Burkert Type 1067 - Manual (Page 83)

POSITIONER 1067
E-31-
4 OPERATION
DEADBND (factory setting : DBD = 0.5%): Deadband around the system deviation
The DEADBND additional function enables the response of the actuator to occur only after a specific
system deviation [DBD] (Fig. 32). This „protects“ the servo valve.
Fig. 32 Deadband DBD
Control
difference
Set position
Actual position
To the controller
Rangeability:
Maximum 5% relative to the stroke range.
The bottom limit is determined by AUTOTUNE.
CLTIGHT (factory setting: CLT = 0.5%): Closed tight function.
The closed tight function ensures that the valve is tightly closed outside the control range.
Fig. 33 Closed tight function
programmable from 0,0 to 10,0%
programmable from 90,0 to 100%
Plug travel (%)
Set position (%)
CLT : Closed tight threshold
Specification of a value (%) from which the actuator air is completely exhausted (at 0%) or supplied
with air (at 100%). The opening or resumption of the control operation takes place with a hysteresis of
1% (refer to Fig. 33).
Setting range:
0.0 ... 10.0% (applies both for complete exhausting as well as for complete air supply, see Fig. 33).