1
Figure 73. LEDs on the power supply units of the control enclosure
Table 91. Power-supply unit LEDs
Power
AC
supply
Fan
failure
OK
failure
On
On
On
Off
Off
Off
Off
Off
Off
1
DC
failure
Status
On
Communication
failure between
the power
supply unit and
the enclosure
chassis
Off
No ac power to
the enclosure.
On
The ac power is
on but power
supply unit is
not seated
correctly in the
enclosure.
Chapter 5. Control enclosure
Action
Replace the power
supply unit. If failure is
still present, replace the
enclosure chassis.
Turn on power.
Seat the power supply
unit correctly in the
enclosure.
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