Siemens CU240B-2 - Firmware Downgrade

Corrective maintenance
8.2 Firmware upgrade and downgrade
Converter with the CU240B-2 and CU240E-2 Control Units
394 Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
8.2.2
Firmware downgrade
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.
Precondition
● The firmware version of your inverter is at least V4.6.
● Inverter and memory card have different firmware versions.
● You have backed up your settings on the memory card, in an Operator Panel or in a PC.
Procedure
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 i
n-
verter slot until it latche
s into place.
4.
Switch on the inverter power supply again.
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.