Enclosure Description
1.3 Power and Signal Distribution
1.3 Power and Signal Distribution
The power supply (30-35042-01) provides power to all the units in the
enclosure. It accepts alternating current (ac) input voltage in the ranges 110 V
ac to 120 V ac (88 V rms
1
to 132 V rms) and 220 V ac to 240 V ac (176 V rms
to 264 V rms).
The regulators in the power supply maintain the correct direct current (dc)
output voltages, which are independent of the fluctuations in the ac input
power. The power supply can provide a continuous power output of 166
watts (W). The power supply has two internal fans that cool the unit while it
operates. Table 1–2 gives the current specifications of the dc circuits.
Table 1–2 Power Supply dc Outputs
Voltage (dc)
Output Current Range in Amperes (dc)
Minimum
Maximum
+5.1
3.8
15.0
+12.1
0.18
7.1
-12.0
0.3
1.0
-9.0
0.0
0.2
+3.3
0.0
3.5
The power supply (30-35042-01) has the following output connectors:
• A flying lead connector that provides the dc power to the central processing
unit (CPU) module
• One connector on the side of the power supply that provides the dc power
to the devices on the upper drive-mounting shelf
• One connector on the side of the power supply that provides the dc power
to the devices on the lower drive-mounting shelf
Figure 1–5 shows the distribution of power in the BA42B Enclosure.
1
Root mean square.
Enclosure Description 1–9
