Delta C2000 Series User Manual page 681

AC Motor Drives with Built-in Filter
1. Since interferences are suppressed by installing an earthed capacitor in the filter, the amount of
current to ground (leakage current) could result in electric shocks to personnel or the power system.
Please be aware of this problem.
2. Since the leakage current to ground can be high, it is crucial to implement protective earthing to
prevent electrical shocks.
Filter Installation (With and Without)
Zero Phase Reactor (Choke)
Interferences can also be suppressed by installing a zero phase reactor at the power supply side
and/or the AC Motor Drive's output, depending on where the interference is. Since currents are large at
the power input and the AC Motor Drive's output, please carefully select the magnetic core with 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 4 times. Place the reactor and the
AC Motor Drive as close to each other as possible.
Power
Supply
2. Place all wires through the middle of four zero-phase reactors without winding.
Power
Supply
Zero Phase Reactor
R/L1 U/T1
S/L2
V/T2
T/L3
W/T3
Zero Phase Reactor
R/L1 U/T1
S/L2 V/T2
T/L3
W/T3
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MOTOR
MOTOR