OverVoltage

What does F005 mean?

The DC bus voltage has exceeded its maximum safe limit. Common causes include excessively high incoming AC line voltage, transient voltage spikes, or regenerative energy from the motor during rapid deceleration. Persistent overvoltage can damage the drive's internal power components.

• Excessively high incoming AC line voltage exceeding the drive's maximum operating threshold (e.g., 480V for a 400V class drive).
• Rapid deceleration of a high-inertia motor without sufficient braking resistor capacity or regeneration capabilities enabled.
• Faulty braking chopper circuit or disconnected/open-circuited braking resistor, preventing regenerative energy dissipation.
• Parameter P2-02 (Deceleration Time) set too short for the mechanical system's inertia, leading to rapid energy return to the DC bus.
• Transient voltage spikes on the incoming AC line from switching operations or lightning activity.

Click steps to track your progress.

1. 1

   Measure the incoming AC line voltage (L1-L2, L2-L3, L3-L1) at the drive's input terminals (R, S, T) with a true-RMS voltmeter, verifying it does not exceed the drive's maximum input specification.

2. 2

   Verify the braking resistor connection at terminals (e.g., R+, R-) and measure its resistance value with an ohmmeter to confirm it matches the drive's specification.

3. 3

   Increase the deceleration ramp time (P2-02 [Deceleration Time]) in 1-second increments to reduce regenerative energy during stops, allowing more time for dissipation.

4. 4

   Check for proper configuration of braking-related parameters (e.g., P2-08 [Brake Chopper Control], P2-09 [Brake Resistor Value]) according to the installed braking hardware.

5. 5

   Monitor the DC bus voltage (P0-03 [DC Bus Voltage]) during deceleration to observe its peak values and compare with the overvoltage trip threshold.