Frequency Inverter ST600 Series High-Performance Multifunction VFD Technical data
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B.6 EMC regulations
The EMC product standard (EN 61800-3) describes the EMC requirements on VFDs.
Application environment categories
Category I: Civilian environments, including application scenarios where VFDs are directly connected
to the civil power supply low-voltage grids without intermediate transformers
Category II: All environments except those in Category I.
VFD categories
C1: Rated voltage lower than 1000 V, applied to environments of Category I.
C2: Rated voltage lower than 1000 V, non-plug, socket, or mobile devices; power drive systems that
must be installed and operated by specialized personnel when applied to environments of Category I.
Note: The EMC standard IEC/EN 61800-3 no longer restricts the power distribution of VFDs, but it
specifies their use, installation, and commissioning. Specialized personnel or organizations must have
the necessary skills (including the EMC-related knowledge) for installing and/or performing
commissioning on the electrical drive systems.
C3: Rated voltage lower than 1000 V, applied to environments of Category II. They cannot be applied
to environments of Category I.
C4: Rated voltage higher than 1000 V, or rated current higher or equal to 400 A, applied to complex
systems in environments of Category II.
B.6.1 VFD category C2
The induction disturbance limit meets the following stipulations:
1. Select an optional EMC filter according to Appendix D and install it following the description in the
EMC filter manual.
2. Select the motor and control cables according to the description in the manual.
3. Install the VFD according to the description in the manual.
4. For the maximum length of the motor cable, see section 0 "
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