Fisher FIELDVUEDVC6200f Instruction Manual page 49

Instruction Manual
D103412X012
Note
Use Expert tuning if standard tuning has not achieved the desired results.
Stabilize/Optimize may be used to achieve the desired results more rapidly than manually editing the Expert tuning.
Table 3‐2 provides tuning set selection guidelines for Fisher and Baumann actuators. These tuning sets are
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.
For an actuator not listed in table 3‐2, you can estimate a starting tuning set by calculating the casing or cylinder
volume. Then, find an actuator in table 3‐2 with the closest equivalent volume and use the tuning set suggested for
that actuator.
Travel Proportional Gain (TVL_PROP_GAIN [72.6]) is the proportional gain for the travel control tuning set. Changing
this parameter will also change the tuning set to Expert.
Travel Velocity Gain (TVL_RATE [72.7]) is the velocity gain for the travel control tuning set. Changing this parameter
will also change the tuning set to Expert.
Travel MLFB Gain (TVL_MLFB_GAIN [72.5]) is the minor loop feedback gain for the travel control tuning set. Changing
this parameter will also change the tuning set to Expert.
Travel Integral Enable (TVL_INTEG_ENABLE [72.1]) 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 (TVL_RESET [72.8]) (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 (TVL_INTEG_DEADZ [72.4]) 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 (TVL_INTEG_LIM_HI [72.2]) 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 (TVL_INTEG_LIM_LO [72.3]) 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 performance tuning the valve will move,which may cause 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.
Performance Tuner is used to determine 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.
DVC6200f Digital Valve Controller
Detailed Setup - Transducer Block
February 2017
49