Hitachi J300U Series 10-2, Applied voltage Good example Time Megohm-meter, Bad example Time

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.

Applied voltage

Good example

(L1)	(L2)	(L3)	(RB)	(+)	(-)	(T1)	(T2)	(T3)
R	S	T	RB	P	N	U	V	W

Time

Megohm-meter

0.1 sec. or more 0.1 sec. or more

Bad example

Time

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.

10-2