Siemens A1 User Manual
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Electromagnetic Compatibility
MICROMASTER Applications Handbook
31
6.2.2 EMC
Guidelines
The guidelines for installation and wiring are detailed in the Operating Instructions,
but the key points are as follows:
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.
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
System
System
PLC
Inverter
Thick, short, grounding cable
connected to common ground point
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.
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.
connections) as much as possible, using separate trunking etc.
MM
MM
Input (Supply) Connections
Output (Motor) Connections
Control Connections
Figure 6-4
Separation of Control and Power Connections