Setting Yokogawa UT150 temperature controllers on Heatec fuel preheaters
This document provides information for setting Yokogawa UT150 temperature controllers (Figure 1) used on Heatec fuel preheaters (Figure 2). This document along with Yokogawa manuals applicable to the controllers are furnished with Heatec fuel preheaters. If you need help on how to use the buttons on the controller, please refer to the applicable Yokogawa manual. You can call Yokogawa for technical assistance at 1-800-447-9656. Their web site is www.yokogawa.com/.
The controller is used to regulate the temperature of fuel that flows through the preheater. The controller monitors a thermocouple that senses the temperature of fuel flowing through the preheater. It responds to any difference in actual fuel temperature and setpoint (SP) by re-positioning the Triac actuator that opens and closes the valve that controls the flow of hot oil through the preheater. Setpoint SP (in green) is the temperature to which the fuel is to be heated.
Setting up the controller
To set up a new controller for a Heatec fuel preheater, you must first make the settings shown in Figure 3.
These settings are normally made at Heatec before the preheater is shipped. However, if a new controller is installed in the field, these settings must be made first.
After making the settings shown in Figure 3, enter the setpoint for your fuel into the controller. The setpoint for heavy fuel is usually 175–180 degrees F, but may not be the appropriate temperature for the fuel you are using. Note: setpoint is not one of the settings shown in Figure 3.
Finally, you need to auto-tune the controller.
How to navigate the controller menus
The controller has two menus for the settings shown in Figure 3:
Setup Parameters
Operating Parameters
If the controller is new and was not preset at our factory, its display will show that IN is set to OFF when it is first powered. Press the up arrow key repeatedly to display 35. Press SET/ENT key. Thereafter, you navigate the menus as described in the following paragraphs.
To enter the Setup Parameters menu
Press and hold the SET/ENT button for about three seconds until display reads A/M. Repeatedly press the SET/ENT button until display reads LOC. Press the down-arrow button to change the value to –1 (minus 1). If LOC is already set to 1, press down arrow button and set LOC to 0. Press SET/ENT. Now set LOC to –1 and press SET/ENT. You are now in the Setup Parameters menu.
To change data use up/down arrow keys. To accept data press SET/ENT. To scroll to the next prompt press the SET/ENT button again. When finished, press and hold SET/ENT to return to the main display.
To enter the Operating Parameters menu
Press and hold the SET/ENT button about three seconds until display reads A/M. You are now in the Operating Parameters menu. To change data use up/down arrow keys. To accept data press SET/ENT.
To scroll to the next prompt press the SET/ENT button again. When finished, press and hold SET/ENT to return to the main display.
To Auto-Tune The Controller
Go to the Operating Parameters menu and set AT to on. The controller will auto-tune for about 30 minutes, depending on response of the system, and then set to OFF. You can now note the new PID parameters.
To switch between Auto and Manual
Press and hold the SET/ENT button for about three seconds until the display reads A/M. Choose either Auto or Manual with the up/down arrow keys. Press SET/ENT to accept and escape out to the main display.
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