Lenze DSD Bedienungsanleitung PDF herunterladen (Seite 176)

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101

7Applications

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

 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

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

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