CAUTION

*Do not insert leading power factor capacitors or surge absorbers between the output terminals of the inverter and the motor.

Earth

leakageSurge absorber breaker

Power

(L1)(L2)(L3)

 

(T1)(T2)(T3)

 

R, S, T,

INV

U, V, W,

Motor

supply

 

 

 

 

 

 

Leading power factor capacitor

*Be sure to ground the grounding terminal, .

*When inspecting the unit, after turning the power supply off be sure to wait unitl the CHARGE lamp beside the control terminal is off before opening the cover.

(If the lamp is lit or still flickering, then the internal capacitor’s residual voltage is still dangerous.)

*MOTOR TERMINAL SURGE VOLTAGE SUPPRESSION FILTER (FOR THE 400 V CLASS)

In a system using an inverter of the voltage control PWM system, a surge voltage caused by the cable constants such as the cable length (especially when the distance between the motor and inverter is 10 m or more) and cabling method may occur at the motor terminal.

A dedicated filter of the 400 V class for suppressing this surge voltage is available, Please order one.

*PROTECTION AGAINST NOISE INTERFERENCE FROM INVERTER

The inverter uses many semiconductor switching elements such as transistors and IGBTs. Thus, a radio set or measuring instrument located near the inverter is susceptible to noise interference.

To protect the instruments from erroneous operation due to noise interference, they should be installed well apart from the inverter. It is also effective to shield the whole inverter structure.

Addition of an EMI filter on the input side of the inverter also reduces the effect of noise from commercial power line on external devices.

Note that external dispersion of noise from the power line can be minimized by connecting an EMI filter on the primary side of inverter.

1-8

Page 14
Image 14
Hitachi J300U Series Earth LeakageSurge absorber breaker Power, Motor, Supply Leading power factor capacitor