The multifunction relay can have the following operating modes in Sunny Island Systems:
- Off: Off; the multifunction relay is permanently idle.
- On: On; the multifunction relay is permanently activated.
- AutoGn:Automatic generator request; the Sunny Island automatically requests the generator. In the event of a generator request, the multifunction relay is activated.
- AutoLodExt: Single-level load shedding. When the generator is connected, the Sunny Island stops the load shedding. When the loads are to be shed, the multifunction relay is deactivated.
- AutoLod1Soc: Single-level load shedding or first level of two-level load shedding When the upper SOC threshold is reached, the Sunny Island ends load shedding. When the loads are to be shed, the multifunction relay is deactivated.
- AutoLod2Soc: Second level of two-level load shedding When the upper SOC threshold is reached, the Sunny Island ends load shedding. When the loads are to be shed, the multifunction relay is deactivated.
- Tm1: Timer 1; the Sunny Island controls external processes dependent on time. When the set time #243 Timer is reached, the multifunction relay is activated.
- Tm2: Timer 2; the Sunny Island controls external processes dependent on time. When the set time #243 Timer is reached, the multifunction relay is activated.
- ExtPwrDer*:Control of additional loads; the Sunny Island controls additional loads in order to put excess energy to practical use. When excessive energy can be used, the multifunction relay is activated.
- GnRn: Relay is activated when generator is running; when the generator is in operation, the multifunction relay is activated.
- ExtVfOk: Relay is activated when external source is present; when the voltage and frequency of the external energy source are within the valid range for connection, the multifunction relay is activated.
- GdOn: Relay is activated when utility grid is present; when the utility grid is connected, the multifunction relay is activated.
- Error:Relay is deactivated during error; when an error message is pending, the multifunction relay is deactivated.
- Warn:Relay is activated during warning; when a warning is pending, the multifunction relay is activated.
- Run: Relay is activated when cluster is running; when the Sunny Island or the cluster is in operation, the multifunction relay is activated.
- BatFan: Relay is activated when battery room fan is running; the Sunny Island controls the battery room fan for all clusters together. When the battery room is to be ventilated, the multifunction relay is activated.
- AcdCir: Relay is activated when the electrolyte pump is running; the Sunny Island controls the electrolyte pump of the battery. When the electrolyte is to be circulated, the multifunction relay is activated.
- MccBatFan: Relay is activated when battery room fan is running; the Sunny Island controls the battery room fan for all clusters together. When the battery room is to be ventilated, the multifunction relay is activated.
- MccAutoLod: Load shedding in the Multicluster System.
When all batteries have reached the upper SOC threshold, the Sunny Island ends load shedding. When the loads are to be shed, the multifunction relay is deactivated.
- SiComRemote: Multifunction relay is controlled via ComSync.
- Overload: When the Sunny Island limits its power, the multifunction relay is deactivated.
- GriSwt: Triggering of the contactors for grid disconnection in the battery-backup system.
- GndSwt: Triggering of the the grounding in the battery-backup system.
- GriRdtSwt: Triggering of the redundant contactor for grid disconnection in the battery-backup system.
*If this parameter is used, the following parameters also have to be configured:
ExtPwrDerMinTm: Minimum time for the multifunction relay function ExtPwrDer in minutes.
ExtPwrDerDltVtg: Voltage drop for the multifunction relay function ExtPwrDer in V. The voltage drop is based on the cell voltage of the battery.