7.5 QUICK-CAL Operation
The QUICK-CAL button is used to locally initiate a calibration of the
positioner. Pressing and holding the QUICK-CAL button for approximately
3 seconds will initiate the calibration. A QUICK-CAL can
be aborted at any time by briefl y pressing the QUICK-CAL button and
the previous settings will be retained.
If the Quick calibration switch (be careful not to confuse with the
QUICK-CAL button) is set to Auto and the valve/actuator assembly
has the necessary internal stops the calibration will complete
automatically. While the calibration is in progress you will notice a
series of different lights fl ashing indicating the calibration progress.
When the lights return to a sequence that starts with a green light
the calibration is complete. (See the table X for an explanation of the
various light sequences) The initial calibration of extremely large
or very small actuators may require several calibration attempts.
The positioner adapts to the actuator performance and begins each
calibration where the last attempt ended. On an initial installation it
is recommended that after the fi rst successful calibration that one
more calibration be completed for optimum performance.
If the Quick calibration switch is set to Jog, the calibration will
initially close the valve then cause a small jump in the valve
position. The jog calibration process will only allow the user to
manually set the span; zero position is automatically always set
at the seat. If an elevated zero is needed a handheld or other PC
based confi guration software is required.
When performing a jog calibration the LED‘s will fl ash in a
sequence of Y-G-Y-R (yellow-green-yellow-red) which indicates
that the user must use the jog keys to manually position the
valve to approximately 100%. When the valve is approximately
100% open press both the and buttons simultaneously to
proceed to the next step. The valve will then stroke and then wait
while fl ashing the Y-G-Y-R sequence again, allowing the user to
adjust the valve position a second time to exactly 100% using the
jog buttons. When the stem is properly positioned press both
the and buttons simultaneously again to register the 100%
position and proceed. No more user actions are required while
the calibration process is completed. When the lights return to a
sequence that starts with a green light the calibration is complete.
(See the appendix for an explanation of the various light
sequences)
! NOTE: The Quick-Cal function on performs a stroke calibration
and auto-tunes the positioner. It does not perform a
pressure calibration or friction calibration which are necessary
to utilize the full Pro diagnostics