info to follow

Low Voltage

Variable Speed Drive technology that unlocks new potential

Variable Speed Drive

Energy is valuable. Electrical power is the most important resource in industry and ensures that motors run, machines operate and plants manufacture. So it doesn’t come as a big surprise that industry is responsible for 40% of the total power consumption.

However, it is surprising that the electrical drive systems are responsible for two thirds of that consumption. An enormous share which opens up many possibilities, especially with regard to rising energy prices: With an optimized design and dimensioning of plant and targeted selection of components, companies can save substantial amounts of energy costs.

Tapping the right potential is what counts

Electrical motors and frequency drives are the heart of a drive system and have the highest energy savings potential. The continuous operation of the motor is of particular importance in this case – motors with an increased efficiency level help save valuable kilowatt hours, and the frequency drives saves additionally by adapting to the optimum operating point. Variable-speed drives depend on the type of driven machine. This is where optimized machines such as pumps, fans and compressors show their “economical side”.

An investment in the future that pays off

One thing is clear: Purchasing energy-saving motors is an investment. But low operating costs and machine-friendly operation in the plant thanks to the use of frequency drives and/or energy-saving motors make sure that the investment often fully amortizes over a period of only a few months – while your plant continues to save costs throughout its entire service life. And you’re not the only one profiting from this. A drive system that optimally utilizes energy contributes to a sustained reduction in CO2 emissions – so the environment benefits as well.

Reduction of dvdt using Output Chokes information sheet. (PDF – 180kb)

Filter SIDAC-F information sheet. (PDF – 500kb)

CUVC Interface (PDF – 77kb)

VC Shortguide (PDF – 26kb)


MICROMASTER Frequency Inverters

A vast number of today’s motor applications require the use of a Variable Speed Drive to ensure optimum performance. Making the correct speed adjustments can ensure dramatic savings in energy costs and improvements in application performance. From the technology available, which unit should you select to ensure these goals are met and your investment pays off?

As a supplier of complete drive systems and technology, Siemens can offer you a wide range of frequency inverters: the MICROMASTER family. Thanks to their modular design, all the inverter units can be used in a variety of applications and are extremely flexible in use. With power ratings ranging from 0.12 to 250 kW (0.16 to 300 HP), they can readily be adapted to new requirements without any great effort.

Our frequency inverters combine the highest technical quality with versatile functionality: from the basic MICROMASTER 410 for simple applications to the high-performance MICROMASTER 440 with sensorless vector control and a power range up to 250 kW (300 HP). Each individual member of our MICROMASTER family is characterized by its exceptionally simple handling: from installation and commissioning to operator control. Later adaptation to new requirements is simplicity itself.
Each frequency inverter belonging to the family allows flexible circuit connection of inputs and outputs for optimum link-up of a broad variety of digital and analog signals. With its default factory settings, it is immediately ready for use.

Part of Totally Integrated Automation (TIA)

All standard Siemens drives with the PROFIBUS option are integrated in TIA. On the basis of TIA’s three-pronged universality with regard to communication, configuration and data management, our drive systems perform automation tasks smoothly and efficiently, with a savings potential of up to 30 %.

Safe operation – all over the world

All the important protection and overload functions are already standard features of our inverters. And the requirements of the EU low-voltage directive are met by all the devices in the MICROMASTER family. They have the CE label, as well as both UL and CUL certification.

Micromaster Frequency Inverters Selection Catalogue. (PDF – 700kb)

MM440 Faults and Alarms catalogue. (PDF – 85kb)

MM440 New Catalogue. (PDF – 700kb)

MM440 Dimensions. (PDF – 300kb)

MM440 Features & Functions. (PDF – 150kb)

MM440 Frequency Inverter Technical Specifications. (PDF – 45kb)

MM440 I/O

The MICROMASTER range of low voltage variable speed drives

Sinamics Family

Sinamics G150 drive converter cabinets units are designed for use in variable speed drives in machine construction and plant engineering.

They have been specially tuned to the requirement of drives with quadratic and constant load characteristics, with medium performance requirements and without regenerative feedback. The control accuracy of the sensorless vector control is suitable for most applications, and additional actually speed value encoders are therefore superfluous.

However, the Sinamics G150 converters are optionally available with an encoder evaluator in order to handle application that require an encoder for plant specific reasons. Sinamics drive converter cabinet units offer an economic drive solution that can be matched to customers specific requirements by adding from the wide range of available components and options.

Sinamics Family Selection Catalogue. (PDF – 600kb)

Sinamics G150 Overview. (PDF – 300kb)

Sinamics G150 technical catalogue. (PDF – 850kb)

Sinamics TM31 Module (PDF – 90kb)

Sinamics G150 Dimension Drawings. (PDF – 820kb)

Sinamics G150 Option Descriptions. (PDF – 150kb)

Sinamics G150 technical data sheet – 500V. (PDF – 55kb)

Sinamics G150 technical data sheet – General. (PDF – 55kb)

Sinamics Drives System Brochure. (PDF – 1.5MB)

Sinamics Drives Graphic Poster. (PDF – 60kb)

ROBICON Perfect Harmony Power Control Systems

In the ROBICON Perfect Harmony, a series of low voltage cells are linked together to build the medium voltage power output of the drive system. With this topology, the drive can be scaled precisely for a very wide range of voltage and output power. Additionally, the ROBICON Perfect Harmony offers increased availability because of its modular design and ability to bypass any one cell during operation while maintaining the full output voltage.

Furthermore, the integral transformer with phase-shifted secondaries provides 18-pulse or better input harmonic cancellation with a power factor above .95 under any operating conditions. This eliminates the need for input harmonic filters or power factor compensation, while completely avoiding any common-mode voltages from being imposed on the motor. The quality of the output voltage is so close to perfect sine-wave shape that motors of literally any type – old or new, low-speed or high-speed – can be operated without any additional stress. Issues related to dV/dt, overheating and increased torsion vibrations are a thing of the past.

Perfect Harmony Drive (Powerpoint – 6MB)