Technical Documentation

DC Power Supply LEDs in an EX8200 Switch

A DC power supply has four LEDs on its faceplate: FAIL, OUT OK, A IN OK, and B IN OK LEDs. The text A or B next to the OK IN LEDs indicates which input lug the LED corresponds to. All four LEDs display information about the status of the power supply. See Figure 1.

Note: EX8208 switches support 2000 W DC power supplies.

EX8216 switches support 3000 W DC power supplies.

Figure 1: DC Power Supply LEDs in an EX8200 Switch

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Figure 1 describes the LEDs on a DC power supply in EX8200 switches.

Table 1: DC Power Supply LEDs in EX8200 Switches

LED

State

Description

A IN OK

Unlit

Indicates one of the following:

  • Power supply is disconnected from DC power feed.
  • DC power input voltage is not within normal operating range (-40 VDC through -72 VDC).
  • No DC power input.

Green
  • DC power input voltage is within normal operating range (–40 VDC through –72 VDC).

Yellow
  • DC input is present on the terminals but either the fuse is tripped or the ORing diode is open.

Red
  • DC power input voltage is reversed in polarity.

Note: The DC power supply is protected against reverse polarity input for both DC input feeds.

B IN OK

Unlit

Indicates one of the following:

  • Power supply is disconnected from DC power feed.
  • DC power input voltage is not within normal operating range (-40 VDC through -72 VDC).
  • No DC power input.

Green
  • DC power input voltage is within the normal operating range (–40 VDC through –72 VDC).

Yellow
  • DC input is present on the terminals but either the fuse is tripped or the ORing diode is open.

Red
  • DC power input voltage is reversed in polarity.

Note: The DC power supply is protected against reverse polarity input for both DC input feeds.

OUT OK

Unlit

Indicates one of the following:

  • DC output voltage is not within normal operating range.
  • Power supply is not supplying DC power correctly.

Green
  • DC power output is within normal operating range.

Yellow
  • Power supply has been disabled internally by the system.

FAIL

Unlit
  • Power supply is functioning normally.

Yellow
  • On steadily—Power supply has failed.
  • Blinking—Demand for output power exceeds the supply.

Note: If the IN OK LED and the OUT OK LED are unlit, the power cords are not installed properly or the power supply has failed.

If the IN OK LED is lit green and the OUT OK LED is unlit, the power supply is not installed properly or the power supply has an internal failure.

If the FAIL LED is lit, the power supply has failed and must be replaced. If the FAIL LED is blinking, add a power supply to balance the power demand and supply.

Published: 2009-10-08