The EMC product standard (EN 61800-3:2004) 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.
The induction disturbance limit meets the following stipulations:
1. Select an optional EMC filter according to Appendix D "Optional peripheral accessories" 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 when the switching frequency is 4 kHz, see section B.4.1 "EMC compatibility and motor cable length".
| Currently in environments in China, the VFD may generate radio interference, you need to take measures to reduce the interference. |
The anti-interference performance of the VFD meets the requirements of environments Category II in the IEC/EN 61800-3 standard.
The induction disturbance limit meets the following stipulations:
1. Select an optional EMC filter according to Appendix D "Optional peripheral accessories" 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 when the switching frequency is 4 kHz, see section B.4.1 "EMC compatibility and motor cable length".
| VFDs of C3 category cannot be applied to civilian low-voltage common grids. When applied to such grids, the VFD may generate radio frequency electromagnetic interference. |
