Chapter 1 Safety Instructions
1 - 9
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 NE-S1 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 NE-S1 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)
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