Gemu 1435 ePos - Setting the Dead Zone

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1435 e Pos
0
80
60
40
20
100
100
80
60
40
20
Physical
stroke
x [%]
Unlimited stroke
Limited stroke
Set value w [%]
Max
Pos
Min
Pos
The mechanical regulating distance (from limit stop to limit stop) is limited to the set values with the parameters MIN
POS and MAX POS. That way the actuator's mechanical positioning range range can be limited.
The parameter setting CLOSETIGHT is higher ranking!
CloseTight:
'Close tight' variables
With this function the valve can be moved into the seat using the maximum possible actuating force (spring force). The close tight
function can be activated for one end or both end positions. CLOSE TIGHT becomes eff ective when the set value falls below
0.5 % or exceeds 99.5 %.
The switch back hysteresis is 1 %.
0
98,5
1,5
0,5
99,5
100
100
80
60
40
20
Hub x [%]
Sollwert w [%]
Stroke x [%]
Set value w [%]
11.3.2 Setting the dead zone
DeadBand:
Positioner's dead band
The dead band shows the maximum permissible system deviation between actual value and set value.
During initialisation, on DeadBand = Auto the dead band is matched to the requirements of the control circuit. In the other discrete
settings the fi xed value for the dead band is used.
The height of the system deviation should always correspond to the requirements of the valve and the control circuit.
It is recommended that you do not set a value of < 1.0% since this could (especially for actuators with discontinuous
movement profiles) cause oscillating control characteristics. This could put a great deal of stress on the internal pilot
valves and cause them to reach the end of their service life more quickly.
Basically: the smaller the fixed value, the higher the wear and the shorter the service life. Therefore, the value should
be set only as accurate as needed.