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Current Derating - Depending On The Installation Altitude - Siemens Sinamics G110M Original Instructions Manual

Distributed converter for simogear geared motors.
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12.5 Current derating - depending on the installation altitude

Atmospheric pollution and water
When fully assembled the inverter has an IP65/IP66 rating. This means that the inverter is
totally protected against dust and low pressure jets of water. Any unused connections should
be covered with the correct sealing caps to ensure the IP65/IP66 rating.
IP protection of the motor
The motors of the G110M system have a standard IP protection rating of IP54. The IP rating
of the G110M system is determined by the lowest IP rating of its components
Current derating - depending on the installation altitude
Current derating depending on the installation altitude
Above 1000 m above sea level you must reduce the inverter output current as a result of the
lower cooling capability of the air.
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.
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD


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