PID control parameters in Yokogawa CS3000
Thread Content
In the PID control parameters of the Yokogawa CS3000, the parameters related to MV are as follows: OPHI indicates the upper limit of MV, OPLO indicates the lower limit of MV, MSH represents the upper range limit of MV, MSL represents the lower range limit of MV, MH is the setting for the upper limit of MV, and ML is the setting for the lower limit of MV. How should these be understood?
OPHI OP high limit indication – output signal high limit; OPLO OP low limit indication – output signal low limit
The upper limit of the MSH MV range and the lower limit of the MSL MV range serve to define the output MV. For example, if MSH is set to 80% and MSL to 20%, manual output of MV can only produce values between 20% and 80%; values below 20% or above 80% cannot be outputted. It is mainly used for full-on and full-off protection.
Also, what does the alarm on the CS3000 VEL+ mean?
VEL+ is an alarm for a positive deviation in process data rate
This is done for safety reasons; certain valves or control parameters are used to regulate parameters such as liquid level or pressure. By alerting the operator in advance when these parameters decrease or increase, it serves as a warning system. Some valves cannot be closed completely; they need to remain at a certain degree of opening, and setting this parameter ensures that the process requirements are met.
That makes a lot of sense; it really does. Please give me your guidance