Rockwell Automation 1771-TCM TEMPERATURE CONTROL - Manual (Page 42)

5–7 Configuring the Loops
Publication 1771Ć6.4.5 - January 1997
In general, a smaller TPO period provides smoother control unless
the minimum on time is greater than 10% of the TPO period. If the
the minimum on time is greater than 10% of the TPO period, the
TPO signal will not be able to provide any control of the temperature
until the temperature has moved away from the set point far enough
to require a 10% TPO signal.
A long minimum on time reduces wear on the heating or cooling
contactors by reducing the cycling when the duty cycle is low.
However, a short minimum on time provides smoother control,
especially if the TPO period is short.
To configure a loop, access the Loop Configuration screen as
follows:
1. At the Module Manager screen, select the module.
2. Select the loop to configure.
3. From the
Loop pull-down menu, select Configure.
Displaying the popup Loop menu
To display a popup version of the Loop menu, click on the right
mouse button while the cursor is over the loop list.
The Loop Configuration screen for the loop you selected appears.
Accessing the Loop
Configuration Screen
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