# Configuration

> Set up Fluvius Fall-Back Flex in the Voltmasters platform, step by step: P_base, the flex scope, P_red, day-ahead planning with programs and certificate, the flexible devices and the test.

Source: https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/fall-back-flex/configuration/

Fall-Back Flex is configured in the DSO RTU settings, under **Configuration → Grid & market → DSO RTU settings**, with **Fluvius Netflex** as provider. It builds on a working Netflex link, see [Configuring Fluvius telecontrole](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/configuration/).

## What you need

| Data | Source |
| --- | --- |
| P\_base (contractual consumption power, kW) | Bid form |
| P\_red (reduced power, kW) | Bid form of the awarded bid |
| Registered flexible consumption power (kVA) | Zone sheet (ask the customer) |
| Day-ahead steering required: yes or no | Zone sheet |
| Asset point id and program ids | Fluvius (only with day-ahead steering) |
| Client certificate and private key | Customer, see [Planning certificate](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/fall-back-flex/planning-certificate/) (only with day-ahead steering) |

> **Note**
>
> Start the certificate first when the zone requires day-ahead steering: it has the longest lead time.

## Step by step

1. **Enter P\_base in the grid settings**
   
   Under **Configuration → Grid & market → Grid settings**, set the consumption **access power** to P\_base from the bid form. It is the 100 % reference of every Fluvius limit. Without it, Fall-Back Flex cannot steer.
2. **Fill in the flex scope**
   
   In **Flex according to the study**: switch **Technical flex imposed** on only when the study imposes it, and enter the **Registered flexible consumption power** from the zone sheet.
3. **Enable Fall-Back Flex**
   
   Switch **Fall-Back Flex** on and enter **P\_red**. Check the flexible volume the form shows against the bid form.
4. **Set up day-ahead planning (when required)**
   
   Switch **Day-ahead planning required** on, enter the asset point id, map the programs and upload the certificate and the private key.
5. **Make the flexible consumption controllable**
   
   Add the battery, the EV chargers and the controllable loads under **Configuration → Devices**, each with its nominal power. Give the loads a **Priority**: 1 is switched off last. Check that channel 6 in the [Netflex measurement channels](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/configuration/#5-netflex-measurement-channels) covers the registered flexible consumption power.
6. **Save and check the controller**
   
   Save the form. The controller picks up the settings within a minute. If its software is too old for Fall-Back Flex, the form and the Fall-Back Flex page say so: update the controller first.
7. **Test**
   
   Ask Voltmasters support for a test limit (for example 80 %) and follow it on the [Fall-Back Flex page](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/fall-back-flex/monitoring/): the net consumption must be below the limit within 3 minutes. Then plan the commissioning test with Fluvius (reason code 99), see [Commissioning & certification](https://voltmasters.io/en/docs/dso-rtu/commissioning-and-certification/).

## What Fluvius watches during an activation

Fluvius settles on the billing meter, but the Netflex cabinet also watches **channel 6** (flexible consumption): during a limit, that is where Fluvius expects the power to drop.

-   Everything the zone sheet counts as flexible consumption goes in channel 6, the battery included.
-   EV charging stays separate, in channel 5.
-   Without technical flex the asset channels (1, 2, 3, 4 and 7) stay empty.

The channel per device is set in the [Netflex measurement channels](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/configuration/#5-netflex-measurement-channels), which also compare channel 6 with the registered flexible consumption power.

> **Warning**
>
> Classic mistake: channel 6 well below the registered power. Fluvius then sees only part of the volume drop and counts the service as not delivered, even though the site did reduce.

## Flex according to the study

![Voltmasters EMS: Flex according to the study, with the Technical flex imposed switch off and a registered flexible consumption power of 250 kVA](https://voltmasters.io/assets/docs/fluvius-flex-scope.webp)

*The flex scope decides which measurement channels Fluvius expects.*

| Field | What to enter |
| --- | --- |
| **Technical flex imposed** | Off for a connection with only Fall-Back Flex. On when the study also imposes technical flex. |
| **Registered flexible consumption power (kVA)** | The flexible consumption power the zone sheet registers for channel 6. |

## Fall-Back Flex

![Voltmasters EMS: the Fall-Back Flex section of the DSO RTU settings, with the switch on, P_base 500 kW read-only, P_red 300 kW and a flexible volume of 200 kW](https://voltmasters.io/assets/docs/fall-back-flex-settings.webp)

*P_base comes from the grid settings, P_red from the bid.*

| Field | What to enter |
| --- | --- |
| **Fall-Back Flex** | On when Fluvius awarded a Fall-Back Flex bid for this connection. |
| **P\_base (contracted consumption power)** | Read-only, from the grid settings. If it is missing, the form links to the grid settings. |
| **P\_red (offered power limit)** | The reduced power of the bid, in kW. It must be below P\_base. |

## Day-ahead planning

![Voltmasters EMS: the Day-ahead planning section with the switch on, the asset point id, an empty planning API base URL and one program mapped to the connection point](https://voltmasters.io/assets/docs/fall-back-flex-day-ahead-settings.webp)

*Day-ahead planning: asset point id and one program per steering product.*

| Field | What to enter |
| --- | --- |
| **Day-ahead planning required** | On when the zone sheet says "Mandatory implementation of day-ahead steering: yes". The fields below only appear then. |
| **Asset point id** | The asset point Fluvius linked the certificate to. |
| **Planning API base URL** | Leave empty. Only fill it in when Fluvius gives you another URL. |
| **Programs** | Every program id Fluvius announced, with its **Reference power**: *Connection point* or *Assets*. See [Programs](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/fall-back-flex/day-ahead-planning/#programs). |
| **Client certificate (PEM)** | The certificate Fluvius registered. |
| **Private key (unencrypted PEM)** | The key that belongs to the certificate. |
| **CA certificate of the Fluvius server** | Optional. |

![Voltmasters EMS: the Client certificate part of the day-ahead planning settings, showing the stored certificate thumbprint and its expiry date above the upload fields](https://voltmasters.io/assets/docs/fall-back-flex-certificate-settings.webp)

*After the upload only the thumbprint and the expiry date are shown.*

On upload the platform checks that the certificate is readable, not self-signed and not expired, that the key has at least 2048 bits and that it matches the certificate.

> **Warning**
>
> Switching day-ahead planning off deletes the asset point id, the programs and the stored certificate. Switching Fall-Back Flex off clears P\_red.