Overvoltage in power section

What does F2817 mean?

An overvoltage condition has been detected within the drive's power section, specifically on the DC bus. This typically occurs when regenerative energy from the motor cannot be dissipated, causing the DC bus voltage to rise beyond safe limits. High DC bus voltage can damage the inverter's power semiconductors.

• Excessive regeneration from the motor during deceleration
• Braking resistor either missing, disconnected, or has too high resistance
• Braking chopper (shunting regulator) malfunction
• High inertia load causing rapid deceleration
• Mains overvoltage propagating to the DC bus

Click steps to track your progress.

1. 1

   Verify incoming AC supply voltage at the drive input terminals (L1, L2, L3) against nominal specifications.

2. 2

   Inspect external braking resistor (if present) for proper connection, physical damage, and measure its resistance to confirm it is within manufacturer's specifications.

3. 3

   Review and adjust drive deceleration ramp parameters (e.g., P-0-0504, P-0-0505) to ensure adequate deceleration times and prevent excessive regenerative energy generation.

4. 4

   Monitor the actual DC bus voltage (e.g., via parameter P-0-0010 or diagnostic display) during motor deceleration to observe the voltage peak behavior.

5. 5

   Verify the functionality of the internal or external braking chopper, including its activation threshold parameters, to ensure proper dissipation of regenerative energy.