Flowserve 1400 Valtek Logix User Manual
Page 22
46-22
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
System Preparation
WARNING: By definition, the collection of the signa-
ture requires the unmanaged operation of the posi-
tioner. Therefore, the process must be in a safe
operating mode where unexpected movement of the
valve will not cause a hazardous condition.
Before a valve signature can be run, the Transducer
Block must out of service (OOS).
Signature Procedure
The following steps are an example of how to initiate a
ramp signature capture. (Refer to Table IV.)
1. Make sure the process is in safe condition and notify
the control room that the valve will temporarily be
taken off-line.
2. Verify preparedness to proceed.
3. Put the Transducer block MODE_BLK OOS
4. Set SIG_START to desired value.
5. Set SIG_STOP to desired value.
6. Set SAMPLE_TIME to desired value (typically 0.1).
7. In SIG_FLAGS, select; STEP_RAMP,
PRESS_MEAS.
8. Write values to the Logix 1400 digital positioner.
9. Set RAMP_RATE to desired value (typically 100).
10. Write value to the Logix 1400 digital positioner.
11. In SIG_FLAGS, select BEGIN_SIG.
12. Write value to the Logix 1400 digital positioner.
*NOTE: Must not be selected if a custom curve is to be created or edited.
Table III: Transducer Block Characterization Parameters
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13. The valve will stroke to the beginning position, as
defined by SIG_START ,and will begin ramping to
the desired ending position, as defined by SIG_STOP.
Notice that SIG_COUNTER will increment while this
takes place. (Typically approximately 670 data sets
will be collected with the above settings and full
stroke of the valve. Exact numbers will vary.)
14. SIG_FLAGS indicates SIG COMPLETE.
15. Return the MODE_BLK to auto.
16. Notify control room the valve is back on-line. The
stored signature will remain in the Logix 1400 digital
positioner RAM until the either the unit is powered
down, or another signature is taken which overwrites
the previous one.
STEP SIGNATURE
If a step signature was desired, simply do not select
STEP_RAMP in SIG_FLAGS, and then set the
STEP_TIME prior to selecting BEGIN_SIG.
Collection of Stored Signature
The collection of the stored signature is accomplished by
the host system. It is not part of the device. See host
system programming.
A simple utility using National Instruments NI-FBUS is
available from Flowserve for retrieving a signature file.
The retrieved file is stored in a text format that can be
imported into other programs for plotting and analysis.
Contact Flowserve for more details.