Verifying The Lvd Indicators - Nortel SONET AccessNode User Manual

9-10 Replacing the low-voltage disconnect unit
Procedure 9-3

Verifying the LVD indicators

Use this procedure to verify the operation of the LED indicators in the modular
business package (MBP) low-voltage disconnect (LVD) unit mounted in the
rear of the master cabinet.
The LEDs on the LVD unit (see Figure 9-5) indicate alarm and status
conditions for the rectifiers and the LVD. The LED indicator definitions and
causes are listed in the following table:
LED
RFA MIN
RFA MAJ
TEST BYP
Requirements
The rectifiers must be adjusted and verified and remain in the power-up
condition (all rectifier circuit breakers are ON).
Tools and materials
No tools and materials are required to perform this procedure.
Caution
AccessNode P0904244 Issue 1.0
Color Definition
Red Rectifier fail alarm—
minor
Red Rectifier fail alarm—
major
Red Test bypass
indication
DANGER
Risk of injury or damage
Read the warnings and precautions at the beginning of this
chapter to minimize any risk to personnel and equipment.
—continued—
Cause
There is a tripped circuit
breaker on one rectifier.
There are tripped circuit
breakers on more than
one rectifier.
The LVD bypass switch is
in the BYP position.