Inovance MD280NT2.2GB - Page 38

MD280 User Manual Mechanical and Electrical Installation
- 37 -
3.2.2 Description of Peripheral Electrical Devices
Table 3-2 Description of peripheral electrical devices
Part Installation Location Function Description
Molded
case circuit
breaker
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At the front end of
the input circuit
Interrupts the power supply when overcurrent occurs
on downstream devices.
Contactor
Between the MCCB
and the input side of
the AC drive
Starts and stops the AC drive.
Do not start or stop the AC drive frequently by switching
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use it to directly start the AC drive.
AC input
reactor
On the input side of
the AC drive
Improves the power factor on the input side.
Eliminates the high order harmonics on the input
side effectively and prevent other device from being
damaged due to distortion of the voltage waveform.
Eliminates the input current unbalance due to
unbalance between the power phases.
EMC input
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On the output side of
the AC drive
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interference of the AC drive.
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power supply side to the AC drive and improves the
anti-interference capacity of the AC drive.
DC reactor
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drive of 7.5G/11P or
above
Improves the power factor on the input side.
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drive.
Eliminates the impact of input side high order
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conduction and radiation interference.
AC output
reactor
Between the output
side of the AC drive
and the motor, close
to the AC drive
The output side of the AC drive generally has much
high order harmonics. When the motor is far from the
AC drive, there is much distributed capacitance in the
circuit and certain harmonics may cause resonance in
the circuit, bringing about the following two impacts:
Degrade the motor insulation performance and damage
the motor in the long run.
Generate large leakage current and cause frequent AC
drive trips.
If the distance between the AC drive and the motor is
greater than 100 m, install the AC output reactor.
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