How do I tune a process control loop?


Industry surveys say that nearly half of all processes aren’t accurately tuned. If you read my post on accuracy, stability, and repeatability, you’ll know that a poorly tuned process can result in bad readings, downtime, and wasted materials.

If you use a Honeywell UDC2500, UDC3200, or UDC3500 1/4 DIN universal digital controller, there’s a great built-in function called Accutune that can help make sure your control process is properly tuned.

Honeywell Accutune alters the controller’s output, watches the response, and calculates the three tuning constants: proportional band or gain, rate, and integral or reset. The goal: to match the controller’s response to the actual process operational conditions.

In the video, I’ll walk you through how to use Accutune, and take the time to explain what all the display changes are, and what they mean to you. The process is explained in the individual Honeywell controller user manuals. But I’ve found that watching it happen makes it easier to understand.

If you’re interested in other lessons on instrument configuration and setup, visit Lesman’s YouTube channel for more video demonstrations, or add a comment below and tell me what setup or configuration instructions you’d like me to demonstrate.

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  1. #1 by danstips on June 14, 2018 - 2:27 pm

    In discussing this article, a customer asked: How I can adjust the temperature in a Honeywell UDC 1000?

    The setpoint is changed in the operational mode, not the configuration mode. The controller must in auto mode, not manual mode. Use the shift key to move from one digit to another, use the up/down arrow key to change the setpoint value in the Lower Display. Use the Set key to save the change.

    From the manual: Section 5.2 Setpoint
    After all the wiring connection is completed and power applied, the targeted SP (Setpoint) is now entered. When power is applied, the default display is the PV and SP display. The SP may be entered. (Change the value targeted, and press [Set] key for saving.)
    See http://www.lesman.com/images/setpoint-key.jpg

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