Badger Meter SRD/SRI Valve Positioners - Manual (Page 44)

Stroke
The travel span, or stroke, is a 4-byte parameter in the units of travel specified on the units page . It shows how much units of
travel is equivalent to one full stroke .
An alarm can then be set based on the total amount of travel . Travel Sum Limit is the total accumulated travel, in full strokes,
that will trigger this alarm . Small valve movements will be accumulated . To avoid including small continuous motion around
the setpoint to Travel Sum, a Travel Sum Dead Band may be specified, as well .
Increasing Time Response
Response times are the time constants for 0…100% and 100…0% travel . Time constants are determined only if the
positioner is calibrated by Autostart . Since the dynamic behavior of air and spring strokes may be different, they are
individually characterized .
To modify the control valve dynamics, Travel Time Limits may be changed . Inputting values higher than the default (0 .4 sec)
will slow down the response .
Decreasing Time Response
Response times are the time constants for 0 to 100% and 100 to 0% travel . Time constants are determined only if the
positioner is calibrated by Autostart . Since the dynamic behavior of air and spring strokes may be different, they are
individually characterized .
To modify the control valve dynamics, Travel Time Limits may be changed . Inputting values higher than the default (0 .4 sec)
will slow down the response .
Configuration / Parameter
Page 44 August 2014 POS-UM-00011-EN-02