Vibration And Shock - Danfoss VLT AQUA Drive Design Manual

2. Introduction to the VLT AQUA Drive
2
Before installing the adjustable frequency drive, check the ambient air for liquids, particles and
gases. This is done by observing existing installations in this environment. A typical indicator of
harmful airborne liquids is the presence of water or oil on metal parts, or the corrosion of metal
parts.
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 cable
ends on existing installations.

2.6. Vibration and shock

The adjustable frequency drive has been tested according to the procedure based on the shown
standards:
The adjustable frequency drive complies with requirements that exist for units mounted on the
walls and floors of production premises, as well as in panels bolted to walls or floors.
IEC/EN 60068-2-6:
IEC/EN 60068-2-64:
2.7. Advantages
2.7.1. Why use an adjustable frequency drive for controlling fans and
pumps?
An adjustable frequency drive takes advantage of the fact that centrifugal fans and pumps follow
the laws of proportionality for such fans and pumps. For further information, see
Proportionality
2.7.2. The clear advantage - energy savings
The very clear advantage of using an adjustable frequency drive for controlling the speed of fans
or pumps lies in the electricity savings.
Compared to alternative control systems and technologies, an adjustable frequency drive is the
optimum energy control system for controlling fan and pump systems.
2.7.3. Example of energy savings
As can be seen from the figure (the laws of proportionality), the flow is controlled by changing
the rpm. By reducing the rated speed by only 20%, the flow is also reduced by 20%. This is
because the flow is directly proportional to the rpm. The consumption of electricity, however, is
reduced by 50%.
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NOTE
Mounting adjustable frequency drives in aggressive environments increases the risk
of stoppages and considerably reduces the life of the drive.
text.
MG.20.N2.22 - VLT
Vibration (sinusoidal) - 1970
Vibration, broad-band random
® is a registered Danfoss trademark.
VLT ® AQUA Drive Design Guide
The Laws of