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7Applications
7.19 Fan
180
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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7.19.2.5 Fan load characteristic
[7-177] Load characteristics of the fan
7.19.2.6 Additional moment of inertia
Symbol Description
M(n) Selection of the load characteristic of the fan
• Fans generally have a square-law load characteristic.
Constant characteristic (M constant)
Square-law characteristic (M n²)
Rated point of the fan
M
n
0
1
2
Note!
Please use Inverter Drives 8400 in the "VFCplus eco" operating mode.
The energy-optimised and sensorless operation as well as motor management
with demand-oriented motor control are very well suited for fans with quadratic
load characteristics.
Symbol Description
J
add
Moment of inertia of the fan.
• Value can be entered directly or calculated using a inertia calculator.
Inertial calculator
( 407)
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