Watlow Electric Micro-Based Autotuning Control SERIES 980/985 - Manual (Page 37)

Calibration Menu
In the Calibration Menu, various input signals must 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.
Any inadvertent change in displayed data when pressing UP & DOWN, is
ignored. At the CAL parameter, press the AUTO/MANUAL key twice to enter
the MANUAL mode. Calibration values are not retained unless in MANUAL
mode.
Upon entering the calibration menu, the top display window indicates CAL and
keys are inactive until all keys are released. 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 that is 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.
Once the input has been properly established and maintained for at least 10
seconds, the MODE key may then be used to display the next prompt. After
the final input is established, another press of the MODE key returns the unit to
the configuration menu at the top of the parameter list.
Cal Restore
If you make a mistake in calibrating your control, the rSt prompt at the end of
the calibration menu restores the original factory calibration settings. Simply
select yes and press the MODE key. The original factory calibration values are
restored. Figure 34 on the next pages shows the calibration prompt.
l
CAUTION:
Incorrect calibration
will affect the
accuracy and should
only be attempted
with proper equip-
ment and by quali-
fied personnel.
Figure 33 -
Entering the
Calibration Menu.
NOTE:
Calibration values
are not retained
unless you are In the
MANUAL mode.
NOTE:
While in the Calibra-
tlon Menu, all
outputs are OFF,
except the 4-20mA
output.
Appendix
WATLOW Series 980l985 User’s Manual 37