Drive Controller Derating - Siemens SIMATIC MICRO-DRIVE Equipment Manual

5.2

Drive controller derating

The maximum permissible output current for PDCs of performance class 100 W must be
reduced as follows depending on the installation altitude and ambient temperature.
The derating relates to the rated current of the power unit. The maximum current from the
power unit may be taken at an average speed of > 10 Hz (corresponds to the rotating field
frequency > 10 Hz for EC motors over a period of 20 s). At frequencies < 10 Hz, the maximum
permissible current corresponds to the rated current of the power unit.
Derating as a function of the installation altitude
For all permissible mounting types, starting from an installation altitude of 1000 m, a
derating of 10% current per additional 1000 m elevation gain applies. In this case, the motor
current and the output current of the digital outputs must be reduced.
All other functions do not have to be reduced up to the maximum installation altitude.
The figure below shows the maximum permitted output current as a function of installation
altitude for the derating.
Figure 5-1
Derating depending on the ambient temperature
With horizontal mounting (horizontal mounting rail), no restrictions are necessary for the
PDC100(F) up to the maximum temperature.
With vertical mounting (vertical mounting rail), the PDC100(F) may be operated up to a
maximum ambient temperature of 40 °C.
PDC100(F)
Equipment Manual, 03/2021, A5E50502703-AA
Derating for PDC100(F) as a function of the installation altitude
Technical specifications
5.2 Drive controller derating
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