Cause : Reduced run comes when number of inverter modules detected does not match the value of parameter 95.13 Reduced run mode.

1. Check that the value of 95.13 Reduced run mode corresponds to the number of inverter modules present.
2. Check that the modules present are powered from the DC bus and connected by fiber optic cables to the BCU control unit.
3. If all modules of the inverter unit are in fact available (eg. maintenance work has been completed), check that parameter 95.13 Reduced run mode is set to 0 (reduced run function disabled).