Owner's manual

5.1Setting Lower limit (”closinglimit“)
-1--- LED 1lightsup
The positionerprovidesthatINSERVICE thevalve positiondoesnot close
anyfurther than definedbythe closinglimit.Ifthe setpoint valueislower
than this limit, message12is produced.
By pressing of keys (+)or(–), thevalue is adjustedand with key( )confirmed.
Thekeys have Autorepeat: By pressingand holding of akey (+) or (–) ,the valueiscounted
upward, aftersometimeinlarger steps.
Example: Lower limit is setto2%.
5.2SettingCutofflow (”0% seal-tight point“)
--1- - LED 2lightsup
If a0%seal-tight point is given, in case thesetpoint is deviated lower(e.g.
3%), theSRD providesthe pneumatic output to press the valveintoits
seat withfullforcein order to tightlyseal valve.
As soon as thecommand value is 0.5%*higherthanthis seal-tight value,
thepositionagain follow sthe command value.
*This istthe “Seal-tight hysteresis”factory setat0.5%. Thevalue may be changed via
communication.
5.3SettingCutoffhigh(“100% seal-tight point”)
---1- LED 3lightsup
If a100%seal-tight pointispre-set and in case a certain setvalue is ex-
ceeded (e.g. 97 %),the SRD provides that the pneumatic output presses
thevalve 100% intoits seat with full force.
This function makessense for3-way valves.
Also both seal-tight points can be used in ordertotightly closethe respec-
tive shut-off pathduring partial operation.
By pressing of keys (+)or(–), thevalue is adjustedand with key( )confirmed.
Thekeys have Autorepeat: By pressingand holding of akey (+) or (–) ,the valueiscounted
upward, aftersometimeinlarger steps.
Example: Cutoff high is setto97%.
5.4Setting Upperlimit (”opening limit“)
----1 LED4lightsup
TheSRD provides that IN SERVICEthe valvepositiondoes not open any
furtherthan definedbythe opening limit. If theset valueisexceeded,
message 13 is produced.
5 Limits/Alarms
5.1 Lower limit
5.2 Cutoff low
5.3 Cutoff high
5.1 Lower limit
2.0 %
5 Limits/Alarms
5.1 Lower limit
5.2 Cutoff low
5.3 Cutoff high
5.2 Cutoff low
3.0 %
5 Limits/Alarms
5.1 Lower limit
5.2 Cutoff low
5.3 Cutoff high
5.3 Cutoff high
97.0 %
5 Limits/Alarms
5.2 Cutoff low
5.3 Cutoff high
5.4 Upper limit
Definitions
Stroke, stroke range of the membrane actuatorisdefined for rotary actuatoras angle, angle range.
0%position is the mechanical impact at actually closed valve (caution if using handwheel and mechanically adjust-
able stroke limitation!)
100%position is the mechanical impact at actually open valve.
Closing limit is alower limit set via software. In normal operationthe valve will not close more than set here.
Attention: In the event of failure of theauxiliary energynocontrolling is possible, thereforethe springs in
the actuator will move thevalve intosafety position(forsingle-acting actuator).
Opening limit is aupper limit set viasoftware.Innormal operationthe valve will not closemorethan set here.
Attention: In the event of failure of theauxiliary energynocontrolling is possible, thereforethe springs in
the actuator will move the valve intosafety position(forsingle-acting actuator).
Normal operation (= IN SERVICE) means that the positionis controlled to the4–20 mA input signal.
Page 42
Startup
August 2014POS-UM-00009-EN-02