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Circuit Pack Descriptions
Issue 3 June 2001
7-3
BBG8/BBG8B SYSCTL Circuit Pack Description 7
Purpose of Circuit 7
The BBG8/BBG8B SYSCTL circuit pack is the main system controller in the
system. Together, with its companion overhead controller (OHCTL), it has control
over all shelf functions and provides all user interfaces into the system. The
BBG8/BBG8B SYSCTL must be used with the BBG9 OHCTL.
BBG8/BBG8B SYSCTL Faceplate Controls and
Indicators 7
The BBG8/BBG8B SYSCTL circuit pack faceplate controls and indicators are
shown in Figure 7-1. The SYSCTL has a red FAULT LED and a 7-segment
numeric LED display, as well as the FE SEL and UPD/INIT pushbuttons on its
faceplate. The red FAULT LED lights on detection of a circuit pack failure.
Figure 7-1. BBG8/BBG8B SYSCTL Circuit Pack
&
RTN RTN
Diode
ORing
Current
Limiter
Fuse
Filtering
LED Control
Fault LED
(Red)
-48 V -48 V
DC/DC
GND
Converter
Relay
+5 V
&
RTN
-48 V (A)
-48 V (B)
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