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Hitachi

Hitachi Industrial Equipment Systems Co., Ltd.

Inverter : Noise suppression equipment

Noise suppression equipment and applicable inverter

SJ-P1, WJ200, NE-S1
SJ-P1, WJ200, NE-S1
SJ-P1, WJ200, NE-S1
SJ-P1, WJ200, NE-S1
SJ-P1, WJ200, NE-S1
SJ-P1, WJ200, NE-S1
SJ-P1, WJ200, NE-S1

Noise suppression

Countermeasure and equipment against noise vary depending on type of noise, source of generation and size of obstacle. It is important to take appropriate countermeasure for each situation. Please refer to "Hitachi inverter technical guide book, chapter of noise"

Type and route of noise

Type and route of noise

Type of noise Propagation of noise Major phenomenon
Radiation noise Radiation noise in the air
(1) Direct radiation noise
(2) Radiation noise from power supply line
(3) Radiation noise from main cable
  • Noise toward Radio&TV
  • Mis-operated malfunction of measure equipment
  • The noise superimposes to the communications cable, and it malfunctions the monitor.
Conduction noise Spreads through signal line and power supply line.
(4) Conduction noise from power supply line
(5) Conduction noise from earth cable
  • Noise toward Radio&TV
  • Mis-operated malfunction of measure equipment
Inducement noise Spreads by electromagnetic induction and electrostatic induction
(6) Inducement noise from strong type of electrocity to weak type of electrocity current system
  • Noise superimposes to signal line and machine malfunctions

Noise suppression equipment and Effect

　 Function Radiation Conduction Inducement
Input
side		 Input side AC reacter　ALI △ △ △
Radio noise filter ZCL-□ ○ △ △
Radio noise filter (condenser filter)　CFI-□ ○ △ △
Input side noise filter(line filter)　NF-□□□ △ ○ ○
Output
side		 Output side AC reactor　ACL △ △ △
Radio noise filter　ZCL-A ○ △ △
Output side noise filter (line filter)　ACF-□□□ ○ ○ ○
Output side LCR Filter ○ ○ ○

○ : effective △ : less effective
Also, as noise suppression shield line for wiring separation of main circuit and control circuit is reqeured.

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