Flowserve 3400IQ - Manual (Page 30)

Logix 3400IQ Digital Positioner FCD LGENIM3403-00 – 11/07
Signature Procedure
The following steps are an example of how to initiate a ramp signature capture.
Figure 18: Ramp Signature Window
1. Make sure the process is in a 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 out of service.
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 3400IQ digital positioner.
9. Set RAMP_RATE to desired value (typically 100).
10. Write value to the Logix 3400IQ digital positioner.
11. In SIG_FLAGS, select BEGIN_SIG.
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