The calculations forthePID valuesarethe sameasusedin thestandardZiegler - Nichols equations that have been recognized as standard for decades.
The only modification to the application of the Ziegler - Nichols equations is controlled by the dFC1 and dfC2 menu items. These menu items control the amount of rate (derivative) that is applied. A dFC1 or dfC2 setting of 3 (factory default) or less allows for less damping. A dFC1 or dfC2 setting of 4 allows for critical damping as set forth in Ziegler - Nichols. A dFC1 or dfC2 setting of 5 or more allows over damping of the process.
Program Setup and Operation
In the secondary menu set tun1or tun2 to SELF. Skip Lrn1/ Lrn2and check to make sure that dFC1 / dfC2 is (are) set to the desired value. Back up to Lrn1 / lrn2 and set to YES. The control will begin the Self Tune function. While the Self Tune function is active, the right hand decimal point on the lower display will blink. When Self Tune is complete, the blinking will stop.
After Self Tune is complete, the tun1 / tun2 setting(s) automatically switch(es) to PID. This allows examination and / or modification of the values calculated. We recommend that you do not change the calculated values unless you have a firm understanding of the parameters involved and their function. For more information on PID tuning, please contact your supplier.
OPERATION AND PROGRAMMING OF OPTIONS
Option C4, Serial Communication.
The serial communications option allows the control to be written to and read from a remote computer or other similar digital device. Communication is allowed through a
See Wiring for Optional Inputs and Outputs for information on wiring the communication lines. Wiring for the
Select the control address and communication baud rate with the Addr and bAUd menu items in the Secure Menu. The address for Zone 1 will be the address selected. The address for Zone 2 will be the address selected for Zone 1 plus one. For example, if Addr is set to 1E, Zone 1 parameters will be addressed through address 1E and Zone 2 parameters will be addressed through address 1F.
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