ABB AWT420 - Control action

AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
105
Operator menus
The following menu options available from the Operator page/
Start menu enable selection of the Control Mode and
adjustment of Setpoints or Output:
Figure 37 PID control: Control Mode/Setpoint/Output menus
Control action
Reverse-acting control
• Single control output
• 
• Output increases as Process Value deviates below Setpoint
• Output is zero if Process Value is greater than Setpoint
• Proportional band is positioned below Setpoint
only if Control Mode/Manual Figure 37.
Figure 38 Reverse-acting control
Direct-acting control
• Single control output
• 
• Output increases as Process Value deviates above Setpoint
• Output is zero if Process Value is less than Setpoint
• Proportional band is positioned above Setpoint
only if Control Mode/Manual Figure 37.
Figure 39 Direct-acting control
In Configuration
CAL
Use the / keys to
toggle/select SPA* or
Output mode.
Output mode enabled only
if Control Mode/Manual is
selected.

Use the / keys to
toggle/select SPA*, SPB** or
Output mode.
Output mode enabled only
if Control Mode/Manual is
selected.


Use the / keys to
toggle/select Auto or
Manual mode.
Control Mode
Setpoint/Output adjustment –
direct or reverse-acting controller (1 setpoint)
Setpoint/Output adjustment –
dual-acting controller 92 setpoints)
Control Mode
Adjust
Operator Views
Data Logs
Logs
Manual Hold
Au toscroll
Enter Conguration
Auto
Manual
SPA
Output
SPA
SPB
Output
Control Mode
Adjust
Operator Views
Data Logs
Logs
Manual Hold
Au toscroll
Enter Conguration
Control Mode
Adjust
Operator Views
Data Logs
Logs
Manual Hold
Au toscroll
Enter Conguration
Operator menus
Operator menu
access key
Autoscroll
Manual Hold
Enter Conguration
100 %
Output
Proportional
band
Setpoint
0 %
PV
100 %
Output
Proportional
band
Setpoint
0 %
PV