sealyons
Member
Obviously, it makes most sense to place PLCs into cabinets with little to no high voltage AC (230V & 460V) signals present to help reduce possible noise issues. However, we have an application where a customer really wants PLCs placed into these cabinets and I'm trying to determine how to proceed. Has anyone had specific problems mixing high voltage AC with 24VDC PLCs and associated I/O signals? To what level would you push-back on the customer to keep them from mixing these signals?
When placing a PLC (small Omron PLC, self-contained, 14 I/O) in a 230V or 460V panel (with transformers), what is the best mounting approach? I've heard that a 200mm (approx. 8 in) space should be left free of high voltage wires all around the mounted PLC. Does this make sense? Are there any other guidelines that should be followed? We will minimize 24VDC lines from running in ducts with high voltage lines and keep wire crosses at 90 degrees wherever possible.
Appreciate any comments.
When placing a PLC (small Omron PLC, self-contained, 14 I/O) in a 230V or 460V panel (with transformers), what is the best mounting approach? I've heard that a 200mm (approx. 8 in) space should be left free of high voltage wires all around the mounted PLC. Does this make sense? Are there any other guidelines that should be followed? We will minimize 24VDC lines from running in ducts with high voltage lines and keep wire crosses at 90 degrees wherever possible.
Appreciate any comments.