Silicon Graphics CHALLENGE L, User Manual, Page: 43 / 164

Power Supplies
27
Power Supplies
AC voltage feeds into a power receptacle and circuit breaker assembly
located on the lower left rear panel of the Challenge deskside system. The
circuit breaker switch controls the main power supply to the chassis and
provides alternating current (AC) circuit protection. The power receptacle
and circuit breaker are shown in Figure 2-8.
The Challenge deskside system is available as either a 110 VAC or 220–240
VAC system. Certain system configurations or upgrades may require the use
of a 220–240 VAC supply; check with your sales or service representative.
Voltage is routed into a special power supply known as an offline switcher
(OLS). The OLS supplies up to 1900 watts of power to the chassis backplanes
by converting the AC voltage to 48 VDC. The 48 VDC is converted by power
boards that plug into the backplanes and provide voltages needed by system
boards and devices.
Five VME slots are provided for the addition of third-party, special
application boards.
Note:
POWER Challenge systems using optional visualization console
graphics have only two VME slots available.
Sun
®
VME power pin (9U VME) conventions are supported. Silicon
Graphics supports the Sun convention for additional power and ground
pins on the P3 connector. VME option boards increase the chassis power
requirements. Check with an authorized service representative to confirm
that a new VME board fits within the power budget of the chassis.
Caution: It is the responsibility of the chassis owner to verify that a new
board meets VME specifications; otherwise, the board or chassis can be
damaged during installation. VME boards should be installed only by
qualified service personnel.
See Appendix E for additional VME related information.