Themis RES-XR4-1U, Installation Manual

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1-7
Themis Computer
1—Overview and Specifications
Front Panel and System LEDs
Table 1-4. Power Supply LED Behavior
Symbol LED Power System LED Description
On
(red LED)
Power Fail LED
(Left Power Supply)
Note: system is powered on
 If system is powered on,
warns that the upper power
supply has failed or has lost
AC input.
On
(red LED)
Power Fail LED
(Right Power Supply)
Note: system is powered on
 If system is powered on,
warns that the lower power
supply has failed or has lost
AC input.
Off
Power Fail LED
(Left & Right Power supply)
Note: system is powered on
 System is powered on and
power supply modules are
functioning normally, or sys-
tem has been shut down
and there has been no inter-
ruption to the AC power.
Or
On
(red LED)
Power Fail LED
(Left or Right Power Supply)
a
Note: system is powered off
 AC power has been inter-
rupted to both power supply
modules. When power is re-
stored but system is still off,
one of the two indicator
lights will be lit.
Rear
Power Supply
Modules
On
(green
LED)
Green LED
(adjacent to AC input)
Note: system is powered on
 System is receiving DC
power (3.3V, 5V, 12V) from
the power supply module
Off
b
Green LED
(adjacent to AC input)
Note: system is powered off
 System is off and not re-
ceiving DC power from the
Power Supply module.
a—This LED behavior indicates only that AC power has interrupted to both power supplies, and does not indicate which
power supply module lost power first, or regained power first.
b—This LED behavior indicates that DC power is not being used, and the system is off. It does not indicate a loss of AC
power to the power supply module.