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12-22 Cabinet maintenance operations
Procedure 12-3 (continued)
Adjusting the high voltage shutdown for replacement rectifiers
Step
4
If the voltage reading on the
DVM is
> -56.0 V dc
< -56.0 V dc
= to -56.0 V dc
5
6
7
8
AccessNode 323-3001-210 Issue 1.0
Action
Verify the voltage reading on the DVM:
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.
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.
Record the voltage measurement.
Turn the FLT POT counterclockwise to reduce the voltage (about two turns).
Reset the ac breaker to the ON position.
—continued—
Then SLOWLY adjust the
FLT potentiometer
counterclockwise until the DVM reads
-56.0 V dc
(see CAUTION 2 on page 12-22).
Go to step 5.
clockwise until the DVM reads -56.0 V dc
(see CAUTION 2 on page 12-22).
Go to step 5.
go to step 11.
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