TE Technology TC-720 - Manual (Page 33)

The controller displays information about the following items:
1. The temperature of the control sensor to 0.01 °C resolution (T1)
2. The output%
3. The Segment (S) number the controller is currently executing, as well as the current set temperature for
that segment
4. The Count (C) number, or time duration, for that segment
• If a ramp/soak program has completed, the screen will display “PROGRAM COMPLETE” momentarily before
returning to the primary screen. If a ramp/soak program has (a) completed or (b) has been terminated by the
user before it has been completed, the controller will return to the Primary Screen and alternately display
“RS=OFF” and “T2=##” if a secondary sensor is used. If no secondary sensor is used, then “RS=OFF” will be
displayed continuously.
• If a ramp/soak program has (a) completed or (b) has been terminated by the user before it has been completed,
the controller will return to the Primary Screen and indicate “OUT= 0%” and “RS=OFF” if the OUTPUT ENABLE
was set to ON prior to running the ramp/soak program. If the OUTPUT ENABLE was set to OFF prior to running
the ramp/soak program, the controller will alternately display “OUT= 0%” and “OUT= OFF”.
NOTE: The controller automatically forces the output% to 0% when a program has (a) completed or (b) has been
exited before completion, regardless of the OUTPUT ENABLE setting.
• If the controller has completed a ramp/soak program or the user has terminated the ramp/soak program before
it has completed and you want to return the controller to PID control, to the RUN PROGRAM menu and allow
the controller to time out with “NO” selected.
To exit out of the ramp/soak program using the controller keypad:
Press the menu key. Then press the arrow key to select EXIT. The controller will pause and then end the program.
If you change your mind about ending the program before it has the controller exits the program, you can press
the other arrow key to select RESUME in order to continue running the program. If the menu key is accidentally
pressed while running the program, RESUME will be highlighted as the default action; after a few seconds, if no
other key is pressed, the controller will automatically resume the ramp/soak program.
2.4.3 SET TEMPERATURE
Values: -40.00 °C to +199.00 °C, or as defined by the limits set by CONTROL RANGE
Default value = 25.00 °C
Description: SET TEMPERATURE is the control temperature that the controller tries to maintain at the Control
Sensor. Note that controller set point should not be set outside the range suitable for (a) the temperature sensor
or (b) the device that is being controlled. Consult TE Technology if you need a thermistor that can provide a
different control range.
2.4.4 PROPORTIONAL BW
Values: 0.05 °C to 100.00 °C
Default value = 5.00 °C
Description: The proportional bandwidth is the temperature span over which the power is proportioned
from -100% to +100% power, centered about the temperature set point. That is, the controller output is -100% at
the end of the bandwidth range above the set point, it decreases to 0% as it reaches the set point, and then
reverses up to +100% as it reaches the bandwidth below the set point.
For example, suppose the controller has a set point of 10.00 °C, the bandwidth is set to 5 °C, and the TE device
needs to cool in order to reach this temperature. The controller will provide -100% power (cooling mode) until the
sensor temperature reaches 12.5°C. At this point, then controller will then begin to proportionally decrease the
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