Sveba-Dahlen InF2

What does Sveba-Dahlen InF2 mean?

The InF2 fault on the SD-180 Schneider frequency converter indicates that the installed power card is fundamentally incompatible with the drive's control card. Unlike InF1, which is a size mismatch within otherwise related hardware, InF2 signals that the two cards belong to incompatible product generations, hardware revisions, or converter families and cannot work together. The drive blocks operation to protect both cards and the connected motor from damage caused by mismatched control signals.

Symptoms

• InF2 fault code displayed on the SD-180 touchscreen at power-up, typically after a card replacement
• Drive will not initialise past the hardware check stage and refuses all run commands
• Fault appears on first power-up following a maintenance event involving card replacement
• No normal operation is possible; the drive remains locked in a fault state
• May appear alongside InF1 or other hardware identification faults if multiple card issues are present

Common causes

• Power card installed is incompatible with the control card (different product generation, hardware revision, or converter family) – primary cause per manual
• Wrong replacement part sourced from a different Schneider converter product line
• Power card from a newer or older hardware revision than supported by the current control card
• Control card replaced without sourcing a compatible power card to match
• Mixing of cards from different SD-180 variants (e.g. different voltage or frame size families)

Diagnostic steps

1. 01

   Do not attempt to force-start the drive

   InF2 indicates a fundamental hardware incompatibility. Do not attempt repeated resets or force-start procedures, as operating with incompatible cards risks damaging the control card, power card, and connected motor.

2. 02

   Identify the exact part numbers of both the power card and control card

   With the drive isolated and locked out/tagged out, record the full part numbers and hardware revision codes from both the installed power card and the control card. These are typically found on labels affixed to each card.

3. 03

   Cross-reference compatibility using SD-180 service documentation

   Consult the Sveba-Dahlen SD-180 Touchscreen Manual and Schneider converter compatibility tables to determine which power card versions are approved for use with the installed control card version. Identify the correct compatible replacement power card part number.

4. 04

   Source and install the correct compatible power card

   Obtain the verified compatible power card from an authorised Sveba-Dahlen or Schneider parts supplier. Remove the incompatible card, fit the correct replacement, and ensure it is fully and evenly seated in its connector before restoring power.

5. 05

   Complete any required initialisation or memory update procedure

   After fitting the compatible power card, follow any power card registration or memory initialisation procedure specified in the SD-180 service documentation to ensure the converter correctly recognises the new card.

6. 06

   Reset the fault and perform a supervised test cycle

   Reset the InF2 fault via the SD-180 touchscreen, restore power, and run the oven through a complete supervised start and bake cycle. Confirm the drive initialises cleanly, the fault does not return, and motor operation is normal.

When to call a professional

Escalate to a certified Sveba-Dahlen or Schneider Electric technician immediately if the correct compatible replacement power card cannot be determined from available documentation, if InF2 persists after fitting a card identified as compatible, or if both the power card and control card require replacement due to damage. Running an SD-180 with incompatible converter cards is unsafe and will cause equipment damage; this fault must be fully resolved before the oven is returned to service.