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Logix 3400MD Digital Positioner FCD LGENIM3404-00 – 9/09
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arrows. See the detailed instructions in Section 7.6 on how to perform a
manual calibration using the Jog buttons.
0
WARNING:
During the RE-CAL operation the valve may stroke
unexpectedly. Notify proper personnel that the valve will stroke,
and make sure the valve is properly isolated.
7.5 RE-CAL Operation
NOTE:
The unit must be in OOS mode before a calibration sequence can
begin.
The RE-CAL button is used to locally initiate a calibration of the positioner.
Pressing and holding the RE-CAL button for approximately three seconds will
initiate the calibration. If the Config-Switches option is enabled, the settings
of all the configuration switches are read and the operation of the positioner
adjusted accordingly. A RE-CAL can be aborted at any time by briefly
pressing the RE-CAL button and the previous settings will be retained.
If the Quick Calibration switch (be careful not to confuse this with the
RE-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 flashing
indicating the calibration progress. When the lights return to a sequence
that starts with a green light the calibration is complete. An explanation of
the various light sequences follows. The initial calibration of extremely large
or 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 first successful calibration that one more calibration be completed for
optimum performance.
0
WARNING:
When operating using RE-CAL or local control, the valve
will not respond to external commands. Notify proper personnel that
the valve will not respond to remote command changes, and make
sure the valve is properly isolated.
7.6 Manual Jog Calibration Operation
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 configuration software is required.
When performing a jog calibration, the LEDs will flash in a sequence
of Y-G-Y-Y (yellow-green-yellow-yellow) which indicates that the user
must use the Jog buttons
( and )
to manually position the valve to the
100% position. When the stem is properly positioned press both the Jog
buttons
( and )
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. An explanation of the
various light sequences follows.
7.7 Local Control of Valve Position
Local control of valve position can be achieved from the user interface by
holding down both Jog buttons and the RE-CAL button simultaneously for
three seconds. While in this mode the LEDs will flash a Y-G-Y-Y (yellow-
green-yellow-yellow) sequence. Use the two Jog buttons ( and ) to
manually control the position of the valve. To exit the local control mode and
return to normal operation, briefly press the RE-CAL button.
7.8 Factory Reset
To perform a factory reset, disconnect power, hold the RE-CAL button down,
and reconnect power. Performing a factory reset will cause all of the internal
variables, including calibration, to be reset to factory defaults. The positioner
must be recalibrated after a factory reset. User configured limits, alarm
settings, and valve information will also need to be restored.
0
WARNING:
Performing a factory reset may result in the inability to
operate the valve until reconfigured properly. Notify proper personnel
that the valve may stroke, and make sure the valve is properly
isolated.
7.9 Logix 3400MD
Status Condition
The blink codes used to convey the status of the Logix 3400MD
digital posi-
tioner are described in the table below. In general, any sequence starting with
a green light flashing first is a normal operating mode and indicates that there
are no internal problems. Any sequence starting with a yellow light flashing
indicates that the unit is in a special calibration or test mode, or that there
was a calibration problem. Any sequence starting with a red light flashing
indicates that there is an operational problem with the unit.
