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General Warnings and Cautions
CAUTION: EFFECTS OF DISTRIBUTOR LINES ON INVERTERS
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.
General Caution
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.
EMI filter Inverter
Power
source
Motor
U
V
W
U
V
W
L1(L1)
L2
L3(N)
R1
S1
T1
R2
S2
T2
Terminal
for
grounding
Power
source
EMI
filter
Noise
Inverter
Motor
Noise
Remote
operator
Piping
(to be grounded)
or shielded wire
Ground the
frame.
Completely ground the shield made
of metal screen, enclosed panel, etc.
with as short a wire as possible.
Technologies Inc.
Toll Free: voice: 1-877-539-2542 fax: 1-800-539-2542 www.mgitech.com