Veichi AC90 Manual page 16

AC90 TENSION CONTROL FREQUENCY INVERTER MANUAL
Build noise filters at the output side to reduce radio interference and inductive disturbance. The noise filter must be
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as close to the inverter output terminal as possible. Meantime, the filter must earth reliably as the inverter.
Anytime, control circuit wire should be shielded cable.
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Add zero phase reactor in power supply wire near inverter input terminal and add zero phase reactor in the motor
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wire near inverter output terminal to reduce electromagnetic interference to the inverter efficiently.
Earthing Right and reliable earthing is the basic condition of safe and reliable running of the product. For right
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earthing, please read the following notice carefully.
Remark: motor must earth as close as possible. Motor case can not be connected to the inner earth terminal of the
inverter. It also can not share the earth net with the control system.
In order to avoid electric shock, earthing cable should be the size as electric
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equipment technic standard required and cable length should be as short as
possible. Otherwise, inverter leakage current will cause unstable potential of the
earthing terminal which is far from the earthing point, and electric shock accident will
happen frequently.
Earth terminal must be earthing. Earth resistance must be below 10Ω. Otherwise,
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there is danger of death.
Please do not share earth cable with welder or other big current/pulse power
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equipment. Otherwise, inverter will act abnormally.
While multi inverters are used at the same time, please do not wind the earth wire to
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loop-type. Otherwise, inverter will act abnormally.
Chart 3-4: multi AC90 series inverters united earthing
Chart 3-5：AC90 series inverter system earthing
BASIC OPERATION AND TRIAL RUN
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