Hitachi J300 Series Instruction Manual page 13

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a Do not insert leading power factor capacitors or surge absorbers between the
output terminals ofthe inverter and the motor.
Surge absorber
(Lr)(L2Xh)
r )(T2)(-n)
Powd I-)
R . S . T
!upply
ing power facbr capacitor
o Be sure to ground the grounding terminal, @.
a When inspecting the unit, after turning the power supply off be sure to wait
unitl the CHARGE lamp b€side the control terminal is offbefor€ opening the
cover.
(lfthe lamp is lit or still flickering, then tlte intemal capacitor's rcsidual voltage is
still dangerous.)
. MOTOR TERMINAL SURGE VOLTAGE SUPPRESSION FILTER
(FOR THE 4OO V CLASS)
In a system using an invener ofthe voltage control PWM system, a surge voltage
caused by the cable constants such as the cable length (especially when the distance
between the motor and inverter is 10 m or more) and cabling method may occur at
the motoa terminal.
A dedicated filter ofthe 4O0 V class for suppressing this surge voltage is available,
Please order one.
. PROTECTION AGAINST NOISE INTERFERENCE FROM INI'ERTER
The inverter uses many semiconductor switching elements such as transistors and
IGBTS. Thus, a radio set or measuring instrument located near the inverter is
susceptible to noise interference.
To protect the instruments ftom enoneous operation due to noise interference, they
should be installed well apart from the inverter. lt is also effective to shield the
whole invener structure.
Addition of an EMI filter on the input side of the inverter also reduces the effect of
noise trom commercial power line on extemal devices.
Note that extemal dispersion ofnoise from the power line can be minimiz€d by
connecting an EMI filter on the primary side of inverter.