Siemens Sinamics S120 Manual page 66

Motor Modules in booksize C/D-type format
3.2 Motor Modules with internal air cooling
Figure 3-21
Supplementary conditions applicable to operation at low frequencies
● Derating does not apply to acceleration from zero speed if an output frequency of >10 Hz
is reached within 100 ms.
● The D-type characteristic applies only to a 4 kHz pulse frequency. With a pulse frequency
of 8/16 kHz, the C-type characteristic must be used taking the relevant current derating
requirement into account.
● Current derating must be taken into account if the percentage time of operation at
frequencies <10 Hz is more than 2 % of the total daily operating time.
● Current derating must be taken into account for duty cycles with a continuous output
frequency of 0 to 10 Hz.
● For drive systems with induction motors (with slip frequency), the permissible continuous
load at zero speed corresponds to 75 % of I
type modules (e.g. suspended axis without counterweight or travel to fixed stop).
66
Output current during operation at low frequencies
for D-type modules, or 50 % of I
rated
Power Units in Booksize C/D-Type Format
Manual, 01/2017, 6SL3097-4AC20-0BP1
for C-
rated