Hitachi SJ300-037HFE 사용자 설명서

Component Descriptions

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Electrical noise interference may occur 
on nearby equipment such as a radio 
receiver. The zero-phase reactor helps 
reduce radiated noise from the inverter 
wiring. It can be used on the input or 
output side of the inverter. The example 
zero-phase reactor shown to the right 
comes with a mounting bracket. The 
wiring must go through the opening to 
reduce the RF component of the electri-
cal noise. Loop the wires three times 
(four turns) to attain the full RF filtering 
effect. For larger wire sizes, place 
multiple zero-phase reactors (up to 
four) side-by-side for a greater filtering 
effect.

The EMI filter reduces the conducted noise on the power supply wiring generated by the 
inverter. Connect the EMI filter to the inverter primary (input side). The NF–CEH–x series 
filter is required for compliance to the EMC Class A directive (Europe) and C-TICK (Austra-
lia). See 

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.

To meet EMC Class B limit an optional ferrite core (FC–Hx) must be inserted between the
NF–CEHx filter (above) and the inverter.

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 only 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 instruc-
tions.

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.