Detailed description of integrated wiring specifications

There are many things worth learning about the Integrated Wiring Specification. Here we will mainly introduce the Integrated Wiring Specification, including the Integrated Wiring Specification and the questions about the grounding, and hope to help you, I believe that you can learn more. In the control system, multiple inverters are controlled using the analog quantity of PLC. the characteristics of the inverter itself produce strong interference signals and the capability of analog anti-interference is not as powerful as that of digital data; therefore, in order to eliminate the interference of the inverter on analog data to the greatest extent, more rigorous measures are required in terms of integrated wiring specifications and grounding.

I. Generic Cabling specifications
1. The signal line and power line must be separated
When using analog signal for remote control of the inverter, in order to reduce the interference of the analog signal from the inverter and other equipment, please separate the signal line of the control inverter from the strong electrical circuit (main circuit and downstream control circuit. The distance should be above 30cm. Such integrated wiring specifications should be maintained even in the control cabinet. The control return route between the signal and the inverter cannot exceed 50 m.

2. The signal line and power line must be placed in different metal pipes or metal hoses respectively.
Because the two Fuji inverters in the water system are 30 m and 20 m far away from the control cabinet, if the signal lines connecting the PLC and the inverter are not placed in the metal pipe, it is vulnerable to interference from the inverter and external equipment. At the same time, because the inverter does not have a built-in reactor, the input and output power lines of the inverter will produce strong external interference, therefore, the metal pipe or metal hose placed in the signal line must be extended to the control terminal of the inverter to ensure that the signal line is completely separated from the power line.

3. The analog control signal line should use double stranded shielded wires. The wire specification is 0.5 ~ 2mm2. Required during Wiring
Note that the cables should be as short as possible (about 5-7mm). At the same time, insulation adhesive tape should be used to pack the shield layer after the cables are stripped to prevent interference from the contact with other devices.

4. In order to improve the simplicity and reliability of the wiring, it is recommended to use the pressure wire rod terminal on the signal line.

5. Note the following before using the presser terminal:

Ii. Grounding
1. the grounding of the inverter should be independently grounded with the PLC control circuit. In order to reduce the interference of the inverter on the controller, the grounding of the control circuit can be float, however, the inverter must ensure reliable grounding. In the control system, it is recommended that the two ends of the shielded line of the analog signal line be flushed. At the same time, because the PLC and the inverter share the same land on the Unit, it is recommended that, if possible, separate the PLC from the ground or separate the PLC from the ground of the unit.

2. inverter grounding
V level: Class C grounding (Grounding Resistance less than 10 Ω ).
Do not share the grounding wire with the welding machine and power equipment.
The grounding wire must comply with the wire diameter specification specified by the technical benchmark of electrical equipment.
For example, 35KW frequency converter grounding wire diameter is recommended to be 22mm2, 87KW grounding wire diameter is recommended to be 50mm2.
The grounding wire should be as short as possible. Due to the electric leakage of the inverter, the potential of the grounding terminal is unstable if the distance from the grounding point is too long.

3. The connection distance between the inverter and the motor.
When the connection distance between the inverter and the motor is long, the higher harmonic current from the cable will adversely affect the inverter and peripheral equipment. Therefore, to reduce the interference of the inverter, the carrier frequency of the inverter needs to be adjusted.

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2. Adhere to the sustainable development of data center cabling systems
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