Watlow Series V4 - Manual (Page 13)

Calibration
Before attempting to calibrate, make sure you read through
the procedures carefully and have the proper equipment
called for in each procedure. Make sure the DIP switches
are in the proper position for the input type.
Entering the Calibration Menu
In the Calibration Menu, various input signals must be supplied for the con-
troller to go through its auto calibration. The Calibration Menu can only be
entered from the [`LOC] Lock parameter in the Setup Menu. Press the ¿Up-
arrow/¯Down-arrow 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-
arrow/¯Down-arrow keys, is ignored. Calibration values won't be retained unless
you are in the manual mode. Press the ¿Up-arrow or ¯Down-arrow key to change
the upper display to [`YES] Press ‰Advance to enter the calibration sequence.
Upon entering the calibration menu, the upper display window indicates [`CAL].
It 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 controller
uses the lower display to prompt the user as to what the input should be.
With the [`dFL] parameter, select either [``US] parameters which include dis-
playing °F, rate, reset, and proportional band in degrees or units. Or select
[``SI] (System International) and the displayed parameters are °C, integral,
derivative, and proportional band in % of span.
Once the information has been properly established and maintained for at least
5 to 10 seconds, the ‰Advance key may then be used to display the next prompt.
After the final input is established, press the ‰Advance key twice to return the
controller to the configuration menu at the top of the parameter list.
Figure 13 -
Entering the
Calibration Menu.
NOTE:
While in the Calibration
Menu, the controller out-
put(s) go off and the
alarm output (if present)
is on.
NOTE:
Calibration values will
not be retained unless
you are in the MANUAL
mode. Do not enter the
MANUAL mode until you
are at the correct input
parameters.
V4
1
2
%
V4
1
2
%
The [`rSt] parameter restores the factory calibration values to the Series V4. If
you calibrate your control incorrectly, you have the option to default to the origi-
nal values. Once you leave the [`CAL] menu, the values are entered.
1. Press the ¿ Up-arrow/¯Down-arrow keys simultaneously for three seconds.
The LOC parameter appears in the lower display. Continue holding the
¿Up-arrow/¯Down-arrow keys until the lower display reads [`CAL].
2. Press the ¿Up-arrow key until [`YES] appears in the upper display.
3. ‰Advance through the calibration menu until [`rSt] appears in the lower
display.
4. Press the ¿Up-arrow key until [`YES] appears in the upper display.
5. Press the ‰Advance key and the V4 advances to test the displays.
This procedure is used only to restore calibration, it is not meant to clear values.
Restoring Factory Calibration