Hitachi L100 Series User Manual page 11

CAUTION: Do not insert leading power factor capacitors or surge absorbers between
the output terminals of the inverter and motor.
Earth leakage
breaker
Power
Input
L1, L2, L3
CAUTION: Be sure to connect the grounding terminal to earth ground.
CAUTION: When inspecting the unit, be sure to wait five minutes after tuning off the
power supply before opening the cover.
CAUTION: MOTOR TERMINAL SURGE VOLTAGE SUPPRESSION FILTER
(For the 400 V CLASS)
In a system using an inverter with the voltage control PWM system, a voltage surge
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
motor terminals. A dedicated filter of the 400 V class for suppressing this voltage surge
is available. Be sure to install a filter in this situation.
CAUTION: SUPPRESSION FOR NOISE INTERFERENCE FROM INVERTER
The inverter uses many semiconductor switching elements such as transistors and
IGBTs. Thus, a radio receiver or measuring instrument located near the inverter is
susceptible to noise interference.
To protect the instruments from erroneous operation due to noise interference, they
should be used well away from the inverter. It is also effective to shield the whole
inverter structure.
The addition of an EMI filter on the input side of the inverter also reduces the effect of
noise from the commercial power line on external devices.
Note that the external dispersion of noise from the power line can be minimized by
connecting an EMI filter on the primary side of inverter.
Surge absorber
U, V, W
Inverter
GND lug
xi
L100 Inverter
Motor
Leading power
factor capacitor