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GREAT SYSTEM INDUSTRY CO. LTD latest company case about Siemens Positioner 6DR5110 - 0NN00 - 0AA0 - Current Signal vs. Actual Valve Opening Inversion
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Siemens Positioner 6DR5110 - 0NN00 - 0AA0 - Current Signal vs. Actual Valve Opening Inversion

2025-12-29

Latest company case about Siemens Positioner 6DR5110 - 0NN00 - 0AA0 - Current Signal vs. Actual Valve Opening Inversion

1. Fault Description

This is an air - to - close valve. When the central control system sends a 4mA current signal, the bottom right corner and the middle of the positioner screen both display 0, the actual valve position is 0%, and the positioner output pressure is 300kPa. The actual requirement is that a 4mA current signal should fully open the valve (100% position), and a 20mA current signal should fully close the valve (0% position).

2. Valve Configuration Details

  • Valve Type: Linear Stroke Sleeve Valve
  • Fault State: FO (Fail - Open)
  • Accessory Configuration:
    • Filter Regulator: ASCO
    • Positioner: 6DR5110 - 0NN00 - 0AA0 (Siemens)
    • Feedback Module: 6DR4004 - 8J
    • Booster Relay: YT - 325N3 (YTC)

3. Troubleshooting Method

Change Parameter Step 7 of the positioner from RISE to FALL, and keep Parameter Step 38 as RISE. After re - calibration:
  • When a 4mA current signal is applied: The bottom right corner and the middle of the positioner screen both display 100, and the actual valve position reaches 100%.
  • When a 20mA current signal is applied: The bottom right corner and the middle of the positioner screen both display 0, and the actual valve position reaches 0%.

4. Problem Analysis

The root cause is incorrect commissioning parameter settings of the positioner. Modifying Parameter Step 7 inverts the relationship between the input current value and the actual valve position; modifying Parameter Step 38 inverts the relationship between the positioner screen display value and the actual valve position.
From an on - site safety perspective: For FO valves, a 4mA current signal is expected to fully open the valve; for FC (Fail - Close) valves, a 4mA current signal is expected to fully close the valve. Valve manufacturers should fully consider this requirement during factory configuration. If the factory configuration is not comprehensive, on - site technical guidance must be provided to enable maintenance personnel to quickly adjust parameters and achieve the desired valve control performance.
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