Hitachi J300U Series - Manual (Page 15)

1-9
CAUTION
EMI filter Inverter
Power
source
Motor
U
V
W
U
V
W
L1(L1)
L2(L2)
L3(L3) 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.
➤
➤
➤
(T1)
(T2)
(T3)
*
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.
(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 ( ), be sure to confirm the setting
value again.
*
When setting b contact to the reverse command ([REV] terminal), the inverter
state automatically. Do not set to b contact.
GENERAL CAUTION
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.