Siemens SINAMICS S120 Commissioning Manual page 170

Commissioning
2.13 Commissioning SIMOTICS 1FW6 built-in torque motors
When a torque motor is being operated, the rotor must not exceed a temperature of 120°C
otherwise the permanent magnet may become demagnetized.
This must be ensured during initial commissioning by carrying out the appropriate checks.
Special attention should be paid here to non-uniform current loads during standstill or
operation with short, cyclic rotation because this can generate extremely high, localized
temperatures.
NOTICE
The motor may overheat without temperature protection and be destroyed.
Check whether the temperature protection is effective before (!) switching on the DC link
voltage for the first time!
168
WARNING
Commissioning Manual, (IH1), 01/2013, 6SL3097-4AF00-0BP3
Commissioning Manual