Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
6 - 22 Testing
Issue 10 July 2000
Adjust
Rectifiers to
Float Voltage
Float voltage is the optimum voltage level at which a battery string gives
maximum life and full capacity. This voltage depends on the type and
number of batteries in a plant.
Float voltage per cell x number of cells = battery string float voltage
The float voltage for flooded lead-acid batteries such as the Round Cell
is 2.17 volts per cell. For a 24-cell configuration of Round Cells, string
voltage is
2.17 x 24 = 52.08 volts
To adjust rectifiers to the pre-determined float voltage, the rectifiers
must be on line with plant cables connected and REG fuses installed in
the plant controller or a remote bay.
Individually
The fastest way to adjust a group of rectifiers to float voltage is to adjust
them individually, turning each one off after adjustment, and turning
them all on after the last adjustment. In order to use this method,
however, the load requirement at the time of the adjustments must be
less than the capacity of the smallest rectifier.
1. Measure the battery voltage by holding the meter selector switch
in the Plt V position.
2. If the battery voltage is not the predetermined float voltage or the
desired battery float voltage, perform the following:
– If the voltage is too high, turn the Float Adj potentiometer
counterclockwise.
– If the voltage is too low, turn the Float Adj potentiometer
clockwise.
– Check the battery voltage and re-adjust the Float Adj
potentiometer until the battery voltage is within the required
tolerance of the desired float voltage.
3. Turn the rectifier off and repeat this procedure for each rectifier in
the group.
4. Turn all rectifiers on after the last rectifier is adjusted.
