HEIDENHAIN MANUALplus 620 Technical Manual page 862

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6.16.12 Peculiarities in weakened-field operation with CC 61xx and CC 424

Reduction of the

magnetization

MP_iCtrlMotVRedFact

Settings in the configuration editor

ParameterSets

[Key name of the parameter set]

CfgCurrentControl

iCtrlMotVRedFact

Some of the asynchronous spindle motors require a high magnetizing current

at low speeds (n < n

field weakening

lead to thermal motor problems at the rpm for field weakening n

there is no load.

The nominal voltage (and so also the nominal magnetization current) at the

rpm for field weakening n

MP_iCtrlMotVRedFact. The entered reduction results in a nominal voltage

curve as shown in the figure below. The maximum nominal voltage is reached

when n = 3 · n

field weakening

% (MP_iCtrlMotVRedFact = 60).

If a load is placed on the drive, then the nominal voltage is increased again

automatically in order to improve the dynamics.

). This magnetizing current can, however,

when there is no load can be reduced with

. The nominal voltage can be reduced by max. 60

HEIDENHAIN Technical Manual MANUALplus 620