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System Overview 1-11
System Unit
The following subsections provide service-related information about the system
unit.
System Power Supply
The 500-W system power supply can operate from an AC power source of 90 to
265 VAC at 50 or 60 Hz. When the power-supply paralleling board is installed,
the power supplies are hot-pluggable. When the red LED on the power supply is
lit (except during power-up), it indicates that the power supply has failed (see
Figure 1-5). When the green LED is lit, it indicates that +5 VDC is on. The sys-
tem power supply provides the DC operating voltages and currents listed in
Table 1-1.
NOTE: The power supply produces DC voltages only under its loaded condi-
tion. Therefore, when you measure these voltages, the DC power connectors
must be connected to their corresponding power input connectors on the system
board or drives.
.
Table 1-1. DC Voltage Ranges
Voltage Range
Maximum Output
Current
1
+3.3 VDC +3.135 to +3.465 VDC 15.0 A
+5 VDC +4.90 to +5.25 VDC 50.0 A
+12 VDC +11.40 to +12.60 VDC 25.0 A
–12 VDC –10.80 to –13.20 VDC 0.3 A
–5 VDC –4.50 to –5.50 VDC 0.3 A
+5 VFP
2
+4.85 to +5.36 VDC 0.25 A
1
Maximum continuous DC output power shall not exceed 500 W.
2
VFP (volts flea power) — sometimes called “standby power. ”