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Wallbox charging group and external consumer readings captured by energy meters
The load management ensures that the total of the charging currents in a charging group does not exceed the capacity of the network connection line. Up-to-date information on power consumption by external loads is captured by means of an additional external energy meter. The coordinator wallbox is, for example, connected via Modbus TCP with the meter and regularly requests the current level of consumption by the external consumers. Accordingly, the meter must be capable of communicating with an Ethernet interface and TCP/IP protocol.
About the list of compatible energy meters.
The coordinator subtracts the values transmitted by the meter from the network connection current limit set ("Current limit for load management") and makes the resulting remaining current evenly available to the charging group.
Parameter configuration
Setting up of load management requires all charging stations to be in the same network. For configuration open the app and go to System - Settings.
Open "Advanced settings" and display "Expert settings".
Now select "Dynamic load management (DLM)".
Define precisely one charging station per charging group as DLM coordinator, to handle coordination with the DLM charging points.
The following parameters must be set in the DLM coordinator and in all DLM charging points:
1. "Coordinator/charging point DLM role" parameter:
- It is recommended that in the DLM coordinator the setting "DLM coordinator" is selected and in the DLM charging points "DLM charging point (Auto-Discovery)". In this configuration the coordinator automatically finds all charging points in the same network.
- The information "Number of identified DLM charging points" provides corresponding information on how many charging points are linked with a coordinator.
- This database can be deleted via the "Reset DLM charging point database" parameter, if one or more wallboxes have left the charging group. To delete, the parameter must be set and transmitted; this is then automatically reset and the database in the wallbox deleted.
2. "DLM network ID" parameter:
- Assign a network ID, e.g. 1, for the charging group. The ID must be identical in the coordinator and in all other charging points.
3. "Mains connection lower current limit" parameter:
- Enter here the minimum current limit that the charging process should not fall below. If less charging current is available than the limiting value, the charging process is paused. (Standard setting: 6A)
4. "Current limit in the event of a connection failure" parameter:
- Permanently saved current limit for each charging point, if the wallbox is unable to establish a link to the DLM coordinator.
- The following parameters only need to be set in the DLM coordinator wallbox: The above steps complete the configuration of the DLM charging points. The following parameters are preset as standard in each DLM charging point, although they have no effect on load management and can be ignored. Only the values of the DLM coordinator are used.
5. "Sub-distribution current limit load management" parameter:
- Set the network connection current limit for all three phases L1/L2/L3 here. This value is dependent upon the rated current of the fuse in the sub-distribution of the charging group.
6. "Maximum distributable charging current" parameter:
- Set the available current here, for all three phases L1/L2/L3, for distribution to the connected electric vehicles. This current limit must be equal to or less than the load management current limit.
It is also advisable to define the unbalanced load prevention in a charging group. To do so, set the following parameters:
7. "Unbalanced load prevention" parameter:
- This parameter must be "activated". Once this parameter has been activated, the DLM will not exceed the configured unbalanced load limit.
8. "Unbalanced load limit" parameter:
- Enter here the maximum permitted unbalanced load in the charging group taking into consideration the local installation.
Then the external meter is configured.
Please make sure that 'Meter configuration (external)' is performed accordingly, preferably using a 3-phase, phase-aware meter.
The following parameters only need to be set in the DLM coordinator:
9. "Meter support for external loads" parameter
- This parameter must be activated.
10. "External meter" parameter:
- Select the corresponding meter from the drop-down menu.
11. "External meter connection type" parameter:
- Indicate how the external meter is connected. In this case "external load" must be selected, so that corresponding information is present that these measured values concern solely the external load.
11. "IP address of the external Modbus TCP meter" parameter
- Indicate the IP address of the external meter. This can be found in the documentation on the external meter.
12. "Port of the external Modbus TCP meter" parameter
- Indicate the port number of the external meter. (Preset: 502)
13. "Network connection current limit" parameter
- Enter here the corresponding network connection current limit. This value is the current limit for the load management, i.e. the charging group including external loads, captured by the meter (rated current of the main fuse on the building supply line). This value is typically higher than the sub-distribution limit.
14. "External load headroom" (optional) parameter
- This value is automatically added to the measured value of the meter and serves as a safety margin to avoid transient overload situations in the voltage supply.
Once the parameters have been transmitted by NFC to the wallbox, the wallbox performs a restart. This means that DLM is fully set up and active.