HONEYWELL 05704-A-0145 Digital channel module

The following procedure may be used as a starting point to finding the optimal dynamic settings: 

1. Adjust Controller Integral Gain to a minimum value. 

2. Increase Controller Proportional Gain until the actuator just starts to oscillate. Record the Period of the oscillation (Posc) and Controller Proportional Gain (Kosc). 

3. Set Controller Proportional Gain 0.45 * Kosc and Controller Integral Gain 1.2/Posc. This gives stable response. Test the actuator response and further refine the tuning until the desired performance is obtained.

An SPC adjusted to an under-damped condition 

will be more responsive with less gain margin. It is more susceptible to instability due to changes in the system. An SPC adjusted to an over-damped condition will have slower response and better stability. It is less susceptible to instability due to changes in the system. The ideal adjustment is a critically damped condition. This produces the best stability and response combination. Ref. Manual 83402 PID Control for additional information on tuning the control.

PI w/Lag

The PI w/Lag controller is a PI controller with a lag block conditioning the demand signal. The lag term may he used to cancel, or partially cancel, a zero in the closed-loop transfer function. Tuning of this control is exactly the same as the PI control. Use this control if you have a critical process which cannot tolerate overshoots. This control will limit actuator response although the lag can be set to a low value to avoid excessive delay. Forward/Reverse Acting Control Selects the sense of the error signal in the controller. For example, when the demanded position exceeds the actual position (positive error), a forward-acting controller drives the output more positive, while a reverse- acting controller drives the output more negative.

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