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Table 9 - Operational Specifications
* Specifications are subject to change without notice
Accuracy
Hysteresis and Deadband
Repeatability
Conformity
Start-Up Drift
Long Term Drift
Position Travel Limits
Flow Characteristics
Applied in addition to the control valve's
inherent characteristic.
Position Auto Tune
SVI II AP-1 performs automatic determination
of the optimal valve position control
parameters. In addition to P, I, D, the position
algorithm uses damping, symmetry for
exhaust and fill time constants, dead zone
and magnitude characterization parameters.
Auto Tune is optimized for 5% step changes
with negligible overshoot. After the Auto Tune
process is completed, the user can further
adjust the positioner tuning parameters to
more conservative or to more responsive
values.
Full open position adjustment
Start Up Time (from no power)
Minimum current to maintain HART
+/- 0.5% (typical +/-0. 10% or less) Full Span
+/- 0.3% Full Span
+/- 0.3% Full Span
+/- 0.5% Full Span
Less than 0.02% in first hour
Less than 0.003% per month
Rotary: 18 - 140 degrees
Reciprocating: 0.25" - 2.5" (12mm - 64mm)
Note: Above 2.5" (64mm) consult factory for
mounting instructions.
Linear
Equal Percentage (of 50:1 or 30:1)
Camflex
Quick Opening (inverse of 50:1 equal
percentage)
User Configurable
Tight Shut Off (0 -20% of input)
Proportional gain: 0 to 5, displayed as 0 to
5000
Integral time: 0 to 100 seconds - displayed as 0
to 1000 (1/10s)
Derivative time: 0 to 200 milliseconds
Dead Zone: 0 to +/-5% (0 to 10% deadband)
Padj: +/- 3000 (depends on P)
Beta (non-linear gain factor): -9 to +9
Stroking Time: 0 to 250 seconds
Position compensation coefficient: 1 to 20
Boost: 0 to 20
60 to 100% of actual stop
Less than 200 mS
3.0 mA
A-2
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