Control - ABB AWT420 Operating Instruction

AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B

Control

Menu
Control
Exit Select
Menu Comment
PID 1 (2)
Control Action
Off, Reverse-acting, Direct-Acting, Dual-acting.
Control Mode Auto, Manual
Reverse Control If Control Action = Reverse or Direct-Acting:
Direct Control
Setpoint Numeric value, limited to PV Range.
Control Type
P, P+I, P+I+D, P+D.
Proportional Band Numeric value: 0.1 to 999.9 %.
Integral Action Time If Control Type = P+I or P+I+D:
• Numeric value: 1 to 7200 s.
Derivative If Control Type = P+I+D or P+D:
Action Time • Numeric value: 0.1 to 999.9 s.
Manual Reset If Control Type = P or P+D:
• Numeric value: 0.0 to 100.0 %
Output Type
Analog, Time Proportioning, Pulse Frequency.
Cycle Time If Output Type = Time Proportioning:
• Numeric value: 1.0 to 300.0 s.
Pulse Frequency If Output Type = Pulse Frequency:
• Numeric value: 1 to 120 pulses per minute
Acid Controller Acid = Dual-acting.
Setpoint (SPA) Numeric value: SPB + 0.5 to 16.0.
Control Type
P, P+I.
Proportional Band Numeric value: 0.1 to 999.9 %.
Integral Action Time Enabled if Control Type = P+I:
• Numeric value: 1 to 7200 s.
Output Type Analog, Time Proportioning, Pulse Frequency.
Cycle Time If Output Type = Time Proportioning:
• Numeric value: 1.0 to 300.0 s.
Pulse Frequency If Output Type = Pulse Frequency:
• Numeric value: 1 to 120 pulses per minute
PID control functionality is available for both channels of the AWT420 transmitter. Conductivity
channels are configurable for reverse or direct-acting control. pH channels are configurable for
reverse-acting, direct-acting or dual (Acid/Base) control.
Control outputs are configurable for Analog, Time Proportioning or Pulse Frequency output.
Analog control outputs can be assigned to any of the available analog outputs. Time
proportioning control outputs can be assigned to any of the available relays or digital outputs
and pulse frequency control outputs can be assigned to any of the available relays or digital
outputs.
45
Default
Off
Auto
PV range low
P
100 %
1 sec
999.9 sec
0.0 %
Analog
10 sec
60 pulses/min
PV range high
P
100 %
1 sec
Analog
10 sec
60 pulses/min