● Category C3:
PDS for rated voltages < 1000 V - only for operation in the "second environment".
● Category C4:
PDS for IT line supplies for operation in complex systems in the "second environment".
An EMC plan is required.
Second environment - category C4
An unfiltered inverter corresponds to category C4.
EMC measures in the "second environment", category C4, are implemented on the basis of
an EMC plan at the system level.
EMC-compliant setup of the machine or plant (Page 41).
Second environment - category C3
Immunity
The inverters comply with the requirements of the standard.
Interference emission for unfiltered inverters
Inverters with integrated filter comply with the requirements of the standard.
Cable-conducted, high-frequency noise emission of an unfiltered inverter
Either install an external filter for the inverter - or install corresponding filters at the system
level.
Field-conducted, high-frequency noise emission of an unfiltered inverter
When installed professionally in accordance with EMC guidelines, the inverters fulfill the
requirements of the standard.
Second environment - category C2
Immunity
The inverter is suitable for the "second environment".
Emitted interference
The inverters fulfill the requirements of the standard when the following conditions are satisfied.
● You are using an inverter with an integrated filter.
● The inverter is connected to a TN or TT line supply with grounded neutral point.
● You use a shielded motor cable with low capacitance.
● You maintain the permissible motor cable length.
Maximum permissible motor cable length (Page 77)
Technical data
10.9 Electromagnetic compatibility of the inverter
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
419
