Hitachi SJ700B manual Main power supply, High-frequency Noise and Leakage Current

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Installation location and operating environment

Avoid installation in areas of high temperature, excessive humidity, or where moisture can easily collect, as well as areas that are dusty, subject to corrosive gasses, mist of liquid for grinding, or salt. Install the inverter away from direct sunlight in a well-ventilated room that is free of vibration. The inverter can be operated in the ambient temperature range from -10 to 50˚C.(Carrier frequency and output current must be reduced in the range of 40 to 50˚C.)

Main power supply

In the following examples involving a general-purpose inverter, a large peak current flows on the main power supply side, and is able to destroy the converter module. Where such situations are foreseen or the connected equipment must be highly reliable, install an AC reactor between the power supply and the inverter. Also, where influence of indirect lightning strike is possible, install a lightning conductor.

 

(A) The unbalance factor of the power supply is 3% or higher. (Note)

 

(B) The power supply capacity is at least 10 times greater than the inverter capacity (the power supply capacity is 500 kVA or more).

 

(C) Abrupt power supply changes are expected.

 

 

 

Installation of an

Examples:

 

 

 

(1) Several inverters are interconnected with a short bus.

 

 

AC reactor on the

(2) A thyristor converter and an inverter are interconnected with a short bus.

input side

(3) An installed phase advance capacitor opens and closes.

 

 

 

In cases (A), (B) and (C), it is recommended to install an AC reactor on the main power supply side.

 

Note: Example calculation with VRS = 205V, VST = 201V, VTR = 200V

 

VRS : R-S line voltage, VST : S-T line voltage, VTR : T-R line voltage

 

Unbalance factor of voltage = Max. line voltage (min.) - Mean line voltage x100

 

 

Mean line voltage

 

 

 

=

VRS-(VRS+VST+VTR)/3

x100 =

205-202

x100 =1.5(%)

 

(VRS+VST+VTR)/3

202

 

 

 

 

 

 

Using a private power

An inverter run by a private power generator may overheat the generator or suffer from a deformed output voltage waveform of the

generator. Generally, the generator capacity should be five times that of the inverter (kVA) in a PWM control system, or six times

generator

greater in a PAM control system.

 

 

 

 

 

 

 

Notes on Peripheral Equipment Selection

 

 

(1) Be sure to connect main power wires with R(L1), S(L2), and T(L3) terminals (input) and motor wires to U(T1), V(T2), and W(T3)

Wiring connections

terminals (output). (Incorrect connection will cause an immediate failure.)

 

 

(2) Be sure to provide a grounding connection with the ground terminal (

 

).

 

 

 

 

 

 

 

Electromagnetic

When an electromagnetic contactor is installed between the inverter and the motor, do not perform on-off switching during running

 

contactor

operation.

Wiring

 

When used with standard applicable output motors (standard three-phase squirrel-cage four-pole motors), the NE-S1 Series does

 

not need a thermal relay for motor protection due to the internal electronic protective circuit. A thermal relay, however,

between

 

 

should be used:

inverter and

 

Thermal relay

• during continuous running outside a range of 30 to 60 Hz.

motor

• for motors exceeding the range of electronic thermal adjustment (rated current).

•when several motors are driven by the same inverter; install a thermal relay for each motor.

•The RC value of the thermal relay should be more than 1.1 times the rated current of the motor. Where the wiring length is 10 m or more, the thermal relay tends to turn off readily. In this case, provide an AC reactor on the output side or use a current sensor.

 

Install a circuit breaker on the main power input side to protect inverter wiring and ensure personal safety. Choose an inverter-

Installing a circuit breaker

compatible circuit breaker. The conventional type may malfunction due to harmonics from the inverter. For more information, consult

 

the circuit breaker manufacturer.

 

 

Wiring distance

The wiring distance between the inverter and the remote operator panel should be 20 meters or less. Shielded cable should be used

on thewiring. Beware of voltage drops on main circuit wires. (A large voltage drop reduces torque.)

 

 

 

Earth leakage relay

If the earth leakage relay (or earth leakage breaker) is used, it should have a sensitivity level of 15 mA or more (per inverter).

Phase advance capacitor

Do not use a capacitor for power factor improvement between the inverter and the motor because the high-frequency components

of the inverter output may overheat or damage the capacitor.

 

High-frequency Noise and Leakage Current

(1)High-frequency components are included in the input/output of the inverter main circuit, and they may cause interference in a transmitter, radio, or sensor if used near the inverter. The interference can be minimized by attaching noise filters (option) in the inverter circuitry.

(2)The switching action of an inverter causes an increase in leakage current. Be sure to ground the inverter and the motor.

Lifetime of Primary Parts

Because a DC bus capacitor deteriorates as it undergoes internal chemical reaction, it should normally be replaced every five years. Be aware, however, that its life expectancy is considerably shorter when the inverter is subjected to such adverse factors as high temperatures or heavy loads exceeding the rated current of the inverter. The approximate lifetime of the capacitor is as shown in the figure at the right when it is used 12 hours daily (according to the " Instructions for Periodic Inspection of General-Purpose Inverter " (JEMA).) Also, such moving parts as a cooling fan should be replaced. Maintenance inspection and parts replacement must beperformed by only specified trained personnel. Please plan to replace new INV depends on the load, ambient condition in advance.

(˚C)

 

SJ700

 

 

 

 

temperature

50

 

 

40

 

SJ700B

30

 

Ambient

 

 

2.5

5

10

Capacitor lifetime (years)

 

Precaution for Correct Usage

•Before use, be sure to read through the Instruction Manual to insure proper use of the inverter.

•Note that the inverter requires electrical wiring; a trained specialist should carry out the wiring.

•The inverter in this catalog is designed for general industrial applications. For special applications in fields such as aircraft, outer space, nuclear power, electrical power, transport vehicles, clinics, and underwater equipment, please consult with us in advance.

•For application in a facility where human life is involved or serious losses may occur, make sure to provide safety devices to avoid a serious accident.

•The inverter is intended for use with a three-phase AC motor. For use with a load other than this, please consult with us.

Information in this brochure is subject to change without notice.

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Contents For More Precise Control Frequency When inverter is one frame size larger than motorTorque Speed minFrequency Hz Meets EN61800-3 2nd-EnvironmentControl circuit terminals comparison table Basic mode Indication only Basic Parameter Chose BasicParameter Read write=650V, cable=100m EU RoHS compliant except solder in power modulePhase 400V class Standard SpecificationsPhase 200V class Rated capacity 400V Weight lbs900HFF IP00Input terminals SpecificationsGeneral Specifications Inches for reference only DimensionsUnit mminch ・SJ700-750, 900HFEF2, HFUF2, HFF2 ・SJ700B-900, 1100HFF Model DCL-H-185-H-R 305 DCL-H-220-H-R 395 315 SJ700-1850,2200HFE2Contents of a basic mode display.default Setting the output frequencyFunction List 15.00 10050.0 A296 A094A294 A095B031 B028B029 B030B134 OthersB132 B133C032 C030C031 C033C154 C149C151 C15025.0 100 Output268435455 Not available for SJ700B 1024 135.0Operator OperatorOperator, Cable Main Circuit Terminals TerminalsContact Terminal Symbol Specifications 11A Contacting Maximum RateAnalog Digital DigitalAnalog Run〈Status Display〉 〈How to access the details about the present fault〉Protective Functions Source type logic Connecting DiagramOperatingTo Sink type logicConnection with Input Terminals Connecting to PLC75mm2 Wire75mm2 200V ShieldedOutput frequency Hz Torque CharactoristicSJ700 Series / Maximum Torque with Short Time Rating SJ700B Series / Maximum Torque with Short Time RatingRating% Derating DataSJ700/SJ700B Series / Torque Under Continous Operation Therating%You can mount the SJ300 series into the SJ700 series Those with compatibilityOption boards Basic display mode/Data comparison function additionExternal frequency filter time const OI-L input start frequency enableThose with compatibility Option boards D007Scaled output frequency monitoringMemo Mechanism Characteristic of the motorTemperature increase Application to MotorsLifetime of Primary Parts Main power supplyPrecaution for Correct Usage High-frequency Noise and Leakage Current
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SJ700B, SJ700 specifications

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