SEW-Eurodrive MOVITRAC 07, Системное руководство

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System Manual – MOVITRAC® 07
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Motor selection
Project Planning
Voltage/fre-
quency charac-
teristic The asynchronous motor follows a load-dependent voltage/frequency characteristic in
V/f operating mode. The motor gets the full motor torque even at the slowest speeds.
This is because the motor model is continuously calculated in VFC mode. Set the char-
acteristic curve during startup with rated motor voltage and rated motor frequency. The
setting determines the speed-dependent torque and power characteristics of the asyn-
chronous motor.
Characteristic curve of an asynchronous motor with rated voltage U
M
and rated frequen-
cy 50 / 60 Hz.
The MOVITRAC
®
07 output voltage is limited by the supply voltage which is connected.
Dynamic applica-
tions For dynamic applications, it is necessary to have a drive with an inverter rated current
greater than the motor rated current.
Set the following parameters so the motor can generate at most 150 % of the rated mo-
tor torque:
• Current limit P303
• Slip compensation P324
Increase these parameters manually by a factor of approx. 1.4 for dynamic applications.
03102CXX
Figure 43: Voltage/frequency characteristic (U
M
= motor volt-
age)