Sterlco SEU Series Economical Water TCU - Manual (Page 30)

WTR1-600 Chapter 5: Operation 30 of 42
5-3 Starting the Temperature Control Unit
You can also use these steps to AUTO-TUNE the Controller, and operate the Unit
with the Controller.
The Auto-Tune function lets you fine-tune the control PID to process requirements. Activate the
Auto-Tune function whenever the process under control changes. Don't be alarmed by control
response. It may take the process temperature above and below the set points as many as three (3)
times. It will then level off and control to the process set point. Auto-tuning can take up to 45
minutes, and is best done before any product is run.
1. Push the ON/OFF rocker switch to the ON ( | ) to energize the unit and begin the
temperature control cycle. The switch will be illuminated whenever the unit is on.
2. The unit will automatically vent for approximately one minute.
3. If needed, press and hold the vent button to purge any additional air from the process
loop.
4. Set process temperature (PV) by pressing the Scroll key until SP1 appears in
the upper display. Then press the Up Arrow or Down Arrow keys to
adjust the setpoint.
5. If the unit does not maintain its process value, allow your process to reach the set
point temperature. Then Autotune the control by pressing the the Scroll key until
SP1 appears in the upper display. Then press the Up Arrow or Down
Arrow keys to activate the tune.