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(*) Use AWG 16 wire for the alarm signal wire.
Classify the detective current of the earth leakage breaker depending on the total
distance between the inverter and the motor.
Detective current (mA)
100 m and less
300 m and less
600 m and less
30
100
200
NOTE 5:
NOTE 6:
length
When using CV wire and metal tube,
the leakage current is around 30 mA/km.
The leakage current becomes eight times
because IV wires have a high dielectric
constant. Therefore, use an one class
larger earth leakage breaker according
to the left table.
➤
➤
➤
➤
➤
➤
R
(L1)
Inverter
P
RB
Thermal
relay
Motor
IM
FunctionPart description
AC reactor for
improving
the power factor
(ALI- L)
(ALI- H)
This part is used when the unbalance voltage ratio is 3%
or more and power supply is 500 kVA or more, and there
is a rapid change in the power supply.
It also improves the power factor.
Radio noise filter
(Zero phase
reactor) (ZCL-A)
Using the inverter may cause noise on the peripheral
equipment through the power lines.
This part reduces noise.
EMI filter for
inverter
(FFJ300- )
This part reduces common noise generated between
the power supply and the ground, as well as normal noise.
Put it in the primary side of inverter.
Regenerative
resistor
(RB - )
This part is used for applications that needs to increase
the brake torque of the inverter or to frequently turn on
and off and to run high inertia load.
Radio noise filter
(Zero phase
reactor) (ZCL-A)
This part reduces noise generated at the output of
the inverter.
(It is possible to use for both input and output.)
AC reactor for
reducing vibration
(ACL-L- )
(ACL-H- )
Running motors with the inverter generates vibration
greater than that with commercial power supply.
This part installed between the inverter and motor reduces
torque ripple.
When the cable length between the inverter and motor is
long, a countermeasure for a malfunction of the termal
relay is taken.
S
(L2)
T
(L3)
(+)
(T1)
U
(T2)
V
(T3)
W
NOTE 1:
NOTE 2: Be sure to consider the capacity of the circuit breaker to be used.
NOTE 3: Be sure to use bigger wires for power lines if the distance exceeds 20m.
NOTE 4: Be sure to use an grounding wire same size of power line or similar.
The applicable equipment is for Hitachi standard four pole squirrel-cage motor