Corrective maintenance
9.2 Firmware upgrade and downgrade
Converter with control units CU250D-2
314 Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
Correcting a failed firmware upgrade or downgrade
How does the inverter report a failed upgrade or downgrade?
The inverter signals a failed firmware upgrade or
downgrade with a quickly flashing RDY LED and a
lit up
BF LED.
Correcting a failed upgrade or downgrade
To correct a failed firmware upgrade or downgrade you can check the following:
● Does the firmware version fulfill the requirements of your inverter?
– For an upgrade at least V4.5.
– For a downgrade at least V4.6.
● Have you inserted the card properly?
● Does the card contain the correct firmware?
● Repeat the appropriate procedure.
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