Analog Grounding Consideration

Overview

For the Analog Input Modules, the earthing must be done by the analog wires. Analog wires must be grounded directly when entering the cabinet. You may use an analog cable grounding rail. This section describes this approach.

Principle

High frequency interference can only be discharged via large surfaces and short cable lengths.

Guidelines

Follow these wiring guidelines:

Use shielded, twisted-pair cabling.
Expose 2.5 cm (1 inch) as shown:.
Make sure the wire is properly grounded (connection between the grounding bar and the clamps).

NOTE: It is strongly recommended to use the STB XSP 3000 grounding kit and, either the STB XSP 3010 or the STB XSP 3020 clamp kits.

Assembly of the STB XSP 3000 Kit

The followed kit is used to have a high quality of the analog signal.

The following table describes the STB XSP 3000 grounding kit.

Elements	Description
Side Supports and grounding bar	The following illustration describes the assembly of the side supports and the grounding bar.

The following table describes the step to assemble the STB XSP 3000 grounding kit:

Step	Description
1	Push the side supports against the walls and tighten the screws.
2	Choose the length of the grounding bar.
3	Insert the functional grounding terminal block and tighten the screw
4	Fix the grounding bar at the side supports.
5	The following figure describes the final assembly of the STB XSP 3000.

STB XSP 3010 Kit and STB XSP 3020

The following table describes the different cable sections (in AWG and mm2):

Reference	AWG	mm2
STB XSP 3010	16 to 9	1.5 to 6.5
STB XSP 3020	10 to 7	5 to 11

Final Assembly

The following figure shows the final assembly: