Quarterly Inspection - C&D Technologies TEL Series Installation And Operating Procedures

Step 17. Repeat the above steps on String B, String C, String D, String E, etc.
Parallel Connection of individual strings of batteries
C&D recommends each of the individual battery strings be cabled separately to a common junction
point or box. Each string should also contain a separate fuse or disconnect switch to facilitate
maintenance, see Figure 2 & 5. The parallel connections should be completed only when the charger
and load are not connected to the battery output circuit. The battery strings should not be ''daisy
chained'' in parallel.
Vl. Freshening Charge
When the batteries have been in storage or transit for an extended period, over 6 months or if OCV's
are below 12.48 volts or when the number of cells in series is greater than 24, it is recommended the
battery system be given a freshening charge at 2.4 volts average per cell for 24 hours. This will
assure higher initial performance and will reduce the time period required for the cells to achieve
proper voltage balance between the individual units. Normally freshening charges are only necessary at
installation.
Vll. Float Charging
Following the freshening charge (if necessary) the battery system should be placed on "float" charge
at between 2.25 v/c and 2.30 v/c average (approximately 13.5 to 13.8 volts/unit average for 12 volt
units at 77°F).
Vlll. Periodic Maintenance
These VRLA batteries are maintenance free with respect to the electrolyte. However, the charging
voltage, temperature, performance and connection resistances must be periodically monitored and any
necessary corrective actions taken if irregular values are observed to assure reliable standby power
when required.

Quarterly Inspection

•
Measure and record the system total float charging voltage at the battery terminals
•
Record the charger on charge output current and voltage
•
Record the ambient temperature and condition of ventilation equipment
•
Visually inspect the batteries and rack for; general appearance, cleanliness or any irregularity.
Semiannual Inspection
•
Repeat the quarterly checks
•
Record the on charge voltage of each unit
•
Optionally perform and record Ohmic checks for trending purposes
Yearly and Initial Inspection
•
Repeat the semiannual checks
•
Inspect all connections to ensure integrity.
Item
TEL12-105FS
TEL12-160FW
TEL12-160F
TEL12-180F
Bolt Size
¼-20 ¾ inch long
¼-20 ½ inch long
¼-20 ½ inch long
¼-20 ½ inch long
Table 1
6 of 12
Wrench Size
7/16 110 inch pounds
7/16 110 inch pounds
7/16 110 inch pounds
7/16 110 inch pounds
Initial Torque