Flowserve Logix 1200e LGAIM0044 - Manual (Page 33)

Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 44-33
Calibration
Quick-Cal Function
The Quick-Cal™ function is a method by which the
valve can be stroke calibrated without using ValTalk or
SoftTools software or the HART 275 communicator.
NOTE: This feature is provided to allow stroke calibra-
tion in the event a HART interface is not available. This
allows the valve to be placed in operation. However,
full configuration can only be accomplished through
ValTalk, SoftTools or the HART 275 handheld commu-
nicator.
The Quick-Cal function only affects the stroke calibra-
tion parameters. Any previous configuration or stored
information is not affected. If the positioner loop cur-
rent has not been calibrated in the field, it defaults to a
loop calibration of 4 mA being a 0 percent command
and 20 mA being a 100 percent command. This can-
not be changed without HART interface. If the loop
has been calibrated in the field, these settings will not
be affected by the Quick-Cal function.
Regarding the Linear vs. Custom DIP switch setting: If
the third Quick-Cal DIP switch is set to Linear, the
transfer characteristic from 4-20 mA input signal to
Control Command will be 1:1. If the DIP switch is set
to Custom, custom characterization will be enabled.
The factory custom characterization curve is equal
percent. If the characterization curve has been modi-
fied in the field, the modified curve will be used.
NOTE: The DIP switch settings only become effective
if the Quick-Cal button is pressed for five seconds. If
the Quick-Cal function is not used, the DIP switch set-
tings have no effect on positioner operation.
Command 0% Calibration Flag
During loop calibration, the Logix 1200 positioner
checks if the value read with the current at the desired
0 percent command level is within range. This error
normally indicates that the loop current was set above
21 mA during this part of the calibration procedure.
(See How to Clear Flags section on page X.)
Command 100% Calibration Flag
During loop calibration, the Logix 1200 positioner
checks if the value read with the current at the desired
100 percent command level is within range. This error
normally indicates that the loop current was set above
21 mA during this part of the calibration procedure.
(See How to Clear Flags section on page X.)
Position 0% Calibration Flag
During stroke calibration, the Logix 1200 positioner
checks if the linkage is placing the stem position sen-
sor in range. If the valve stroke causes stem position
measurement to move out of range in the closed posi-
tion, a Position 0% flag will be generated. The valve
stem will stop in the closed position and the red LED
will blink. The linkage must then be adjusted to bring
the sensor in range. (See How to Clear Flags section
on page X.)
NOTE: The Logix 1200 positioner has a special LED
indication. If the linkage is out of range, the LEDs can
be used as an adjustment guide. The LED will change
from red to yellow when the linkage is brought into
range. Refer to Stroke Calibration Section.
Position 100% Calibration Flag
During stroke calibration, the Logix 1200 positioner
checks if the linkage is placing the stem position sen-
sor in range. If the valve stroke causes stem position
measurement to move out of range in the open posi-
tion, a Position 100% flag will be generated. The valve
stem will stop in the open position and the red LED will
blink. Linkage must be adjusted to bring the sensor in
range. (See How to Clear Flags section on page X.)
NOTE: The Logix 1200 positioner has a special LED
indication. If the linkage is out of range, the LEDs can
be used as an adjustment guide. The LED will change
from red to yellow when the linkage is brought into
range. Refer to Stroke Calibration section.
Command Span Flag
Command span is a check during loop calibration to
verify that the input signal changed between a 0 per-
cent reading and a 100 percent reading. The most
common cause for a Command Span flag is forgetting
to change the current source when asked to set the
100 percent current level. Clear a Command Span
Flag by performing a Command calibration correctly.
Position Span Flag
Position span is a check during stroke calibration to
verify that the valve stem moved. The algorithm waits
to detect if no movement is detected when the valve is
automatically stroked open. Although the algorithm
waits for valve movement, if a large actuator (size 200
or 300) is run at low pressures, it may not detect
movement and stop with a Position Span Error. Any-
thing that could prevent the valve from stroking will
generate a Position Span Error (no supply pressure or
malfunctioning spool valve). Clear a Position Span flag
signal by correcting the problem that is preventing the
valve to stroke and re-calibrate the stroke.