Technical data

6-4
Chassis Operations
6
chassis backplane, which distributes power to the fans, mass
storage drives, and VME card cage.
❏ The input power LED (on the front of the power supply --
visible with the power supply bezel removed) indicates the
presence of -48Vdc or 115/230Vac input power (depending
on the type of power supply installed) at the power supply
inputs.
To verify that the +5Vdc/+12Vdc/-12Vdc operating voltages
are present when the power supply bezel is in place, check
the status LEDs on the front panel of the processor board. If
the input power LED is off with input power applied, the
power supply is defective.
❏ The overtemperature LED (on the front of the bezel --
designated with a thermometer symbol) indicates the
presence of excessive operating temperatures within the
power supply, the card cage (if an optional backplane
thermal sensor is installed), or the SCSI device storage
module (if installed).
Power On/Off Procedures
The following procedures are the recommended methods for
powering-on and -off the XR Chassis.
Recommended Power-On Procedure
1. Verify that all system modules, and associated data/control
cabling are properly configured and installed. If the system is
rack-mounted, also check that all required external cabling
(to non-rack-mounted equipment) is correctly installed.
!
Caution
The integrator is responsible for ensuring that current
loads to not exceed the power supply's limits. The
maximum current loads per VME slot should not exceed