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Commissioning of Traditional and Smart Valve Positioners
Release time:
2026-04-07 15:22
I. Calibration of Traditional Valve Positioners
1) Zero-point adjustment
When the signal source is set to 4 mA, if the valve position indicator is not at the zero position, open the valve positioner and slowly adjust the zero-adjustment knob until the valve position indicator reads zero.
2) Range Adjustment
When the signal source is set to 20 mA, if the valve position pointer is not at the maximum position indicated on the nameplate, adjust the span knob of the positioner until the pointer indicates the maximum position.
3) After calibrating the span and zero, apply 8 mA, 12 mA, 16 mA, and 20 mA signals to the signal source, respectively, and observe that the valve position indicator points to 25%, 50%, 75%, and 100%, respectively. If the indication is inaccurate, make fine adjustments to the zero-adjustment knob until the indication becomes accurate. If the adjustment still does not yield satisfactory results, it indicates insufficient stroke; loosen the span-adjustment lock screw, turn the span-adjustment screw to adjust the stroke, and then tighten the lock screw after completion. Repeatedly adjust the zero and span until the actuator’s stroke falls within the specified tolerance range.
II. Commissioning of the Intelligent Valve Positioner
1) Debugging Preparation
Verify that the positioner is accurately connected to the actuator and that all wiring is correct. Supply the positioner with a working air source of 1.4–7 bar and a power supply of 18–35 V or a 4–20 mA current source. Using the three control buttons, check that the actuator can move freely throughout its full adjustment range. Then adjust the actuator linkage until it reaches a horizontal position; the display should indicate a value between 48% and 52%. This will enable the positioner to measure displacement more accurately; if not, adjust the positioner linkage accordingly.
2) Perform initialization automatically or manually
Given the wide range of applications for this type of actuator, the initialization process essentially involves the positioner’s microprocessor acquiring actuator data to establish a match with that specific actuator. The positioner can automatically determine the actuator’s direction of action and stroke duration, while only a few additional parameters need to be set manually; most parameters can remain at their default settings.
3) Copy initialization data, locator replacement
When a positioner malfunctions and needs to be replaced, but the process system does not permit reinitialization of the positioner, this function can be used for positioner commissioning. To replace an uninitialized positioner with another that is permitted by the actuator, data can be acquired from the positioner to be replaced using a HART communicator and then copied to the new positioner, thereby meeting the process system’s requirements. Once the process system is shut down, the positioner can then be reinitialized to enhance control accuracy.
2020-01-19
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