Maintenance Of Parts; If You Install Replacement Inv At Site - Hitachi SJ100 SERIES Service Manual

7-3. Maintenance of Parts

(1) Maintenance of printed circuit board (I/O board)
Printed circuit boards are maintenance free under normal applications except ALARAM relay
(hardware). However, in case which maintenance and inspection are necessary, pay attention to
the prevention of damage caused by static electricity as shown below.
* Prevent damage caused by static electricity
MCU and LSI on the printed circuit board can be destroyed by static electricity. Therefore be
sure to ground work benches, soldering irons and yourself before start working on a printed
circuit board.
(2) Maintenance of DC bus capacitor and cooling fan
We recommend that DC bus capacitors and cooling fans to be regularly replaced every three years
taking their lives into account. Please note that their life span shorten when they are used in high
temperatures and heavy loads.
Ambient
temperature (deg)
40
30
20
10
0
-10
0 1

7-4. If you install replacement INV at site

If you install replacement units at site, please preset the parameter by the panel or copy unit.
If you used the previous I/O board to replacement unit, the parameters are not changed.
Because parameters are memorized in the EEPROM on the control board on J100 /J300 series, and if
we used the previous control board to replacement unit at site to minimize the time. In case of
L100,SJ100 series, EEPROM is on the ISPM, even we replaced I/O board, the parameter is still the
same.
Capacitor Life Curve
2 3 4 5 6
Capacitor life time (year)
12 hours a day
operation
7 8 9 10
7-4/E
When the inverter is installed in a cabinet,
ambient temperature is the temperature in
the cabinet.