Siemens Sinamics G110M Original Instructions Manual page 285

7. Once the transfer is completed, the RDY and BF LEDs flash slowly red (0.5 Hz).
Note
Damaged firmware due to a supply voltage interruption during transfer
If the power supply fails during the transfer, this can damage the inverter's firmware.
• Do not switch off the inverter's supply voltage while the transfer is running.
8. Switch off the 24 V inverter power supply voltage or the 400 V inverter supply.
9. Remove the Power Module.
10.Withdraw the card with the firmware from the Power Module.
11.Mount the Power Module.
12.Switch on the 24 V inverter power supply voltage or the 400 V inverter supply.
13.If the firmware downgrade was successful, after several seconds the inverter LED RDY
turns green.
Following the firmware downgrade the inverter is reset to factory settings.
14.Take your settings over from your data backup to the inverter.
See also section: Data backup and series commissioning (Page 261).
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
Service and maintenance
10.5 Firmware downgrade
285