Athena Technologies 16C Manual Tuning, Band, Number is the correct Derivative, Time Seconds

Manual Tuning

While some processes other than heat or cool applications may respond successfully to autotuning procedures, the controller may need to be manually tuned for non-temperature processes.

Manual Tuning Procedure

(Zeigler-Nichols PID Method)

This tuning method may be used for non-temperature control processes or if the spread between ambient temperature and process operating temperature is small. For best results, the use of a recording device is required when tuning with this method.

1)For temperature control processes, disable any cooling device used.

2)With the power off and the controller NOT in the Key Lockout security level, apply power and immediately put the controller in Standby mode by pressing the Mode/

Enter key for three seconds, the Raise key until

appears and press the Mode/Enter key again.

3)If you have a direct-acting output, it must be disabled

before proceeding further= .

4)Under the Control menu, make sure that the derivative

term	, the offset term		, and the integral
term	are all set to zero, and the proportional
band	or	is set to the maximum setting.

5)Adjust setpoint to the desired value with the Raise/Lower keys.

6)Press the Mode/Enter key for four seconds, the Raise

key twice , and the Mode/Enter key again to return the controller to normal operation.

7)While monitoring the recording device, decrease the proportional band value by repeatedly halving the value until a small, sustained temperature oscillation is observed. Measure the period of one cycle of oscillation (“T” on the diagram below).

T

	8)	Divide the period of oscillation (T) by eight. The resulting
		number is the correct Derivative		time in seconds.
		Multiply this number by four. This is the correct Integral
		time	in seconds.
28	9)	Multiply the bandwidth value obtained in Step 7 by 1.66
		and enter this as the new proportional band value.