I. Mechanical Resonance

Cause: Vibration caused by mechanical resonance affects the control of the frequency converter, leading to unstable output current (torque). This can be mitigated by changing the output frequency to reduce fluctuations in output current (torque).

II. Excessive High-Order Harmonics in the Power Supply

Cause: High-order harmonics in the power supply are generated by the rectifier section of the frequency converter, affecting the generator and leading capacitors. The source, frequency range, and transmission path of high-order harmonics differ from noise and leakage current.

Solutions:

1. Install a reactor.

2. Do not connect capacitors used for power enhancement.

III. Noise Generated by the Frequency Converter

Cause: Because the frequency converter outputs intermittently at a high carrier frequency, it becomes a source of noise. This noise can cause malfunctions in surrounding equipment.

Solutions:

1. Avoid parallel or bundled wiring of the frequency converter's power lines (output/input lines) and signal lines; wiring should be distributed.

2. Use twisted-pair shielded cables for detector connections and control signal lines, with the shielding layer connected to the SD terminal.

3. Install surge suppressors on machines that generate a lot of noise to suppress noise generation, and install data line filters on signal lines.