Hitachi L100 IP Series, Instruction Manual

Page: 24 / 94

Chapter 5 – Wiring
5-6
Part description Function
AC reactor
This part is used when the unbalance ratio is 3% or
more and the power supply is 500kVA or more, and
there are rapid changes in the power supply. This part
also improves the power factor.
EMI filter
( Note )
This part is used to conform with the applicable
EMC standards.
Radio noise filter
This part reduces noise generated at the output of the
inverter (this type of filter supplies an almost perfect
sine shaped output voltage between phase-phase and
phase-PE).
Motor filter
Motors that are driven by an inverter are to a larger
extent subject to voltage fluctuations than motors directly
driven (without inverter) by power lines. An AC reactor
installed between inverter output and motor smoothens
motor run and so reduces torque ripple. When the cable
between the inverter and the motor is too long, this part
also forces the voltage dv/dt to be limited and so protects
the isolation of the motor.
Note: Usage of an EMI filter is necessary for the European EMC
directive, for the Australian C-TICK and others. In comparison, the other
parts mentioned in the table above are not intended for this special use.
Terminals
In the table below the location and dimensions of the power terminals (terminals for power supply and
motor) are listed:
Location of power terminals Inverter model
Screw size
(Screwdriver type)
Cross section
of cable
Tightening
torque range
L N + V U F - W
All NF models
M3
(0.6x3.5mm)
0.5…6mm
2
(AWG 22...10)
0.5…1.0 Nm
L1 L3 L2 + V U F - W
All HF models
M3
(0.6x3.5mm)
0.5…6mm
2
(AWG 22..10)
0.5…1.0 Nm
View of grounding terminal
All
M4
(PH2)
Ring or fork type
cable terminal
diameter: 4mm
1.2…1.3 Nm
L1
(L1)
L2 L3
(N)
(T1)
U
(T2)
V
(T3)
W
Motor
Thermal
relays