Maintenance-Object Repair Procedures
555-233-143
8-398 Issue 1 May 2002
Uninterruptible Power Supply
An external UPS provides a longer backup time than holdover batteries and can
replace the batteries and battery charger. The unit connects from the AC power
source to a cabinet’s AC power cord. If AC power fails, the unit supplies its own
AC power to the cabinet.
J58890CH-1
In AC-powered cabinets, the power-distribution unit (J58890CH-1), distributes
170 to 264 VAC from a wall outlet to a set of BU3200A Battery Interface Units
(BIU). See Figure 8-18 and Figure 8-19 on page 8-399.
Figure 8-18. AC Power-Distribution Unit (J58890CH-1) — Front
Circuit
reakers
Rectifier
Modules
Ring
Generator
Ring Generator
Fuse
Battery
Interface
Unit
j58890ch RBP 071596
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