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8 Controller Operation
This chapter discusses in detail how to operate the dry-well temperature con
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troller using the front control panel. Using the front panel key-switches and
LED display the user may monitor the well temperature, set the temperature
set-point in degrees C or F, monitor the heater output power, adjust the control
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ler proportional band, set the cut-out set-point, and program the probe calibra
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tion parameters, operating parameters, serial and IEEE-488 interface
configuration, and controller calibration parameters. Operation of the functions
are summarized in Figure 6 on page 24.
In the following discussion a solid box around the word SET, UP, EXIT or
DOWN indicates the panel button while the dotted box indicates the display
reading. Explanation of the button or display reading are to the right of each
button or display value.
8.1 Well Temperature
The digital LED display on the front panel allows direct viewing of the actual
well temperature. This temperature value is what is normally shown on the dis-
play. The units, C or F, of the temperature value are displayed at the right. For
example,
20.00 C
Well temperature in degrees Celsius
The temperature display function may be accessed from other functions by
pressing the “EXIT” button.
8.2 Reset Cut-out
If the over-temperature cut-out has been triggered then the temperature display
will alternately flash,
cut-out
Indicates cut-out condition
The message will continue to flash until the temperature is reduced and the
cut-out is reset.
The cut-out has two modes — automatic reset and manual reset. (See Section
8.11.2.2) The mode determines how the cut-out is reset which allows the instru
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ment to heat up again. When in automatic mode, the cut-out will reset itself as
soon as the temperature is lowered below the cut-out set-point. With manual re
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set mode the cut-out must be reset by the operator after the temperature falls
below the set-point.
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8 Controller Operation