I have cascade control loop consists of 3 parameters
1-Boiler level
2-steam flow
3-water flow to compensate the decrease of the level in the boiler
The first loop is auto for the level of the boiler
The other loop is the water flow to compensate the decrease of the level
In cascade mode it take its set point from the steam flow+ the op of the control valve of the level
The main issue when converting the pid of the water flow to cascade some time it responds for 2-3 hours and then not responding
If we converted the loop to manual mode and give it op manual then convert again to cascade it will keep the same op
Then we observed to alarm at the pid from the network wind up status
And output wind up status was giving hi and lo
After decreasing the gain the windup became normal but the main issue still not solved
1-Boiler level
2-steam flow
3-water flow to compensate the decrease of the level in the boiler
The first loop is auto for the level of the boiler
The other loop is the water flow to compensate the decrease of the level
In cascade mode it take its set point from the steam flow+ the op of the control valve of the level
The main issue when converting the pid of the water flow to cascade some time it responds for 2-3 hours and then not responding
If we converted the loop to manual mode and give it op manual then convert again to cascade it will keep the same op
Then we observed to alarm at the pid from the network wind up status
And output wind up status was giving hi and lo
After decreasing the gain the windup became normal but the main issue still not solved