ABB AWT420, Operating Instruction

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AW T4 20 |
U N I V ER S A L 4 - W I R E , D UA L- I N P U T T R A N SM I T T ER | O I/AW T4 2 0 - EN R E V. B 45
Control
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.
Menu
Comment Default
PID 1 (2)
Control Action
Off, Reverse-acting, Direct-Acting, Dual-acting. Off
Control Mode Auto, Manual Auto
Reverse Control
Direct Control If Control Action = Reverse or Direct-Acting :
Setpoint Numeric value, limited to PV Range. PV range low
Control Type P, P+I, P+I+D, P+D. P
Proportional Band Numeric value: 0.1 to 999.9 %. 100 %
Integral Action Time
If
Control Type
=
P+I
or
P+I+D
:
• Numeric value: 1 to 7200 s.
1 sec
Derivative
Action Time
If
Control Type
=
P+I+D
or
P+D
:
• Numeric value: 0.1 to 999.9 s.
999.9 sec
Manual Reset
If Control Type = P or P+D :
• Numeric value: 0.0 to 100.0 %
0.0 %
Output Type
Analog, Time Proportioning, Pulse Frequency. Analog
Cycle Time If Output Type = Time Proportioning :
• Numeric value: 1.0 to 300.0 s.
10 sec
Pulse Frequency If Output Type = Pulse Frequency :
• Numeric value: 1 to 120 pulses per minute
60 pulses/min
Acid Controller Acid = Dual-acting.
Setpoint (SPA) Numeric value: SPB + 0.5 to 16.0. PV range high
Control Type
P, P+I. P
Proportional Band Numeric value: 0.1 to 999.9 %. 100 %
Integral Action Time
Enabled if
Control Type
=
P+I
:
• Numeric value: 1 to 7200 s.
1 sec
Output Type
Analog, Time Proportioning, Pulse Frequency. Analog
Cycle Time If Output Type = Time Proportioning :
• Numeric value: 1.0 to 300.0 s.
10 sec
Pulse Frequency If Output Type = Pulse Frequency :
• Numeric value: 1 to 120 pulses per minute
60 pulses/min
Control
Exit
Menu
Select