Lenze DSD - Manual (Page 177)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
177
7 Applications
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!
P
Q p Δ ⋅
1000
--------------- =
P
Vlt
P
η
Vlt
--------- =