Emerson dcs card 5X00501G01 5X00502G01 high-density AI input

Description

Local-manual mode 5X00502G01 is a transition mode used if the Controller is required to track

valve position on startup. In the Servo Driver module, there is no requirement for

tracking. Local-manual mode is a transition mode with no restrictions to normal

mode.

Local-manual mode is also used for calibration sequences.

Calibrate mode is a submode of local-manual mode. 5X00502G01 Calibration sequences are

commanded from the Controller or through the local serial port.

The Servo Driver is calibrated by entering a command through a personal computer

connected to the local serial port.

The 5X00502G01 following calibrate sequences are supported:

• Zero Hot Cal

This calibration sequence is executed to re-establish the 0% position. It is useful

after the valve has been fully calibrated and the mechanical assembly has been

heated and expanded. It avoids fully opening the 5X00502G01 valve.

Feedback gain is not adjusted during the hot cal sequence.

• Top Hot Cal

This calibration sequence is executed to re-establish the 100% position. It is

useful after the valve has been fully calibrated and the mechanical assembly has

been heated and expanded. It avoids fully closing the valve.

Feedback gain is not adjusted during the hot cal sequence.

• 5X00502G01 Full Calibration

This calibration sequence is executed to re-establish 0% position, 100%

position, and feedback gain.

Arbitrary limits are established for the full calibrate sequence. A valve with an

8 inch stroke that can expand by 1/8 inch is envisioned. For this valve, thermal

expansion is 1/64 or 1.5%. Since the A/D converter range limit is +/- 10.4 volts,

the limit at 100% is arbitrarily set at 10.0 volts, or 2% of the electrical range

from the end of the converter range. 5X00502G01 The target range for 100% when adjusting

gain is 9.9 volts to 10.0 volts.

At zero percent, the outer limit is set at -10.0 volts and the gain may be reduced

to bring voltage below this level. No inner limit is used, assuming that during

mechanical installation, the LVDT position is “eyeballed,” and if “cheated” in

any direction, would be “cheated” so that the 0% position were closer to the

NULL point, and more solidly in the linear range of the LVDT, than the 100%

position. As an example, the result would be that the 100% calibration value

would be close to 10 volts, and the 0% calibration might be 9 volts. Another

scenario is the throttle valve situation, where the 100% calibration value would

be 10 volts, and the 0% value might be 3 volts.

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