Lenze DSD - Manual (Page 176)

7 Applications
7.18 Pump
176
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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7.18.2.6 Load characteristic of the pump
[7-171] Load characteristics of the pump
7.18.2.7 Additional moment of inertia
Symbol Description
M(n) Selection of the load characteristic of the pump
• Centrifugal pumps (flow principle) generally have a square-law, reciprocating pumps (princi-
ple of positive displacement) a constant load characteristic.
 Constant characteristic (M ≈ constant)
 Square-law characteristic (M ≈ n²)
 Rated point of the pump
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 pumps with quadratic
load characteristics.
Symbol Description
J
add
Moment of inertia of the pump impeller.
• The moment of inertia can generally be disregarded.
• Value can be entered directly or calculated using a inertia calculator.
Inertial calculator ( 407)