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| Neles intelligent valve controller |
The NDX is a 4–20 mA powered micro-controller based intelligent valve controller. The device contains a local user interface enabling configuration and operation without opening the device cover. Configuration and operation can also be made remotely by PC with asset management software connected to the control loop.
After connections of electric signal and pneumatic supply, the micro-controller (μC) continuously reads measurements:
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- Input signal
- Valve position with contactless sensor (α),
- Actuator pressure (I)
- Supply pressure (S)
- Device temperature
Advanced self-diagnostics guarantee that all measurements operate correctly.
Powerful micro-controller calculates a control signal for I/P converter (prestage). I/P converter controls the operating pressure to the pneumatic relay (output stage). Pneumatic relay moves and actuator pressure changes accordingly. The changing actuator pressure moves the control valve. The position sensor measures the valve movement. The control algorithm modulates the I/P converter control signal until the control valve position matches the input signal.
Powerful micro-controller calculates a control signal for I/P converter (prestage). I/P converter controls the operating pressure to the pneumatic relay (output stage). Pneumatic relay moves and actuator pressure changes accordingly. The changing actuator pressure moves the control valve. The position sensor measures the valve movement. The control algorithm modulates the I/P converter control signal until the control valve position matches the input signal.
The video below demonstrates the NDX's operation. Below the video is the complete installation, maintenance and operation manual for your convenience.
