The Cooling Proportional Valve Output Module controls a proportional valve for either cooling or dehumidification. The module can be configured for DA-T, RA-T, or ZA-T control and it may be configured for RA-H or ZN-H control. The module has been designed with temperature control, dehumidification, and several different protection modes. This module also can control a circulating pump. 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.