Instrument grounding skills

Instrumentation industry ground is also a research, and only the correct grounding in order to ensure measurement accuracy and personal and equipment safety. Today for everyone to point out ten tips to help you better ground.

First, the control system AC power should come from a separate system, separate from other equipment and use;

Second, the design of the power supply should take into account the impact of the initial current, at least to withstand 10 cycles;

Third, the control system AC ground should be established in the isolation transformer or UPS, or in the vicinity;

Fourth, the control system workstation AC power supply should use a dedicated socket;

Fifth, when connecting the field equipment power has several I / O interface adapter, should use the isolation fence;

Six, the control system AC power supply should be provided by the isolation transformer or UPS;

When the AC and DC inputs are connected to the same terminal block, the terminal block must be marked with the appropriate warning label.

Eight, AC ground wire should be equivalent to the size of the current carrying line or larger;

Nine, reserve an extra line or use a terminal box to provide test points.

X. The resistance of the grounding system must be tested to ensure that the grounding meets the requirements of the manufacturer of the control system for electromagnetic wave testing.

Instrumentation grounding regulations:

1. Instrument grounding system is divided into two kinds of protective grounding and working ground. Grounding is very important for suppressing interference signals, ensuring measurement accuracy, protecting personal and equipment safety, and ensuring high and stable output.

2. Protective grounding and electrical grounding system connected to the network, the general grounding resistance ≤ 4Ω.

3. Working grounding, including signal loop grounding, grounding shield and intrinsically safe system. The grounding of signal loop and shielding grounding are connected with the grounding system of instrument system. The resistance of grounding meets the standards of manufacturer. When an intrinsically safe grounding system is set up independently, the independent intrinsic safety grounding pole and the grounding system or other grounding system Distance ≥5.0m, grounding resistance ≤1Ω or in line with the manufacturer's standard.

4. The cable shield should be grounded at one end of the control room, connected to the grounding bus of the instrumentation, and the signal shield should be continuous throughout the cable connection.

5. Grounding wire stranded with multiple strands, using crimp connection.

6. The ground wire insulation sheath color should be yellow-green and white, both sides of the plate should indicate the type of grounding.

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