Calibration Restore Prompt; The Dfl Prompt; Input Calibration; Output Calibration - Watlow Controls 981 Series Calibration Manual

Calibration Restore Prompt

If you make a mistake while calibrating your control, the rSt prompt near the end of
the calibration menu restores the original factory calibration settings. At the rSt
prompt, simply press the Up or Down key to change the upper display to read YES;
press the Mode key. The original factory calibration values are restored.

The dFL Prompt

To set the operating parameter defaults for either domestic or international, use
the dFL (default) prompt at the end of the Calibration menu. Once you have
entered the Calibration menu, use the Mode key to advance to the dFL prompt.
Press the Up or Down key to change the upper display to US or SI. For domestic
prompts, select US and receive:
° F
•
• Proportional band in degrees or units
For international prompts, select SI and receive:
° C
•
• Proportional band in % of span

Input Calibration

Once you enter the Factory menu, press the Up or Down key until the CAL prompt
appears in the upper display with Fcty in the lower display. Press the Mode key to
advance to the first calibration prompt. See Figure 2 on the previous page. The
upper display shows the prompt default no, while the lower display indicates the
input signal prompt.
Each input calibration prompt is preceded by an A or B, signifying Input 1 or 2
respectively. Refer to the Calibration menu on the previous page again. Before
advancing to the next prompt when calibrating, always apply the correct input signal
and allow to stabilize for 10 seconds before changing the upper display to YES. If
the parameter is left at no, the calibration information will not be entered. Once the
appropriate parameters are calibrated, press the Display key to exit the CAL menu.

Output Calibration

After calibrating the Input 1 and 2 prompts, the next prompts apply to Output 1
through 3 which are for process outputs only.
Model numbers affected are
The prompt in the lower display indicates the output signal while the upper display
reads a hexidecimal value which matches the output value. The upper display
value is for internal use only and should be ignored.
Each output calibration prompt is preceded by a 1, 2, or 3, signifying Output 1, 2, or 3
respectively. If your unit does not have Output 2 or 3, these prompts will not appear.
Once the appropriate parameters are calibrated, press the Display key to exit the
CAL menu.
• Rate in minutes
• Reset in repeats per minute
• Derivative in minutes
• Integral in minutes per repeat
Output 1 98_ _ - _ _ F _ - _ _ _ _
Output 2 98_ _ - _ _ _ F - _ _ _ _
Output 3 98_ _ - _ _ _ _ - M_ _ _
98_ _ - _ _ _ _ - N_ _ _
rSt/dFL Prompts
WATLOW Series 988 Calibration Manual
7