31
6. Charge the battery for 7 hours at 0.2*I
1
as shown in Appendix 2,
adjust the electrolyte level and read and file cells end of charge
voltages prior to the end of charge Requirement: ≥ 1.56 V.
Identify cells for replacement. Refer to Task 10.7.
7. Stand the battery for 1 hour.
8. Discharge the 24V battery at I
1
to 20V.
Requirement: The voltage of each cell after 48 minutes must be
equal / greater than 1 Volt.
Note: If the discharge at the I
1
rate is not feasible, select a different
rate and criteria from the table below.
Record the cell voltages at the corresponding time indicated in
column 2 in the log book.
Replace the cells underperforming the charge or/ and
discharge voltage requirements in accordance with
Task 10.7.
9. Record the data in the log book.
10. Record in the battery log book whether the battery has passed
or failed.
11. Continue in accordance with Task 7.2 step 14 or 7.3 at step 14 or
Task 10.1 step 13.
Discharge current rate Time (min) cell voltage
reading
Voltage requirement
for cells (V)
0.2*I
1
240 ≥1.0
0.4*I
1
120 ≥1.0
0.6*I
1
80 ≥1.0
0.8*I
1
60 ≥1.0
I
1
48 ≥1.0
Task 8.2 – Check and adjust the torque of the lower pole nuts
OPERATING INSTRUCTION AND TECHNICAL REQUIREMENTS (TR) INSTRUCTIONS / EVIDENCE WHEN DEVIATIONS FROM TR
ATTENTION
The torque of the lower pole nut shall be checked and adjusted only
at the annual maintenance.
Before adjustment, discharge the battery with 0.2*I
1
to 0.5 V per cell.
Identify cells for replacement. Refer to Task 10.7.
1. Undo and remove the upper pole nuts.
2. Remove the washers and intercell links.
3. Remove the thermostat assembly ( if any).
4. Tighten the lower pole nuts and check the torques with an
appropriated and calibrated torque wrench as indicated in the table
1 of section 1.6.2.
5. Refit the washers and intercell links.
6. Refit intercell links of thermostat assembly (if any).
7. Tighten the upper pole nuts and check the torques with an
appropriated and calibrated torque wrench as indicated in the table
1 of section 1.6.2.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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