FBM204 P0914SY Foxboro I/O module
Technical data of product parameters
When an LVDT is wired incorrectly, it is typically a case where secondary pair A is
swapped with secondary pair B.
The LVDT inputs on the VP are implemented with an amplifier stage that includes
diode rectification. 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 FBM204 P0914SY
excitation coil and secondary coils are 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 field. It
is inverted from the signal shown on the calibration graphic. (One way to avoid FBM204 P0914SY
confusion is to connect voltmeter GND to B12, and voltmeter input to C12.)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 FBM204 P0914SY
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.
Product picture display
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