P026MX spare CPU module PLC controller

P026MX spare CPU module PLC controller

Technical data of product parameters

The Valve Positioner has the ability to read and convert the coil drive D/A convertor
output signal that drives the valve. If the value readback (converted by the A/D FBM204 P0914SY
converter) and the value that was output do not match within a deadband, and for a
pre-defined period of time, a severe fatal error is assumed. In this case, the Valve
Positioner is “flying blind.” It cannot confidently determine valve position or
control the output. The Valve Positioner will remove drive power (dive) from the
entire Electronics module’s FVP field card and go through a reset sequence. The FBM204 P0914SY
coil drive D/A convertor readback check is a diagnostic that runs continuouslyAn open coil is detected by measuring voltage across the current limiting resistors
on the servo output. When zero volts are detected, either the coil is open, the servo
output is at zero, or the mechanical bias on the servo valve is incorrect. When an
error condition is detected, an internal “open” bit is set.
Typically, the servo coil voltage is -200 mV when the valve is in a stable, controlled
position and the servo valve mechanical bias is properly adjusted. If the servo output FBM204 P0914SY
amplifier voltage amplitude falls below 100 mV, the internal bit is cleared, as though
no error condition exists. If servo output voltage is greater than 100 mV, the
difference between servo output voltage and coil voltage is compared to 50 mV, and
if it is less, the ‘open’ bit is set.

Product picture display

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Introduction to main products

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reminder

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