Chapter 6 EMC (Electromagnetic Compatibility)
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AC input reactor.
6-3-2.Electromagnetic Interference and Installation Precautions
There are two kinds of electromagnetic interferences, one is the interference from
electromagnetic noise in the surrounding environment to the inverter, and the other is
the interference from the inverter to the surrounding equipments.
Installation Precautions:
1) The earth wires of the Inverter and other electric products ca shall be well
grounded;
2) The power cables of the inverter power input and output and the cable of weak
current signal (e.g. control line) shall not be arranged in parallel but in vertical if
possible.
3) It is recommended that the output power cables of the inverter shall use shield
cables or steel pipe shielded cables and that the shielding layer shall be grounded
reliably, the lead cables of the equipment suffering interferences shall use twisted-pair
shielded control cables, and the shielding layer shall be grounded reliably.
4) When the length of motor cable is longer than 100 meters, it needs to install
output filter or reactor.
6-3-3.Remedies for the interferences from the surrounding electromagnetic
equipments to the inverter:
Generally the electromagnetic interference on the inverter is generated by plenty of
relays, contactors and electromagnetic brakes installed near the inverter. When the
inverter has error action due to the interferences, the following measures is
recommended:
1) Install surge suppressor on the devices generating interference;
2) Install filter at the input end of the inverter,please refer to Section 6.3.6 for the
specific operations.
3) The lead cables of the control signal cable of the inverter and the detection line
shall use the shielded cable and the shielding layer shall be grounded reliably.
6-3-4.Remedies for the interferences from the inverter to the surrounding
electromagnetic equipments:
These noise interferences are classified into two types: one is the radiation
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