Appendix A. EMC Standard Installation GuideVFD-ED
suitable current handling capability. An ideal magnetic material for large currents is compound
magnetic powder. It has a higher current handling capability and higher impedance compared to pure
metallic magnetic cores. It is therefore suitable to implement in a high frequency environment. The
impedance can also be enhanced by increasing the turn ratio.
Zero Phase Reactor Installation
There are two installation methods, depending on the size of the zero phase reactor and the motor
cable length.
1. Wind the motor cable through the middle of a zero-phase reactor four times. Place the reactor and
the AC Motor Drive as close to each other as possible.
2. Place all wires through the middle of four zero-phase reactors without winding.
U/T1
V/T2
W/T3
R/L1
S/L2
T/L3
Power
Supply
Zero Phase Reactor
MOTOR
Analog Input Signals
If the analog input signals are affected by noise from the AC motor drive, connect a capacitor and a
ferrite core as indicated in Figure A-26 below. Wind the wires around the core in same direction for 3
times or more.
C
AVI/ACI/AUI
A
CM
Ferrite core
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