Hitachi SJ7002 Series Instruction Manual page 11

x
Clearwater Tech - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.clrwtr.com - Email: info@clrwtr.com
CAUTION: Do not insert leading power factor capacitors or surge absorbers between the
output terminals of the inverter and motor.
Ground fault
interrupter
GFI
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 10 minutes after tuning OFF the power
supply before opening the cover.
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.
EMI filter
L1
R1
Power
L2
S1
source
L3
T1
noise
Completely ground the enclosed
panel, metal screen, etc. with as
short a wire as possible.
Inverter
R, S, T U, V, W
GND lug
Inverter
R U
R2
S2 S V
T2 T W
EMI filter Inverter
Remote
operator
Surge absorber
Motor
Leading power
factor capacitor
T1
T2
Motor
T3
Motor
Grounded frame
Conduit or shielded cable—
to be grounded