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Function Blocks
CARB Carbon Potential Function Block
Revision 11
HC900 Hybrid Control Designer Function Block Reference Guide
97
2/07
CARB Carbon Potential Function Block
Description
The
CARB
label stands for
Carbon Potential.
..
This block is part of the
Loops
category
Function
A combined Carbon Probe and Temperature Probe and PID algorithm determine Carbon Potential of
furnace atmospheres based on a Zirconia probe input.
Input
Probe =
Sensor Input from AI block (0-2000 mV)
TEMP
= Temperature Input (°F or °C) from AI block
%CO
= Percent Carbon Monoxide 1 % to 100 %
RSP
= Remote Setpoint Analog Input value in Engineering Units or Percentage (0-1.5)
FFV
= Feedforward value in percentage (0 % to 100 %) The Feedforward value is multiplied by the
Feedforward Gain, then directly summed into the output of the PID block.
TRV
= Output Track value in Percentage. Output = TRV when TRC is on. (If control output OUT is
connected back to the Track Value Input [TRV], then the Track Command Input [TRC] will function as an
output hold. This may be used where input probes are undergoing burnoff.)
TRC
= Output Track Command [ON, OFF] On – Enables TRV (Mode = Local Override)
BIAS
= Remote Bias value for Ratio PID
SWI
= Switch Inputs (from LPSW function block)
0 = No Change
1 = Initiate Autotuning
2 = Change Control Action (reverse to direct acting or direct to reverse acting)
4 = Force Bumpless Transfer
8 = Switch to Tune Set 1
16 = Switch to Tune Set 2
Содержание HC900
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