Hitachi J300U Series User Manual

Page 83

10-2

NOTE 1: If the inverter is used under high temperature and heavy load conditions, its operat-

ing life will be significantly reduced.

NOTE 2: If the inverter has been stored for three years or more, apply the following condi-

tions.

1) Apply 80% of the rated voltage of the capacitor for 1 hour at normal tempera-

ture.

2) Increase the voltage to 90% and apply it for 1 hour.
3) Apply the rated voltage for 5 hours.

NOTE 3: Precautions in handling printed-circuit boards.

When maintenance and inspection of printed-circuit boards is necessary, be sure to
follow the precautions below.

• Prevent damage caused by static electricity. The IGBT of the inverter module,

the MCUs and ICs on a printed-circuit board can be destroyed by static electric-
ity, so be sure to ground work benches, soldering irons, and yourself before
working on a printed-circuit board.

Conduct these tests by short-circuiting the terminals as shown below, and by following the
conditions described.

• In regard to insulation resistance tests, measure the terminals below and the grounding at

500 VDC, and make sure that 5 Megohms or greater is indicated.

• Do not perform the withstand voltage test. When it should be done,

in regard to withstand voltage tests, supply the terminals below and the grounding with
1500 VAC (200 V class), 2000 VAC (400 V class) for one minute, and make sure that
there are no abnormalities.

• Do not conduct insulation resistance tests and withstand voltage tests for terminals other

than those indicated below.

• Increase or decrease the applied voltage for the withstand voltage test slowly and turn the

equipment 0 V again.

Megohm-meter

Time

0.1 sec. or more 0.1 sec. or more

Applied
voltage

(L1)

(L2)

(L3)

(RB)

(+)

(-)

(T1)

(T2)

(T3)

Good example

Bad example