Chapter 3 Mechanical and Electrical Installation
-28-
Part Name
Mounting
Location
Function description
Circuit
breaker
Front end of
input circuit
Disconnect the power supply when the equipment at the
lower level 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 (Not more than twice
each minute) on the inverter or directly startup shall be
avoided.
AC input
reactor
Input side of the
inverter
˅ 1) 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
1˅ Reduce the external conduction and radiation
interference of the inverter.
2˅ Decrease the conduction interference flowing from
the power end to the inverter and improve the
anti-interference capacity of the inverter.
DC reactor
MD series
inverter adopts
DC reactor of
more than 7.5kW
as standard.
˅ 1) Improve the power factor of the input side;
˅ Improve the whole efficiency and thermal stability
of the inverter.
˅ 3) Eliminate the impact of higher harmonics on the
input side of 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
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:
1˅ Degrade the motor insulation performance and
damage the motor for the long run.
2˅ 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.
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