Siemens CU240B-2 Operating Instructions

9.3.2 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.
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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.
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4. Switch on the inverter power supply again.
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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 in‐
verter stays red. The LED BF flashes orange with a varia‐
ble frequency.
6. At the end of the transfer, the LED RDY and BF slowly flash red
(0.5 Hz).
Power supply failure during transfer
The inverter firmware will be incomplete if the power supply fails
during the transfer.
● Start again with Step 1 of these instructions.
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Corrective maintenance
9.3 Firmware upgrade and downgrade
Converter with the CU230P-2 Control Units
430 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE

Siemens CU240B-2 Specifications

General

Brand	Siemens
Model	CU240B-2
Category	Inverter
Language	English