MD280/MD280N User Manual EMC
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carrier frequency. However, reducing the carrier frequency may
result in addition of motor noise. Note that additional installation of
reactor is also an effective method to remove the leakage current.
2. The leakage current may increase following the addition of circuit
current. Therefore, when the motor power is high, the corresponding
leakage current will be high too.
2. Factors of producing leakage current between the cables and solutions:
There is distributed capacitance between the output cables of the
inverter. If the current passing the lines has higher harmonic, it may
cause resonance and thus result in leakage current. If thermal relay
is used, it may generate error action.
The solution is to reduce the carrier frequency or install output
reactor. It is recommended that thermal relay not be installed before
the motor when using the inverter, and that electronic over current
protection function of the inverter be used instead.
7.3.6 Precautions for Installing EMC input filter at the input end of
power supply
1ǃ When installing the EMC input filter at the input end of the power
supply, it is recommended to use the EMC filter produced by
Shanghai Eagtop Electronic Technology Co., Ltd.
2ǃ When using the inverter, please follow its rated values strictly.
Since the filter belongs to Classification I electric appliances, the
metal enclosure of the filter shall be large and the metal ground of
the installing cabinet shall be well earthed and have good
conduction continuity. Otherwise there may be danger of electric
shock and the EMC effect may be greatly affected.
3ǃ Through the EMC test, it is found that the filter ground must be
connected with the PE end of the inverter at the same public earth.
Otherwise the EMC effect may be greatly affected.
4ǃ The filter shall be installed at a place close to the input end of the
power supply as much as possible.
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