters for the DCBM.

5.5.2. Accuracy

Details accuracy classes and specifications for DCBM 400 and DCBM 600.

5.5.3. Insulation

Specifies insulation types, voltage ratings, and overvoltage categories.

5.5.4. Operating Conditions

Outlines operating conditions for Sensor Unit, Meter Unit, and data link cable.

5.5.4.1. Sensor Unit

Lists operating and storage conditions for the Sensor Unit.

5.5.4.2. Meter Unit

Lists operating and storage conditions for the Meter Unit.

5.5.4.3. Data Link Cable

Specifies operating conditions for the data link cable.

6. Display and Navigation

6.1. Quick Start

Guides on validating DCBM measurements from the display.

6.1.1. STEP 1 - Power Up the DCBM

Initial steps for powering up the DCBM and checking boot screens.

6.1.2. STEP 2 - Check Transaction Data

Guides on checking transaction data screens for beginning and end of transactions.

6.1.3. STEP 3 - Achieve Further Validation

Steps for accessing data for metrological validation outside transactions.

6.2. General Display Concepts

Explains display concepts, screen sequencing, and button functions.

6.3. Boot Screens

Provides an overview and details of the DCBM boot screens.

6.3.1. Overview

Describes the purpose and sequence of boot screens.

6.3.2. Effect of Buttons

Explains how buttons affect the boot screen sequence.

6.4. Idle Screen

Describes the Idle screen, available data, and button effects.

6.4.1. Overview

Explains the Idle screen as the central screen after boot and transactions.

6.4.2. Available Data

Lists the data displayed on the Idle screen.

6.4.3. Effect of Buttons

Describes how buttons access maintenance screens from the Idle screen.

6.5. Transactions Screens

Details the layout and content of transaction screens.

6.5.1. Layout of Screens

Explains the structure of transaction screens.

6.5.2. State Symbols

Describes the state symbols used for transaction beginning, in progress, and end.

6.5.3. Transaction Energy Register

Explains the transaction energy counter and its associated symbols.

6.5.4. Rolling Data

Features the data displayed in the rolling data pane of transaction screens.

6.5.5. Effect of Buttons

Explains the effect of buttons within different transaction states.

6.6. Maintenance State

Describes the Maintenance state for installation and maintenance data access.

6.6.1. Overview

Explains how to access the Maintenance state and its categories.

6.6.2. Layout of Screens

Details the structure of maintenance screens within categories.

6.6.3. Effect of Buttons

Describes the effect of buttons within the Maintenance state.

6.6.4. Available Data

Provides pictures and data for screens sorted by category.

6.6.4.1. STATUS Category

Details screens related to the status of the data link and energy flow.

6.6.4.2. LIVE MEASURE Category

Details screens showing live measurements of energy, voltage, current, power, and temperature.

6.6.4.3. DEVICE Category

Details screens showing device serial number, IP address, and public key.

6.6.4.4. FIRMWARE Category

Details screens showing firmware versions and checksums for Meter and Sensor Units.

6.6.4.5. CLOCK Category

Details screens related to local date, time, UTC deviation, and time synchronization.

6.7. Error Screen

Describes the error screen displayed when an error is raised.

6.8. Index of Symbols in Screens

Lists symbols used in screens with their meaning and corresponding API labels.

6.8.1. Transaction-Specific

Indexes symbols related to transaction states and data.

6.8.2. Metrology

Indexes symbols related to metrology measurements like energy, voltage, current, power, and temperature.

6.8.3. Time Management

Indexes symbols related to time management, UTC, and local time.

6.8.4. Other Data

Indexes symbols for errors, serial numbers, and firmware information.

7. Software Concepts and Interfaces

7.1. Interfaces

Describes the Ethernet communication channel and REST-compatible API.

7.2. Transactions

Explains the concept of transactions, including start and stop commands.

7.2.1. Concept

Details the process of logging energy usage during charging cycles.

7.2.2. Conditions to Start and Input Parameters

Lists prerequisites and required inputs for initiating a transaction.

7.2.3. Transaction Readouts

Explains how to retrieve transaction data using HTTP/REST interfaces.

7.2.4. Memory Depth

Describes the DCBM's transaction storage limit and backup procedures.

7.2.4.1. Required Action Following a Transaction

Details actions to prevent data loss after a transaction.

7.2.4.2. Fallback Procedure for Unavailable Upload

Outlines procedures for backing up transactions when upload is unavailable.

7.3. Measurements

Details the types of measurements provided by the DCBM.

7.3.1. Energy Registering

Explains energy registering, including metrologically relevant registers.

7.3.2. Bidirectional Current Flow

Describes how import and export energy registers store bidirectional current flow.

7.3.3. Total Energy Registers

Explains availability and storage of total energy registers.

7.3.4. Transaction Energy Registers

Details how transaction energy registers are stored and accessed.

7.3.5. Other Measurements

Lists other measurements like voltage, current, power, and temperature.

7.4. Data Authenticity

Explains how data is signed to ensure authenticity and integrity.

7.4.1. Overview

Describes how data signatures secure transaction and logbook data.

7.4.2. Keys Specifics

Details the two unique public keys used for checking data authenticity.

7.5. Status and Errors Flags

Describes status and error flags for monitoring installation and operation.

7.5.1. Overview

Introduces status and error flags available in various formats.

7.5.2. Status/Errors Value Field Description

Explains the formats for status and errors, including binary and bit-wise representations.

7.5.3. Current Status

Explains how current status is available via API and its persistence over time.

7.5.4. TransactionStatus Field

Describes the transactionStatus field tracking DCBM status during a transaction.

7.5.5. Errors

Lists DCBM errors caught and reported in the API status section.

7.5.6. OCMF Error and Status Fields

Explains OCMF formatted statuses and errors using EF and ST fields.

7.6. Event Logbook

Describes the event logbook for tracing metrological and software events.

7.7. Connectivity Settings

Details network connectivity settings for the DCBM.

7.7.1. IP Addressing

Explains how to configure the DCBM's IP address.

7.7.1.1. Static Addressing

Describes how to assign a static IP address to the DCBM.

7.7.1.2. DHCP

Explains how the DCBM requests an IP address via DHCP.

7.7.1.3. DNS

Describes how the DCBM can be reached using its DNS name.

7.7.2. HTTP & TLS

Details HTTP and TLS communication settings for secure data transport.

7.7.2.1. HTTPS

Explains enabling HTTPS for encrypted and authenticated communication.

7.7.2.2. HTTP Port

Describes configuration of the HTTP port for communication.

7.8. Time Management

Covers time synchronization and local time settings for the DCBM.

7.8.1. Time Synchronization

Explains the importance and methods of time synchronization.

7.8.1.1. Overview

Provides an overview of time synchronization requirements and expiration.

7.8.1.2. General Constraints

Details constraints and recommendations for time synchronization.

7.8.1.3. Synchronization Solutions

Describes available solutions for time synchronization, NTP and command.

7.8.1.4. Command Time Synchronization

Explains how to perform time synchronization via a HTTP request.

7.8.1.5. NTP Synchronization

Details the process and requirements for NTP time synchronization.

7.8.2. Local Time

Explains local time features and its non-relevance for billing.

7.8.2.1. Time Zone

Describes how to configure the DCBM's time zone offset.

7.8.2.2. Daylight Saving Time

Explains configuration of Daylight Saving Time offset.

8. Troubleshooting and Error Resolution

8.1. Wrong Statuses

Troubleshooting guide for incorrect status flags like link, error, transaction, and tampering.

Status Flag #4 - timeSyncStatusIsOk

Troubleshooting for time synchronization status issues.

Status Flag #5 - overTemperaturelsDetected

Troubleshooting for over-temperature detection by the Sensor Unit.

Status Flag #6 - reverseVoltage

Troubleshooting for reversed voltage detected by the Sensor Unit.

Status Flag #7 - suMeasureFailureOccurred

Troubleshooting for errors in the Sensor Unit ADC.

8.2. Raised Errors

Explains how errors correspond to malfunctions and data corruption.

FF# 1 - Error Flag #0 - mulnitIsFailed

Troubleshooting for meter unit initialization failures.

FF# 2 - Error Flag #1 - suStatelsInvalid

Troubleshooting for invalid states of the Sensor Unit.

FF# 4 - Error Flag #2 - versionCheckIsFailed

Troubleshooting for firmware version mismatch between units.

FF# 8 - Error Flag #3 - muRngInitIsFailed

Troubleshooting for random number generation initialization failures.

FF# 16 - Error Flag #4 - muDataIntegritylsFailed

Troubleshooting for CRC errors on meter unit operation data.

FF# 32 - Error Flag #5 - muFwIntegrityIsFailed

Troubleshooting for CRC errors on meter unit firmware memory.

FF# 64 - Error Flag #6 - suIntegrityIsFailed

Troubleshooting for CRC errors on sensor unit data or firmware memory.

FF# 256 - Error Flag #8 - logbookIntegrityIsFailed

Troubleshooting for CRC errors on logbook memory.

FF# 512 - Error Flag #9 - logbookIsFull

Troubleshooting when the logbook is full.

FF# 1024 - Error Flag #10 - memoryAccessIsFailed

Troubleshooting for rejected access to memory.

FF# 8192 - Error Flag #13 - muStatelsFailed

Troubleshooting for unexpected errors in the meter unit.

8.3. Other Software Issues

Troubleshooting common software issues like lost Ethernet connection or time sync problems.

9. Appendix: PTB Type-Examination Certificate

Type-Examination Certificate

Official certificate for the DCBM type-examination from PTB.