Fisher FIELDVUE DVC6200f Instruction Manual page 66

Detailed Setup—Transducer Block
July 2013
Stabilize/Optimize may be used to achieve the desired results more rapidly than 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.
D Travel Proportional Gain—Travel Proportional Gain (SERVO_GAIN [18]) is the proportional gain for the travel control
tuning set. Changing this parameter will also change the tuning set to Expert.
D Travel Velocity Gain—Travel Velocity Gain (SERVO_RATE [20]) is the velocity gain for the travel control tuning set.
Changing this parameter will also change the tuning set to Expert.
D Travel MLFB Gain—Travel MLFB Gain (TVL_MLFB_GAIN [44.5]) is the minor loop feedback gain for the travel control
tuning set. Changing this parameter will also change the tuning set to Expert.
D 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.
D 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.
D 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%.
D 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.
D 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.
D Performance Tuner
WARNING
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.
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.
D Stabilize/Optimize
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.
64
Instruction Manual
D103412X012