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Version: 5.32

Limit management

Intro​

The Charge Controller offers a feature for managing the current or power output. Regulating the output helps:

  • Protect electrical components
  • Prevent overload situations concerning the main fuses in the installation
  • Ensures that the charger is operated within local grid codes
  • Helps to operate the chargers within contractual peak load boundaries or cost saving measures

Relevant configuration parameters​

Fixed current limiting​

Hardware Current Limit​

  1. Login on the legacy Dashboard as the Manufacturer
  2. Under Manufacturer > Master/Slave Mode set Charging Station with single feed On
  3. At the bottom of the window, click , then click to apply the changes
  4. Under Manufacturer > Master/Slave Mode set the Charging Station Hardware Current Limit [A]
  5. At the bottom of the window, click , then click to apply the changes

Defines the current-carrying capacity of a connector including the components that lead to the connector.
Scope: Single and dual connector charger

Explanation​
  • Defined by the maximum current-carrying capacity of the outlet or fixed charging cable, of built-in or required protection devices, energy meters, contactor or relays.
  • Can be set in steps of 1 Ampere from 6A to 80A.
  • Typical values are
    • 16A
    • 20A
    • 32A
    • 63A

Installation Current Limit​

  1. Login on the Dashboard as the Installer
  2. Under INSTALLATION > General Installation set the Installation Current Limit [A] (Connector 2)
  3. At the bottom of the window, click , then click to apply the changes

Defines the current carrying capacity of the upstream installation that supplies the connector.
Scope: Single and dual connector charger with a dedicated feed per connector.

Explanation​
  • Is equal to or below the Hardware Current Limit.
  • Defined by current-carrying capacity of the installation cables, protection elements or meters outside the charger.
  • Can be set in steps of 1 Ampere from 6A to 80A.
  • Setting requires local access to the charger.

Operator Current Limit​

  1. Login on the Dashboard as the Operator
  2. Under LOAD MANAGEMENT > Local set the Operator Current Limit [A] and Operator Current Limit [A] (Connector 2)
  3. At the bottom of the window, click , then click to apply the changes

Defines the maximum charging current for the connector.
Scope: Single and dual connector charger

Explanation​
  • Is equal to or below the Installation Current Limit.
  • Operators may set a limit for contractual reasons.
  • Can be set in steps of 1 Ampere from 6A to 80A also during charging sessions.

Dynamic limiting​

Charging Station Current Limit​

  1. Login on the Dashboard as the Installer
  2. Under INSTALLATION > General Installation set the Charging Station Installation Current Limit [A]
  3. At the bottom of the window, click , then click to apply the changes

This function dynamically balances the available current on dual connector chargers with a single feeding cable between the connectors.
Scope: Dual connector charger with single feeding cable.

Explanation​
  • The Manufacturer of a charging stations may enable the function with the parameter Charging Station with single feed in the Master/Slave settings of both charge controllers.
  • When enabled, the Manufacturer may set the Charging Station Hardware Current Limit on the Master controller in increments of 1 Ampere in the range of 0 to 160 A (default value: 64 A).
  • In case the station can be used with either one or two feeding cables, the Manufacturer should enable the option Setting 'Charging Station with single feed' is available to Installer on the Master controller. This allows the installer to set the chosen installation option.
  • When the function is enabled, installers may define a Charging Station Installation Current Limit in increments of 1 Ampere in the range of 0 to 160 A (default value: 64 A). This limit replaces the connector-specific Installation Current Limit.
  • The function may be combined with the Dynamic Load Balancing.

Power Limit​

  1. Login on the Dashboard as the Installer
  2. Under LOAD MANAGEMENT > Local turn Power Limiter Mode On
  3. At the bottom of the window, click , then click to apply the changes

This function limits the power supplied per connector. Scope: Single and dual connector charger.

Explanation​
  • The Installer can enable the function in the Load Management section with Power Limiter Mode.
  • The function considers the hot phases and calculates the current accordingly to not exceed the set maximum.
  • In manual configuration, the power limit can be chosen in 1 W increments between 4.140 and 43.000 Watt.
  • The progressive mode assumes a single-phase car and reduces the current after one minute when more phases are used. The conservative mode assumes a three-phase car and increased the current when less phases are used.
  • The option Slow charging (Austria) limits the maximum power to 5.5 kW per connector, using the progressive mode.
  • On dual connector chargers, the limit will be applied to both connectors individually.
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