What do these graphic symbols in the PID diagram represent?
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What do the graphic symbols JI/YA/YL/HS/SB in the red circle on the PID diagram represent?
The meaning of unconventional instruments and combined symbols must be understood by examining the process control requirements specified in the drawings, in conjunction with the diagrams on the first page; each project and design entity has its own unique characteristics
Refer to HG/T 20505-2014 for the functional indicators and graphic symbols of process measurement and control instruments
I just downloaded it and checked, but I couldn’t find it. These are the control and operation signals for electricity.
The instrument displays control or interlock signals; take a look at the legend
No, it’s the operating status of the electrical system and the control signals; it’s not clear what exactly is meant
You can take a look at the homepage image of your PID. It contains explanations of the gauge symbols. Or ask the person in charge of the instruments. But looking at your picture, I can tell where it comes from. Germans have their own habits*. Generally, YA refers to the operating status, YL indicates an operating fault, HS is the manual switch, and SB is the switch button
It seems to be a signal related to the operation of the motor or something similar; HS is likely a selector switch, while Y should represent the operating status. To be sure, one would need to check the legend