The following table describes the attributes used by the Heat Exchanger with Return Water Control modules:
|
Name |
Type 1 |
Description |
Default Value |
|---|---|---|---|
|
Compensator Cmd |
Controls the heat exchanger valve. The valve is commanded from 0% to 100%. This output incorporates the Lead Compensator. |
0.0 Display Units: % |
|
|
Control Status |
V |
Provides the PID status with possible values of Normal, Overridden, Disabled, Low, Timing Low, High, and Timing High. |
Normal Set Name: Control Status |
|
Low Limit Process Variable |
Provides the low limit temperature process variable. |
38 °C, 100 °F |
|
|
Low Limit Proportional Band |
Provides the range across which the valve is proportionally modulated open as the Low Limit Process Variable drops below the Low Limit Setpoint. |
5 °C, 9 °F |
|
|
Low Limit Setpoint |
Provides the upper threshold for the low limit temperature, below which the heating supply water valve is proportionally modulated open during normal control modes. |
38 °C, 100 °F |
|
|
Mode |
Indicates the mode of operation for the module. |
Off Set Name: Off/Max/Control |
|
|
Output Overridden |
Indicates when the actual output controlled by this output is overridden by a user. |
False |
|
|
Output Position |
Provides the current Present Value of the output that this controller drives. |
0% |
|
|
PID Tuning Reset |
Causes the PID objects to reset their tuning parameters to the default based on the appropriate Process ID. |
Normal Set Name: PID Tuning Reset |
|
|
Percent Cmd |
V |
Controls the heating supply water valve. |
0.0% |
|
Percent Request |
V |
Contains the output requested by the control before being limited based on the Low Limit Process Variable. This attribute provides bumpless transfer between state sections. |
0.0% |
|
Process ID |
Indicates the type of heating process being controlled by the device when the mode is Control. |
ZN-T Set Name: Process ID |
|
|
Process Units |
Specifies the units for the heating PID. For this particular module, the only two valid values are °C and °F. |
°C, °F Set Name: Unit |
|
|
Process Variable |
Provides the control temperature. |
0.0 |
|
|
Setpoint |
Provides the control temperature setpoint. |
0.0 |
|
|
State |
G |
Provides the operating state output as determined by the Mode input. |
Off Set Name: Off/Max/Control |