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Electromagnetic Compatibility

6.2.2EMC Guidelines

The guidelines for installation and wiring are detailed in the Operating Instructions, but the key points are as follows:

1.Ensure all equipment in the cubicle is well earthed, using thick, short earthing cable. Earth control equipment in the same way to the same earth point. Star point grounding, shown in Figure 6-2, is ideal, but a solid busbar is acceptable provided it is well grounded.

Monitor

 

 

PLC

 

 

Inverter

 

 

 

 

 

 

 

 

System

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thick, short, grounding cable connected to common ground point

Figure 6-2 Star Point Grounding

2.Use screened leads for connections to the control circuitry. Ground the screen at both ends.

PLC

Inverter

Figure 6-3 Screening of Control Cables

3.Separate the control cables from the power connections (e.g. supply and motor connections) as much as possible, using separate trunking etc.

Input (Supply) Connections

MM

 

 

MM

Control Connections

Output (Motor) Connections

Figure 6-4 Separation of Control and Power Connections

MICROMASTER Applications Handbook

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