Hitachi WJ200-007MF Manual page 27

Pursuing the ideal compact inverter

Table of Contents

[About the use in highlands beyond l,000m above sea level]

When the standard inverter is used at a place beyond l,000m above sea level because it cool heating element with air, please be careful as follows, But please inquire for the highlands more

than 2,500m separately.

1 . Reduction of the inverter rating current

The density of air decreases by 1% whenever rising by 100m when the altitude exceeds 1,000m. For example, in the case of 2,000m above sea level, it is {2,000(m)- because it becomes

1,000(m)}/100(m)X{-1(%)}=-10(%), please use with 10(%) reduction (0.9 inverter rating electric current) of a rating current of the inverter.

2. Reduction of the breakdown voltage

When using inverter at a place beyond 1,000m, the breakdown voltage decreases as follows.

1,000m or less: 1.00 / 1,500m: 0.95 / 2,000m: 0.90 / 2,500m: 0.85

But please do not perform the withstand pressure test as mention of the instruction manual.

[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).

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

Installation of an AC reactor

on the input side

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

Note: Example calculation with V

Unbalance factor of voltage =

Using a private power generator

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) terminals (output).

Wiring connections

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

Electro-magnetic

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

contactor

When used with standard applicable output motors (standard three-phase squirrel-cage four-pole motors), the WJ200 Series does not need a

Wiring between

thermal relay for motor protection due to the internal electronic protective circuit. A thermal relay, however, should be used:

inverter and

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

motor

Thermal relay

• 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

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

Installing a circuit breaker

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

The wiring distance between the inverter and the remote operator panel should be 20 meters or less. When this distance is exceeded, use CVD-E (current-

Wiring distance

voltage converter) or RCD-E (remote control device). Shielded cable should be used on the wiring. 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).

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

Phase advance capacitor

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 10 years. (10 years is not the

guaranteed lifespan but rather, the expected design lifeplan.) 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.

JEMA standard is the 5 years at ambient temperature 40

Purpose Inverter" (JEMA))

Also, such moving parts as a cooling fan should be replaced. Maintenance inspection and parts replacement must be performed by only specified trained personnel.

Information in this brochure is subject to change without notice.

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

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

= 205V, V

Max. line voltage (min.) – Mean line voltage

− (V

+ V

(Incorrect connection will cause an immediate failure.)

thermal relay tends to turn off readily. In this case, provide an AC reactor on the output side or use a current sensor.

C used in 12 hours daily. (according to the "Instructions for Periodic Inspection of General-

= 201V, V

= 200V (V