Siemens S120 Manual page 120

Power Modules
4.2 Blocksize Power Modules (PM240-2)
It is not permissible that the Power Module is operated with its maximum rated current at
output frequencies below 10 Hz. Otherwise, its service life could be reduced.
Figure 4-26
Figure 4-27
120
Output current as a function of the output frequency
Current derating as a function of the DC-link voltage
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
AC Drive