Instrument grounding point1

Grounding is a method of instrument and meter industry, only the correct ground to ensure measurement accuracy and the safety of person and equipment. Engineering and points out that the ten tips for everyone, today can help you better grounding.

one, the control system of AC power supply should be https://www. rtdcn。 Com/in a separate system, and other equipment and use separate;

2, the power supply should be considered in the design of the impact of the initial current, able to withstand at least 10 cycles;

3, the control system of AC ground should be set up on the isolation transformer or UPS, or nearby.

4 AC power supply, control system workstation should use special socket;

5, when you have several IO interface adapter connect field devices power, should use gelizha;

6, the control system of AC power supply should be determined by the isolation transformer or UPS supply;

7, when AC and DC input connected to the same row, wiring connection line will be marked with appropriate warning labels;

eight, AC ground wire with load flow model should be fairly or a bigger size;

9, set aside the additional thread or use a terminal box, to provide the test point.

10, the resistance of the grounding system must be tested to ensure that the earth can satisfy the requirement of control system manufacturer of electromagnetic wave test.

instrument grounding requirements:

1 instrument grounding system is divided into protective earthing and work two kinds. Ground to suppress interference signal, ensure accuracy of measurement, protection of personal and equipment safety, ensure high and stable yield plays an important role.

2 protective earthing connected to the electrical system grounding network, general earthing resistance Ω 4 or less.

3 working grounding includes signal circuit grounding, shielding grounding and safety system. The signal circuit grounding and shielding and connected to ground net. through instrument system, grounding resistance factory standard; Independent setting in the grounding system, separate in the grounding system of the electrical device and the distance between the ground net or other ground net. through 50 m or higher, grounding resistance Ω 1 or less, or conform to the manufacturer standard.

4 cable shielding layer should be grounded in the control room to the instrument equipment grounding bus bar, signal shielding layer should keep continuous in the whole cable connection.

5 grounding line adopts multiple strands of copper conductor, by using pressure welding connection.

6 ground wire insulating sheath color appropriate for yellow and green colors, both ends should be sign indicates that grounding type.

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