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Chapter 4. Power supply 27
Note: Some adapters and hard disk drives draw more current than the rated
maximums. These adapters and drives can be installed in the system;
however, the power supply will shut down if the total power used exceeds
the maximum power that is available.
Output protection
The power supply protects against output overcurrent, overvoltage, and short
circuits. See the power supply specifications on the previous pages for details.
A short circuit that is placed on any dc output (between outputs or between an output
and a dc return) latches all dc outputs into a shutdown state, with no damage to the
power supply. If this shutdown state occurs, the power supply returns to normal
operation only after the fault has been removed and the power switch has been
turned off for at least one second.
If an overvoltage fault occurs (in the power supply), the power supply latches all dc
outputs into a shutdown state before any output exceeds 130% of the power supply
value.
Connector description
The power supply for PC 300GL and PC 300PL personal computers has four, 4-pin
connectors for internal devices. The total power used by the connectors must not
exceed the amount shown in “Component outputs” on page 26. For connector pin
assignments, see “Appendix A. Connector pin assignments,” on page 33.
+12.0 V dc 1500 mA at startup, 400 mA
when active
+5.0% to -5.0%
Table 16. Video port pin 9
Supply voltage Maximum current Tolerance
+5.0 V dc 1100 mA +5.0% to -5.0%
Table 15. Internal DASD
Supply voltage Maximum current Tolerance