Corrective maintenance
10.6 Firmware downgrade
Inverter with CU230P-2 Control Units
350 Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
When downgrading the firmware, you replace the inverter firmware by an older version. Only
downgrade the firmware to an older version if, after replacing an inverter, you require the
same firmware in all of your inverters.
● The firmware version of your inverter is at least V4.6.
● You have the memory card with the firmware that matches the inverter.
● You have backed up your settings on the memory card, in an operator panel or in a PC.
Proceed as follows to downgrade the inverter firmware to an older version:
1. Switch off the inverter power supply.
2. Wait until all LEDs on the inverter are dark.
3. Insert the card with the matching firmware into the inverter slot until it latches into place.
4. Switch on the inverter power supply.
5. The inverter transfers the firmware from the memory card into its memory.
The transfer takes approximately 5 … 10 minutes.
While data is being transferred, the LED RDY on the inverter stays red. The LED BF
flashes orange with a variable frequency.
6. At the end of the transfer, the LED RDY and BF slowly flash red (0.5 Hz).
Note
Corrupted firmware if the power supply fails during the transfer
The inverter firmware can be corrupted if the power supply fails during the transfer.
Do not switch off the inverter power supply as long as data is being transferred.
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