Sveba-Dahlen InF1 Error Code

What does Sveba-Dahlen InF1 mean?

The InF1 fault on the SD-180 Schneider frequency converter indicates that the power card currently installed in the drive does not match the power card identity (size/rating) stored in the converter's non-volatile memory. This comparison is performed at power-up to ensure the drive is not operated with a mismatched power stage. InF1 typically arises after a power card is replaced with one of a different power rating or from a different drive size.

Symptoms

• InF1 fault code displayed on the SD-180 touchscreen at power-up following a power card replacement
• Drive will not proceed past initialisation and refuses to accept a run command
• Fault appears immediately on energisation, before any start command is issued
• No prior symptoms during normal operation; fault is directly linked to a maintenance event
• Drive may display additional size or hardware mismatch warnings alongside InF1

Common causes

• Power card replaced with one of a different power rating or drive size than the original (primary cause per manual)
• Incorrect replacement part ordered or fitted during a service event
• Power card from a different SD-180 unit installed without updating the converter memory
• Memory corruption in the converter storing an incorrect reference power card identity
• Power card partially or incorrectly seated, causing misidentification at initialisation

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Diagnostic steps

1. Confirm the power card replacement history

   Review maintenance records to establish whether a power card was recently replaced in the SD-180. InF1 is directly linked to a card swap event and should not appear without one.

2. Verify the part number of the installed power card

   With the drive isolated and locked out/tagged out, locate the part number label on the installed power card and compare it against the original card's part number from the maintenance record and the SD-180 service documentation. The rating and size must match exactly.

3. Replace the power card with the correct matching unit if mismatched

   If the installed card is confirmed to be the wrong size or rating, remove it and fit the correct power card as specified in the Sveba-Dahlen SD-180 service documentation. Do not attempt to operate the drive with a mismatched power stage.

4. Reseat the power card if the part number is correct

   If the power card part number is correct, a seating issue may be causing misidentification. Carefully remove and firmly reseat the card in its connector, ensuring even and full engagement, then restore power and observe the startup sequence.

5. Update converter memory to recognise the new card if required

   If the correct replacement card is installed but InF1 persists, the converter memory may need to be updated to register the new card's identity. Refer to the SD-180 Touchscreen Manual for the specific memory update or initialisation procedure applicable after a power card replacement.

6. Reset the fault and verify normal operation

   After fitting the correct card and completing any required memory update procedure, reset the InF1 fault on the touchscreen and perform a supervised start cycle. Confirm the drive initialises cleanly without returning InF1 or any related hardware fault.

When to call a professional

Escalate to a certified Sveba-Dahlen service technician if the correct replacement power card cannot be confirmed from available documentation, if InF1 persists after installing a verified correct card, or if the converter memory update procedure is not clearly covered by your service authorisation. Installing an incorrectly rated power card and attempting to clear the fault without resolving the root mismatch risks permanent damage to the converter and connected motor.