Load Management - Mennekes ACU Instructions D'installation

4.6.2 Load management

The ACU provides two functions for the regulation of the charging current:
 Load management
 Load balancing with reduced available total current through the downgrade input
Load management
To avoid costly expansion of the existing power distribution when using several charging stations, the use of MENNEKES load
balancing is recommended.
The maximum available total current for all connected charging points (available total current (HT) is distributed to the
individual charging points in percentage points. This ensures adequate supply of vehicles and avoids expensive power peaks.
The MENNEKES load balancing carries out this task and controls the charging current of the connected charging points in four
operating states:
1. If only a few vehicles are charged, the maximum individual charging current is available for each vehicle. The load
balancing does not intervene as long as the available total current (HT) is not exceeded.
Two vehicles charge each with 32 A. Control is not necessary because there is sufficient charging current
Fig. 10: Example load balancing operating status 1
2. If there are more vehicles and the available total current (HT) is exceeded, load balancing will intervene. The charging
currents are reduced in percentage terms for all vehicles in order to achieve a 100% utilization if possible. The available
total current (HT) is not exceeded. The minimum charging current of the connected vehicles does not fall below.
If four vehicles are connected, the charging currents are reduced evenly to 24 A.
Fig. 11: Example load balancing operating status 2
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