Functions Of The Positioner And Process Controller Version - Burkert 3280 Operating Instructions Manual

Low power function
8.2 functions of the positioner and process controller
version
Motor valve Type 3280 and 3285 has different functions, which can be changed via the DIP switches and com-
munications software.
Functions for positioner and process controller:
function
Zero point shut-off
Interruption in the power
supply
Correction characteristic
for adapting the oper-
ating characteristic
Insensitivity range
Effective direction
Safety position
Value actuating speed
Limit of the mechanical
valve positioning range
Simulation
Analog input (set-point
value input) (analog
version only)
Analog output (actual
value output) (analog
version only)
User calibration
Energy save function
36
The motor valve has a low power function which can be adjusted (see chapter
"7.3"). When the function is switched on, the motor is supplied with lower current.
The motor then provides a lower torque; as a result the maximum permitted medium
pressure is lower. The function may be used only at very low differential pressures
from input to output (max. medium pressure 3 bar, max. differential pressure 1 bar)
The valve features a zero point shut-off which ensures sealing of the valve with
input signals below a set input signal threshold. The valve is closed when values are
below this threshold. See chapter "8.3.1"
When the power supply is interrupted, the valve remains in its respective position.
When the supply voltage is applied again, the control electronics automatically
detect its current valve position and will automatically adjust the valve position if
standard signal has changed
Use this additional function to select a transfer characteristic in relation to the set-
point value (set-point position, CMD) and the valve stroke (POS) for correcting the
flow or operating characteristic. See chapter "8.3.1"
The position controller is only activated once a defined control difference has been
achieved. See chapter "8.3.1"
Reversal of the effective direction of the set-point value. See chapter "8.3.1"
Definition of the safety position for set-point value input < 4 mA. See chapter
"8.3.1"
Input of the opening and closing time. See chapter "8.3.1"
The physical positioning range is limited to defined ranges.
Simulation of set-point values for testing device functions, see description in
chapter "8.3.1"
4...20 mA; 0...20 mA; 0...5 V; 0...10 V can be set as standard signals, see chapter
"8.3.1"
4...20 mA; 0...20 mA; 0...5 V; 0...10 V can be set as standard signals, see chapter
"8.3.1"
Changing the factory calibration of the signal input. See chapter "8.3.1"
The motor valve features a set table energy-saving function. When the energy-
saving function is switched on, less current is supplied to the motor. The motor then
provides a smaller torque, resulting in a reduced max. permissible medium pressure.
Only use the energy-saving function with very low differential pressures from On-
Closed output (max. medium pressure 3 bar, max. differential pressure 1 bar). See
chapter "8.3.1"
english
Type 3280, 3285
Start-up
Description