Vibration And Shock - Danfoss VLT Series Design Manual

VLT ® HVAC Drive Design Guide
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.

2.5. 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:
2.6. Advantages
2.6.1. 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
2.6.2. 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.
2.6.3. 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%.
If the system in question only needs to be able to supply a flow corresponding to 100% a few
days each year, while the average is below 80% of the rated flow for the remainder of the year,
the amount of energy saved is even greater than 50%.
Vibration (sinusoidal) - 1970
Vibration, broad-band random
text.
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
2. Introduction to the VLT HVAC Drive
The Laws of
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