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Procedure 8-4 (continued)
High voltage shutdown adjustments for replacement rectifiers
Step
3
If the voltage reading on the
DVM is
> –56.0 V dc
< –56.0 V dc
= –56.0 V dc
4
5
6
7
8
AccessNode Modular Business Package VTBM Ring User Guide P0904244 Issue 1.0
Action
Verify the voltage reading on the DVM.
CAUTION
Risk of equipment damage
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
Risk of equipment damage
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 limit until HVSD occurs.
Note: The ON/RFA LED illuminates red and the rectifier shuts down.
Record the voltage measurement.
Turn the FLT potentiometer counterclockwise to reduce the voltage (about
two turns).
Reset the ac breaker to the ON position.
Watch the DVM readings and slowly adjust the FLT potentiometer clockwise
to increase the float voltage until either –56.0 V dc is reached or High Voltage
Shutdown (HVSD) occurs.
Note 1: If HVSD occurs, the ON/RFA LED illuminates red and the rectifier
shuts down. Record the voltage measurement.
Note 2: If the –56.0 V level cannot be reached, hold the FLT/EQL switch in
the EQL position while adjusting the FLT potentiometer.
—continued—
Testing the batteries and rectifiers 8-19
Then SLOWLY adjust the
FLT potentiometer
counterclockwise until the DVM reads –56.0 V dc
clockwise until the DVM reads –56.0 V dc
Go to step 4.
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