Lenze DSD User Manual download pdf (Page 458)

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101

18 Drive dimensioning messages

18.5 Lenze motor

458

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

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18.5.10 A continuous operation characteristic for inverter operation is not available

18.5.11 Motor temperature too high at switching frequency < 8 kHz

18.5.12 The limit value of xxx % of the rated torque is exceeded

Note!

There is no continuous operation characteristic for the motor if operated on an inverter.

The equivalent characteristic does not take account of restrictions on motor operation due to its ventila-

tion.

Cause Effects Possible remedies

There is no data for this self-ventilat-

ed motor.

The motor may get too hot when be-

ing operated at field frequencies

<20Hz.

• In case of long operations at low

speed or with high thermal utili-

sation, select a motor with forced

ventilation.

• Select a more powerful motor.

Note!

The motor selected must not be permanently operated at a switching frequency < 8 kHz.

Set a fixed switching frequency on the inverter to ensure that it is not automatically reduced.

Cause Effects Possible remedies

At low switching frequencies the

losses in the motor increase.

Motor gets too hot. • Select bigger motor.

• Set switching frequency perma-

nently to min. 8 kHz if the drive

continuously runs with a too low

switching frequency.

Effects of low switching frequencies on the motor

( 433)

Warning!

The utilisation of the motor is xxx % of the rated torque.

If the motor is operated on an inverter with V/f control, the limit value of yyy % is exceeded.

The operation is not permissible!

Cause Effects Possible remedies

With a V/f characteristic control

without feedback and low speed

range, the motor is not magnetised

as required. The motor cannot reach

the rated torque anymore.

The hoist drive cannot hold the load. • With a rated motor power

< 7.5 kW, select a bigger motor.

• Select a control mode with feed-

back.

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