Hardware reset of digital signal processor
Danfoss · VLT AutomationDrive FC 301/302
What does 1792 mean?
The digital signal processor (DSP) has undergone an unexpected hardware reset. This could be due to a transient power issue, an internal watchdog timer, or a deeper hardware malfunction.
Common Causes
- Brief sag or interruption of the internal 3.3VDC or 5VDC power supply rail to the Digital Signal Processor (DSP).
- Exceeding the DSP's operational temperature limits due to inadequate cooling or high ambient conditions.
- Internal watchdog timer expiration triggered by a critical software deadlock or an infinite loop.
- Electromagnetic interference (EMI) ingress affecting the DSP clock or critical data lines.
- Component failure (e.g., crystal oscillator, decoupling capacitor) associated with the DSP circuit.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Verify the stability of the 24VDC, 5VDC, and 3.3VDC internal power supply rails at the DSP test points using an oscilloscope.
- 2
Check the drive's internal fan operation and ensure heatsinks are free of dust or obstructions.
- 3
Inspect for loose connections on the main control board and any DSP daughter cards.
- 4
Measure the ambient temperature within the control cabinet to confirm it is within specified limits (e.g., 0-50°C).
- 5
Isolate potential sources of EMI by checking grounding connections and ensuring proper cable routing.