Emerson Fisher FIELDVUE DVC6000f, Инструкция по эксплуатации

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Transducer Block
December 2009 4-23
Travel Integral Enable
Travel Integral Enable (TVL_INTEG_ENABLE [44.1])
is used to enable the integral setting to improve static
performance by correcting for error that exists
between the travel target and actual travel.
Travel Integral Gain
Travel Integral Gain (SERVO_RESET [19]) (also
called reset) is the ratio of the change in output to the
change in input, based on the control action in which
the output is proportional to the time integral of the
input.
Travel Integral Dead Zone
Travel Integral Dead Zone (TVL_INTEG_DEADZ
[44.4]) is a window around the Primary Setpoint in
which the integral action is disabled. The dead band is
configurable from 0 to 2%.
Travel Integral Limit Hi
Travel Integral Limit Hi (TVL_INTEG_LIM_HI [44.2])
provides an upper limit to the integrator output. The
high limit is configurable from 0 to 100% of the I/P
drive signal.
Travel Integral Limit Lo
The Travel Integral Limit Lo (TVL_INTEG_LIM_LO
[44.3]) provides a lower limit to the integrator output.
The low limit is configurable from
−
100 to 0% of the I/P
drive signal.
Performance Tuner
WARNING
During the performance tuning the
valve may move. To avoid personal
injury and property damage caused
by the release of pressure or process
fluid, provide some temporary means
of control for the process.
Performance Tuner is used to optimize digital valve
controller tuning. It will move the valve slightly and
monitor the effects of small tuning changes until an
optimum control response is achieved. Because the
Performance Tuner can detect internal instabilities
before they become apparent in the travel response, it
can generally optimize tuning more effectively than
manual tuning.
Stabilize/Optimize
WARNING
During Stabilize/Optimize the valve
may move. To avoid personal injury
and property damage caused by the
release of pressure or process fluid,
provide some temporary means of
control for the process.
If after completing initial setup and calibration the
valve cycles or overshoots, or is sluggish, you can
improve operation running Stabilize/Optimize.
Stabilize/Optimize is included with the device
description (DD) firmware. Stabilize/Optimize is
accessible from the transducer block and permits
changing the transducer block set point a small
amount to see if the valve is unstable or unresponsive.
If valve response is unsatisfactory, the method permits
adjusting the digital valve controller tuning to improve
response.
If the valve is unstable, select Decrease Response to
stabilize valve operation. This selects the next lower
tuning set (e.g., F to E). If the valve response is
sluggish, select Increase Response to make the valve
more responsive. This selects the next higher tuning
set (e.g., F to G).
If after selecting Decrease Response or Increase
Response the valve travel overshoot is excessive,
Increase Damping or Decrease Damping can be used
to select a damping value not represented in a
predefined tuning set. Select Decrease Damping to
select a damping value that allows more overshoot.
Select Increase Damping to select a damping value
that will decrease the overshoot.
When valve operation is satisfactory, select Exit.
Before exiting, you are asked if you want to return the
transducer block mode to Auto. Select Yes to change
the transducer block mode to Auto. Select No to leave
the transducer block in its current mode.
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