1067
POSITIONER TYPE 1067
E-29-
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. 29). This „protects“ the servo valve.
Fig. 29 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. 30 Closed tight function
programable from 0,0 to 10,0%
programable 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. 30).
Setting range:
0.0 ... 10.0% (applies both for complete exhausting as well as for complete air supply, see Fig. 30).
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