The following table describes the attributes used by the Exhaust Damper Control module.
|
Name |
Type 1 |
Description |
Default Value |
|---|---|---|---|
|
Box Flow Test Position |
V |
Indicates the desired damper position when the mode is set to box flow test. |
0.0 Display Units: % |
|
Control Status |
V |
Current saturation status of the controller.
|
Overridden Set Name: Control Status |
|
Diff Setpoint |
Calculates the Exhaust Flow Setpoint using the Supply Flow. |
0 l/s, 0 cfm |
|
|
Exhaust Damper Absolute EWMA Effort |
Provides an EWMA based on the absolute value of (Current Present Value - Last Present Value). The PID computes this value. |
0.0 Display Units: % |
|
|
Exhaust Damper Absolute EWMA Error |
Provides an EWMA based on the absolute value of (Flow Setpoint - Process Variable). The PID computes this value. |
0.0 Display Units: l/s, cfm |
|
|
Exhaust Damper EWMA Error |
Provides an EWMA based on the difference of (Flow Setpoint - Process Variable). The PID computes this value. |
0.0 Display Units: l/s, cfm |
|
|
Exhaust Damper EWMA Present Value |
Provides an EWMA based on the difference of (Present Value - Last Present Value). The PID computes this value. |
0.0 Display Units: % |
|
|
Exhaust Flow |
Specifies that when the mode is set to Control, this is the flow that is to be controlled and must therefore respond to changes in the output. |
0 l/s, 0 cfm |
|
|
Exhaust Rated Flow |
Rated flow of the exhaust box. This is not a limit to the flow when in control mode. |
500 l/s, 1000 cfm |
|
|
Exhaust Stroke Time |
Contains the time (in seconds) that it takes the actuator to move from 0% to 100% or from 100% to 0%. Should these values be different, the average is used. |
60 Seconds |
|
|
Failsoft Value |
V |
Indicates the desired damper position when in failsoft mode. |
0.0 Display Units: % |
|
Minimum Pulse Width |
V |
Contains the minimum pulse width used by the PVDC block. |
Display Units: Seconds |
|
Mode |
Contains the mode requested by State Selection.
|
Close Set Name: VAV Flow Control Mode |
|
|
PD Max Position |
Maximum position under unreliable control. Under unreliable flow conditions, flow setpoints are linearly converted into a damper position between this value and 0%. |
80.0% |
|
|
Percent Cmd |
V |
Contains the analog percent output on a scale of 0% to 100%. This value is typically connected to either a PAO or an AO. |
Display Units: % |
|
State |
G, V |
Current operational state of the output controller. |
Set Name: VAV Exhaust Flow Ctrl State |
|
Supply Flow |
Specifies that when the mode is set to Control, this attribute provides the second flow for calculating the flow difference. |
0 l/s, 0 cfm |