1FT2 synchronous motors for SINAMICS S120
Configuration Manual, 03/2021, A5E50645584B AA
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3.1 Cooling
The 1FT2 is a non-ventilated motor.
To ensure sufficient heat dissipation when installed, the motor requires a minimum clearance
of 100 mm from adjacent components on three sides.
• Maintain theses clearances irrespective of the following mounting variants.
Non-thermally insulated mounting
Some of the motor power loss is dissipated through the flange when the motor is connected
to the mounting surface.
• Observe the following mounting conditions for the specified motor data:
Steel plate, width x height x thickness (in mm)
450 x 370 x 30
The data in the table refers to an ambient temperature of 40 °C and an installation altitude up
to 1000 m above sea level.
If the environmental conditions are different, derating may be required. You can find
information on this in the section "Derating factors (Page 108)".
For larger mounting surfaces, the heat dissipation conditions improve.
Thermally insulated mounting without additional mounted components
For self-cooled motors, you must reduce the S1-characteristic curve as follows:
Reduce the motor static torque by a range of 20% to 30%.
Reduce the torque at 3000 r/min by a range of 40% to 50%.
Thermal motor protection
The converter monitors the motor temperature based on a thermal motor model and issues
the alarm "Motor overtemperature" before the maximum temperature is reached. When the
motor exceeds the maximum temperature, the converter switches off the motor with the
error message "Motor overtemperature".
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