The AC power for the control system should come from a separate system, isolated from other equipment and usage.
The power supply should account for the initial current surge during design, capable of withstanding at least 10 cycles.
The AC control system grounding should be established on an isolation transformer or UPS, or in the vicinity.
The AC power supply for the control system workstations should use a dedicated outlet.
When connecting several I/O interface converters to on-site equipment power sources, it is recommended to use isolated baffle strips.
6. Isolation transformers or UPS are powered by AC power from the control system; 2. Aerial ground power, 1. 36V aerial power, 7. 400Hz variable frequency power supply, 2. 115/200V power supply, 5. 27V DC power supply, 12. 400Hz power supply, aerial power supply.
7. When AC and DC input connections are connected to the same terminal block, the terminal block must be clearly labeled with appropriate warning signs.
The AC grounding wire should be of the same size or one size larger than the conductor wire.
Reserve an extra wire or use a terminal box to provide a testing point.
The resistance of the grounding system must be tested to ensure it meets the requirements of the control system manufacturer and allows for testing with electromagnetic wave testers, relay protection testers, loop impedance testers, and multifunctional testers.
