Operating Instructions

Applications
Siemens Building Technologies, Inc. 23
Airflow Control
The PID loop controls the damper based on the values of the exhaust flow and the flow
setpoint. The loop output controls the supply and exhaust through a time modulation scheme.
The control loopout ranges from -100 to 100%.
 -100% is the maximum supply that closes the damper at full speed.
 0% holds the damper at its current position.
 100% is the maximum exhaust that opens the damper at full speed.
Electronic
The controller sends a separate signal to each of the two inputs that reside on the AO-E
module. For values of 100% to 0%, the controller sends a decreasing percentage of the full
signal length to the retract input. For values of 0% to -100%, the controller sends an
increasing percentage of the full signal to the extend input.
Pneumatic
The controller sends a separate signal to each of the two solenoids that reside on the AO–P
module. For values of 100% to 0%, the controller sends a decreasing percentage of the full
signal length to the exhaust solenoid. For values of 0% to -100%, the controller sends an
increasing percentage of the full signal length to the supply solenoid.