Internal fault

What does ALARM 38 mean?

An internal fault has occurred within the frequency converter, indicated by a specific code number defined in Table 6.1. This signifies a malfunction in the drive's internal electronics or software, requiring further investigation to prevent potential damage.

• Malfunction or component failure on the frequency converter's control board or power board.
• Corrupted firmware or application software within the drive's CPU, requiring a re-flash or factory reset.
• Over-temperature condition on an internal component (e.g., IGBT module, heatsink) triggering a protective shutdown.
• Instability or failure of an internal DC power supply rail (e.g., 24VDC, 5VDC) providing power to internal electronics.
• Electromagnetic interference (EMI) causing transient errors in internal communication or logic circuits.

Click steps to track your progress.

1. 1

   1. Note the specific internal fault code (if available, e.g., from display or fault log) for precise diagnosis.

2. 2

   2. Power cycle the frequency converter (main input power off for a minimum of 5 minutes) to reset internal states.

3. 3

   3. Verify ambient operating temperature is within specification and ensure cooling fans are operational and not obstructed.

4. 4

   4. Perform a factory reset (e.g., Parameter P14-22 Load defaults) and re-enter all parameters from a known good backup.

5. 5

   5. Check for proper seating of all internal ribbon cables and plug-in modules on the control board.

6. 6

   6. If persistent, replace the frequency converter's control board or the entire unit based on specific fault code guidance.