Specifications

VFD‐G7 Series Frequency Inverter Operation ManualChapter 9 EMC
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9.3.1 Harmonic Influence
The power's high‐order harmonics will damage the drive. So in the area with poor power
quality,proposetoinstalltheACinputreactor.
9.3.2 EMI and Installation Notes
Two kinds of EMI: one is electromagnetic noise of the environment to interfere the drive;
theotherisinterferencegeneratedbydrivetointerferetheenvironment.
Note:A.Thedriveandotherelectricalequipmentsmustbeproperlyearthed.
B.Verticallywiringofthepowerinputandcontrolwireisbest.
C.
 Output wire is proposed to use shielded cable, or use steel pipe to shield the wire, the
shield must properly grounded, the interfered equipment should be shielded by
multi‐stranded,andtheshieldmustproperlygrounded;
D.Whenthelengthofthemotor’scableisover100m,theoutputfilter
orreactorshouldbe
installed.
9.3.3 Handle interference of the environment to interfere the drive
The reason of the drive’s electromagnetic influence for the environment is that there are
many relays, contractors and electrimagnetic braking in the near of the drive. When the
drivedoesmalfunctionforinterference,proposethefollowingsolution:
A.Installsurgeabsorbersinthecomponentwhichcangeneratinginterference；
B.Install
filterinthedriveinput,refertothe9.3.6tooperate.
C.The wire ofthe drive’s inputandthe detecting line should useshielded cable, and be
properlyearthed.
9.3.4 Handle interference generated by drive to interfere the environment
Therearetwokindofthepartnoise:oneistheradiationinterference,andtheotheroneis
the conducted interference of the drive. Two kinds interference make the around
equipments being induced by electrimagnetic or electrostatic. Then the devices have
malfunctions.For severaldifferent kindsof interference,refertothe
following methodsto
solve:
A. Generally the signals of instruments, receivers, sensors and other for measuring are
weak,iftheyareclosetothedriveorinthesamecabinetwithdrive,thedeviceswill