Overvoltage fault

What does F2 mean?

The DC-link voltage has surpassed the drive's protective limits (e.g., above 911 Vdc for a 500 Vac unit or 1200 Vdc for a 690 Vac unit). This can be a hardware trip or sustained overvoltage due to control supervision. Persistent overvoltage can damage power components and reduce drive lifespan.

• Rapid deceleration of a high-inertia load without adequate braking (dynamic braking resistor or regenerative unit).
• High incoming line voltage exceeding the drive's input voltage rating (e.g., >480VAC for a 400VAC rated drive).
• Drive's internal braking chopper circuit failure or incorrectly sized/faulty braking resistor.
• Regenerative load operation when the drive is not equipped for regeneration, causing DC bus voltage to rise.
• Malfunctioning DC-link voltage measurement circuit within the drive.

Click steps to track your progress.

1. 1

   Measure the incoming line voltage at the drive input terminals (L1, L2, L3) using a true RMS voltmeter. Verify it is within the drive's specified operating range (e.g., 380-480VAC).

2. 2

   If rapid deceleration is a factor, check the braking resistor (if installed) for proper ohmic value (e.g., 20 ohms) and continuity using a multimeter. Ensure braking resistor parameters (e.g., P2-10 'Braking Resistor Value') are configured.

3. 3

   Increase the deceleration ramp time (e.g., Parameter P3-42 'Deceleration ramp 1 time') to reduce regenerative energy feedback.

4. 4

   Verify that there is no external source feeding voltage into the motor during deceleration (e.g., another drive or generator action).

5. 5

   Monitor DC-link voltage in the drive's display or control panel (e.g., Menu 1-10 'DC-link voltage') during operation. Compare to drive specifications (e.g., ~1.35 * nominal line voltage).