Burkert 3280 - Page 40

40
Start-up
Type 3280, 3285
SAFEPOS when using the energy pack module (capacitive buffer module ID 773 440)
Entry of the safety position
To be able to approach a valve safety position in the event of a power failure, the valve must be energized via the
capacitive buffer module. In the event of a power failure, the buffer module provides an output voltage of 18 V DC
for several seconds. The reduced input voltage is detected by the valve and the safety position is approached
accordingly. It is possible to move the actuator into any position or to pause it in the current position. This
Safepos function has the highest priority.
SAFEPOS when standard signal < 4 mA
Entry of the safety position
At a set-point value input of 4...20 mA, you can input how the actuator is to behave if the input signal drops below
4 mA (signal fault detection). It is possible to move the actuator to the respective end positions or to pause it in
the current position.
X.LIMIT
Limits the mechanical valve positioning range
This function limits the (physical) stroke to specified % values (lower and upper). In doing so, the stroke range of
the limited stroke is set equal to 100 %. If the limited stroke range is left during operation, negative actual position
or actual position greater than 100 % are indicated.
Factory setting: Lower position limit = 0 %, Upper position limit = 100 %
Adjustment range:
Lower position limit: 0...20 % of the total stroke
Upper position limit: 80...100 % of the total stroke
Limited
stroke
Unlimited stroke
Physical
stroke
(%)
Limited
stroke (%)
Set-point value [mA](INPUT)
Figure 23: Diaphragm X.LIMIT
CUTOFF
Sealing function for position controller / process controller
This function causes the valve to be sealed outside the control area. Enter the limits for the position set-point
value (CMD) or process set-point value after which the actuator is closed fully.
CHARACT
Select the transfer characteristic between input signal (position set-point value) and stroke (correction
characteristic)
Use this auxiliary function to select a transfer characteristic with reference to set-point value (nominal position, CMD)
and valve position (POS) for correction of the flow-rate or operating characteristic.
english