12-22 Cabinet maintenance operations
AccessNode 323-3001-210 Issue 1.0
Procedure 12-3 (continued)
Adjusting the high voltage shutdown for replacement rectifiers
Step Action
4 Verify the voltage reading on the DVM:
5 Slowly and slightly adjust the HVSD potentiometer by turning it
counterclockwise to decrease the HVSD level until HVSD occurs.
Note:
The ON/RFA LED illuminates red and the rectifier shuts down.
6 Record the voltage measurement.
7 Turn the FLT POT counterclockwise to reduce the voltage (about two turns).
8 Reset the ac breaker to the ON position.
—continued—
If the voltage reading on the
DVM is
Then SLOWLY adjust the
FLT potentiometer
> -56.0 V dc counterclockwise until the DVM reads
-56.0 V dc
(see CAUTION 2 on page 12-22).
Go to step 5.
< -56.0 V dc clockwise until the DVM reads -56.0 V dc
(see CAUTION 2 on page 12-22).
Go to step 5.
= to -56.0 V dc go to step 11.
CAUTION 2
Battery stabilization requirements
When increasing or decreasing the float voltage on a
working system with batteries connected, always proceed
very slowly. Only turn the float potentiometer 1/4 turn at any
one time then allow the batteries to stabilize before
adjusting the FLT potentiometer again. The batteries
require a period of time to stabilize to the new voltage and
current levels.
CAUTION 3
Overvoltage damage to equipment
Do NOT adjust the voltage above -56.0 V dc as damage to
the AccessNode equipment may result.
To Next Page
Loading...
