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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23 177

7Applications

7.19 Fan

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7.19 Fan

Fans have the task to move a medium with a specific density against a stationary pressure. The pow-

er (P) that has to be applied pneumatically for this purpose can be calculated by means of the differ-

ential pressure (Δp) and the volume flow (Q).

• The required data (efficiency, rated speed) of the fan can be gathered from the fan manufactur-

er's data sheet.

7.19.1 Calculations

For a fan according to the drawing the following applies:

[7-172] Equation 1: Power of the medium

• The factor 1000 results from the adaptation to the units.

Power of the fan

With the efficiency of the fan the required power of the fan is calculated:

[7-173] Equation 2: Power of the fan

 Note!

When altering the gas temperature, the torque requirement of the application changes.

This is to be taken into account with regard to the safety reserve!

Because of the square-law load characteristic the dimensioning is especially to be

checked with regard to undervoltage! Voltage drops at EMC components and the invert-

er also have to be taken into account!

QpΔ⋅

1000

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