FVP 110 Fieldbus Valve Positioner Manual
156
GE Energy
S
imple HTG compensated level
Where PV is the tank base pressure, IN_1 is the top pressure, IN_2 is the density
correction pressure, and GAIN is the height of the density tap.
func = (PV -t_1) / (PV - t_2)
After the value of func is calculated, it is multiplied by GAIN, and then BIAS is added to
the result. Finally, high and low output limits are applied, and the result is the term
PRE_OUT. If the mode is Auto, PRE_OUT becomes OUT.
Difficulties with the function, such as division by zero and roots of negative numbers,
should be handled gracefully, without disturbing the status of OUT, or the mode. Division
by zero produces a large number of the proper sign. Infinity cannot be used, as it has a
special meaning for unused limits. Roots of negative numbers produce the root of the
absolute value, with a negative sign. The output has absolute high and low limits.
Supported Modes
O/S, Man, and Auto.
Alarm Types
Standard block alarm.
Mode Handling
The algorithm never changes the mode, even when inputs go bad.
If the mode is changed to Man, an internal value is set to the difference between OUT and
the output of the selected function. When the mode is changed to Auto, the difference
value exponentially decays to zero with a time constant of BAL_TIME.
The output of the calculation function appears in PRE_OUT.
Status Handling
The INPUT_OPTS bit string controls use of auxiliary inputs with less than good status.
The status of unused inputs are ignored.
The status of the output is that of the worst of the inputs used in the calculation after
applying INPUT_OPTS.
Initialization
Standard.
Power Failure Recovery
Standard.
Summary of Contents for FVP110
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Page 97: ...81 Dimensions Standard Specifications Dimensions Figure 46 Single Acting Actuator Dimensions ...
Page 99: ...83 Dimensions Standard Specifications Figure 48 Terminal Configuration ...
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Page 115: ...99 View Object Configuration Table 11 View Object for Transducer Block continued ...
Page 117: ...101 View Object Configuration Table 18 View Object for AO Function Block ...
Page 119: ...103 View Object Configuration Table 20 View Object for OS Function Block ...
Page 121: ...105 View Object Configuration Table 22 View Object for Resource Block ...
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Page 239: ...223 LM Parameter List Link Master Functions ...
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Page 265: ...249 Comments on System Network Software Download Table 88 DOMAIN_DESCRIPTOR ...
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Page 289: ...273 H Customer Maintenance Parts List ...
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