Lenze DSD Manual do Utilizador descarregar pdf (Página 472)

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18 Drive dimensioning messages

18.8 Inverters

472

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

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18.8.25 Thermal utilisation of the inverter is > 80 %

Warning!

The thermal utilisation of the inverter is xxx.

A manual, thermal check of the inverter is required

in the case of longer or cyclic operating phases with field frequencies < 5 Hz and

an output current > rated current.

Cause Effects Possible remedies

The actual thermal utilisation (I×t) is

determined within the inverter, as a

function of the field frequency and

with different time constants.

The DSD model works with a simpli-

fied algorithm.

At field frequencies < 5 Hz and an

output current > rated current, the

actual utilisation may be slightly

higher than the utilisation deter-

mined by DSD.

• Provide for sufficient I×t reserves

by selecting a more powerful in-

verter.

• Detailed check of the thermal uti-

lisation.

• Contact Lenze Support.

• Determine thermal utilisation

in tests.

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