Alpha Technologies Nickel Cadmium Clear Case - Technical Manual - Manual (Page 12)

NI-CD-CLEAR-CASE 12
3.3 Equalizing Charge
An equalizing charge restores battery capacity and efficiency. Conduct an equalizing charge
after initially filling the cell with electrolyte, renewing the electrolyte, when the cell voltages
become unbalanced, or once every six months if the battery has been in floating charge
mode, but not discharged.
Equalizing charge procedure after filling the cell with new electrolyte
Set the charging equipment to the “EQUALIZING” position.
After 24 hours, set the battery back to the float charge by setting the charging equipment
to the “FLOAT” position.
Equalizing charge procedure after discharge or voltage imbalance
Set the charging equipment to the “EQUALIZING” position.
After 8-10 hours, set the battery back to the float charge by setting the charging
equipment to the “FLOAT” position.
The proper voltage level (see Table 3-1) should be reached within a relatively short period.
If this level, or higher, is not reached at the end of the equalizing charge, re-adjust the
equalizing charge voltage or increase the charge time.
1.
2.
1.
2.
3.2 General Charge, continued
Cell voltage gradually rises as the charging continues. To maintain the charging current at the
specified rate, raise the rectifier’s output voltage using the manual output voltage regulator.
Taking measurements before and after charging and during discharge helps to track changes
and identify problems. Use forms like those in section 7.0 to record the results. Wait two
hours after charging before taking final measurements, to allow the electrolyte to cool
sufficiently.
NOTE:
After the first charge, it is possible the battery may be discharged significantly due to various tests involving
load. If this occurs, charge again using the 10 hour rate current for 1 hours before putting the battery into
service.
Cell Type Equalizing Charge Voltage (Vpc)
HDV 1.52–1.57
HDH 1.55–1.65
HDM 1.55–1.65
HDS 1.55–1.70
Table 3-1, Equalizing Charge Voltage