W A RN IN G! W hen the internal fuse of th e UPS is dam aged, it m ust be replaced with fuse of the
same electric param eters by qualified personnel.
IM PO R T A N T ! Besid e the com m unication b oard is a static sensitive area, an ESD-p roof action is
critical before contacting w ith this area.
W A RN IN G! The user m ust select an appropriate M C C B to p rotect against short circuit an d
overload for the battery. It is recom m ended to adopt Vertiv B C B to provide a better solution.
N O T E: T he U PS m eets the standard requirem ent of short tim e w ith stand current of 10 kA w hen
external up stream distribution is eq uipped with adequate capacity of fuses/circuit breaker for fault
clearance. The specified upstream fuses are required to obtain the conditional short circu it current
rating , Icc at 65 kA sym m etrical rm s. It is recom m ended to select the fuses in com p liance w ith
voltage of 690 V, current of 800 A and breaking of 200 kA . T he specified upstream breakers should
com ply w ith an IE C 60 269 series standard.
N O T E: B ypass SCR is only protected against short circuit when adequate capacity of fuses/circuit
breaker are present in the upstream distribution.
1 Important Safety Instructions
4
Vertiv™ Liebert® EXM2 UPS User Manual
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