Power consumption issues of PLCs
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We have eight compressors here, which are controlled by eight PLC units. Each of these PLC units is of the S7-300 model, equipped with 1 input module, 5 output modules, and 26 safety relays. There are also 8 5A intermediate relays. The total current capacity of the circuit breakers is currently 40A. I was wondering whether this capacity is a bit too low.
You can ask the PLC manufacturer, or you can also calculate it based on power
Go to Siemens’ service website and look for the PDF files related to the cards, which contain information on the maximum power and current. Do it by yourself; working with your hands can teach you a lot
If the PLC is only responsible for powering the transmitters, 40A should be sufficient.
It’s completely fine. If the circuit breaker is used solely to supply power to control circuits such as PLCs and relay coils, then there’s definitely no problem as long as it doesn’t trip during operation
No problem. Your compressor is very small. There are very few instruments
If it’s only the PLC and control components that consume power, it shouldn’t require that much, right?