Dynalco AF-900PC Air/Fuel Ratio Controller - Manual (Page 34)

33
Sensor Fault Select: Determines what control action will be taken if the pre-cat O
2
sensor has a fault. Options are chosen from a drop down menu and are as follows:
Opposite:
Sets the fuel valve opening the same as the opposite bank.
Fault: Sets the fuel valve opening to the value configured in the “fault percent
(%)” parameter.
MAP:
Sets the fuel valve opening from the learn table based on current
manifold air pressure reading.
Start Temp (F): Controller changes from SENSOR WARM UP mode to AUTO
mode when exhaust temperature exceeds this threshold.
Off (Exhst Low) Temp (F): Controller returns to SENSOR WARM UP mode when
the exhaust temperature on either bank drops below this threshold. This parameter
is also used for “Exhaust TC Temp Low” trip.
Prop Gain: The pre-catalyst proportional gain parameter determines the gain of
the PI control loop. The larger the gain, the more aggressive the output changes in
response to errors. A typical of 0.020 is a good place to start.
Reset Time: The pre-catalyst reset time parameter determines the integration rate
of the PI control loop. The smaller the reset time parameter the faster the control
loop will integrate and increase or decrease the output while there is error. A typical
value of 5.0 is a good starting point.
Fast Dynamics: This button enables or disables the fast dynamic control function.
Fast dynamics are used to boost the proportional gain when a large error occurs.
Gain @ Fast +: Sets the proportional gain multiplier when in fast dynamics with a
Pre-Cat O
2
sensor reading greater than the “O
2
Setpoint Comp (V)”. A starting
value of 3.0 is suggested.
Gain @ Fast -: Sets the proportional gain multiplier when in fast dynamics with a
Pre-Cat O
2
sensor reading less than the “O
2
Setpoint Comp (V)”. A starting value of
3.0 is suggested.
Error for Slow: Sets the error voltage at which the PI loop will return to slow
dynamics. A starting value of 0.025 is suggested.
Error for Fast: Sets the error voltage at which the PI loop will go into fast
dynamics. A starting value of 0.050 is suggested.