Exploration on Forcing the CS3000 IOP Alarm System to Manual Mode
Thread Content
I assume that when using and maintaining the CS3000, everyone will more or less encounter IOP alarms. As you all know, once an IOP alarm occurs, the system forces the mode from AUT to MAN. Of course, it is also possible to manually set an IOP alarm; in that case, the circuit still operates in AUT mode. I’m not quite sure which of these two setting methods is better and what the advantages of each are. I would appreciate it if you could share your insights.
Of course, it’s manual safety~~~~~~~~~
Manual operation is safe, but you have to control everything by hand, which is annoying and tiring. Automatic mode is more convenient; as long as there are no problems, you can just sit there, daydream, or use your phone. Errors such as “IOP” input circuit failures can occur, or the measurement values may be outside the instrument’s range, or there might be hardware issues with the instrument or problems with the wiring. It’s sufficient to have the instrument maintenance staff handle those issues. I think automatic mode is better.
If all the programs are made as mentioned upstairs, then what’s the need for operators?
1. In the DCS Yokogawa CS3000, IOPs are divided into two types: IOP- and IOP+. The former applies when the measured value is below the lower measurement limit, while the latter applies when the measured value is above the upper measurement limit； In the case of a single-loop short circuit, it is also IOI; at this time, the value before IOP remains unchanged ； 2. When IOP is used, the regulator should be manual to ensure that operators pay attention to the operations; this applies to extreme situations where DV is very high. If automatic mode is used, the control loop will experience significant oscillations, leading to chaotic operating conditions. Automatic mode can only be activated once PV values return to normal ； So it’s better to use manual mode during IOP! ! !
If an IOP input circuit failure occurs, the PV value becomes unreliable; if the regulator remains in automatic mode, it will keep adjusting the MV. The consequence...