Hitachi SJ700-2 instruction manual Applicable peripheral equipment, 100, Inverter Motor

Chapter 2 Installation and Wiring

(3) Applicable peripheral equipment

Power supply

Magnetic contactor

See Item (4), "Recommended cable gauges, wiring accessories, and crimp terminals."

Note 1: The peripheral equipment described here is applicable when the inverter connects a standard Hitachi 3-phase, 4-pole squirrel-cage motor.

Note 2: Select breakers that have proper capacity. (Use breakers that comply with inverters.)

Note 3: Use earth-leakage breakers (ELB) to ensure safety.

Note 4: Use copper electric wire (HIV cable) of which the maximum allowable temperature of the insulation is 75°C.

Note 5: If the power line exceeds 20 m, cable that is thicker than the specified applicable cable must be used for the power line.

Note 6: Use a 0.75 mm2 cable to connect the alarm output contact.

Note 7: Tighten each terminal screw with the specified tightening torque. Loose terminal screws may cause short circuits and fire.

Tightening a terminal screw with excessive torque may cause damage to the terminal block or inverter body.

Note 8: Select an earth-leakage breaker (ELB) of which the rated sensitivity current matches the total length of cables connected between the inverter and power supply and between the inverter and motor. Do not use a high-speed type ELB but use a delayed-type ELB because the high-speed type may malfunction.

Note 9: When a CV cable is used for wiring through a metal conduit, the average current leakage is 30 mA/km.

Note 10: When an IV cable, which has a high relative dielectric constant, is used, the leakage current is about eight times as high as the standard cable. Therefore, when using an IV cable, use the ELB of which the rated sensitivity current is eight times as high as that given in the table below. If the total cable length exceeds 100 m, use a CV cable.

Total cable length	Sensitivity current (mA)
100 m or less	50
300 m or less	100

Name

Reactor on input side (for harmonic control, power supply coordination, and power factor improvement) (ALI-XXX)

Noise filter for inverter (NF-XXX)

Radio noise filter (Zero-phase reactor) (ZCL-X)

Description

Use this reactor to control harmonic waves or when the imbalance of power supply voltage is 3% or more, when the power supply capacity is 500 kVA or more, or when the power voltage may change rapidly. This reactor also improves the power factor.

This noise filter reduces the conductive noise that is generated by the inverter and transmitted in cables. Connect this noise filter to the primary side (input side) of the inverter.

The inverter may generate radio noise through power supply wiring during operation. Use this noise filter to reduce the radio noise (radiant noise).

Inverter

Motor

Radio noise filter on input side	Use this noise filter to reduce the radiant noise radiated from
(Capacitor filter) (CFI-X)	input cables.
DC reactor (DCL-X-XX)	Use this reactor to control the harmonic waves generated by
	the inverter.
	Use these devices to increase the braking torque of the
Braking resistor	inverter for operation in which the inverter turns the connected
Regenerative braking unit	load on and off very frequently or decelerates the load running
	with a high moment of inertia.
	Connect this noise filter between the inverter and motor to
Noise filter on the output side	reduce the radiant noise radiated from cables for the purpose
	of reducing the electromagnetic interference with radio and
(ACF-CX)
	television reception and preventing malfunctions of measuring
	equipment and sensors.
Radio noise filter	Use this noise filter to reduce the noise generated on the
(Zero-phase reactor)	output side of the inverter. (This noise filter can be used on
(ZCL-XXX)	both the input and output sides.)
	Using the inverter to drive a general-purpose motor may cause
	larger vibrations of the motor when compared with driving it
AC reactor for the output side	directly with the commercial power supply. Connect this AC
	reactor between the inverter and motor to lessen the pulsation
For reducing vibrations and
	of motor. Also, connect this AC reactor between the inverter
preventing thermal relay
	and motor, when the cable length between them is long (10 m
malfunction
	or more), to prevent thermal relay malfunction due to the
(ACL-X-XX)
	harmonic waves that are generated by the switching operation
	on the inverter. Note that the thermal relay can be replaced
	with a current sensor to avoid the malfunction.
LCR filter	This filter converts the inverter output into a sinusoidal
	waveform.

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