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

Photocoupler

a. If there is no isolation between the AC power source and the drive 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 the earth. This could lead to equipment damage or personal injury. The AC supply is typically not referenced to earth, so there may be a high voltage between the DC bus ground and the actual earth ground. b. In most servo systems, all common grounds and earth connections are tied together at the signal end. This can create various ground loops that are prone to noise and cause current to flow between different reference points, which may interfere with system performance. c. To maintain a stable command reference voltage, it's important to connect the signal ground of the driver to the signal ground of the controller. This connection should also include the ground of the external power supply, such as the 5V supply for the encoder. Failing to do so may affect the operation of both the controller and the drive. d. Shield grounding can be complex, and there are several approaches depending on the system configuration. The correct method is to ground the shield at the reference potential point within the circuit. This point depends on whether the noise source and the 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 interference and reduce signal integrity. Additionally, always verify the grounding configuration before powering up any system. Proper grounding practices not only protect the equipment but also ensure safe and reliable operation. If in doubt, consult the manufacturer’s guidelines or seek professional advice to avoid potential hazards.