Alpha Technologies AlphaCell HP - Manual (Page 17)

17 745-680-C5-002, Rev. A
3.2 Quarterly Preventive Maintenance, continued
Procedure
1. Verify the power supply is in Float mode.
2. Use the DC Amp clamp to measure and record each individual battery string’s float current.
3. If the individual string float current is greater than 0.5 amps, replace the battery string. Measure
and record the individual battery conductance and voltage on the Site Visit Record.
4. If the string float current is less than 0.5 amps,
4.1 Disconnect the batteries from the system
4.2 Measure the battery conductance. If any reading is below the suspect level, refer to
Table 1,
page 20, for mhos values for battery models.
4.3 Measure the battery voltage. If any reading is less than 12.6V then replace all those batteries
in the string.
4.4 If any individual battery voltage varies more than 0.5V above or below the average for the
string then replace the string.
Example:
V1 = 13V, V2 = 13V, V3=14V
Average voltage = 13.3V
If V3 is greater than average by 0.5V, then the batteries should be replaced.
Batteries removed from the site should then be tested per Section 3.5,
"Battery Refurbishment Plan".
4.5 Log the site location, battery location, model, manufacturer date codes, voltage and
conductance readings for all batteries.
5. Record data on Battery Maintenance log.
6. Verify the spacing between the batteries from front to back is at least 1/2" or 13mm, and adjacent
batteries do not touch one another.
7. Ensure the enclosure is clean and free of debris.
8. Measure and record the top center battery's temperature. This is typically the warmest battery in
the string.
9. Visually inspect the batteries for:
Cleanliness
Terminal damage or evidence of heating or overheating
Container or cover damage
10. Check terminal posts for signs of corrosion. If corrosion is present, neutralize with a solution of
1 lb (454g) sodium bicarbonate (baking soda) to 1 gallon (3.8l) of water. Rinse and dry.
11. Verify terminal posts are coated with NO-Ox grease or a spray-on protectant. Reapply as
needed.
12. Retorque all the interunit connecting hardware to the values noted in Table 3 on page 27.