How is the servo drive and system grounded? -Solutions - Huaqiang Electronic Network

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a. If there is no isolation between the AC power source and the DC bus (such as a transformer), avoid connecting the non-isolated port of the DC bus or the ground of the non-isolated signal to earth. This can lead to equipment damage or personal injury. The AC power supply is typically not referenced to earth, so a high voltage may exist between the DC bus ground and the actual earth. b. In most servo systems, all common grounds and earth connections are joined together at the signal end. This setup can create multiple ground loops, which are susceptible to noise and can cause current to flow between different reference points, leading to instability or interference. c. To maintain a stable command reference voltage, it's essential to connect the signal ground of the driver to that of the controller. This connection should also be extended to the ground of the external power supply, as improper grounding can affect the performance of both the controller and the drive, such as causing issues with the 5V power supply for the encoder. d. Shield grounding can be complex, and there are several methods available. The correct approach is to ground the shield at a reference potential point within the circuit. This point depends on whether the noise source and receiving device are grounded or floating. Ensure that the shield is grounded at a single point to prevent ground currents from flowing through the shield, which could introduce unwanted noise or signal distortion. It's important to follow these guidelines carefully during system installation and maintenance to ensure safe and reliable operation. Proper grounding not only protects the equipment but also improves overall system performance and reduces the risk of electrical faults.