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Hitachi EMC Recommendations
WARNING: This equipment should be installed, adjusted, and serviced by qualified
personal familiar with construction and operation of the equipment and the hazards
involved. Failure to observe this precaution could result in bodily injury.
Use the following checklist to ensure the inverter is within proper operating ranges and
conditions.
1. The power supply to WJ200 inverters must meet these specifications:
• Voltage fluctuation ±10% or less
• Voltage imbalance ±3% or less
• Frequency variation ±4% or less
• Voltage distortion THD = 10% or less
2. Installation measure:
• Use a filter designed for WJ200 inverter. Refer to the instruction of the applicable
external EMC filter.
3. Wiring:
• Shielded wire (screened cable) is required for motor wiring, and the length must be
20 meter or less.
• If the motor cable length exceeds the value shown above, use output choke to
avoid unexpected problem due to the leakage current from the motor cable.
• The carrier frequency setting must be 2 kHz to satisfy EMC requirements.
• Separate the power input and motor wiring from the signal/process circuit wiring.
4. Environmental conditions—when using a filter, follow these guidelines:
• Ambient temperature: –10 to 50 °C (Derating is required when the ambient
temperature exceeds 40 °C)
• Humidity: 20 to 90% RH (non-condensing)
• Vibration: 5.9 m/sec2 (0.6 G) 10 ~ 55Hz
• Location: 1000 meters or less altitude, indoors (no corrosive gas or dust)