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General Warnings and Cautions 4
!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 mod-
ule:
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 ca-
pacity (or the power supply capacity is 500 kVA 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 transis-
tors 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 interfer-
ence, 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 mini-
mized by connecting an EMI filter on the primary side of the inverter.
!Caution When the EEPROM error E08 occurs, be sure to confirm the setting values
again.
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