
6
Operating modes and limit values
Special application
Operating Instructions – EDR..71 – 315, EDRN63 – 315
114
6.7
Special application
If the conditions of the typical application are not met, the motor terminal voltage can
deviate and, as a result, the motor can heat up excessively.
The deviating motor terminal voltage changes the shape of the thermal characteristic
curve. The calculation and observation of points D (field weakening f
D*
) and E (current
limit I
E*
and torque M
E*
) during startup prevents the motor from overheating.
You have to calculate the current limit I
E*
only for drives of category 2.
The project planning procedure is as follows:
•
Calculate the motor terminal voltage
•
Calculate the field weakening f
D*
•
Calculate the torque characteristics M
E*
•
Calculate the current limit IE* for motors of category 2
25896334/EN – 06/2019
Содержание EDR200
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