Undervoltage in power section

Hva betyr F2026 ?

The DC bus voltage in the drive's power section has dropped below the minimum acceptable threshold. This indicates insufficient power available for motor operation.

• Insufficient incoming AC mains voltage (see E2814).
• Excessive load causing a momentary drop in DC bus voltage.
• Faulty rectifier stage or pre-charge circuit in the drive.
• Internal power supply issue within the drive.

Klikk på steg for å spore fremgangen.

1. 1

   Measure the incoming AC mains voltage at the drive's input terminals and ensure it is stable and within specified limits.

2. 2

   Check the DC bus voltage at the +UDC/-UDC terminals on the drive during operation and ensure it remains above the undervoltage threshold.

3. 3

   Verify that the drive is correctly sized for the motor and application load, avoiding momentary overloads.

4. 4

   Inspect the pre-charge resistors and contactors/relays for proper functionality if the fault occurs during power-up.