EMC plays an increasingly important part in the design of electronic products and systems. Your task is to discuss the techniques and ‘good practice’ used in the design of various parts of a complex electronic product (system) to increase the chances of the final system becoming compliant to the EMC directive. How would you ensure that the system was designed and installed to ensure electromagnetic compatibility?
If after this recommended design process the system failed to meet the EMC standard/s you had chosen, what other techniques would you recommend to correct any system problems?
A control room in a manufacturing factory has to be protected from the risk of any power supply failure or data loss from any transient attack (whether deliberate or not).
The environment is essentially very noisy from an electrical point of view, with a wide variety of electrically powered AC machines, some using significant current to meet their operational needs. There are also sensitive sensors and transducers at various locations around the plant, some are ‘hard wired’ and others connected to the control room via wireless links (maximum range 100 metres).
There are also low definition cameras’ placed at strategic locations around the automatic production lines, along with other safety systems that engage and disconnect power/stop the process if personnel enter certain areas or production lines become jammed.
The assignment should concentrate on the following system elements and could be broken into four distinct areas, each focussed on the EMC issues likely to be present-
1. Sub system
Safety critical systems.
2. Sub system
The control and data connectivity issues.
3. Sub system
The power and UPS system.
4. System design issues
Recognition of good EMC design and strategies to combat any unforeseen EMC problems,
Criteria for assessment (Marking break down)
1 Application of good EMC design rules for the system (25%)
2 Evidence of system analysis and interpretation of potential EMC issues. (25%)
3 Evaluation of potential solutions to system EMC related
4 Use of EDRA to evaluate technical recommendations, clearly expressed in the report as a conclusion. (25%)
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