Corrective maintenance
10.10 Firmware downgrade
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
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6. At the end of the transfer, the BF LED will slowly flash red (0.5 Hz).
Note
Damaged firmware if the power supply is interrupted while transferring data
If the power suppl
y is interrupted while transferring data, this can damage the inverter's
Do not switch off the inverter's power supply while data is being transferred.
7. Switch off the 24 V supply or remove the connector for the 24 V supply from the Control
Unit.
8. Wait until the LEDs on the Control Unit have gone dark.
Decide whether to remove the memory card from the inverter:
– You leave the memory card in place:
If the memory card already includes a data backup, in the next step the inverter
imports the settings from the memory card.
Note
The inverter imports the settings from the memory card.
The next steps can change the inverter settings.
If the memory card already contains settings, check whether the settings are
suitable for the inverter.
If the settings are not suitable for the inverter, remove the memory card.
– You remove the memory card:
The inverter is reset to the factory setting.
9. Mount the Control Unit on the Power Module.
10.Reconnect all plugs and switch on the 24 V supply.
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