Lenze DSD Manual de usuario descargar pdf (Pagina 351)

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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23 351

11 Drive Dimensioning

11.6 Inverters

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11.6.1.5 Overcurrent operation for Inverter Drives 8400

The inverters are designed for a temporary overcurrent. The utilisation by a defined, cyclic operation

is determined via the "Ixt" monitoring function. The I×t function consists of two moving averages

which are checked in parallel:

• A short-time moving average of the apparent motor current for a pulse utilisation.

• A continuous moving average of the apparent motor current for a continuous utilisation.

The characteristics of typical load functions and the simulation of the "Ixt" function are shown in the

following illustration:

[11-22] Overcurrent capability for Inverter Drives 8400 at 45 °C

Type of utilisation Utilisation cycle Condition for the monitoring func-

tion

Pulse utilisation 15 s I

rated,out

> 160 %

Permanent utilisation 180 s The monitoring function is switched

on continuously.

 Pulse utilisation (cycle of 15 s)

 Peak current

 Limited current during the recovery time

Δt

Load with peak current (typically 3 s)

Δt

Recovery time with limited current (typically 12 s)

 Permanent utilisation (cycle of 180 s)

 Peak current

 Limited current during the recovery time

Δt

Load with peak current (typically 60 s)

Δt

Recovery time with limited current (typically 120 s)

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I [%]

N,out

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Lenze DSD Manual de usuario Pagina 351

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