Firmware Downgrade - Siemens Sinamics CU240D-2 DP Operating Instructions Manual

9. Switch off the 24 V supply or remove the connector for the
10. Wait until the LEDs on the Control Unit have gone out.
11. Mount the Control Unit on the Power Module
12. Reconnect all plugs and switch on the 24 V sup-
13. If the firmware upgrade was successful, the Con-
You have upgraded the inverter firmware to a newer version.
❒
9.3.2

Firmware downgrade

When downgrading firmware you replace the inverter's firmware with an older version. Only
update the firmware to an older level if, after replacing an inverter, you require the same
firmware in all inverters.
Requirement
● Your inverter's firmware is at least version V4.6.
● You have saved your settings onto a memory card, in an operator panel or on a PC.
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
24 V supply from the Control Unit.
Decide whether to remove the memory card from the inverter:
• You leave the memory card in place:
– There was no data back up on the memory card: ⇒ In step 13, the inverter writes
its settings to the memory card.
– The memory card contains a data backup: ⇒ In step 13, the inverter takes the
settings from the memory card.
• Remove the memory card: The inverter keeps its settings.
ply.
trol Unit responds after a few seconds with the
RDY LED lighting up green.
If the memory card is still inserted, depending on the previous content of the memory
card, one of the two following cases has occurred:
• The memory card contained a data backup: ⇒ The inverter has taken over the
settings from the memory card.
• There was no data backup on the memory card: ⇒ The inverter has written its settings
to the memory card.
Corrective maintenance
9.3 Firmware upgrade and downgrade
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