Badger Meter SRD/SRI Valve Positioners - Manual (Page 29)

Autostart Duration and Success
The duration of Autostart depends on the actuator size (volume) and hysteresis of the actuator . For small actuators, it may only
take a few minutes, whereas actuators with large volumes may require significantly longer times . The time can be reduced in
some cases by using the spool valve version or by applying a volume booster . Each of the stages in the Autostart process will
be identified by the LCD and/or red+green LEDs .
If Autostart is not successful, it may terminate before reaching the last step, which means that the positioner is not properly
calibrated . To check whether Autostart is successfully completed, select Valve Status from the Test option in the main menu .
Potential reasons for an Autostart not being successful are:
• Positioner mounting problem . Feedback lever or coupling in wrong orientation .
• Inadequate supply pressure
• Large actuator . Use Endpoint calibration and tune manually . Employ boosters to increase output capacity .
• Hardware problem
If Autostart cannot be successfully executed, see
“Endpoint Calibration” on page 29 .
The Autostart feature can also be manually accomplished at the positioner by push buttons .
Endpoint Calibration
This function will automatically detect the valve end points . It accomplishes this by using only the first of the four autostart
steps . This process determines the valve mechanical travel stops, zero and span but not the tuning set . Accordingly, it
requires much less time than a full Autostart . If the tuning parameters are available for the control valve from previous testing
or existing data, then Endpoints calibration and manually entering tuning parameters (previous section) will shorten the
positioner setup time significantly .
Startup
Page 29 August 2014 POS-UM-00011-EN-02