Inovance MD330H - Page 26

MD380 User Manual Product Information
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2.4.1 Description of Peripheral Electrical Devices
Table 2-3 Description of peripheral electrical devices
Part Mounting Location Function Description
MCCB Power receiving side
Interrupt the power supply when overcurrent occurs on
downstream devices
Contactor
Between MCCB and
AC drive input side
Start and stop the AC drive.
Do not start and stop the AC drive frequently by switching
the contactor on and off (less than twice per minute) nor
use it to directly start the AC drive.
AC input
reactor
AC drive input side
• Improve the power factor of the input side.
• Eliminate the higher harmonics of the input side
effectively and prevents other devices from being
damaged due to distortion of the voltage waveform.
• Eliminate the input current unbalance due to unbalance
between the power phases.
EMC
Input lter
AC drive input side
• Reduce the external conduction and radiation
interference of the AC drive.
• Decrease the conduction interference owing from
the power end to the AC drive and improve the anti-
interference capacity of the AC drive.
DC
reactor
MD series AC drive
of 7.5G and above
congured with DC
reactor as standard
• Improve the power factor of the input side.
• Improve the efciency and thermal stability of the AC drive.
• Eliminate the impact of higher harmonics of the AC
drive input side and reduce the external conduction
and radiation interference.
AC output
reactor
Between AC drive
output side and the
motor, close to the
AC drive
The output side of the AC drive generally has much
higher 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 protection trips.
If the distance between the AC drive and the motor is
greater than 100 m, install an AC output reactor.
1) Do not install the capacitor or surge suppressor on the output side of the AC drive.
Otherwise, it may cause faults to the AC drive or damage to the capacitor and surge
suppressor.
2) Inputs/Outputs (main circuit) of the AC drive contain harmonics, which may interfere with
the communication device connected to the AC drive. Therefore, install an anti-interference
lter to minimize the interference.
3) For more details on peripheral devices, refer to related selection manual.