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Control Mode On/Off
1. The Control Mode On/Off turns off the output when the actual tempera-
ture exceeds the setpoint (heat control action). The output will turn on
when the actual temperature falls below the setpoint temperature minus
the hysteresis temperature. Refer to Figure 38.
ON/OFF CONTROL
HYSTERESIS XX.X °F
FIGURE 38. ON/OFF CONTROL HYSTERESIS SCREEN
2. Adjust the hysteresis value on this screen using the arrow keys.
3. Press the MENU key to advance to the RUN TIME Screen.
PID - Proportional Band, Integral and Derivative
PID is the means of selecting the response speed or sensitivity of a propor-
tioned controller to achieve stability in the system. It should be used when
system stability or accuracy requirements are too great for use of on/off control.
NOTE: PID Settings should not be changed from the manufacturers
AUTO TUNE settings unless the operator has advanced training
in the understanding of PID.
AUTO Tune
1.
After selecting the PID screen the next screen to appear will be AUTO
TUNE. Refer to Figure 39. Two choices are available for this selection:
AUTO TUNE ENABLED and AUTO TUNE DISABLED. The recommended
choice for this screen is AUTO TUNE ENABLED.
The default setting is ENABLED. Use the DOWN arrow key to select
either enabled or disabled. Press the MENU key to enter your selection.
NOTE: When AUTO TUNE DISABLED is selected, auto tuning cannot be
initiated using the TUNE key on the front panel.
AUTO TUNE
ENABLED
FIGURE 39. AUTO TUNE SCREEN
