Emerson Fisher FIELDVUE DVC6000, Инструкция по эксплуатации, Страница: 66 / 162

DVC6000 Digital Valve Controllers
September 2013 4-6
Table 4-3. Conditions for Modifying FIELDVUE DVC6000 Digital Valve Controller Parameters (Continued)
Parameters
In Service/
Config Protected
In Service/
Config Unprotected
Out of Service/
Config Protected
Out of Service/
Config Unprotected
Flash ROM Fail
No Free Time
Ref Voltage Fail
Drive Current Fail
Critical NVM Fail
Temp Sensor Fail
Press Sensor Fail
Tvl Sensor Fail - - -
- - -
- - -
- - -
- - -
- - -
- - -
- - - - - -
- - -
- - -
- - -
- - -
- - -
- - -
- - - - - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
—indicates parameter may be modified for instrument mode and protection shown.
1. In firmware 2 thru 6 this parameter is labeled Minimum Opening Time.
2. In firmware 2 thru 6 this parameter is labeled Minimum Closing Time.
Note
When selecting a tuning set for a
DVC6015, DVC6025 or DVC6035 remote
mount unit, it may be necessary to
reduce the tuning set, due to the
effects of the long tubing between the
digital valve controller and the
actuator.
In addition, you can select User Adjusted or Expert,
which allows you to modify tuning of the digital valve
controller. With User Adjusted, you specify the
proportional gain; an algorithm in the Field
Communicator calculates the velocity gain and minor
loop feedback gain. With Expert you can specify the
proportional gain, velocity gain, and minor loop
feedback gain.
Note
Use Expert tuning only if standard
tuning has not achieved the desired
results.
Stabilize/Optimize or Performance
Tuner may be used to achieve the
desired results more rapidly than
Expert tuning.
Table 4-5 provides tuning set selection guidelines for
Fisher, Baumann, and Gulde actuators. These tuning
sets are only recommended starting points. After you
finish setting up and calibrating the instrument, you
may have to select either a higher or lower tuning set
to get the desired response. You can use the
Performance Tuner to optimize tuning.
Integral Enable—Yes or No. Enable the integral
setting to improve static performance by correcting for
error that exists between the travel target and actual
travel. Travel Integral Control is enabled by default.
Integral Gain—Travel Integral Gain 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.
Stabilize/Optimize —Stabilize/Optimize permits
you to adjust valve response by changing the digital
valve controller tuning.
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,
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 finished, select done.
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