Troubleshooting

The residual-current device trips.

• Check the wiring.

After the automatic transfer switching device has switched to automatic backup operation with an audible click, the loads in the automatic backup circuit are not supplied with electric current.

• The AC cables for the BACKUP and GRID connections have been swapped over. Do not reconnect to the utility grid. Switch off the inverter and battery and set the Operation.BckTyp parameter (Configuration of the backup type) to Off. Check the installation of the automatic transfer switching device.

• Check whether the contactors have switched. Contact Service if the contactors have switched and the loads in the automatic backup circuit are still not supplied with electric current.

• The inverter carries out a cyclical insulation test at least every 24 h during the night. If the system is in automatic backup operation during the insulation test, the backup loads are not supplied for a short time until the insulation test has been completed successfully.

The automatic transfer switching device does not switch to automatic backup operation in the event of a grid failure. The connected backup loads are not supplied with electric current.

• There is not enough PV energy available or the battery is not sufficiently charged. Check the battery.

• The Operation.BckTyp parameter (Configuration of the backup type) is not set to Automatic backup operation. Set the parameter Operation.BckTyp (Configuration of the backup type) to Automatic backup operation Changing parameters.

• The time set in the Operation.BckSwOnDl parameter (Minimum duration of grid fault for start of automatic backup operation) has not yet expired. Check the time set in the parameter and adjust if necessary Changing parameters.

• The SPS IN and SPS OUT cables are not connected to the inverter correctly or have been swapped over. Check the cable connections of SPS IN and SPS OUT.

• All phases will always be monitored. If the utility grid fails on a phase, the automatic transfer switching device does not switch to battery-backup operation.

• If battery-backup operation is to be switched to in the event of a single-phase grid failure, the parameter PlntCtl.Bck.VolChkMod (Voltage monitoring mode at the point of interconnection for Backup) must be set to Single-phase.