LEM DCBM 400 Series - 5.2.5. Reverse Counting Direction Connection Requirements

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21January2021/Version 0

LEM International SA

Chemin des Aulx 8

1228 PLAN-LES-OUATES Switzerland

www.lem.com

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Figure 22: Connection for reverse counting direction references (DCBM_NxD_x010_0000)

Meter Unit

Charging station bus bars



Ethernet Cable

Sensor Unit



Data link cable

Voltage measurement cable +

Current ow

Voltage measurement cable -

DC- DC+

Low side mounting High side mounting

Main Page

Table of Contents2
Safety Rules10
Safety Warning10
Important Notices11
Symbols and Conventions11
Document Information12
Document Overview12
Figure 1. Documentation Information Versus Associated Publics12
Figure 2. Documentation Set for DCBM 400/600 Product Family12
Document Issue13
Company Details13
Revision History13
Related Documents13
Abbreviations14
Disclaimer15
Intellectual Property Rights15
Third Party Licensing15
Warranty16
Product Introduction17
LEM and the DCBM17
DCBM in EV Charging Systems18
Figure 3. Namings Designating Equipment and Protagonists18
Figure 4. Product Construction19
DCBM 400/600 in EVSE21
DCBM in 50 Kw EVSE21
Figure 5. Typical 50 Kw Architecture21
DCBM in 350 Kw EVSE22
Figure 6. DCBM in a Typical 50 Kw EVSE22
Figure 7. Typical 350 Kw EVSE System22
Figure 8. DCBM in a Typical 350 Kw EVSE23
Certification and Compliance24
Standards24
Certification24
Product Designation24
Figure 9. Simplified List of References for 400 a Current Rating24
Figure 10. Simplified List of References for 600 a Current Rating24
Figure 11. Full List of References for the DCBM 400/600 Product Family25
Device Description and Mechanical Integration26
Package Content26
Meter Unit Description27
Sensor Unit Description27
Mounting and Unmounting27
Meter Unit27
Mounting27
Unmounting28
Sensor Unit28
Product Dimensions29
Meter Unit29
Figure 12. Meter Unit Dimensions29
Figure 13. Meter Unit Aperture for Electrical Cabinet29
Sensor Unit30
Figure 14. Sensor Unit Dimensions30
Connection31
Figure 15. DCBM Connection31
Figure 16. Connection and Wiring Diagrams32
Table 1. Ports Definition32
Figure 17. Sensor Unit Integration33
Table 2. Torque Values for Installation33
Table 3. Bus Bar Drilling33
Cable Management34
Sealing34
Manufacturer Seals34
Installation Seals34
Figure 18. Cable Management34
Figure 19. Manufacturer Seals34
Disposing35
Marking36
Electrical Functions37
Safety Features37
Integration Solutions37
Overview37
Counting Direction37
Table 4. Counting Direction References37
Voltage Side38
Figure 20. Import and Export Energy Registers Matched with Energy Flow38
Direct Counting Direction Connection Requirements39
Figure 21. Connection for Direct Counting Direction References (Dcbm_Nxd_X000_0000)39
Reverse Counting Direction Connection Requirements40
Figure 22. Connection for Reverse Counting Direction References (Dcbm_Nxd_X010_0000)40
Energy Registering41
Figure 23. Counting Quadrants for the DCBM41
Handling Energy Losses42
Cable Loss Compensation42
Principle42
Figure 24. Example of Energy Losses in an EVSE Electrical Circuit42
Figure 25. Current Accuracy Graphs with and Without Cable Loss Compensation43
Compensation Mechanism44
Figure 26. Integration Examples Using Cable Loss Compensation44
Setting the Compensation Level45
Setting Cableid Value45
Figure 27. Distribution of RP45
Four-Wire Measurement46
Figure 28. Integration Example for Four-Wire Measurement46
Performances47
General47
Accuracy48
Insulation48
Operating Conditions49
Sensor Unit49
Meter Unit49
Data Link Cable49
Display and Navigation50
Quick Start50
STEP 1 - Power up the DCBM50
Figure 29. Sequence of Screens on Boot and During Idle50
STEP 2 - Check Transaction Data51
Figure 30. Sequence of Screens for Beginning of Transactions51
Figure 31. Sequences of Screens for End of Transactions51
STEP 3 - Achieve Further Validation52
Figure 32. Maintenance Screens Which Can Help Metrological Validation52
General Display Concepts53
Figure 33. Global State Machine of the Display53
Figure 34. Identification of Buttons53
Figure 35. Visual Distinction for Legal Relevance on the Display53
Boot Screens54
Overview54
Effect of Buttons54
Idle Screen55
Overview55
Available Data55
Effect of Buttons55
Transactions Screens55
Layout of Screens55
Figure 36. Transaction Screens Layout55
State Symbols56
Transaction Energy Register56
Figure 37. State Machine for Transaction Screens56
Figure 38. Transaction Energy Register56
Rolling Data57
Effect of Buttons58
Maintenance State59
Overview59
Layout of Screens59
Effect of Buttons59
Figure 39. Maintenance Screens Layout59
Available Data60
STATUS Category60
LIVE MEASURE Category61
DEVICE Category62
FIRMWARE Category63
CLOCK Category64
Error Screen65
Index of Symbols in Screens66
Transaction-Specific66
Metrology67
Time Management68
Other Data68
Software Concepts69
Interfaces69
Table 5. REST API Access and Associated HTTP Methods69
Transactions70
Concept70
Figure 40. Transaction Concept70
Conditions to Start and Input Parameters71
Figure 41. Example of Body for Start Request71
Table 6. Transaction Preconditions in Device Implementation71
Table 7. Required Inputs to a New Transaction71
Transaction Readouts72
Table 8. Solutions for Retrieving Past Transactions72
Memory Depth73
Required Action Following a Transaction73
Fallback Procedure for Unavailable Upload73
Measurements74
Energy Registering74
Bidirectional Current Flow74
Total Energy Registers74
Table 9. Measurement Results, Metrologically Relevant74
Transaction Energy Registers75
Other Measurements75
Figure 42. "Transaction" Vs "Total" Energy Registers (Import or Export)75
Data Authenticity76
Overview76
Keys Specifics76
Figure 43. Keys Specifics for Signature Checks76
Table 10. Solutions for Signatures Verification76
Status and Errors Flags77
Overview77
Status/Errors Value Field Description77
Figure 44. Description of the 2 Formats of Status and Errors77
Current Status78
Figure 45. Illustration of Using Value Field, Example for Status Register78
Figure 46. Status Field Persistence78
Figure 47. Specific Reversedvoltage Status Persistence79
Table 11. List of Status Flags79
Transactionstatus Field80
Figure 48. Transaction Status Field Persistence80
Errors81
Table 12. List of Error Flags81
OCMF Error and Status Fields82
Table 13. OCMF EF Field Equivalents82
Table 14. OCMF ST Field Equivalents82
Event Logbook83
Connectivity Settings84
IP Addressing84
Static Addressing84
Dhcp84
Dns85
Http & Tls85
Https85
HTTP Port85
Time Management86
Time Synchronization86
Overview86
General Constraints86
Synchronization Solutions86
Command Time Synchronization87
NTP Synchronization87
Local Time88
Time Zone88
Daylight Saving Time88
Troubleshooting89
Wrong Statuses89
Raised Errors91
Other Software Issues93
Appendix - PTB Type-Examination Certificate for DCBM94

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LEM DCBM 400 Series - 5.2.5. Reverse Counting Direction Connection Requirements

Table of Contents

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