4535 612 10261 HD11 Service Manual Page 63
CSIP Level 1 Theory of Operation: Functional Description
System
Operating
Power
System power development and distribution is provided by the installation site source voltage,
the system power supply, the E-box Backplane Board and Signal Distribution Board power buses,
and the power interconnect cables. The PC has its own power supply, but it gets its AC source
voltage from the system power supply.
System Power Supply
The system power supply is a self-contained unit that accepts AC mains voltage inputs from 80
to 276 Vac (100 to 240 Vac, nominal) having a line frequency of 47 to 63 Hz (50 to 60 Hz, nomi-
nal) and produces the AC and DC voltages (Ta b l e 4- 1) that power the system components.
There is no On/Off switch on the system power supply. Power is applied whenever the system’s
(country-specific) power cord is connected to the AC mains voltage. Except for the (always
on)120-Vac source AC to the PC power supply, all power output is activated by a signal from the
PC. The system power supply activates when it receives the “awake” signal, generated by the PC.
Table 4-1 Power Supply Output Voltages
Voltage Use
Lv (selectable from
0.85 to 2.25 Vdc)
TR Boards, Signal Processor Board
+2.5 Vdc TR Boards, Signal Processor Board
+3.3 Vdc TR Boards, Motor Controller Board, Signal
Processor Board
+5 Vdc TR Boards, Motor Controller Board, Backplane
– 5 Vdc TR Boards, Signal Processor Board, Backplane
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