Themis RES-22XR3, Installation Manual

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1-7
Themis Computer
1—Overview and Specifications
System LEDs and I/O Connectors
Table 1-3. 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 left 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 right power
supply has failed or has
lost AC input.
And
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
system has been shut
down and there has been
no interruption 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 sup-
ply modules. When power
is restored but system is
still off, one of the two indi-
cator 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(s).