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Hello all,
I am using a Micrologix 1400 in a plastic extrusion process. The issue I am seeing is that when I disable and then enable the heating/cooling for the barrel zones after a period of downtime the PID takes off from the last values it was running at. But when we are trying to heat up a cool barrel the output for the cooling portion continues to operate even though we need straight heating to get to temp. It takes a long time for that value to drop out on its own. I need an assist on the logic I would have to add that could be triggered by a bit coming from the HMI allowing the operator to manually reset the control output (CV).
Thanks.
I am using a Micrologix 1400 in a plastic extrusion process. The issue I am seeing is that when I disable and then enable the heating/cooling for the barrel zones after a period of downtime the PID takes off from the last values it was running at. But when we are trying to heat up a cool barrel the output for the cooling portion continues to operate even though we need straight heating to get to temp. It takes a long time for that value to drop out on its own. I need an assist on the logic I would have to add that could be triggered by a bit coming from the HMI allowing the operator to manually reset the control output (CV).
Thanks.
