What should be noted during the installation and maintenance of signal isolators for gate opening?
Due to different manufacturers, the production process and wiring definitions for isolators are also different, but the usage scenarios are basically the same, so the protection requirements and maintenance for the products are basically the same.
1. Before use, carefully read the instruction manual.
When used for signal isolation, the input terminal should be connected in series to the loop circuit, and the output terminal should be connected to the sampling circuit.
When used as an isolated distribution system, the input terminal should be integrated into the power circuit, and the output terminal should be connected to a transmitter.
If it does not work properly, first check whether the wiring is correct, pay attention to whether the power supply is correct and the polarity is reversed.
Why do PLCs sometimes receive on-site signals with large errors and poor stability?
There are many reasons for this phenomenon, and the potential difference between different instrument signal reference points is an important factor. Due to this' difference ', interference currents are generated between instrument signals, resulting in large PLC errors and poor stability. So the signals from different devices and instruments have a common reference point of * condition. Isolators electrically isolate the input/output, forming a common reference point on the PLC analog interface board, and solve the problem when the ideal condition is reached.
What should I do if I isolate the 4-20mA channel and there is no space for power supply in the cabinet?
A passive typesignal isolatorIt can achieve 4-20mA signal isolation without the need for external power supply. PH1033 is such a product. There are so many brands of isolators in the market now, with varying prices. How should I choose? The isolator is located between two system channels, so when selecting an isolator, the first step is to determine the input and output functions, while also adapting the isolator's input and output modes (voltage type, current type, loop power type, etc.) to the interface modes of the front and rear channels. In addition, there are many important parameters related to product performance, such as accuracy, power consumption, noise, insulation strength, and bus communication function. For example, noise is related to accuracy, power consumption and heat are related to reliability, which require users to carefully choose. In short, applicability, reliability, and cost-effectiveness are the main principles for choosing isolators.
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