LEWA smart control Intelligent metering flow controls

for process technology

accurate & reliable

intelligent & dynamic

modular & flexible

Neue Screen einbauen

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LEWA offers a controller for the optimum monitoring of metering systems – the LEWA smart controlThe software makes it possible to save the characteristic curve of the LEWA pump with your allowable error bandwidth and adjusting range. The programmed learning function, i.e. the adaptive control, ensures a fast adjustment of the actual value without considerable settling time compared to conventional PID con-trollers. The actuating variable for the metering pump (motor speed and/or stroke length) and the measurement signal from the flow meter are per-manently checked for plausibility.

Integrated diagnostic functions dis-play deviations and malfunctions. The causes can thus be detected effi-ciently, which secures a high system availability. Even wear on the meter-ing pump is detected by the intelli-gent controller.

The developer team integrated LEWA’s expertise, that has been gath-ered over several decades and from a wide variety of industries.

In its basic design, the LEWA smart control regulates one metering line. The integration of frequency converter and external communication is done by an analog connection.

The following expansions are available: Upgrade to bus communication (e.g., Profibus, Profinet)

Larger touch panel (optional for use in potentially explosive zones I and II, too)

Modular expansions to a second metering line and/or to electrical stroke adjustment to extend the adjusting range

Monitoring of other parameters (e.g., level, conductivity) via addi-tional sensors

LEWA smart control is…

flexibleBy means of up to four actuators the controller regulates one or even two closed control loops. This allows the operator to control a redundant sys-tem or two completely independent metering systems with a single con-troller.

universalMetering pumps and measuring sys-tems of almost any type can be used. informative

Via a 6” touch panel the operator can select from various screens and over-views (desired/actual value, graphical display, etc.)

easy to install and operator friendly

Easy start-up due to factory-provided pre-parameterization. The controller can be operated directly via the touch panel in your preferred language.

Due to the saved characteristic curve of the LEWA pump, LEWA smart control ensures a fast adjustment to the desired value within the shortest possible time

LEWA smart control: The compact controller for multiple applications

desiredvalue

actuator(motor/stroke adjustment)

metering pump flow meter (FIT)

flow meter adjusting signal

programmableerror gap width

adjusting value (speed/stroke length)

actual valuem

eter

ed fl

ow

V (

m)

LEWA smart control

pump curve

V (m)

With LEWA smart control the adjustment of the actual value at process start-up reaches a maximum deviation of about +/- 1% after 30 seconds already

1209060300

Comparison: control behaviour of PID controllers to LEWA smart control

actual valuesmart control

actual value PID controller

desired value

time [sec]

actu

al v

alue

met

ered

flow

input of desired value

System screen pump:selection of operating mode

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Fluid metering in practice

Examples where the operator gets maximum benefit from LEWA smart control:

Controlling the metering flow: If the process requires to maintain a continuous mass or volumetric flow, this flow has to be controlled flexibly and reliably, for example by injecting blowing agents during extrusion pro-cesses. Here, the speed of the extruder is the guide value for the dia-phragm metering pump. Using LEWA smart control, the blowing agent can be added proportionally to the extruder speed into the plastic melt.

Batch metering: This case occurs in all filling or refilling processes, for example if an adjustable metering volume in a tank must be tracked by level. This regulation type is also used if a reactor needs a specific quantity of a chemical agent metered accord-ing to a recipe. LEWA smart control masters this task with ease.

Manual metering is frequently encountered in practice – here, the speed of the metering flow can be adjusted manually with LEWA smart control. Metering can be started and stopped as required.

Mixing processes (such as dilution of caustic soda) are the most fre-quent use of metering systems in the processing industry. In these applica-tions, LEWA smart control handles the adjustment of two metering flows in the correct ratio.

Variant 2: two pumps, two electric stroke adjustments

Variant 1: basic versionminimum design, one pump, without electric stroke adjustment

M

smart control

P1

Mmotor M EHV

motor EHVM M

P2FIT

FIT

M

P1

motor

smart control

FIT

© D7-830 en · 05.2012 · Subject to change without notice · Layout and origin: Germany

www.lewa.com

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Customized solutions for metering and process technology

For more than 50 years, LEWA has set the technical trends of metering pumps and systems. LEWA offers a single-source solution to handling complex metering and mixing tasks – ranging from individual pump con-figuration, basic and detailed system engineering and pretesting to onsite commissioning and maintenance services. Good causes to rely on:

A solution for your special application: from process analysis to global service

Highest process safety: individual pump configuration and state-of-the-art design

I nternational engineering and project competencies

Highest reliability: developed for continuous operation

Low lifetime costs: reduced energy consumption and low-wear design

Compliance with international standards, e.g. API, ASME, GOST-R, FDA, EHEDG, 3A, TÜV

Comprehensive reference list

Areas of expertise: Your local representative:

LEWA proven services and technologies

Germany / Headquarters LEWA GmbH

Ulmer Str. 1071229 LeonbergPhone +49 7152 14 - 0Fax +49 7152 14 -1303lewa@lewa.dewww.lewa.de

Japan / Headquarters Nikkiso Co. Ltd.

Yebisu Garden Place Tower 22nd Floor20-3, Ebisu 4-Chome, Shibuya-ku Tokyo 150-6022Phone +81 3 3443 - 3711 Fax +81 3 3473 - 4963 www.nikkiso.com Contacts of LEWA‘s numerous affiliated companies and

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