ARR Series Three Phase, Six Pulse SCR Charger
Installation
RS-420, Rev. 7
2-5
2.5.2
Preliminary Adjustments
All adjustments are factory set. The settings are indicated by the red card (pictured here) attached on the inside
front of the charger.
However, you may wish to change some of the following settings to fit your particular battery. (This chart,
shown below, shows the proper float and equalize voltages for the different battery types.
Proper Float & Equalize Voltages
Cell Voltages
Type
Float
Equalize
Lead Antimony
2.15
2.33
Lead Calcium
2.17-2.20
2.33
Not required
Nickel-Cadmium
1.43
1.55
Nickel-Iron
1.50-1.55
1.60-1.65
2.5.3
Float Voltage Adjustment
The float potentiometer controls the floating voltage of the charger when the toggle switch is in the “NORMAL”
or “FLOAT” positions.
NOTE: Both “FLOAT” and “EQUALIZE” Potentiometers are 10-turn devices.
The adjustment control (potentiometer) for float voltage is located on the front of your charger, marked FL. By
turning the potentiometer clockwise, you increase the float voltage. If you turn the potentiometer
counterclockwise, you decrease the float voltage.
In order to correctly adjust the float voltage the battery should be in a fully charged condition with some load
connected. While the unit is in operation, adjust the float potentiometer to float voltage desired.
(The voltage reading is indicated on the charger’s voltmeter.)
The float voltage will depend upon the type of battery, and the type of service for which the battery is used (e.g.
communications).
