User`s manual
14
WATLOW Series 945 High/Low Limit User's Manual
Calibration
Before attempting to calibrate, make sure you have the
proper equipment called for in each procedure.
Entering the Calibration Menu
Enter the Calibration Menu to change the configuration of the dFL (default
language) parameter. Several parameters are dependent on the dFL param-
eter, they are listed below. It is a good idea to change this parameter, if
necessary, before entering the Setup menu. The factory configures your unit to
your preference, but can be changed at any time.
In the Calibration menu, various input signals must also be supplied in order for
the control to go through its auto calibration. The calibration menu can only be
entered from the LOC parameter in the Setup menu. Press the UP/DOWN
keys simultaneously for 3 seconds. (±1 second). The CAL parameter appears
in the lower display with "no" in the upper display.
Any inadvertent change in the displayed data, when pressing the UP/DOWN
keys, is ignored. Press the UP/DOWN keys to change the upper display to
"yES." Press the MODE key to enter the calibration sequence.
Upon entering the calibration menu, the top display window indicates CAL.
The upper display continues to indicate CAL while the operator walks through
the entire calibration parameter list. The control uses the lower display to
prompt the user as to what the input should be. 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.
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.
Figure 16 -
Entering the
Calibration Menu.
NOTE:
Calibration values
are not retained
unless you are in the
MANUAL mode. Do
not enter the
MANUAL mode until
you are at the
correct input
parameters.
NOTE:
While in the Calibra-
tion Menu, all
outputs are OFF,
except the 4-20mA
output.