INVT Goodrive3000 GD3000-01-055G-12 Operation Manual page 232

Goodrive3000 series medium voltage inverters EMC installation guidelines
inverter use the same power or electrical connection, conduction interference may easily occur. For such
interference, you can adopt the following solutions: install the high-performance power filter of our
company at the power input side of the inverter; install the amorphous magnetic ring on the output motor
cable and coil 2~3 turns, in the case of severe conditions, you can install the output power filter; install
small amorphous magnetic ring on the signal cable and coil 2~3 turns; reduce the carrier frequency
appropriately. (Cautions: Too low carrier frequency will increase harmonic and motor noise.)
Radiation interference transmits interference via space and the interfered devices are generally
instruments with weak signals, such as sensors and signal controllers. When the interfered devices and
the inverter are in the same control cabinet or in a short distance, radiation interference and thus
malfunction may easily occur. In this case, we recommend the following solutions: Try not to put the
signal devices and the inverter in the same cabinet and keep the signal devices away from the
interference source; use shielded twisted pairs for the signal cables and ground the shielded layer 360
degrees reliably.
Near-field induction transmits interference via near-field inductive coupling among cables. Generally, the
power cable and the signal cable are too close. In this case, you can adopt the following solutions:
Arrange the signal cable and the power cable separately; keep the signal cable away from the power
cable; use the shielded cables and ground the shielded layer 360 degrees reliably.
The signal devices should be grounded separately. To avoid common ground interference, do not ground
the signal devices with the inverter together.
B.2.2 Harmonic interference
Harmonic interference transmits interference in two ways: interfere the motor through the output port and
thus influence the service life of the motor; interfere other devices through the power port. In this case,
you can be adopt the following solutions: Install the reactor at the output port of the inverter; install RC
absorber at the output port of the inverter; in the case of severe conditions, suggest installing the LC sine
filter at the output port; install the reactor at the input power port, for four-quadrant inverter, install the LC
sine filter at the input power port; increase the carrier frequency appropriately. (Cautions: Too high carrier
frequency will increase temperature rise, electromagnetic noise and leakage current.)
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