EMERSON KJ3002X1-BF1 12P1732X042 eddy current sensor

Description

When an LVDT is wired incorrectly, it is KJ3002X1-BF1 12P1732X042 typically a case where secondary pair A is

swapped with secondary pair B.

The LVDT inputs on the VP are implemented with an amplififier stage that includes

diode rectifification. Therefore, the two individual wires of a secondary can be

swapped and it makes no difference to the VP.

The wires of the excitation oscillator could also be swapped with no effect. The

excitation coil and secondary coils are KJ3002X1-BF1 12P1732X042 all isolated, so the VP can see only the AC

component.

If the secondaries are wired correctly, and the LVDT is in approximately the correct

position, feedback voltage shown on the VP calibration graphic is negative when

the valve is closed, and positive when the valve is open.

The position feedback voltage is also available on terminals B12 and C12. This

signal is used for factory testing and can be used for response testing in the fifield. It

is inverted from the signal shown on the calibration graphic. (One way to avoid

confusion is to connect voltmeter GND to B12, and voltmeter input to C12.)

Demodulator gain directly affects the calibration values at the endpoints. Reducing

demodulator gain can be helpful in diagnosing VP problems. Note that the VP must

be re-seated, or must be reset, in order to make any new demodulator gain setting

effective.

A simple test can be performed to verify correct KJ3002X1-BF1 12P1732X042 wiring and polarity.

1. Set 0 and 100% calibration values to –31000 and +31000.
2. Reduce demodulator gain to a low value (2000).
3. Reseat or reset the VP to cause the new demodulator gain to take effect.

4. Set target position to 0%, 100%, then 50% and observe valve movement at all

settings.

In this test, you are informing the VP that the electrical valve ‘stroke’ is +/- 10 volts,

but you have adjusted demodulator gain so that the actual electrical stroke is much

smaller. (Perhaps +/- 1 volt, depending upon the LVDT.) The idea is to force the

actual electrical ‘stroke’ to be fully contained within the range of the VP input

system.

By setting the target position to 0% or 100%, you can verify correct wiring and

polarity. If the valve goes to the correct endpoints, then you should set the target

position to 50% as an additional test. The valve should go to the LVDT’s midpoint

and hold there.

If the valve does not go to the correct endpoint, then there is a KJ3002X1-BF1 12P1732X042 wiring error, and you

should fifirst remove one of the servo wire pairs, and repeat the test. The next step

would be to swap the wires of the remaining servo wire pair, followed by swapping

the wire pairs of LVDT input A with input B.

When the valve moves correctly, verify that the valve operates according to the

recommended practice where negative voltage opens the valve, and positive voltage

closes it.

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