Siemens Sinamics PM250 Hardware Installation Manual page 65

Second environment - category C4
The unfiltered inverters correspond to category C4.
EMC measures in the second environment, category C4, are carried out on the basis of an
EMC plan on the system level.
Further information:
Second environment - category C3
Immunity
With respect to their immunity, the inverters are suitable for the second environment,
Category C3.
Interference emission for filtered inverters
Inverters with integrated filter are suitable for use in the second environment, Category C3.
Interference emission for unfiltered inverters
If you are using unfiltered inverters in an industrial plant, you must either use an external
filter for the inverter or install corresponding filters on the system level (conducted high-
frequency disturbance variables).
When installed professionally in accordance with EMC guidelines, the inverters fulfill the
requirements of the standard in relation to category C3 (field-based high-frequency
disturbance variables).
Second environment - category C2
Immunity
With respect to their immunity, the inverters are suitable for the second environment,
Category C2.
Emitted interference
General preconditions in order to maintain the limit values regarding noise emission for the
second environment, Category C2:
In order for the inverters to comply with the limit values for category C2 relating to emitted
interference, the following conditions must be fulfilled:
● You are using an inverter with an integrated filter
● The motor cable is shorter than 25 m.
● The pulse frequency does not exceed 4 kHz
● The current does not exceed the value of the LO input current
data (Page 58)
● You are using a shielded motor connection cable with low capacitance
PM250 Power Module
Hardware Installation Manual, 01/2016, A5E36265179B-AA
7.6 Electromagnetic compatibility of the inverter
EMC-compliant installation (Page 38).
Technical specifications
Power-dependent
65