Badger Meter SRD/SRI Valve Positioners - Manual (Page 46)

Travel Sum Deadband
An alarm can be set based on the total amount of travel . Travel Sum Limit is the total accumulated travel, in full strokes, to
trigger an alarm . Small valve movements will be accumulated . To avoid including small continuous motion around the
setpoint to Travel Sum, a Travel Sum Dead Band is specified . The default for this 4-byte real is 1% .
Travel Sum Limit
An alarm can be set based on the total amount of travel . Travel Sum Limit is the total accumulated travel, in full strokes, to
trigger an alarm . Small valve movements will be accumulated . To avoid including small continuous motion around the
setpoint to Travel Sum, a Travel Sum Dead Band can be specified . The default for this parameter is 90,000,000 .
Control Difference Limit
The difference between the setpoint and position, defined as the Control Difference, is another variable which can be used
to setup an alarm . If this error exceeds the Control Difference Limit (%) for more than a specified time in seconds (Control
Difference Time), then an alarm will be triggered . A positioner which is not calibrated (Autostart or Endpoint Calibration not
done yet) may cause a high Control Difference . The default for this parameter is 5% . This value is displayed as percentage .
Control Difference Time
The difference between position and setpoint, defined as the Control Difference is another variable which can be used to setup
an alarm . If this error exceeds the Control Difference Limit (%) for more than a specified time in seconds (Control Difference
Time), then an alarm will be triggered . A positioner which is not calibrated (Autostart or Endpoint Calibration not done yet)
may cause a high Control Difference . The default for this parameter is 60 seconds .
Alarm Deadband
Alarms can be set in the Alarms page (Edit > Configuration) . Triggered by Position, either a warning (Low Alarm, High Alarm) or
full alarms (Low Low Alarm, High High Alarm) can be set for both lower and upper travel limits . Alarm Dead Band can be used to
specify a dead band region so that continuous switching on and off of an alarm can be avoided .
This 4-byte real, expressed as percentage . As an example, if the Low alarm is set to 8%, and this parameter is set to 1%, the
default, then if the Low Alarm has occurred, the positioner needs to move back to 9% in order for the alarm to be cleared from
the secondary status .
NOTE: N The alarm is also recorded in the historical status . Thus it is possible to check if an alarm had occurred since the last
reset of historical status .
Internal Electronics Temperature Lower Limit
This is a four byte real field that allows the user to set a minimum value for the internal electronics temperature . If the internal
temperature of the positioner is outside the Lower Temperature Limit displayed in the alarms page, an alarm will be raised .
The diagnostic bit remains set as long as the condition is valid . The default for this parameter is –20° C (– 4° F) . Operating the
positioner below this limit may cause damage to the instrument .
Internal Electronics Temperature Upper Limit
This is a four byte real field that allows the user to set a maximum value for the internal electronics temperature . If the internal
temperature of the positioner is outside the Upper Temperature Limit displayed in the alarms page, an alarm will be raised .
The diagnostic bit remains set as long as the condition is valid . The default for this parameter is 80° C (176° F) . Operating the
positioner above this limit may cause damage to the instrument and violate electrical safety conditions .
Temperature Units
This single-byte field specifies whether temperature information by the internal temperature sensor is expressed in ° C
(degrees Celsius) or ° F (degrees Fahrenheit) scales . The default is ° C . Since the internal calculations are done in ° C, it must
also be used during the temperature sensor calibration .
Configuration / Parameter
Page 46 August 2014 POS-UM-00011-EN-02