Sveba-Dahlen InFE

What does Sveba-Dahlen InFE mean?

The SD-180's Schneider frequency converter has detected an error in its internal microprocessor. The CPU is responsible for all drive control functions including modulation, protection, and communication. An InFE fault means the converter's core processing hardware or its associated memory/firmware has encountered a condition it cannot recover from autonomously.

Symptoms

• InFE fault code shown on the SD-180 touchscreen
• Converter is completely non-operational and will not accept run commands
• Fault typically persists through repeated power cycles without clearing
• Touchscreen may show erratic behaviour or fail to display parameters correctly
• All converter outputs remain de-energised regardless of control inputs

Common causes

• Hardware failure of the microprocessor or associated memory components on the converter control board
• Firmware corruption caused by a power interruption during a firmware update
• Severe electrical transient or ESD event damaging the CPU circuitry
• Internal hardware fault on the converter control PCB affecting CPU operation
• Incompatible or corrupted firmware loaded onto the converter control board

Diagnostic steps

1. 01

   Attempt a controlled power cycle

   Isolate the SD-180 at the main isolator, wait 2 minutes, then restore power to allow the converter to re-initialise. Check whether InFE clears on the touchscreen after a cold restart.

2. 02

   Attempt a factory reset if accessible

   If the touchscreen is responsive, navigate to the converter parameter menu and attempt a full factory reset per the SD-180 service manual. If the menu is inaccessible due to the fault, proceed to the next step.

3. 03

   Isolate and inspect for physical damage

   Lock out the SD-180, wait 5 minutes for DC bus discharge, and inspect the converter control board for burn marks, swollen components, or any sign of electrical damage near the CPU or memory components.

4. 04

   Check firmware version and integrity

   If an authorised firmware update tool is available and the board is partially accessible, verify the firmware version loaded matches the version required for this SD-180 converter variant per the service manual.

5. 05

   Document all findings for escalation

   Record the exact fault conditions, all reset attempts made, any visible damage found, and the converter's firmware version and serial number before escalating to a specialist.

When to call a professional

InFE is a critical internal CPU fault that almost always requires control board replacement or specialist firmware recovery by an authorised Sveba-Dahlen or Schneider drive technician. Do not attempt to continue operating the oven with this fault active. Escalate promptly, providing the converter serial number, firmware version, and a full account of events preceding the fault.