Watlow Series 945, 1/4 DIN Microprocessor-BasedAuto-tuning Control - Manual (Page 33)

Appendix 33
WATLOW Series 945 User's Manual
Upon entering the calibration menu, the top display window indicates CAL. The
upper display continues to indicate CAL (with the exception of calibration of the 4-
20mA output) while the operator walks through the entire calibration parameter list.
While calibrating the 4-20mA output, the upper display contains a numeric value to
be slewed up or down until the output value is correct. The control uses the lower
display to prompt the user as to what the input should be.
The dFL parameter allows you to select either U.S. parameters which include
displaying rate, reset,
°
F, and proportional band in degrees or units, or select SI
(System International). The parameters displayed here are integral, derivative,
°
C,
and proportional band in % of span.
Once the information has been properly established and maintained for 5 to 10
seconds, the MODE key may then be used to display the next parameter. After the
final input is established, press the MODE key twice to return the unit to the
configuration menu at the top of the parameter list.
Restoring Factory Calibration
The rSt parameter restores the factory calibration values to the Series 945. If you
calibrate your control incorrectly, you have the option to default to the original
values. Once you leave the CAL menu, the values are entered.
1. Press the UP/DOWN keys simultaneously for three seconds. The LOC
parameter appears in the lower display. Continue holding the UP/DOWN keys
until the lower display reads CAL.
2. Press the UP key until YES appears in the upper display.
3. MODE through the calibration menu until rSt appears in the lower display.
4. Press the UP key until YES appears in the upper display.
5. Press the MODE key and the 945 advances to test the displays.
This procedure is used only to restore calibration, it is not meant to clear
values.
Calibration