Instruction Manual Inverter X200 Series

CAUTION: EFFECTS OF POWER DISTRIBUTION SYSTEM ON INVERTER

In the case below involving a general-purpose inverter, a large peak current can flow on the

power supply side, sometimes destroying the converter module:

1. The unbalance factor of the power supply is 3% or higher.

2. the power supply capacity is at least 10 times greater than the inverter capacity (or the

power supply capacity is 500kVA or more).

3. Abrupt power supply changes are expected, due to conditions such as:

a. Several inverters are interconnected with a short bus.

b. A thyristor converter and an inverter are interconnected with a short bus.

c. An installed phase advance capacitor opens and closes.

Where these conditions exist or when the connected equipment must be highly reliable, you

MUST install an input side AC-reactor of 3% (at a voltage drop at rated current) with respect to

the supply voltage on the power supply side. Also, where the effects of an indirect lightening

strike are possible, install a lightening conductor.

CAUTION: SUPPRESSION FOR NOISE INTERFERENCE FROM INVERTER

The inverter uses many semiconductor switching elements such as transistors and IGBTs. Thus,

a radio receiver or measuring instrument located near the inverter is susceptible to noise

interference.

To protect the instruments from erroneous operation due to noise interference, they should be

used well away from the inverter. It is also effective to shield the whole inverter structure.

The addition of an EMI filter on the input side of the inverter also reduces the effect of noise from

the commercial power line on external devices.

Note that the external dispersion of noise from the power line can be minimized by connecting an

EMI filter on the primary side of the inverter.

 SFEF model has integrated filter complies to EN61800-3 category C1.

 HFEF model has integrated filter complies to EN61800-3 category C2.

EMI Filter

Motor

EMI Filter Inverter

Remote

Operator

Completely ground the

enclosure panel, metal

screen, etc. with as short

a wire as possible.

noise

Grounded frame

Conduit or shielded cable

-- to be grounded

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