During the major maintenance of the unit, a high furnace pressure interlock was installed at -5 kPa. However, the pressure in our furnace fluctuates greatly; it might become positive pressure as soon as the viewing window is opened!
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Moreover, the interlock is connected to the constant-light device as well; as an operator, one still doesn’t feel confident, because it’s not possible to turn on so many burners in such a short time!
I would like to ask whether it is possible to eliminate such instantaneous fluctuations in DCS, thereby reducing the likelihood of interlocks occurring
It was written incorrectly as -5pa. Upon closer inspection, the interlock condition requires it to last for 10 seconds
Increase the frequency conversion of the exhaust fan to keep the negative pressure in the furnace away from the interlock value