Setting One-Level Load Shedding


The basic procedure for changing operating parameters is explained in another section Changing Operating Parameters).

One multifunction relay controls the load-shedding contactor depending on the state of charge of the battery.

Significance of the SOC thresholds:

When the state of charge of the battery reaches the lower SOC threshold, the multifunction relay opens the connected load-shedding contactor. The load-shedding contactor disconnects the loads from the stand-alone grid. When the state of charge of the battery reaches the upper SOC threshold during recharging, the multifunction relay closes the connected load-shedding contactor. The load-shedding contactor connects the loads to the stand-alone grid.

Procedure:

  1. Select Device > Load shedding 1 > Additional time range.
  2. Set the parameter Lmt value battery state of charge for start load shedding 1 to the lower SOC threshold.
  3. Set the parameter Lmt value battery state of charge for stop load shedding 1 to the upper SOC threshold. The upper SOC threshold must be at least 10 percentage points above the lower SOC threshold.
  4. Set the parameter Time load shedding 1 and the parameter Start time additional time range load shedding 1 each to the same value, e.g. to 00:00:00. This will switch the time-dependent load shedding off.
  5. If the loads are only to be reconnected when the set SOC threshold is reached, ensure that the parameter of the multifunction relay has been set to 1-stage load shedding or 1st stage with 2-stage load shedding Setting the Functions of the Multifunction Relays).
  6. If the loads are to be supplied by an external energy source during recharging of the battery, perform the following steps:
  7. If the off-grid system is a multicluster system, ensure that the parameter of the multifunction relay is set to Load shedding in Multicluster Setting the Functions of the Multifunction Relays).