Powerware 9155 UPS20-30kVA - Manual (Page 15)

1 UPS 20-30 kVA, 230 V 0/60 Hz output
User’s Guide
1026743
Revision B
Maintenance bypass switch
The maintenance bypass switch (MBS) shall be mounted in the bottom of the UPS cabinet. It
can be ordered factory installed.
External battery cabinet option
It’s recommended to install external battery cabinet(s) next to the UPS unit. The external battery
can be placed on either side of the UPS unit, but it is recommended to instal on left hand side.
Check before the installation that the battery voltage values in the type plate of the UPS and
external battery cabinets are the same. The cables are delivered with the external battery cabinet.
Warning!
The UPS contains high DC voltages. A qualified person must do the connections
between the UPS and the external battery cabinet(s). The battery cabinet is
connected electrically in parallel with the internal batteries of the UPS.
Warning!
If available, the internal battery has to be disconnected first because the external
battery terminals may be hazardous due to parallel battery strings.
Battery racks
External battery racks shall be sized to take the voltage drop in the cable into account. To obtain
support and help contact the local office or agent authorised by the manufacturer.