Mechanical properties
3
3.1 Cooling
The 1FK2 is a non-ventilated motor.
To ensure sucient 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 ange when the motor is connected to
the mounting surface.
• Observe the following mounting conditions for the specied motor data:
Shaft height Steel plate, width x height x thickness (in mm)
1FK2☐03 250 x 250 x 6
1FK2☐04
1FK2☐05 300 x 300 x 12
1FK2☐06
450 x 370 x 30
1FK2☐08
1FK2☐10
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 ambient conditions are dierent, derating may be required. You can nd information on
this in the section "Derating factors (Page 28)".
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 20 % to 30 %.
Reduce the torque at 3000/minute static torque by 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. If the motor
exceeds the maximum temperature, the converter switches o the motor with the error
message "Motor overtemperature".
1FK2 Synchronous Motors for SINAMICS S120
Conguration Manual, 02/2022, A5E46927724B AD 35
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