Emerson New Spot KJ3222X1-BA1 12P2532X122 CE4003S2B1

Description

First, the CE4003S2B1 linear range of the LVDT must exceed the mechanical range. This

means that when the valve is at either endpoint, one of the secondary voltages

will be at its minimum. The secondary voltage must be large enough at the

endpoint so that if a wire breaks and the secondary CE4003S2B1 voltage goes to zero, the

change of voltage will be large enough to be readily detected. A good guideline

is to ensure that each secondary always contributes at least 10%, positive or

negative, to the demodulated voltage. That is,

min (|A|, |B|) / (|A| + |B|) > 10%

This minimum secondary value is expressed in percentage, is tunable, and is

called MIN2NDRY.

Second, the LVDTs must be calibrated CE4003S2B1 prior to being placed into redundant

service, and for all possible positions, the feedback signal of the Primary should

be near the feedback signal of the backup. This value is called

LVDTTRACKING, and its default value is 1%.

Coil diagnostics rely on a steady voltage across the coil. This voltage will be present

if you adjust the servo valve per the WPC recommendation.

The servo valve has a mechanical bias set-screw that pushes the spool to one side,

allowing flfluid to escape the actuator and slowly close the valve in the absence of

electrical excitation. In the standard setup approximately 200 mV across both coils

opposes the mechanical bias CE4003S2B1 adjustment and holds the spool in the center position,

trapping the flfluid in the actuator, and holding the valve in a fifixed position. Adjusting

coil current changes spool position so that current can flflow into or escape from the

actuator. (Technically, the operation of the servo valve is dependent on current

through the coil and the mechanical bias adjustment. However, the VP is set up to

measure voltage across the coil and at the amplififier output, so voltage

measurements are typically referenced in this description.)

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