Drives for Water Industry - Industria de Siemens

Innovative technology 

for the highest availability 

and cost-effectiveness 

Drives for Water Industry 

Answers for industry.

No compromises when it comes to 

supplying water with the highest quality 

In the water industry, topmost priority is given to achieving the optimum water quality and an absolutely 

reliable supply. At the same time, ever-increasing cost pressure demands water plants with the highest 

degree of cost-effectiveness. As a consequence, the technology used must operate reliably, efficiently 

and with a high degree of precision. 

The demands placed on the drive technology are especially high. Drives play a key role when it comes to 

supply reliability and plant efficiency. Pump drives maintain the water pressure at the right level around 

the clock, always adapt the pumped quantity to the actual demand and regulate, where required, the 

mixing ratio. Further, their energy demand is the most significant element of the overall energy costs. 

With this as background, drive converters offer enormous cost-saving potential: The precise and continuous 

closed-loop speed control ensures that the drive runs at the optimum operating point – and 

that energy costs can be significantly reduced. 

2

First-class solutions for all tasks 

Whether small distribution pumps, blower 

compressors in water treatment plants or 

multi-Megawatt drives in large main pumping 

stations. As partner to the water industry, 

Siemens offers a unique and extensive 

range of products and systems that addresses 

all of the sector-specific drive applications 

encountered in the water industry. 

With our solutions we consequentially ensure 

the highest reliability and efficiency. 

We offer individual components as well as 

products and systems that are perfectly 

harmonized and coordinated with one 

another; these are based on proven standards 

and tailored solutions – from a single 

source. Our portfolio includes motors and 

drive converters with a power rating of a 

few Watts up into the high double-digit 

Megawatt range, low-voltage drives as 

well as medium-voltage drives. 

Perfectly tailored to the 

requirements of the sector 

Our motors and converters ensure optimum 

pumping – with the maximum degree 

of availability and with minimum 

operating costs. In fact, these advantages 

can be further expanded if our drive components 

work together as a system. This 

is because we develop and manufacture 

our motors and drive converters right 

next to another, we perfectly harmonize 

them and subject them to a grueling test 

under real operating conditions in one of 

our state-of-the-art system test facilities. 

The result: Drive systems that distinguish 

themselves as a result of the highest 

degree of availability and maximum 

efficiency. 

Typical applications 

In water supply 

• Retrieving drinking water 

• Transporting water 

• Dosing 

• Treating drinking water 

• Distributing water 

• Irrigation systems 

In wastewater 

• Transporting wastewater 

• Transporting sludge 

• Aerating and mixing the 

activated sludge 

• Centrifuges 

• Equipment in wastewater handling 

such as rakes etc. 

3

The key to the highest supply availability: 

Reliability in continuous use 

A water supply must be guaranteed 

around the clock. This is the reason 

that in many applications the name 

of the game is reliable long-term and 

continuous use. Put in another way: 

Absolute fault-free operation is mandatory 

– the same goes for the highest 

efficiency. This is because the energy 

costs are especially important for 

motors that continually run. 

The complete bandwidth of motors 

Our motors set standards when it comes 

to reliability and efficiency. Our portfolio 

extends from standard motors for pumping 

stations up to special submersible 

pump motors with degree of protection 

IP68. We also offer explosion-protected 

motors e.g. for the settling process. They 

have a flameproof enclosure and on the 

pump side they have a rotating axial seal. 

Our portfolio includes motors with every 

possible conceivable cooling type and degree 

of protection to comply with almost 

any specification – such as pump motors 

with locating bearings on the drive side 

and integrated PTC thermistors – as well 

as high-power torque motors. These gearless 

permanent-magnet synchronous motors 

are especially reliable, require little 

maintenance but have an extremely high 

efficiency. They are especially suitable for 

slow-running pumps. 

Rugged with a long service life 

Our motors distinguish themselves as a 

result of their rugged mechanical design, 

long lifetime as well as low maintenance 

and reliable operation. Enclosures, bearings, 

active parts, ventilation and cooling 

system are perfectly harmonized with 

one another. Innovative insulation systems 

in conjunction with the VPI technique 

ensure a high voltage strength 

when either connected directly to the 

line supply or fed from a drive converter. 

These insulation systems also result in 

stiff winding overhangs and excellent corona 

protection for maximum switching 

and reversing strength. Our motors play a 

decisive role in achieving a higher degree 

of plant availability and a more reliable 

water supply. 

Additional advantages: 

• High mechanical strength and 

thermal endurance 

• Extremely long lifetime and 

low-maintenance bearings 

4

• The vibration quality surpasses 

stringent IEC and NEMA standards 

• Innovative cooling systems for uniform 

cooling and minimizing the thermal load 

• Enclosure that is resistant to shocks 

and vibration and with a high 

vibrational stiffness 

• Corrosion protection for humid and 

aggressive environments 

Highest power in the smallest space 

Our motors are unbeatable when it comes 

to envelope dimensions and weight at 

any power rating. This means that they 

require significantly less space and can be 

simply integrated into a complete plant. 

Further, they are also extremely quiet – 

additional noise-reducing measures are 

not required. 

Significantly lower maintenance costs 

As a result of their service-friendly design, 

our motors distinguish themselves due to 

the extremely long maintenance intervals. 

Further, the high efficiencies improve the 

energy consumption therefore reducing 

operating costs. We offer energy-saving 

motors in the “High Efficiency” version for 

the range up to 200 kW – that is especially 

efficiency-sensitive. Up to 90 kW, these 

motors are designated as efficiency class 

EFF1. When compared to conventional 

motors, they have losses up to 40% less – 

which often means that they have a payback 

time of just a few months. 

Energy-saving motors 

The best example for cost-saving, efficiency 

and environmental friendliness: 

Our energy-saving motors that require 

less energy for the same power output. 

In fact, this can even be proven with the 

appropriate calculations using SinaSave®. 

This is a software tool that we developed, 

which allows you to calculate the payback 

time of your investment. 

The advantages – an overview: 

• Complete product range according to 

EU/CEMEP, EPAct and NEMA 

• Simple motor selection using an efficiency 

classification system (EFF1/EFF2) 

• 1LE1, 1LA9 and 1LG6 motors fulfill both 

EFF1 as well also EPAct efficiencies 

• Lower operating costs as a result of the 

high EFF1 efficiency 

• High motor and lubricant lifetime 

thanks to the lower motor temperature 

for EFF1, EPAct and NEMA motors 

• CO 2 reduction in operation reduces the 

environmental impact 

Geared motors: Concentrated power, 

compact design 

Our MOTOX series of geared motors have 

output torques up to 20,000 Nm and higher 

rated gear unit torques than conventional 

geared motors but with the same envelope 

dimensions. All gear unit types are available 

in the power range from 0.09 kW to 200 kW – 

from helical through offset shaft, helical 

bevel and helical worm up to worm geared 

motors. 

They are admirably suited for applications 

such as longitudinal and rotary scrapers, 

rakes, mixers or spiral conveyers. 

5

A farsighted investment: 

Drive converters for 

variable-speed operation 

Flow rates can be controlled far more precisely and faster with variable-speed drive 

systems than when using mechanical control concepts – and can be adapted to the 

actual demand. The advantage: A significantly higher degree of reliability and quality 

for water and wastewater systems. Further, variable-speed operation opens up 

enormous cost-saving potential. This is the reason that a drive converter often has 

a payback time of just a few months. 

6

The clever alternative to fixed speeds 

For conventional control techniques, the 

motors always run with the speed required 

for the maximum flow rate. Excessive flow 

rates are mechanically “throttled” – which 

means that energy is simply thermally dissipated. 

Contrary to this, state-of-the-art drive 

systems with drive converters precisely adapt 

the speed – and therefore the energy drawn – 

to the actually required flow rate. The motor 

therefore only draws the actually required 

power. Power factor and efficiency remain 

almost constant. This avoids over-dimensioning 

the motor and the energy requirement 

is significantly reduced. The cost-savings are 

especially high for positive displacement 

machines – such as pumps or blower compressors 

and depending on the plant characteristic, 

can be up to 50%, even up to 70% 

in extreme cases . 

Low-stress operation reduces 

maintenance costs 

The starting characteristics of a variable-speed 

drive also have a positive impact: Only the rated 

current is drawn, which means that current 

peaks – that typically occur when starting – 

are eliminated along with the associated high 

torque surges. The soft starting and stopping 

reduces the stress on the complete mechanical 

drive transmission line. Further, operating 

conditions that can damage the machine or 

system – such as cavitation, the inclusion of 

gas, compression surges and vibration – can 

be eliminated. By slightly adapting the motor 

speed, cavitation bubbles that damage the 

pump impeller blades can be eliminated and 

continuous streams of gas being pumped 

along with the medium are avoided. Not only 

this – ultrasonic compression surges typical 

for compressors are also eliminated. Suppressing 

certain pump speeds also avoids undesirable 

vibration and oscillation. Additional advantages 

include: Mechanical control elements 

are eliminated, the power factor is improved 

and the process control optimized when 

compared to mechanical control techniques. 

The complete range of drive converters 

We supply the ideal drive converter for every 

application and every motor. As a result of 

their modular design and wide range of available 

components and options these drive units 

can be optimally adapted to the specific application 

requirements and be combined to form 

perfectly harmonized, reliable and highly-efficient 

systems. The drive units are designed so 

that their energy-saving potential can be especially 

effectively utilized. With their rugged 

closed-loop vector control that does not require 

an encoder they are specifically tailored 

to drive tasks without regenerative feedback 

into the line supply – this makes them ideal for 

applications in the water industry. 

7

SINAMICS: The unified and 

integrated drive family 

With SINAMICS, Siemens is offering an innovative family of drives that sets 

standards in every perspective. In addition to a standard and simple operator 

control philosophy, the members of the SINAMICS family all use the SIZER 

engineering tool for selecting and dimensioning as well as STARTER for commissioning 

and diagnostics. The following drive units are precisely predestined 

for the water industry: SINAMICS G120, G130, G150, GM150 and GL150. And 

for especially stringent requirements on the line supply quality, the S series 

with SINAMICS S150 or S120. 

8 

Simple to operate 

Whether low voltage or medium voltage: 

All of the SINAMICS cabinet units are 

equipped with the user-friendly AOP 30 

operator panel that displays simple operator 

control and commissioning functions 

in plain text. This means that no additional 

manuals are required when commissioning 

the drives. Drive parameters such 

as current, actual speed and speed set 

point are displayed in operation using 

bar-type displays. 

Numerous interfaces and highest availability 

SINAMICS drives are equipped with 

numerous interfaces: 

PROFIBUS, PROFINET and various analog 

and digital inputs and outputs. This ensures 

that the drive units can be easily 

integrated into higher-level automation 

systems. All SINAMICS drive units distinguish 

themselves as a result of their highest 

degree of availability. Their simple, 

clearly structured design makes them 

rugged and reliable. When service is required, 

modules can be replaced with just 

a few manual operations – special tools 

are not required. Further, intelligent 

maintenance functions can be integrated, 

e.g. in the medium-voltage

SINAMICS GM150 drive converters that 

automatically issue a signal if maintenance 

is required. Service and maintenance 

work can always be optimally 

planned. This means that unpredictable 

and sudden pump failures are a thing of 

the past – which also goes for the resulting 

supply bottlenecks. 

Space-saving and quiet 

Our drive converter cabinets have a footprint 

that is up to 70% less than conventional 

units thanks to their exceptional 

compactness. This means that electrical 

rooms can be dimensioned significantly 

smaller – which has a positive impact on 

the costs. Integration into existing plants 

and systems is also simplified. Our drive 

converters are the first choice when it 

comes to low noise: Only 69 db(A) at full 

load – even for cabinet units with power 

ratings of several 100 kW, additional 

noise-reducing measures are simply not 

required. 

First choice for pump drives 

• Rounding-off times avoid overpressure 

conditions and water hammer therefore 

reducing the level of stress on the 

hydraulic and mechanical systems 

• To ensure safe, reliable operation, 

mechanical resonance frequencies are 

skipped, locked rotors are detected and 

loads monitored 

• The efficiency is optimized for no-load 

operation; the flux set point of the control 

is adapted depending on the load. Under 

no-load conditions, this reduces the rated 

motor flux by up to 50% and saves the 

corresponding amount of energy 

• Operation can be monitored online 

It is being increasingly specified that 

pumps must also be disconnected from 

the line supply in a controlled fashion if 

the flow rate is to be reduced. This is 

mainly done to avoid oscillations in the 

hydraulic system. 

Bypass function: Using this function integrated 

in the drive converter, a pump motor 

can be connected to the line supply – 

either when a specific speed is reached 

or using a separate command with a contactor. 

There are two versions of this bypass 

circuit: Without (cold synchronization) 

or where the motor is synchronized 

to the line supply (hot synchronization). 

This means that the drive converter can 

be used as starting and stopping converter 

and staging functionality can be more 

simply implemented. The staging function 

permits a drive converter to be used to 

feed several motors and pumps – the perfect 

solution especially when it comes to 

pumping large quantities of water. A typical 

example of such an application: The 

drive converter starts the first pump and 

monitors its speed. As the rate of flow 

increases this pump drive is synchronized 

and connected to the line supply. The 

same drive converter is then used to start 

a second pump – that is then used to precisely 

control the flow rate. This means 

that pumps are not directly connected 

to the line supply (direct start) therefore 

avoiding undesirable high starting currents. 

With this constellation, theoretically, 

an unlimited number of pumps can be 

monitored using just one drive converter. 

Flying restart function: This function is 

used to connect a drive converter to a motor 

that is still running. If the drive converter 

was to be powered up without this 

function, then the motor would not be 

able to establish its flux. This could cause 

the drive system to trip due to an overcurrent 

condition. The flying restart function 

first determines the motor speed. 

Technology controller: The technology 

controller integrated as standard controls 

process quantities such as pressure, 

quantity, temperature, level. 

9

Customized SINAMICS functions 

Specific pump functions 

A whole raft of functions – that have 

been specifically designed for pumps – 

can be implemented using a software 

macro. This simplifies the operator control 

and parameterization of the drive 

converter. The pumps functions are 

already pre configured. 

EnergySaving: If the motor is not required 

it can be completely shut down using this 

function. This is done automatically if the 

system deviation of the technology controller 

lies below a defined limit value for a 

time that can be parameterized. 

EnhancedEnergySaving: This function 

can be used to extend the time for which 

the drive converter is powered down as a 

result of the EnergySaving function – in 

order to save more energy and to avoid 

unnecessarily starting and stopping the 

pumps. And an additional spin-off – the 

pipes are also purged. 

MaintenanceCleaning: A constant flow 

rate means that suspended particles in the 

liquids being pumped can be deposited 

over time. This can reduce the effective 

pipe diameter or even block the pumps. 

The MaintenanceCleaning function is used 

to briefly increase the pump speed to 

counteract this sediment build-up. 

WallDepositsPrevention: If tank levels 

are kept constant over a longer period 

of time in wastewater treatment systems 

deposits occur at the edge of the tank. To 

avoid these deposits, the WallDeposits- 

Prevention function always varies the set 

point for the technology controller so that 

the tank level is permanently raised and 

lowered. 

10

Additional SINAMICS functionalities 

for the water industry 

MICROMASTER low-voltage converters 

The MICROMASTER family of drive converters 

addresses drive applications in the 

power range from 0.12 kW to 250 kW 

and distinguishes itself as a result of the 

extremely easy handling – from installation 

& mounting through commissioning 

up to operation. These drive units are 

suitable for pump drives up to 250 kW 

and can control up to three motors. They 

are equipped with an integrated dry running 

protection for pump drives – as well 

as additional features for specific applications 

that can be implemented using 

freely assignable function blocks. 

Medium-voltage drive converter: 

ROBICON Perfect Harmony 

ROBICON Perfect Harmony rounds off our 

drive portfolio in the medium-voltage level. 

It is the undisputed No. 1 worldwide 

in medium-voltage drive converters regarding 

both market share as well as installed 

power. With this drive unit, lowvoltage 

cells are connected in series so 

that a medium-voltage drive converter is 

created that can be extremely precisely 

scaled – over a wide voltage and power 

range. Presently, this drive unit is considered 

to be the most compact mediumvoltage 

drive converter in the market: 

Transformer, power unit and control are 

combined in one unit. The complete 

system can be commissioned in a plug 

& play fashion without requiring any 

assembly work on-site. 

The extremely high voltage quality avoids 

losses due to harmonics, reduces the level 

of stress both on the line supply and 

the motor and also fulfills the most stringent 

regulations relating to harmonics. 

The proven core topology ensures the 

highest degree of compactness, voltage 

quality and availability. The innovative 

cell-bypass concept in conjunction with 

the process-tolerant ProToPS® protective 

system guarantees the highest degree of 

reliability. This is because even if a cell 

fails, the drive still remains operational as 

the defective cell is simply bypassed. If a 

fault develops, instead of simply powering 

down the drive, ProToPS® provides a 

graduated system of alarms. This means 

that operating companies have more 

time to appropriately respond and take 

suitable countermeasures. 

11

Best-practice 

water supply examples 

Baden-Württemberg state water supply 

Task 

The Baden-Württemberg state water supply 

was to be modernized – with the objective 

to increase flexibility and efficiently use the 

groundwater reservoirs. This involves one of 

the largest long-distance water supply utilities 

in Germany: More than three million 

people are supplied with drinking water 

through an extensive network of pipes 

770 km long. This is for an area that in addition 

to Stuttgart also includes Aalen, Esslingen, 

Göppingen, Ludwigsburg, Schwäbisch 

Gmünd and Ulm. 

Solution 

The groundwater reservoirs were equipped 

with variable-speed low-voltage drive systems 

for the pumps. The extremely precise 

and flexible drive concept always guarantees 

the correct mixing ratio – and therefore the 

optimum drinking water quality. It also ensures 

the maximum availability and reliability 

of the water supply. The variable-speed 

operation simultaneously saves energy and 

reduces the level of stress on the system. 

Schwetzinger Hardt waterworks 

Task 

A higher degree of safety, reliability and 

cost-effectiveness. This is what the City of 

Mannheim expected when it came to modernizing 

their water supply. This was to be 

done based on innovative operating control 

methods with process visualization and remote 

access. 

Solution 

The drinking water pumping stations were 

equipped with variable-speed low-voltage 

drive systems – for precise, reliable energysaving 

operation that also reduced the 

stress on the system. The drive system is 

integrated in a SIMATIC WinCC-based supervisory 

control system. This means that it 

can be operated and monitored from everywhere 

– also via remote access. 

Products used: 

• N-compact low-voltage motors 

• SINAMICS G150 drive converters 


• 1LG6 low-voltage motors 

• SINAMICS G150 drive converters 

12

Madrid water supply 

Task 

The Spanish capital wanted to guarantee a 

safe, reliable and cost-effective water supply 

for approximately one million people living in 

the southern part of the city. This represents 

approximately 250 liters per day for each person 

– also during the dry summer period. 

Solution 

The main drinking water pumping stations 

were equipped with variable-speed, medium-voltage 

drive systems in order to secure 

precise and flexible usage of the water reserves. 

The existing motors were only partially 

replaced. Those in a good condition 

were upgraded for variable-speed operation. 

The flow rate can now be quickly and precisely 

adapted to the actual water demand 

using the motor speed. Further, variablespeed 

operation reduces the level of stress 

on the mechanical system of the complete 

pumping station – and when compared to 

conventional control concepts – now allows 

double-digit energy savings to be realized. 


• H-compact PLUS high-voltage motors 

• Liquid-cooled SINAMICS GM150 

medium-voltage drive converters 

Jakarta water supply 

Task 

The pumping stations were to be retrofitted 

in order to secure reliable and cost-effective 

water supply for the ever-growing metropolis 

of Jakarta with its population of millions. 

The existing motors, switchgear technology 

and cabling were to be kept. 

Solution 

With the modernization, the existing technology 

was kept in operation (motors, cabling, 

switchgear and instrumentation). 

However, low-voltage and medium-voltage 

drive converters were integrated into the 

existing system. Further, additional components 

from Siemens ensure safe and absolutely 

reliable operation. These components 

include an incoming contactor, main control 

switch with fuses to protect the semiconductors 

as well as a line reactor to limit 

harmonics. 


• SINAMICS G150 drive converter 

• Medium-voltage drive converter 

(previous SINAMICS GM150 series) 

13

Best-practice water 

treatment examples 

Basel water treatment 

Task 

The energy usage was to be further reduced 

for one of the largest wastewater treatment 

plants in Switzerland located close to Basel. 

The existing motors were to be replaced by 

motors with especially high efficiencies. 

Solution 

450 kW high-efficiency low-voltage motors 

are now used to drive large Archimedes 

screw-type pumps that are used to transport 

the incoming wastewater into the treatment 

system located approximately 10 meters 

higher. Thanks to their special bearings they 

can handle the high cantilever forces. In the 

especially efficiency-sensitive power range 

below 200 kW, energy-saving motors with 

the highest efficiency Class EFF1 are used – 

especially there where the wastewater is 

transported into the biological stage of the 

settling plant after mechanical precleaning. 

From here, the water flows just by gravity 

into the postsettling basins. The activated 

sludge comprising bacteria and microbes 

settles out. Part of the sludge is returned to 

the biological stage using so-called return 

sludge pumps. Energy-saving motors are 

also used here. Calculations have shown 

that the payback time of the energy-saving 

motors is a maximum of three years. 


• N-compact low-voltage motors 

• 1LA9, 1LE1 and 1LG6 EFF1 

energy-saving motors 

14

Overview of motors for the 

water industry 

Low-voltage motors 

Induction 

Aluminum frame 


Induction 

Gray cast-iron 

frame 


Synchronous 

High-Torque 

gearless 

High-voltage motors 

Induction 

High-voltage motors 

Synchronous 

Power range 

in kW 

Power range 

in kW 

Voltage classes 

in V 

0.06 – 45 0.75 – 4,000 Up to 2,150 200 – 30,000 5,000 – 100,000 

230 – 690 230 – 690 400, 460, 690 2,000 – 13,200 6,000 – 13,200 

Voltage classes 

in V 

Cooling type 

Shaft heights 

in mm 

56M – 225M 100L – 630 400, 450, 500 315 – 1,250 710 – 1,250 

Pole No. 2 – 8 2 – 8 16 2 – 16 2 – 8 

Degree of 

protection 

Speed in rpm 750 – 6,000 750 – 6,000 Up to 800 Up to 15,000 Up to 6,300 

Degree of protection IP55, IP56, IP65 IP55, IP56, IP65 IP55 IP23, IP55 IP55 

Cooling concept Rib-cooled Rib-cooled 

Air/air heat 

exchanger; 

Air/water heat 

exchanger; 

Open-circuit aircooled 

Rib-cooled, 

water-jacket cooling 

Rib-cooled 

Air/air heat 

exchanger; 


exchanger; 


Air/air heat 

exchanger; 


exchanger; 


Motors 

Converter-side 

system partner 

SINAMICS G120 

MICROMASTER 

SINAMICS G120 

MICROMASTER 

SINAMICS G130 

SINAMICS G150 

SINAMICS S150 

SINAMICS G130 

SINAMICS G150 

SINAMICS S150 

SINAMICS S120 

ROBICON Perfect 

Harmony 

SINAMICS GM150 

ROBICON 

Perfect Harmony 

SINAMICS GM150 

SINAMICS GL150 

16

Overview of drive converters 

for the water industry 

SINAMICS G120 SINAMICS G130 SINAMICS G150 SINAMICS GM150 SINAMICS GL150 MICROMASTER ROBICON Perfect 

Harmony 

0.37 – 90 75 – 1,500 75 – 1,500 600 – 27,000 6,000 – 120,000 0.12 – 250 150 – 120,000 

380 – 480 

660 – 690 

380 – 690 380 – 690 2,300 – 7,200 1,800 – 12,000 380 – 500 2,300 – 13,800 

Cooling using an 

external fan, 

convection cooling 

Integrated fan Integrated fan Air- and 

liquid-cooled 

Air- and 

liquid-cooled 

Cooling using 

an external fan 

Air- and 

liquid-cooled 

IP20 IP00, IP20 IP20, IP21, IP23, 

IP54 

Air-cooled IP22, 

optional IP42, 

liquid-cooled IP43, 

optional IP54 

Air-cooled IP20, 

optional IP41, 

liquid-cooled IP41, 

optional IP54 

IP20 

IP31, IP42, IP54 

Low-voltage 

induction motors 

in aluminum or 

gray cast iron 

Low-voltage 


in gray cast iron 

Low-voltage 


in gray cast iron 

High-voltage 

induction and 

synchronous motors 

High-voltage 


Low-voltage 


in aluminum or 

gray cast iron 

High-voltage 

induction and 


17

Würzburg water treatment plant 

Task 

In order to ensure optimum biological cleaning 

the amount of oxygen injected must 

be continually adapted to the actual amount 

of prevailing dirt and pollution. The City of 

Würzburg wanted to achieve a higher degree 

of precision in this operation and at 

the same time reduce the operating costs. 

Solution 

The existing fixed-speed drives were replaced 

by SINAMICS G150-based variablespeed 

systems to achieve a precise and 

energy-saving operation that also reduces 

the stress on the mechanical system. The 

drive converters were integrated into the 

existing supervisory control system of the 

water treatment plant. 

The supervisory control system continually 

determines the actual oxygen demand by 

measuring the oxygen and ammonium concentration 

in the activation basins and appropriately 

adjusting the speed of the turbocompressor 

drive. This means that the amount of 

oxygen injected is significantly more precisely 

dosed than before the modernization. 


• SINAMICS G150 drive converter 

15

Siemens AG 

Industry Sector 

Large Drives 

P. O. Box 47 43 

90025 NÜRNBERG 

GERMANY 

www.siemens.com/drives 

Subject to change without prior notice 

Order No.: E20001-A270-P500-X-7600 

Dispo 21503 

21/12387 MK.LD.XX.LDAL.52.8.04 WS 04083. 

Printed in Germany 

© Siemens AG 2008 

The information provided in this brochure contains 

merely general descriptions or characteristics of performance 

which in actual case of use do not always 

apply as described or which may change as a result of 

further development of the products. An obligation to 

provide the respective characteristics shall only exist if 

expressly agreed in the terms of contract. 

All product designations may be trademarks or product 

names of Siemens AG or supplier companies whose use 

by third parties for their own purposes could violate the 

rights of the owners.

Drives for Water Industry - Industria de Siemens

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