The Humidification Proportional Steam Output module controls a proportional steam humidification device. The module includes an Isolation Valve Command and On Delay input to configure the time that the Isolation Valve is on before the proportional output is allowed to open. The humidity control may be configured for either RA-H or ZN-H. In addition, the module has a humidity high limit control to prevent the duct humidity from rising above a duct high humidity setpoint. The module accepts inputs from the control relative humidity and setpoint and the high limit humidity and setpoint. This module also incorporates tracking the overridden value of the actual output object (AO, PAO). The module resets the PIDs to default tuning parameters if the Reset PID Tuning input is not Normal.
This module provides a second output that incorporates lead compensation to control devices. This function attempts to remove some of the dynamics of the control loop. This process results in forward-looking predictions and speeds up controller responses. The effect is similar to adding derivative action to the controller. Lead compensation is incorporated into most zone temperature control processes where oversized or nonlinear valves might be applied. For more information on the Lead Compensator block, see Lead Compensator in the Control category of the Logic section.
You can view and modify the modules in this group’s logic.