HFAS11S module card TOSHIBA

HFAS11S module card TOSHIBA

Technical data of product parameters

The Valve Positioner continuously runs diagnostics to ensure that the circuit is HFAS11S
operating properly. Certain conditions can cause the Valve Positioner to “dive,”
essentially removing the output signal and allowing the valve to drift shut.
As a general rule, the card will view error conditions on start up as “no-go” or fatal
errors. This means that the Valve Positioner will not generate an output to the valve.
See the following error descriptions for specifics.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 HFAS11S
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 HFAS11S
coil drive D/A convertor readback check is a diagnostic that runs continuously.Contingency is defined as the difference between a target position and the actual
position, when that difference is greater than a defined limit. In the Valve Positioner,
the contingency bit is set if the difference exceeds a programmable limit (default HFAS11S
value is 5%) for a programmable time period (default value is 10 seconds).
Contingency is not a fatal condition.An 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.

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