TRICONEX 4351B

Brand: TRICONEX

Type:4351B

Origin: the United States

Warranty: 365 days

Colour: new/used

Shipping method: Courier delivery

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A controller configured as feedback dominant is more sensitive to the change-ofrate of its feedback (LSS in the case of Speed and Aux). A feedback dominant controller has the ability to limit the rate of change of the LSS bus when a controller is near its setpoint but is not yet in control. This limiting of the LSS bus allows a feedback dominant controller to make smoother control transitions than an input dominant controller. Tuning Example If the system is unstable, verify if the governor is the cause. This can be checked by moving the valve limiter until it has control of the actuator output. If the system continues to oscillate when the valve limiter is in control of the valve, the system instability is caused by an external device/function. If the governor is causing the oscillation, time the oscillation cycle time. A rule-of-thumb is, if the system’s oscillation cycle time is less than 1 second reduce the Proportional gain term. A rule-of-thumb is, if the system’s oscillation cycle time is greater than 1 second reduce the Integral gain term (proportional gain may need to be increased also). On an initial startup with the 505E, all PID dynamic gain terms will require adjustment to match the respective PID’s response to that of its control loop. There are multiple dynamic tuning methods available that can be used with the 505E’s PIDs to assist in determining the gain terms that provide optimum control loop response times (Ziegler Nichols, etc.). 

The following method is a simplified version of other tuning methods, and can be used to achieve PID gain values that are close to optimum:1. Increase Derivative Ratio (DR) to 100 (This is the default setting). 2. Reduce integral gain to minimum. 3. Increase proportional gain until system just starts to oscillate. 4. Record the system gain (G) and oscillation period (T). 5. Set the dynamics as follows: ? For PID control set the proportional gain=0.60*G; integral gain=20/T; SDR=5 ? For PI control set the proportional gain=0.45*G; integral gain=12/T; SDR=100 This method of tuning will get the gain settings close, they can be fine-tuned from this point. Figure 5-19 shows the typical response to a load change when the dynamics are optimally adjusted.