TECO-Westinghouse PA7300 Series, Installation And Operation Manual

Page: 39 / 154

9.2.2 EMI SUPPRESSION ZERO CORE
• Model: JUNFOC046S - - - - - - -
• Code No.: 4H000D0250001
• According to the required power rating and wire size, select the matched ferrite core to suppress
the zero sequence EMI filter.
• The ferrite core can attenuate the frequency response at high frequency range (from 100KHz to
50MHz, as shown below). It should be able to attenuate the RFI from AC Drive to the outside world.
• The zero-sequence noise filter ferrite core can be installed either on the input side or on the output
side. The wire around the core for each phase should be wound by following the same convention
and one direction. The more winding turns, the better the attenuation effect. (Without saturation).
If the wire size is too large to be wound, all the wire can be grouped and go through these several
cores together in one direction.
• Frequency attenuation characteristics (10 windings case)
Example: EMI suppression zero core application example
Note: All the line wire of the U/T1, V/T2, W/T3 phases must pass through the same zero-phase
core in the same winding sense.
9-4
PA 7300 PART I: INSTALLATION MANUAL
10
1
-40
-30
-20
-10
0
Interference Frequency (kHz)
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2
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3
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PRGM
DIGITAL OPERATOR JNEP-31
DRIVE FWD REV REMOTE
DRIVE
EDIT
ENTER
RESET
FWD
REV
DSPL
JOG
RUN STOP