GE SVI II AP Quick Start Manual page 60

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 charac-
teristic.
Position Auto Tune
SVI II AP performs automatic determination of the opti-
mal 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 magni-
tude characterization parameters. Auto Tune is opti-
mized 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
®
HART Command #3 Mapping
®
HART 6 Commands
60 | =GE Oil & Gas
Table 9: Operational Specifications
®
+/- 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°
Reciprocating: 0.25" - 2.5" (6 mm - 64 mm)
Note: Above 2.5" (64 mm) 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
®
HART 4-20 mA input signal
PV = Valve Position, 0-100%
SV = Actuator Pressure (P1-P2) (N/A for standard diagnostic
version; units sends zero)
TV = Supply Pressure
QV = P2 for double acting units (N/A for standard diagnos-
tic version; units sends zero)
Cmd 9 - Reads device vars w/status.
Cmd 33 - Reads device variables.
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