Troubleshooting

The residual-current device trips.

• The grounding conductor connection between N and the busbar in the inverter has not been removed. Remove grounding conductor connection ( > Removing the grounding conductor connection on the inverter).

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.

• 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.

• Check the fuses of the automatic transfer switching device.

• 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.
  A firmware version of at least 3.12.15.R is required to be able to set the parameters for backup operation. If a firmware version lower than this is installed, update the firmware of the inverter.

• The time set in the parameter Operation.BckSwOnDl (Minimum duration of grid fault for start of automatic backup operation) has not yet elapsed. 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.

If external factors lead to an impermissibly high temperature of the closure system of the automatic transfer switching device, the lid of the automatic transfer switching device can no longer be opened.

• Remove the external heat source and wait until the automatic transfer switching device is back within the permitted temperature range. The lid can then be opened again.

The LED on the automatic transfer switching device does not light up even though the utility grid is available.

• The pre-fuse of the monitoring relay is switched off. Switch the fuse back on.

• The monitoring relay is damaged.

Automatic backup operation continues after a grid failure and transfer, even after grid power is restored.

• The B6 pre-fuse under the protective cover ( > Overview of the Connection Area) must be switched on.