Cause : Overvoltage comes when main supply voltage too high, if you're experiencing an overvoltage fault on a Siemens V20 drive, it typically means that the DC bus voltage within the drive has exceeded the specified limit.
Here's a general guide on how to address an overvoltage fault:
-
Check Input Power: Ensure that the input power supply to the V20 drive is stable and within the specified voltage range. Fluctuations or spikes in the input power can cause the DC bus voltage to rise above the acceptable level.
-
Review Motor Parameters: Verify that the parameters of the motor connected to the VFD are correctly configured in the drive's settings. Incorrect motor parameters can lead to excessive energy feedback into the drive during deceleration or braking, causing overvoltage.
-
Inspect Load Conditions: Evaluate the load conditions and operating environment of the motor-driven system. Rapid changes in load or sudden stops of the motor can generate excess regenerative energy, contributing to overvoltage faults.
-
Adjust Control Settings: Review the control settings of the V20 drive and adjust them as necessary to optimize performance and prevent overvoltage conditions. This may involve fine-tuning parameters related to acceleration, deceleration, and braking.
-
Install Braking Resistors: In applications where regenerative energy cannot be adequately dissipated within the drive, consider installing external braking resistors. These resistors help absorb excess energy during braking and prevent overvoltage faults.
-
Monitor DC Bus Voltage: Utilize the monitoring features of the V20 drive to track the DC bus voltage in real-time. Set up alarms or warnings to alert operators when the voltage approaches or exceeds the specified limit.
- Also check the following:
• Supply voltage (P0210) must lie within limit indicated on rating plate.
• Ramp-down time (P1121) must match inertia of load.
• Required braking power must lie within specified limits.
• Vdc controller must be enabled (P1240) and parameterized properly.
