Positioner with Fieldbus
Foxboro Eckardt introduces the fieldbus-positioners SRD991 with PROFIBUS-PA and FOUNDATION
Fieldbus H1 in the positioner series. This series offers with the
new fieldbus-versions devices, with the choice of all in the
process automation applied communication protocols. This includes
versions with analog setpoint (4...20 mA), HART- or
FoxCom-protocol. Conversion to any other electronic can easily be
achieved by the modular structure of the electronic.
The SRD991 offers the enhanced functionality of
most modern microprocessor controlled valve-controls, e.g.
automatic initialization for determination of mechanical stops,
control parameters, and dynamic optimization of the control
behavior. This results in a remarkable reduction of expenditure
for the adjustments and the start-up. The device is operated from
control systems, controllers or PC-based configuration- and
operation-tools. All important valve data such as setpoint, valve
position, control deviation, air supply pressure, and output
pressure are shown as device data and the curve is shown in a
graphical display. The positioner can also be operated and
configured by means of local push buttons and LED’s.
Status messages submit information on current
and historic operating conditions, for example air supply failure
or remaining control deviation. This information is supplemented
by diagnostic messages furnishing additional information on the
electronic components. This enables constant monitoring of the
control process. The indicated and illustrated data as well as
status- and diagnostic messages derived can be ideally utilized
for process optimization and predictive maintenance. This results
in a more transparent and simultaneously more economic control
process thanks to fast localization of possible operational
faults. Failure times and service costs can therefore be reduced.
With this series an easy and reasonable
attachment to linear- and rotary actuators can be achieved with
only one device version. Additional options are binary inputs,
outputs, analog position feedback, built-in pressure sensors and
inductive limit switches.
A minimum pressurization of the housing
ensures, that aggressive environmental influences and dust cannot
penetrate into the housing. Possible contents of moisture in the
housing is continuously rinsed out of the housing.
More than 1 Mio. installed positioners within
40 years are an indication for the competence of Foxboro Eckardt
in the field of valve control.
Features:
- Stroke range up to 120 mm and angle ranges up to 95°
- Single- and doubleacting
- Protection class IP65 and NEMA 4X
- Self diagnostic, Status-and diagnostic-messages
- Attachment kits for all most common valves and actuators