Siemens Sinamics S120 Function Manual page 317

The following quantities can result in a response to thermal overload:
● Heat sink temperature via r0037.[0]
● Chip temperature via r0037.[1]
● Power unit overload after I2t calculation via r0036
Possible measures to avoid thermal overload:
● For servo control, reduce the output current (closed-loop speed/velocity or torque/force)
● Reduction of the output frequency for U/f control.
● Reduction of the pulse frequency for vector control.
Parameter r0293 "Power unit alarm threshold model temperature" indicates the temperature
alarm threshold for the difference between the chip and heat-sink temperatures.
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
6.25 Derating function for chassis units
Basic functions
315