AEC IST5 Series, Service Manual

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Avoid short circuiting batteries. Short circuit the batteries can damage you
and your environment!
Battery terminal may rise up to 450 Vdc!
1. Switch “CB4”breaker OFF on UPS.
2. If there is breaker on battery cabinet, Switch it “OFF” .
3. Remove the fuse on battery cabinet.
4. Remove battery fuse on UPS.
5. Make sure of serial and parallel connections of external battery packs are correct.
6. Connect the cable to terminals of two neutral "N (battery neutral)" , one "+Battery" and one "-
Battery" respectively.
7. Connect four cables that come from UPS to terminals on battery cabinet or in battery room
according to external battery connection diagram below. As follows:

N(UPS)

-----

Positive Battery Group "-" terminal

N(UPS)

-----

Negative Battery Group "+" terminal

“+ BATTERY”

-----

Positive Battery Group “+“ Terminal

“ -BATTERY”

-----

Negative Battery Group "-" Terminal
8. Make sure that the polarities are connected correctly by checking battery connections for the
last time.
9. Replace battery fuse on UPS.
10. Replace battery fuse on battery cabinet.