Hitachi L100 Instruction Manual page 15

xii
General Warnings and Cautions
General Caution
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Technologies Inc.
CAUTION: EFFECTS OF DISTRIBUTOR LINES ON INVERTERS
EMI filter Inverter
R1 R2 L1(L1)
Power S1 S2 L2
source T1 T2 L3(N)
In the cases below involving a general-purpose inverter, a large peak current flows on the
power supply side, sometimes destroying the converter module. Where such situations
are foreseen, or the paired equipment must be highly reliable, install an AC reactor
between the power supply and the inverter.
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 (and
the power supply capacity, 500 kVA or more).
3. Abrupt power supply changes are expected.
Some examples include:
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.
In cases (1), (2), and (3) we recommend installing an AC reactor of 3% (at a voltage
drop at rated current) with respect to the supply voltage on the power supply side.
CAUTION: When the EEPROM error E8 occurs, be sure to confirm the setting value
again.
CAUTION: When setting b contact to the forward or reverse command [FW], [RV]
terminal, the inverter starts automatically. Do not set to b contact without a purpose.
CAUTION: In all the illustrations in this manual, covers and safety devices are
occasionally removed to describe the details. While operating the product, make sure
that the covers and safety devices are placed as they were specified originally and
operate it according to the instruction manual.
Power
Motor
U U
source
V V
W W
EMI
Terminal
filter
for
grounding
Noise
Motor
Inverter
Ground the
frame.
Piping
Noise
(to be grounded)
or shielded wire
Completely ground the shield made
of metal screen, enclosed panel, etc.
with as short a wire as possible.