Performance Tuner; Stabilizing/Optimizing Valve Response - Fisher FIELDVUE DVC6200 Instruction Manual

DVC6200 Digital Valve Controller
Table 3-1. Factory Default Settings
Setup Parameter
Analog Input Units
Analog In Range High
Analog In Range Low
Control Mode
Restart Control Mode
Self-Test Shutdown
Setpoint Filter Time
Input Characteristic
Travel Limit High
Travel Limit Low
Travel Cutoff High
Travel Cutoff Low
3
Minimum Opening Time
Minimum Closing Time
Polling Address
Command 3 Pressure
For double-acting actuators
For single-acting actuators

Performance Tuner (1-1-2)

Note
The Performance Tuner is available for
instrument level AD, PD, and ODV.
During performance tuning the valve
may move, causing process fluid or
pressure to be released. To avoid
personal injury and property damage
caused by the release of process fluid
or pressure, isolate the valve from the
process and equalize pressure on
both sides of the valve or bleed off
the process fluid.
The Performance Tuner is used to optimize digital
valve controller tuning. It can be used with digital valve
controllers mounted on most sliding-stem and rotary
actuators, including Fisher and other manufacturers'
products. Moreover, 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.
Typically, the Performance Tuner takes 3 to 5 minutes
28
Default Setting
mA
20.0 mA
4.0 mA
Analog (Digital if Multidrop)
Resume Last
All Failures Disabled
Filter Off
Linear
125%
−25%
99.46%
0.5%
0 secs
0 secs
0
differential output pressure
actuator pressure
WARNING
to tune an instrument, although tuning instruments
mounted on larger actuators may take longer.
Access Performance Tuner by selecting Performance
Tuner from the Basic Setup menu. Follow the prompts
on the Field Communicator display to optimize digital
valve controller tuning.
Stabilizing/Optimizing (
Valve Response
Note
Stabilize/Optimize is available for
instrument level HC, AD, PD, and ODV.
WARNING
During Stabilize/Optimize the valve
may move, causing process fluid or
pressure to be released. To avoid
personal injury and property damage
caused by the release of process fluid
or pressure, isolate the valve from the
process and equalize pressure on
both sides of the valve or bleed off
the process fluid.
If after completing setup and calibration the valve
seems slightly unstable or unresponsive, you can
improve operation by pressing the Hot Key and
selecting Stabilize/Optimize, or select
Stabilize/Optimize from the Basic Setup menu.
Stabilize/Optimize permits you to adjust valve
response by changing the digital valve controller
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.
)
September 2010