Regarding the allowable start signal for the motor
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The instrument is used to control the motor signals; some of them have a signal allowing startup, while others do not. Why is that? I am a process control operator; I need help.
Whether motor control requires an instrument-generated start signal mainly depends on the requirements of the production line’s manufacturing process.
The design is primarily based on the importance and relevance of the motor-driven equipment within the system; if it is a critical piece of equipment, process and instrument control systems must issue an electrical start signal to prevent accidental operation or mistakes. Start-up must be carried out in accordance with the relevant approval documents
You didn’t explain it very clearly. In one case, when it comes to a particularly important motor that is related to the safety system SIS, the SIS will generate a permit signal that is sent to the motor’s secondary control circuit. For the DCS to start the motor, it is necessary for this permit signal to be closed first. I’m not sure if I answered your question
It is mainly based on the importance of the motor-driven equipment in the system