Hitachi L100 Instruction Manual page 123

5–4
RF Noise Filters (Magnetic Choke)
EMI Filter
RF Noise Filter (Capacitive)
DC Link Choke
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Component Descriptions
Electrical noise interference may occur on
nearby equipment such as a radio receiver.
This magnetic choke filter helps reduce
radiated noise from the inverter wiring. It
can be used on the input or output side of
the inverter. The example magnetic choke
shown to the right comes with a mounting
bracket. The wiring must go through the
opening to reduce the RF component of
the electrical noise. Loop the wires three
times (four turns) to attain the full RF
filtering effect.
The EMI filter reduces the conducted noise on the power supply wiring generated by the
main power supply, protecting the inverter. Connect the EMI filter to the inverter primary
(input side). The FFL100 series filter is required for compliance to the EMC directive
(Europe) and C-TICK (Australia). The other filters are not for this purpose.
WARNING: The EMI filter has high internal leakage current from power wiring to the
chassis. Therefore, connect the chassis ground of the EMI filter before making the power
connections to avoid danger of shock or injury.
This capacitive filter reduces radiated noise from the main power wires in the inverter
input side. This filter is not for achieving CE compliance and is applicable to the input
side only of the inverter. It comes in two versions — for 200V class inverters or 400V
class inverters. Please refer to the documentation that comes with the radio noise filter
for installation instructions.
The DC choke (reactor) suppresses harmonics generated by the inverter. It attenuates the
high-frequency components on the inverter's internal DC bus (link). However, note that
it does not protect the diode rectifiers in the inverter input circuit.
ZCL–x
EMI–x