Emerson CPU processor CE4012S2T2B4 module

Description

This calibration CE4012S2T2B4 sequence causes the valve to travel to the electrical null point

of the LVDT. Null point calibration can be requested at the same time as full

calibration, in which case the movement sequence is CE4012S2T2B4 the full calibration

sequence. However, the valve stops at the null point when it is encountered.

This calibration sequence is executed to CE4012S2T2B4 re-establish 0% position, 100%

position, and feedback gain.

When full calibration is requested the module enters local mode, requiring the

Controller to track. The module then moves the value to the 0% position. The

fifirmware checks for position feedback between the arbitrary limits of –9.7 volts

and –2.0 volts. If the voltage is less (more negative) than –9.7 volts, the fifirmware

reduces gain to make the voltage more positive than –9.7. If the voltage is more

positive than –2.0 volts, the gain is increased until the voltage is more negative

than –2.0 volts. During these two sequences, the gain is tested to insure it does

not go out of allowable range.

If the voltage is between –9.7 and –2.0, then gain is recalculated to set the

voltage to the arbitrary target voltage of –0.35 volts, and the fifirmware sequence

advances to the CE4012S2T2B4 next state, which will take the value to 100%.

At this point in the sequence, the demodulator gain has been set to a value that

is a maximum allowable value. The gain may be reduced at the other end of the

stroke, but will not be increased.

Now the valve moves to the 100% position. The feedback voltage is examined,

and if it exceeds 10.0 volts, feedback gain is reduced. Once feedback voltage is

less than +10.0 volts, it is recorded as the 100% calibration value.

The valve moves back to 0% and the voltage at 0% is recorded. Feedback gain

is not adjusted.

The last step is to write 0% position, 100% position, and feedback gain to the

EE memory.

Once the data is recorded in EE memory, the fifirmware clears a restriction flflag,

allowing the module to transfer from local mode back to normal mode. At this

point the valve is under the control of the MA station and will return to the

previous position according to the tuning of the MA.

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