OU

What does 1020 mean?

An overvoltage condition exists in the DC bus, where the DC bus voltage is higher than the value set in parameter C0173. This is typically caused by excessive braking energy being fed back to the bus.

• Rapid deceleration of high-inertia loads without adequate braking resistors or regenerative capabilities.
• Braking resistor (if installed) has a broken wire, incorrect resistance value (e.g., too high), or insufficient power rating, preventing energy dissipation.
• DC bus overvoltage threshold (Parameter C0173) is set too low for the application's dynamic requirements, triggering premature trips.
• Input voltage spikes or transients on the mains supply, momentarily exceeding the drive's maximum input voltage rating.
• Faulty regeneration circuit within the drive, failing to dissipate or manage regenerative energy.

Click steps to track your progress.

1. 1

   1. Measure the actual DC bus voltage (e.g., via drive display parameter P0003) during deceleration cycles and compare it to the drive's specified maximum DC bus voltage.

2. 2

   2. Verify the braking resistor (if installed) is correctly connected to terminals X1/1 and X1/2 and has the specified resistance (Ω) value and sufficient power rating.

3. 3

   3. Increase the deceleration time (e.g., Parameter C0027) to reduce the rate of energy feedback to the DC bus, allowing more time for dissipation.

4. 4

   4. Check input line voltage (R, S, T) with a multimeter for stability and the absence of significant voltage spikes or overvoltages.

5. 5

   5. Adjust the DC bus overvoltage threshold (Parameter C0173) if safe and within the drive's operational limits, to provide more margin.