Badger Meter SRD/SRI Valve Positioners - Manual (Page 42)

5.1 Setting Lower limit (”closing limit“)
- 1 - - - LED 1 lights up
The positioner provides that IN SERVICE the valve position does not close
any further than defined by the closing limit. If the setpoint value is lower
than this limit, message 12 is produced.
By pressing of keys ( +) or (–), the value is adjusted and with key ( ) confirmed.
The keys have Autorepeat: By pressing and holding of a key (+) or (–) , the value is counted
upward, after some time in larger steps.
Example: Lower limit is set to 2 %.
5.2 Setting Cutoff low (”0% seal-tight point“)
- - 1 - - LED 2 lights up
If a 0% seal-tight point is given, in case the setpoint is deviated lower (e.g.
3 %), the SRD provides the pneumatic output to press the valve into its
seat with full force in order to tightly seal valve.
As soon as the command value is 0.5%* higher than this seal-tight value,
the position again follows the command value.
* This ist the “Seal-tight hysteresis” factory set at 0.5%. The value may be changed via
communication.
5.3 Setting Cutoff high (“100% seal-tight point”)
- - - 1 - LED 3 lights up
If a 100% seal-tight point is pre-set and in case a certain set value is ex-
ceeded (e.g. 97 %), the SRD provides that the pneumatic output presses
the valve 100% into its seat with full force.
This function makes sense for 3-way valves.
Also both seal-tight points can be used in order to tightly close the respec-
tive shut-off path during partial operation.
By pressing of keys ( +) or (–), the value is adjusted and with key ( ) confirmed.
The keys have Autorepeat: By pressing and holding of a key (+) or (–) , the value is counted
upward, after some time in larger steps.
Example: Cutoff high is set to 97 %.
5.4 Setting Upper limit (”opening limit“)
- - - - 1 LED 4 lights up
The SRD provides that IN SERVICE the valve position does not open any
further than defined by the opening limit. If the set value is exceeded,
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 actuator is defined for rotary actuator as 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 a lower limit set via software. In normal operation the valve will not close more than set here.
Attention: In the event of failure of the auxiliary energy no controlling is possible, therefore the springs in
the actuator will move the valve into safety position (for single-acting actuator).
Opening limit is a upper limit set via software. In normal operation the valve will not close more than set here.
Attention: In the event of failure of the auxiliary energy no controlling is possible, therefore the springs in
the actuator will move the valve into safety position (for single-acting actuator).
Normal operation (= IN SERVICE) means that the position is controlled to the 4–20 mA input signal.
Page 42
Startup
August 2014 POS-UM-00009-EN-02