Thermal Motor Protection - Siemens SIMOTICS S-1FT2 Operating Instructions Manual

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 different, derating may be required. You can find information
on this in the section "Derating factors (Page 32)".
For larger mounting surfaces, the heat dissipation conditions improve.
Thermally insulated mounting without additional mounted components
If motors are mounted so that they are thermally insulated then heat cannot dissipate via the
flange.
Therefore reduce the S1 characteristic as follows:
• Reduce the motor static torque by 20 % to 30 %.
• Reduce the torque at 3000 r/min by 40 % to 50 %.
4.5.4

Thermal motor protection

Description
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 off the motor with the error
message "Motor overtemperature".
If the ambient temperature exceeds 40 °C, you need to set the ambient temperature on the
converter.
• To do this, select parameter p0613 at the converter, and set the maximum ambient
temperature that occurs.
Parameter r0034 indicates the thermal load of the motor as a percentage. The reading is
influenced by the ambient temperature selected in parameter p0613.
More information is provided in the converter manual.
SIMOTICS S-1FT2 synchronous motors for SINAMICS S120
Operating Instructions, 12/2023, A5E50610821B AF
Mounting and options
4.5 Cooling
49