Effects Of Distributor Lines On Inverters - Hitachi J300 Series Instruction Manual

EMI filter
Power
source

EFFECTS OF DISTRIBUTOR LINES ON INVERTERS

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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.
(A) The unbalance factor of the power supply is 3% or higher.
(B) The power supply capacity is at least 10 times greater than the inverter capacity
(and the power supply capacity, 500 kVA or more).
(C) Abrupt power supply changes are expected.
Examples:
(1) Several inverters are interconnected with a short bus.
(2) A thyristor converter and an inverter are interconnected with a short bus.
(3) An installed phase advance capacitor opens and closes.
In cases (A), (B) or (C), we recommend installing an AC reactor of 3% (in a voltage
drop at rated current) with respect to the supply voltage on the power supply side.
When occurring an EEPROM error (
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value again.
When setting b contact to the reverse command ([REV] terminal), the inverter
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state automatically. Do not set to b contact.
In all the illustrations in this manual, covers and safety devices are occasionally
removed to describe the details. When the product is operated, make sure that the
covers and safety devices are placed as they were specified originally and operate it
according to the instruction manual.
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
Inverter
L1(L1) U (T1)
R1 R2
S1 S2 L2(L2) V (T2)
T1 T2 L3(L3) W (T3)
GENERAL CAUTION
CAUTION
Power
Motor
U
source
V
W
EMI
Terminal
filter
for
grounding
), be sure to confirm the setting
1-9
Noise
Inverter
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.
Motor
Ground the
frame.