KE600 Inverter Mechanical and Electric Installation
27
The Inverter input / output (main circuit) contains harmonic components, it may interfere with inverter
accessories communications equipment. Therefore, please install anti-interference filter to minimize
interference.
The details of external devices and accessories selection refer to the manual of external devices.
3.2.3 Using instruction of the external electrical parts
Table 3-2 Using Instruction of the External Electrical Parts
Part Name
Installing Location
Function Description
Circuit breaker Front end of input circuit
Disconnect the power supply when the equipment at the
lower part is over current.
Contactor
Between the circuit
breaker and the inverter
input side
Connection and disconnection of inverter. Frequent
power-on and power-off operations on the inverter should
be avoided.
AC input reactor Input side of the inverter
Improve the power factor of the input side;
Eliminate the higher harmonics of the input side effectively
and prevent other equipment from damaging due to
distortion of voltage wave.
Eliminate the input current unbalance due to unbalance
between the power phases.
EMC input filter
Input side of the inverter
Reduce the external conduction and radiation interference
of the inverter.
Decrease the conduction interference flowing from the
power
end
to
the
inverter
and
improve
the
anti-interference capacity of the inverter.
DC reactor
DC reactor is optional for
inverters above 18.5kW
Improve the power factor of the input side;
Improve the whole efficiency and thermal stability of the
inverter.
Eliminate the impact of higher harmonics of the input side
on the inverter and reduce the external conduction and
radiation interference.
AC output reactor
Between
the
inverter
output side and the
motor,
close
to
the
inverter
Between the inverter output side and the motor. close to
the inverter
The inverter output side generally has higher harmonics.
When the motor is far from the inverter, since there are
many distributed capacitors in the circuit, certain
harmonics may cause resonance in the circuit and bring
about the following two impacts:
Degrade the motor insulation performance and damage
the motor for the long run.
Generate large leakage current and cause frequent
inverter protection.
In general, the distance between the inverter and the
motor exceeds 100 meters. Installation of output AC
reactor is recommended.
