Dc Power Supplies; Checking The Power Status Leds - NEC Express 5800/140Rb-4 Service Manual

DC Power Supplies

The power supply bay accommodates up to three power supply modules. The bay contains a power
distribution board (PDB) that manages the delivery of power from the power supply modules.

Checking the Power Status LEDs

To view the power supply status LEDs (Figure 7), remove the bezel, as described on page 30.
A
B
Table 7 lists the LED states and the power supply status indicated by each state.
Table 7. LED Power Supply Status Indicators
Power LED State
On
Off
Standby LEDs State
On
Redundant AC LED State
On
Off
Power LEDs (PWR)
Standby LEDs (SB1 and SB2)
Figure 30. Power and Standby LEDs
Status
AC power is applied and the power module is functioning properly.
Module is disabled.
Module is overstressed.
Module replacement required.
Status
AC power is applied to corresponding power module, SB1 (left) or SB2
(right).
Status
Redundant (center) module is installed and power subsystem is operating in
redundant AC mode.
Power subsystem is not operating in redundant AC mode.
C Redundant AC LED (AC_R)