Current Derating As A Function Of The Installation Altitude - Siemens SINAMICS G110M Operating Instructions Manual

Technical data

11.5 Current derating as a function of the installation altitude

11.5 Current derating as a function of the installation altitude
Current derating depending on the installation altitude
The permissible converter output current is reduced above an installation altitude of 1000 m.
Motor speed
The speed at which the motor is running affects the temperature that is generated by the motor.
At times it may be necessary to derate the speed of the motor by decrease the input current from
the converter.
The derating curve in relationship to the input current from the converter is shown in the
following diagram.
Input current [%]*
100
90
80
70
*
Up to the maximum capability of the converter output
current.
394
50 40 30
Motor frequency (Speed)
20 10
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL