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Article Date: 2nd July 2013

Siemens Building Technologies - Energy Efficient Modular Variable Speed Drive for HVAC Systems Launched by Siemens

Speed Drives - Air Conditioning - Building Automation - Heating Systems

Siemens Speed Drive

The Siemens Building Technologies division has launched a new energy efficient variable speed drive allowing users to reduce their heating, ventilation and air conditioning (HVAC) operating costs.

Suitable for applications requiring an efficient drive for pumps or fans, the G120P variable speed drive (VSD) is user-friendly and can also be used in harsh environmental conditions due to its protection classes of IP54 and IP55. For example, it can operate in temperatures up to 60°C – an essential feature for controlling the speed of fans and recirculation pumps in heating and cooling systems.

Operating in a power range from 0.37 to 90 kilowatts (kW), the new VSD has a modular structure consisting of a control unit, the power module and an operating panel (basic operating panel BOP-2, or intelligent operating panel IOP) or a blanking cover. This design enables individual components to be exchanged without having to replace the entire drive. For example, a power module can be exchanged without reconfiguring the entire device or rewiring the signal and bus cables.

The G120P VSD is designed to suit the needs of pump installations and ventilation systems and therefore, also offers numerous safety features. The device can detect problems in the system (such as overloaded motors, pumps that are blocked or have run dry, blocked fans, cracked belts, etc.) and respond to them immediately, for example, by shutting down the pump or fan, triggering an alarm or starting a predefined process.

When used in ventilation systems, the G120P automatically switches to emergency mode in the event of a fire. As a result, the overpressure generated by the ventilation is retained for as long as possible, and escape routes remain smoke-free.

The G120P has various functions to improve energy efficiency for operating HVAC applications and systems economically. The integrated hibernation function supports an energy efficient and wear-reducing idle mode, depending on the current requirements. The drive also automatically switches to mains operation at nominal speeds, cutting energy consumption by up to 3%.

A comprehensive fan, filter and motor monitoring system is integrated into the device to avoid failure of HVAC plant and rising operating costs. Flow optimisation in U/f mode and during vector control adapts the motor magnetisation to the partial load of the pump or fan. This helps increase motor efficiency under partial load, substantially increasing the efficiency of the overall system.

Plug connections for motor and power cables on the power modules up to frame size C and screwless terminals on the control unit allow easy installation of the G120P. The Starter software, which comes with several application wizards, is available to facilitate commissioning. The VSD also has an integrated micro memory card (MMC) slot for commissioning and diagnosis. This makes it possible to pre-configure the parameters for entire series of VSDs and to back-up settings.

The I/O and fieldbus interfaces, such as Modbus RTU, USS and BACnet MS/TP, are customised to the specific requirements of HVAC. This allows the VSD to be integrated easily into building energy management systems such as Siemens Desigo.

The G120P models with protection classes IP54 (with the BOP-2 or blanking cover) and IP55 (with IOP) are available now, and a device with the lower protection class IP20, suitable for panel mounting, will follow later this year.

For more information about the G120P VSD, please visit www.siemens.com/G120P

The Siemens Building Technologies division offers the latest technology across building automation, heating, ventilation and air conditioning (HVAC), fire protection and security.

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