NonRecoverablErr

What does F126 mean?

A non-recoverable firmware or hardware error has been detected, causing the drive to automatically stop and reset. This is a severe internal issue that the drive cannot self-correct, indicating persistent damage to the hardware or a critical, unrecoverable software fault.

• Internal processor watchdog timer expiry caused by a critical firmware loop or stack overflow condition.
• Detection of an uncorrectable memory error (RAM or ROM) during drive operation or system boot-up sequence.
• Core ASIC (Application-Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array) malfunction due to thermal stress or component degradation.
• Critical internal power supply instability (e.g., 3.3V or 5V rail) detected by the drive's supervisory circuitry.
• Damage to a critical internal communication bus (e.g., SPI or I2C bus) preventing essential component interaction.

Click steps to track your progress.

1. 1

   Disconnect all input power (L1, L2, L3) and 24VDC control power from the drive for a minimum of 5 minutes to ensure complete internal capacitor discharge.

2. 2

   Perform a visual inspection of the drive's internal control board for signs of damage, such as burnt components, bulging capacitors, or loose connections.

3. 3

   Verify the stability and voltage level of the external 24VDC control power supply using a multimeter (e.g., measure voltage at terminals TB1, TB2) under operational load.

4. 4

   Temporarily disconnect all external I/O wiring, network cables, and motor feedback devices (e.g., encoder, thermistor input at terminal TB3) to eliminate external interference.

5. 5

   Reapply only main input power and control power, observing the drive's power-up sequence and monitoring for immediate recurrence of the fault code.