EMERSON DXA-205 Controller Module Stable Inventory

Description

During the  DXA-205 calibration sequence, observe the valve to ensure it is moving, and that

it is moving in the proper direction. Also, review the calibration constants and

compare them with the ideal setup described below:

• The range of calibration values corresponds to the hexadecimal range of the AD

converter, and is presented to the user  DXA-205 in decimal, ranging from -31768 to

• When an LVDT is properly adjusted and calibrated, the calibration constants

(0% and 100%) will be equal in amplitude and opposite in sign. The amplitudes

for this ideal setup would be approximately 30000.

This result suggest the

following:

— The LVDT is adjusted so that its electrical null point (where secondary A

amplitude = secondary B) matches the  DXA-205 midpoint of the mechanical stroke.

— The programmable gain amplififier on the demodulator is adjusted so that the

electrical ‘stroke’ stays within the input range of the AD converter. Thus, the

valve positioner can detect incremental movement for all valve positions.

— If thermal expansion occurs, the valve positioner will continue to detect

incremental movement, because the calibration is not to the extreme end of

the AD converter range, and because the  DXA-205 magnitude of thermal expansion is

small.

Rolled servo wires can cause the valve to move in the opposite direction. Be sure to

observe and verify the correct movement of the valve. If only one pair is rolled, then

the two pairs will be “fifighting” each other. Use the following procedure to simplify

diagnosis:

1. Disconnect one pair of wires.
2. Calibrate the valve, verifying the correct movement of the valve.
3. Reconnect the fifirst pair of wires.
4. Disconnect the other pair of wires.
5. Calibrate the valve, verifying the correct movement of the valve.
6. Reconnect all the servo wires.
7. Calibrate the valve, verifying the correct movement of the valve.

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