Overvoltage

What does 2 mean?

The DC-link voltage within the drive has exceeded its predefined safe operating limits. Common causes include overly short deceleration times, high overvoltage spikes from the incoming AC supply, or a very rapid Start/Stop sequence. Sustained overvoltage can lead to critical damage to the drive's DC-link capacitors and IGBTs.

• Motor regeneration during deceleration (braking) due to kinetic energy feedback to the DC-link, exceeding its voltage limit.
• Deceleration time parameter (e.g., P2-02) set too short for the inertia of the load, causing rapid DC-link voltage build-up.
• Incoming AC line voltage spikes or sustained high voltage above the drive's specified input range (e.g., 480V nominal, exceeding 500V).
• Brake chopper circuit malfunction or external braking resistor open-circuited or disconnected (if external braking is used).
• Heavy dynamic load causing the motor to act as a generator during rapid speed reduction.

Click steps to track your progress.

1. 1

   Measure the incoming AC supply voltage at the drive input terminals (L1, L2, L3) using a true RMS multimeter to confirm it is within the drive's rated input voltage range.

2. 2

   Increase drive parameter P2-02 (Deceleration Time) by 25% and observe DC-link voltage during deceleration using the drive's diagnostic display (e.g., A5-02).

3. 3

   If a braking resistor is installed, verify its resistance with a multimeter against the specified value, and check wiring to the drive's R+/RB terminals.

4. 4

   Enable or adjust the 'DC-link Overvoltage Controller' parameter (e.g., P6-10) to optimize deceleration ramp behaviour.

5. 5

   Check for sudden mechanical load reversals or rapid changes in process speed that could induce regenerative energy.