5X00119G01 EMERSON controller module

5X00119G01 EMERSON controller module

Technical data of product parameters

Coil diagnostics rely on a steady voltage across the coil. This voltage will be present 5X00119G01
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 fluid 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 adjustment and holds the spool in the center position,
trapping the f luid in the actuator, and holding the valve in a fixed position. Adjusting
coil current changes spool position so that current can flow into or escape from the 5X00119G01
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 5X00119G01
measure voltage across the coil and at the amplifier output, so voltage
measurements are typically referenced in this descriptionThe hardware is designed so that when the Valve Positioner is powered-up, the
power supply to the servo output is turned off. With no current flow to the servo
valve, it is left under the influence of its mechanical bias adjustment, the assumed
state prior to power-up. In addition, the coil drive D/A convertor is not turned on
until it receives the first output pattern.
As part of the microcontroller’s start sequence, the power supply is turned on, and
then a pattern is written to the coil drive D/A convertor representing 0 volts. The
result is that the servo output is under software control, no current flows between
the Valve Positioner and the servo valve, and no valve movement has occurred.
The Valve Positioner will not remain in Start mode unless a diagnostic error is
detected. The Valve Positioner transitions from Start to Local mode if all of the
following functions execute and return “normal” or “ok” status codes:

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