Firmware Downgrade - Siemens SINAMICS G120D Operating Instructions Manual

Corrective maintenance
9.2 Firmware upgrade and downgrade
9.2.2

Firmware downgrade

When downgrading firmware you replace the inverter's firmware with an older version. Only
update the firmware to an older level if, after replacing an inverter, you require the same
firmware in all inverters.
Precondition
1. Your inverter's firmware is at least version V4.6.
2. You have saved your settings onto a memory card, in an operator panel or on a PC.
Procedure
To downgrade the inverter's firmware to an older version, proceed as follows:
1. Remove the connector for the 24 V power supply of the Control Unit.
2. Remove the Control Unit from the Power Module.
3. Insert the card with the matching firmware into the slot on the rear side of the Control Unit
until you can feel it lock in place.
4. Attach the connector for the 24 V power supply of the Control Unit and switch the 24 V
power on.
5. The Control Unit transfers the firmware from the memory card into its memory.
The transfer takes between 5 and 10 minutes.
During the transfer, the BF LED will flash orange at a variable frequency.
Because the Control Unit is separated from the Power Module, the RDY LED will
additionally shine red.
6. At the end of the transfer, the LED RDY and BF slowly flash red (0.5 Hz).
312
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB