Danfoss VLT AQUA Drive Design Manual

Also see for vlt aqua: Instructions Design guide Instruction manual Operating instructions Design guide

Contents

NOTEMounting adjustable frequency drives in aggressive environments increases the riskof stoppages and considerably reduces the life of the drive.Before installing the adjustable frequency drive, check the ambient air for liquids, particles andgases. This is done by observing existing installations in this environment. A typical indicator ofharmful airborne liquids is the presence of water or oil on metal parts, or the corrosion of metalparts.Excessive dust particle levels are often found on installation cabinets and existing electrical in-stallations. One indicator of aggressive airborne gases is the blackening of copper rails and cableends on existing installations.2.6. Vibration and shockThe adjustable frequency drive has been tested according to the procedure based on the shownstandards:The adjustable frequency drive complies with requirements that exist for units mounted on thewalls and floors of production premises, as well as in panels bolted to walls or floors.IEC/EN 60068-2-6: Vibration (sinusoidal) - 1970IEC/EN 60068-2-64: Vibration, broad-band random2.7. Advantages2.7.1. Why use an adjustable frequency drive for controlling fans andpumps?An adjustable frequency drive takes advantage of the fact that centrifugal fans and pumps followthe laws of proportionality for such fans and pumps. For further information, seeThe Laws ofProportionality text.2.7.2. The clear advantage - energy savingsThe very clear advantage of using an adjustable frequency drive for controlling the speed of fansor pumps lies in the electricity savings.Compared to alternative control systems and technologies, an adjustable frequency drive is theoptimum energy control system for controlling fan and pump systems.2.7.3. Example of energy savingsAs can be seen from the figure (the laws of proportionality), the flow is controlled by changingthe rpm. By reducing the rated speed by only 20%, the flow is also reduced by 20%. This isbecause the flow is directly proportional to the rpm. The consumption of electricity, however, isreduced by 50%.2. Introduction to the VLT AQUA Drive VLT® AQUA Drive Design Guide16 MG.20.N2.22 - VLT® is a registered Danfoss trademark.2