Sn1757 Bbub Installation Design - NEC Univerge sv8500 Manual

4. SN1757 BBUB Installation Design

SN1757 BBUB is a booster battery unit (hereinafter called BBU) that is used to light message waiting lamp.
This BBU is able to light 100 message waiting lamps by one unit. A maximum of two unit can be connected per
a system.
This BBU is unavailable for PIR-B/SPIR.
Note:
FG, -48VR(G), -48V connectors
-48VR
FG
<How to connect the BBU to the system>
REAR
Power receiving
terminal
-48V -48Vaux
AC-DC Power Unit
-48V (IN)
CHAPTER 3
-48VR
+80V
-48V
DC-DC Converter
on BBU
(Note 1) (Note 2)
VOL.1-177
INSTALLATION DESIGN
connected to +80V
on PIR1 ~ PIR3
FE
+80V (OUT)
-48VR(G)
-48V
AL1
AL2
+80V
+80VR(G)