Issues regarding the unit interlock testing of vibration, displacement, and rotational speed
Thread Content
I would like to ask everyone: in a unit control system composed of Triconex and PLCs, testing the interlocks of the unit to ensure their integrity is an essential step before starting up the unit. So I would like to know how you test signals such as vibration, displacement, and rotational speed in a static state? Is it sufficient to calibrate the probe alone, or is it also necessary to conduct interlock testing for the entire circuit? Thank you~!
It is recommended to read the relevant product instructions, as the answers can be found there.
We are to test the entire circuit by sending simulated signals on-site, in order to check the accuracy and response time of the interlock actions and ensure that the circuit is functioning properly. It is determined whether the connection box to the probe section is functioning properly by checking typical parameters.
This is a safety protection system; when conducting simulation experiments, it is essential to replicate the entire process accurately. Only when an entire circuit is intact can it be considered functional, and no node should be overlooked. Signal generators are used on-site to simulate signals. I’m not sure what kind of signal is used for vibration detection in your case; I used frequency signals in the past. For the displacement measurement, you should start by measuring the component from one side. It’s advisable to adjust the position of the displacement sensor before closing the front cover. Some units consider the rotor positioned at the front end of the machine to be the zero point, while others use the rotor positioned at the rear end as the zero point. The latter approach is more commonly used, depending on the requirements specified by the turbine manufacturer. Once this is set, insert a feeler gauge to measure positive displacement, while negative displacement is achieved by pushing the rotor towards the front end of the machine. This is the most accurate way to conduct simulations； As for the rotation speed, you can only generate fake signals using a signal generator – at least 4 different rotation speeds, sometimes even more; each of these speeds is simulated. Once it has been confirmed that every device and circuit is functioning properly, interlock actions can then be implemented through forced mechanisms within the program, in order to verify whether the logic is correct