FAQ: How are Yaskawa Servopacks (or Inverters) connected to a five wire 400VAC power source?
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Germany (and other European Countries) uses a five wire three phase 400VAC. Three wires are power, one is neutral, and one is ground.
The 5 wire system is used to get balanced 400 V phase to phase and 230V phase to neutral (400/1.732) so control voltage can be obtained without a control transformer. In this case, the feeder transformer is a wye configuration, while the 5th wire is the power system ground. Some plants ground the neutral, while others float it. In the case of Yaskawa inverters and servos: For normal use, we ignore the neutral and utilize the 3 power phases and earth ground (system ground). For CE, Yaskawa's smaller inverters (V7, J7, and small servos) require the main AC power supply to be wye configuration with the neutral grounded in order to limit voltage to 277V or less to ground. This is to meet voltage clearance (LVD) requirements for CE.
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not supersede it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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