Voltage Limit (DC-link voltage insufficient)

What does 64 mean?

The combination of the current load and motor speed demands a motor voltage higher than the actual DC-link voltage available in the frequency converter. This indicates that the drive cannot supply the necessary voltage for the commanded operation, potentially due to a low DC-link, excessive load, or too high a speed command for the input voltage.

• Incoming AC line voltage sag, undervoltage, or complete loss of one or more phases to the drive.
• Internal failure of the drive's input rectifier bridge or DC-link capacitors.
• Excessive motor load demand (beyond drive capacity) causing the DC-link to sag.
• Input line reactor is undersized or incorrect for the application, or excessive line impedance.
• Incorrect input voltage setting in drive parameters (e.g., P14-00) for the actual supply.
• Rapid deceleration ramp (P2-11) is set too short for the load, causing regenerative energy to overload the DC-link.

Click steps to track your progress.

1. 1

   1. Measure the incoming AC line voltage (L1-L2, L2-L3, L3-L1) at the drive's input terminals using a multimeter during operation.

2. 2

   2. Monitor the DC-link voltage in the drive's display (e.g., P16-01) during operation and compare to its nominal value.

3. 3

   3. Reduce the motor load or commanded speed temporarily to see if the fault clears, indicating an overload.

4. 4

   4. Verify Parameter P14-00 (Mains Voltage) matches the actual incoming AC line voltage (e.g., 400V, 480V).

5. 5

   5. Inspect drive's input rectifier and DC-link capacitors for visual signs of damage (e.g., bulging, leakage).

6. 6

   6. If regenerative energy is a factor, extend Parameter P2-11 (Deceleration Ramp 1) or install a braking resistor.