AC Present Indicator
— An orange indicator that lights when the
Power switch is set to on and voltage is present at the input of the
power supply. If the indicator does not light when the Power switch is
set to on, refer to your system
Troubleshooting and Diagnostics
manual.
DC OK Indicator
— A green indicator that lights when the power
supply voltages are within the correct operating range. If the indicator
does not light when the Power switch is set to on, refer to your system
Troubleshooting and Diagnostics
manual.
Fan Failure Indicator
— An amber indicator that lights if one of the
two cooling fans stops working. The power supply automatically shuts
down your system as a precautionary measure when a fan failure is
detected. Call your Digital service representative if a fan failure occurs.
Over Temperature Condition Indicator
— An amber indicator
that lights if your system shuts down due to an over temperature
condition. Section 2.9 provides instructions on recovering from an over
temperature condition.
Power Bus Connectors
— They let you configure a Power Bus for
systems expanded with the R400X or B400X expander. For a single-
system configuration with one or more expanders, the Power Bus lets
you turn power on and off through the power supply designated as the
main power supply. That way, one Power switch can control power for
an entire expanded system.
System Overview 1–17
