Question about surge protectors
Thread Content
May I ask whether the surge protector should be installed at the field equipment or on the terminals of the control cabinet? There are AI and AO signals available
What I’ve seen is all on field equipment, but since some of that equipment can withstand high pressure, there are indeed people who don’t use it.
If it is for lightning protection, it needs to be installed at both ends.
If necessary, a surge protector should be installed in front of the system card that connects to the AI/AO signals; it is usually mounted on a rail and serves to protect the system card. For field equipment that is of high value, surge protectors are also necessary; they are usually installed using stainless-steel threads and screwed onto the electrical interfaces of the instruments. Additionally, the power supply system also requires surge protectors to be installed; a three-stage power surge protector needs to be placed inside the PLC control cabinet.