Corrective maintenance
9.2 Firmware upgrade and downgrade
When upgrading firmware you replace the inverter's firmware with a newer version. Only
update the firmware to a newer version if you require the expanded range of functions of that
newer version.
1. Your inverter's firmware is at least version V4.5.
2. Inverter and memory card have different firmware versions.
To upgrade the inverter's firmware to a newer 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).
Converter with control units CU240D-2
252 Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB
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