Danfoss - Inverter Drives / Controls

HVAC Inverter Drives - Controls - Energy Optimisation

Danfoss VLT® HVAC Driver - Inverter Drives / Controls

The Benefits of Ownership

Today the vast majority of new public building projects use AC drives for the fans, pumps and compressors on the air conditioning systems. Globally, Danfoss finds itself at the heart of such projects, VLT® drives being selected for their compatibility with most BMS control systems, simplifying and reducing installation costs. This ensures close comfortable control of the building environment and facilitates simple updating of the system. Prestige buildings such as the Natural History Museum, the ‘Gherkin’ and the Crowne Plaza Copenhagen Towers all use VLT® HVAC Drives to control their environments. The recent installation at Brighton and Sussex University Hospitals has resulted in energy savings of £48,000 (533,000 kWh) and reduced CO2 emissions by 288 tonnes.

VLT® HVAC Drive - 1.1kW to 1.4MW

Designed specifically for fan, pump and compressor applications, especially within the building services environment. Dedicated to applications within the air conditioning market, the VLT® HVAC Drive is the world’s leading HVAC drive. Power sizes range from 1.1kW to 1.4MW in a variety of IP rated enclosures.

Enclosure Choice - Available in IP00, IP20, IP55 and IP66 enclosures as standard. The ‘bookshelf’ designs are available for high-density panel installations. The ultra-compact IP55 enclosures are easily mounted directly on a wall, the AHU or pump skid. The IP66 option is suitable for external use.

VLT® HVAC Drive Features

User Centred Design - Programming simplified. From the initiation of the design process, Danfoss design engineers spent weeks ‘in the shoes’ of the end users. The result is the extremely user friendly and intuitive award winning human-machine interface that reflects familiarity with mobile phone use. The alpha-numeric graphical keypad displays clear English text.

Automatic Energy Optimiser (AEO) - Ensures maximum energy savings by optimising the motor’s magnetic field under all load conditions. This feature also simplifies drive set-up and minimises motor noise levels.

Sleep Mode - In this mode the drive detects situations with low or zero flow. Instead of continuous operation, it boosts system pressure and then stops to save energy and starts again when the pressure falls below the lower set-point.

Serial Communications - Compatibility with BACnet, Modbus RTU, METASYS and SIEMENS FLN as standard and can be delivered with the Lonworks open protocol as a built in option.

Fire Override Mode - In the event of fire the drive will run until eventual self-destruction. It can be set to maintain a higher level of air pressure than in other parts of the building, ensuring that fire escapes remain clear of smoke.

Stand-alone Functionality - Provides intelligent stand-alone functionality via:-

• Built-in time clock
• Smart Logic Controller
• Four auto-tuned PID controllers
• Programmable scheduled maintenance function

Power Factor - Maintains near unity power factor at all loads and speeds and minimises the need for power factor correction equipment, giving both space and financial savings.

EMC - Electromagnetic Compatibility - Electromagnetic ‘noise’ is an important consideration when ensuring compatibility between frequency converters and other building services equipment, computers or other sensitive equipment in the building environment. Meets all international standards on EMC compatibility on both emissions and susceptibility.

Harmonics - The importance of chokes and filters in all medium and high power applications cannot be overstated. The integral chokes and filters in the VLT® HVAC Drive ensure that mains harmonics are minimised while output cable length to the motor is maximised, eliminating the need for output line chokes.

Motors do not have to be de-rated to allow for the harmonic content of the output waveform and the output circuit can if necessary be broken under load without auxiliary control switching or concern for switching surges.